<pre>Internet Engineering Task Force (IETF)                          M. Jones
Request for Comments: 7517                                     Microsoft
Category: Standards Track                                       May 2015
ISSN: 2070-1721


                           <span class="h1">JSON Web Key (JWK)</span>

Abstract

   A JSON Web Key (JWK) is a JavaScript Object Notation (JSON) data
   structure that represents a cryptographic key.  This specification
   also defines a JWK Set JSON data structure that represents a set of
   JWKs.  Cryptographic algorithms and identifiers for use with this
   specification are described in the separate JSON Web Algorithms (JWA)
   specification and IANA registries established by that specification.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in <a href="./rfc5741#section-2">Section&nbsp;2 of RFC 5741</a>.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   <a href="http://www.rfc-editor.org/info/rfc7517">http://www.rfc-editor.org/info/rfc7517</a>.

Copyright Notice

   Copyright (c) 2015 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to <a href="https://www.rfc-editor.org/bcp/bcp78">BCP 78</a> and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (<a href="http://trustee.ietf.org/license-info">http://trustee.ietf.org/license-info</a>) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.






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Table of Contents

   <a href="#section-1">1</a>.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   <a href="#page-3">3</a>
     <a href="#section-1.1">1.1</a>.  Notational Conventions  . . . . . . . . . . . . . . . . .   <a href="#page-3">3</a>
   <a href="#section-2">2</a>.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   <a href="#page-4">4</a>
   <a href="#section-3">3</a>.  Example JWK . . . . . . . . . . . . . . . . . . . . . . . . .   <a href="#page-5">5</a>
   <a href="#section-4">4</a>.  JSON Web Key (JWK) Format . . . . . . . . . . . . . . . . . .   <a href="#page-5">5</a>
     <a href="#section-4.1">4.1</a>.  "kty" (Key Type) Parameter  . . . . . . . . . . . . . . .   <a href="#page-6">6</a>
     <a href="#section-4.2">4.2</a>.  "use" (Public Key Use) Parameter  . . . . . . . . . . . .   <a href="#page-6">6</a>
     <a href="#section-4.3">4.3</a>.  "key_ops" (Key Operations) Parameter  . . . . . . . . . .   <a href="#page-7">7</a>
     <a href="#section-4.4">4.4</a>.  "alg" (Algorithm) Parameter . . . . . . . . . . . . . . .   <a href="#page-8">8</a>
     <a href="#section-4.5">4.5</a>.  "kid" (Key ID) Parameter  . . . . . . . . . . . . . . . .   <a href="#page-8">8</a>
     <a href="#section-4.6">4.6</a>.  "x5u" (X.509 URL) Parameter . . . . . . . . . . . . . . .   <a href="#page-8">8</a>
     <a href="#section-4.7">4.7</a>.  "x5c" (X.509 Certificate Chain) Parameter . . . . . . . .   <a href="#page-9">9</a>
     <a href="#section-4.8">4.8</a>.  "x5t" (X.509 Certificate SHA-1 Thumbprint) Parameter  . .   <a href="#page-9">9</a>
     4.9.  "x5t#S256" (X.509 Certificate SHA-256 Thumbprint)
           Parameter . . . . . . . . . . . . . . . . . . . . . . . .  <a href="#page-10">10</a>
   <a href="#section-5">5</a>.  JWK Set Format  . . . . . . . . . . . . . . . . . . . . . . .  <a href="#page-10">10</a>
     <a href="#section-5.1">5.1</a>.  "keys" Parameter  . . . . . . . . . . . . . . . . . . . .  <a href="#page-10">10</a>
   <a href="#section-6">6</a>.  String Comparison Rules . . . . . . . . . . . . . . . . . . .  <a href="#page-11">11</a>
   <a href="#section-7">7</a>.  Encrypted JWK and Encrypted JWK Set Formats . . . . . . . . .  <a href="#page-11">11</a>
   <a href="#section-8">8</a>.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  <a href="#page-11">11</a>
     <a href="#section-8.1">8.1</a>.  JSON Web Key Parameters Registry  . . . . . . . . . . . .  <a href="#page-12">12</a>
       <a href="#section-8.1.1">8.1.1</a>.  Registration Template . . . . . . . . . . . . . . . .  <a href="#page-12">12</a>
       <a href="#section-8.1.2">8.1.2</a>.  Initial Registry Contents . . . . . . . . . . . . . .  <a href="#page-13">13</a>
     <a href="#section-8.2">8.2</a>.  JSON Web Key Use Registry . . . . . . . . . . . . . . . .  <a href="#page-15">15</a>
       <a href="#section-8.2.1">8.2.1</a>.  Registration Template . . . . . . . . . . . . . . . .  <a href="#page-15">15</a>
       <a href="#section-8.2.2">8.2.2</a>.  Initial Registry Contents . . . . . . . . . . . . . .  <a href="#page-15">15</a>
     <a href="#section-8.3">8.3</a>.  JSON Web Key Operations Registry  . . . . . . . . . . . .  <a href="#page-16">16</a>
       <a href="#section-8.3.1">8.3.1</a>.  Registration Template . . . . . . . . . . . . . . . .  <a href="#page-16">16</a>
       <a href="#section-8.3.2">8.3.2</a>.  Initial Registry Contents . . . . . . . . . . . . . .  <a href="#page-16">16</a>
     <a href="#section-8.4">8.4</a>.  JSON Web Key Set Parameters Registry  . . . . . . . . . .  <a href="#page-17">17</a>
       <a href="#section-8.4.1">8.4.1</a>.  Registration Template . . . . . . . . . . . . . . . .  <a href="#page-17">17</a>
       <a href="#section-8.4.2">8.4.2</a>.  Initial Registry Contents . . . . . . . . . . . . . .  <a href="#page-18">18</a>
     <a href="#section-8.5">8.5</a>.  Media Type Registration . . . . . . . . . . . . . . . . .  <a href="#page-18">18</a>
       <a href="#section-8.5.1">8.5.1</a>.  Registry Contents . . . . . . . . . . . . . . . . . .  <a href="#page-18">18</a>
   <a href="#section-9">9</a>.  Security Considerations . . . . . . . . . . . . . . . . . . .  <a href="#page-19">19</a>
     <a href="#section-9.1">9.1</a>.  Key Provenance and Trust  . . . . . . . . . . . . . . . .  <a href="#page-20">20</a>
     <a href="#section-9.2">9.2</a>.  Preventing Disclosure of Non-public Key Information . . .  <a href="#page-20">20</a>
     <a href="#section-9.3">9.3</a>.  RSA Private Key Representations and Blinding  . . . . . .  <a href="#page-21">21</a>
     <a href="#section-9.4">9.4</a>.  Key Entropy and Random Values . . . . . . . . . . . . . .  <a href="#page-21">21</a>
   <a href="#section-10">10</a>. References  . . . . . . . . . . . . . . . . . . . . . . . . .  <a href="#page-21">21</a>
     <a href="#section-10.1">10.1</a>.  Normative References . . . . . . . . . . . . . . . . . .  <a href="#page-21">21</a>
     <a href="#section-10.2">10.2</a>.  Informative References . . . . . . . . . . . . . . . . .  <a href="#page-23">23</a>
   <a href="#appendix-A">Appendix A</a>.  Example JSON Web Key Sets  . . . . . . . . . . . . .  <a href="#page-25">25</a>
     <a href="#appendix-A.1">A.1</a>.  Example Public Keys . . . . . . . . . . . . . . . . . . .  <a href="#page-25">25</a>
     <a href="#appendix-A.2">A.2</a>.  Example Private Keys  . . . . . . . . . . . . . . . . . .  <a href="#page-25">25</a>
     <a href="#appendix-A.3">A.3</a>.  Example Symmetric Keys  . . . . . . . . . . . . . . . . .  <a href="#page-27">27</a>



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   <a href="#appendix-B">Appendix B</a>.  Example Use of "x5c" (X.509 Certificate Chain)
                Parameter  . . . . . . . . . . . . . . . . . . . . .  <a href="#page-28">28</a>
   <a href="#appendix-C">Appendix C</a>.  Example Encrypted RSA Private Key  . . . . . . . . .  <a href="#page-28">28</a>
     <a href="#appendix-C.1">C.1</a>.  Plaintext RSA Private Key . . . . . . . . . . . . . . . .  <a href="#page-29">29</a>
     <a href="#appendix-C.2">C.2</a>.  JOSE Header . . . . . . . . . . . . . . . . . . . . . . .  <a href="#page-32">32</a>
     <a href="#appendix-C.3">C.3</a>.  Content Encryption Key (CEK)  . . . . . . . . . . . . . .  <a href="#page-32">32</a>
     <a href="#appendix-C.4">C.4</a>.  Key Derivation  . . . . . . . . . . . . . . . . . . . . .  <a href="#page-33">33</a>
     <a href="#appendix-C.5">C.5</a>.  Key Encryption  . . . . . . . . . . . . . . . . . . . . .  <a href="#page-33">33</a>
     <a href="#appendix-C.6">C.6</a>.  Initialization Vector . . . . . . . . . . . . . . . . . .  <a href="#page-33">33</a>
     <a href="#appendix-C.7">C.7</a>.  Additional Authenticated Data . . . . . . . . . . . . . .  <a href="#page-34">34</a>
     <a href="#appendix-C.8">C.8</a>.  Content Encryption  . . . . . . . . . . . . . . . . . . .  <a href="#page-34">34</a>
     <a href="#appendix-C.9">C.9</a>.  Complete Representation . . . . . . . . . . . . . . . . .  <a href="#page-38">38</a>
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .  <a href="#page-40">40</a>
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  <a href="#page-40">40</a>

<span class="h2"><a class="selflink" id="section-1" href="#section-1">1</a>.  Introduction</span>

   A JSON Web Key (JWK) is a JavaScript Object Notation (JSON) [<a href="./rfc7159" title="&quot;The JavaScript Object Notation (JSON) Data Interchange Format&quot;">RFC7159</a>]
   data structure that represents a cryptographic key.  This
   specification also defines a JWK Set JSON data structure that
   represents a set of JWKs.  Cryptographic algorithms and identifiers
   for use with this specification are described in the separate JSON
   Web Algorithms (JWA) [<a href="#ref-JWA" title="&quot;JSON Web Algorithms (JWA)&quot;">JWA</a>] specification and IANA registries
   established by that specification.

   Goals for this specification do not include representing new kinds of
   certificate chains, representing new kinds of certified keys, or
   replacing X.509 certificates.

   JWKs and JWK Sets are used in the JSON Web Signature [<a href="#ref-JWS" title="&quot;JSON Web Signature (JWS)&quot;">JWS</a>] and JSON
   Web Encryption [<a href="#ref-JWE" title="&quot;JSON Web Encryption (JWE)&quot;">JWE</a>] specifications.

   Names defined by this specification are short because a core goal is
   for the resulting representations to be compact.

<span class="h3"><a class="selflink" id="section-1.1" href="#section-1.1">1.1</a>.  Notational Conventions</span>

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in
   "Key words for use in RFCs to Indicate Requirement Levels" [<a href="./rfc2119" title="&quot;Key words for use in RFCs to Indicate Requirement Levels&quot;">RFC2119</a>].
   The interpretation should only be applied when the terms appear in
   all capital letters.

   BASE64URL(OCTETS) denotes the base64url encoding of OCTETS, per
   Section 2 of [<a href="#ref-JWS" title="&quot;JSON Web Signature (JWS)&quot;">JWS</a>].





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   UTF8(STRING) denotes the octets of the UTF-8 [<a href="./rfc3629" title="&quot;UTF-8, a transformation format of ISO 10646&quot;">RFC3629</a>] representation
   of STRING, where STRING is a sequence of zero or more Unicode
   [<a href="#ref-UNICODE" title="&quot;The Unicode Standard&quot;">UNICODE</a>] characters.

   ASCII(STRING) denotes the octets of the ASCII [<a href="./rfc20" title="&quot;ASCII format for Network Interchange&quot;">RFC20</a>] representation
   of STRING, where STRING is a sequence of zero or more ASCII
   characters.

   The concatenation of two values A and B is denoted as A || B.

<span class="h2"><a class="selflink" id="section-2" href="#section-2">2</a>.  Terminology</span>

   The terms "JSON Web Signature (JWS)", "Base64url Encoding",
   "Collision-Resistant Name", "Header Parameter", and "JOSE Header" are
   defined by the JWS specification [<a href="#ref-JWS" title="&quot;JSON Web Signature (JWS)&quot;">JWS</a>].

   The terms "JSON Web Encryption (JWE)", "Additional Authenticated Data
   (AAD)", "JWE Authentication Tag", "JWE Ciphertext", "JWE Compact
   Serialization", "JWE Encrypted Key", "JWE Initialization Vector", and
   "JWE Protected Header" are defined by the JWE specification [<a href="#ref-JWE" title="&quot;JSON Web Encryption (JWE)&quot;">JWE</a>].

   The terms "Ciphertext", "Digital Signature", "Message Authentication
   Code (MAC)", and "Plaintext" are defined by the "Internet Security
   Glossary, Version 2" [<a href="./rfc4949" title="&quot;Internet Security Glossary, Version 2&quot;">RFC4949</a>].

   These terms are defined by this specification:

   JSON Web Key (JWK)
      A JSON object that represents a cryptographic key.  The members of
      the object represent properties of the key, including its value.

   JWK Set
      A JSON object that represents a set of JWKs.  The JSON object MUST
      have a "keys" member, which is an array of JWKs.

















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<span class="h2"><a class="selflink" id="section-3" href="#section-3">3</a>.  Example JWK</span>

   This section provides an example of a JWK.  The following example JWK
   declares that the key is an Elliptic Curve [<a href="#ref-DSS" title="&quot;Digital Signature Standard (DSS)&quot;">DSS</a>] key, it is used with
   the P-256 Elliptic Curve, and its x and y coordinates are the
   base64url-encoded values shown.  A key identifier is also provided
   for the key.

     {"kty":"EC",
      "crv":"P-256",
      "x":"f83OJ3D2xF1Bg8vub9tLe1gHMzV76e8Tus9uPHvRVEU",
      "y":"x_FEzRu9m36HLN_tue659LNpXW6pCyStikYjKIWI5a0",
      "kid":"Public key used in JWS spec <a href="#appendix-A.3">Appendix A.3</a> example"
     }

   Additional example JWK values can be found in <a href="#appendix-A">Appendix A</a>.

<span class="h2"><a class="selflink" id="section-4" href="#section-4">4</a>.  JSON Web Key (JWK) Format</span>

   A JWK is a JSON object that represents a cryptographic key.  The
   members of the object represent properties of the key, including its
   value.  This JSON object MAY contain whitespace and/or line breaks
   before or after any JSON values or structural characters, in
   accordance with <a href="./rfc7159#section-2">Section&nbsp;2 of RFC 7159</a> [<a href="./rfc7159" title="&quot;The JavaScript Object Notation (JSON) Data Interchange Format&quot;">RFC7159</a>].  This document
   defines the key parameters that are not algorithm specific and, thus,
   common to many keys.

   In addition to the common parameters, each JWK will have members that
   are key type specific.  These members represent the parameters of the
   key.  <a href="#section-6">Section 6</a> of the JSON Web Algorithms (JWA) [<a href="#ref-JWA" title="&quot;JSON Web Algorithms (JWA)&quot;">JWA</a>] specification
   defines multiple kinds of cryptographic keys and their associated
   members.

   The member names within a JWK MUST be unique; JWK parsers MUST either
   reject JWKs with duplicate member names or use a JSON parser that
   returns only the lexically last duplicate member name, as specified
   in <a href="#section-15.12">Section 15.12</a> (The JSON Object) of ECMAScript 5.1 [<a href="#ref-ECMAScript">ECMAScript</a>].

   Additional members can be present in the JWK; if not understood by
   implementations encountering them, they MUST be ignored.  Member
   names used for representing key parameters for different keys types
   need not be distinct.  Any new member name should either be
   registered in the IANA "JSON Web Key Parameters" registry established
   by <a href="#section-8.1">Section 8.1</a> or be a value that contains a Collision-Resistant
   Name.






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<span class="h3"><a class="selflink" id="section-4.1" href="#section-4.1">4.1</a>.  "kty" (Key Type) Parameter</span>

   The "kty" (key type) parameter identifies the cryptographic algorithm
   family used with the key, such as "RSA" or "EC".  "kty" values should
   either be registered in the IANA "JSON Web Key Types" registry
   established by [<a href="#ref-JWA" title="&quot;JSON Web Algorithms (JWA)&quot;">JWA</a>] or be a value that contains a Collision-
   Resistant Name.  The "kty" value is a case-sensitive string.  This
   member MUST be present in a JWK.

   A list of defined "kty" values can be found in the IANA "JSON Web Key
   Types" registry established by [<a href="#ref-JWA" title="&quot;JSON Web Algorithms (JWA)&quot;">JWA</a>]; the initial contents of this
   registry are the values defined in Section 6.1 of [<a href="#ref-JWA" title="&quot;JSON Web Algorithms (JWA)&quot;">JWA</a>].

   The key type definitions include specification of the members to be
   used for those key types.  Members used with specific "kty" values
   can be found in the IANA "JSON Web Key Parameters" registry
   established by <a href="#section-8.1">Section 8.1</a>.

<span class="h3"><a class="selflink" id="section-4.2" href="#section-4.2">4.2</a>.  "use" (Public Key Use) Parameter</span>

   The "use" (public key use) parameter identifies the intended use of
   the public key.  The "use" parameter is employed to indicate whether
   a public key is used for encrypting data or verifying the signature
   on data.

   Values defined by this specification are:

   o  "sig" (signature)
   o  "enc" (encryption)

   Other values MAY be used.  The "use" value is a case-sensitive
   string.  Use of the "use" member is OPTIONAL, unless the application
   requires its presence.

   When a key is used to wrap another key and a public key use
   designation for the first key is desired, the "enc" (encryption) key
   use value is used, since key wrapping is a kind of encryption.  The
   "enc" value is also to be used for public keys used for key agreement
   operations.

   Additional "use" (public key use) values can be registered in the
   IANA "JSON Web Key Use" registry established by <a href="#section-8.2">Section 8.2</a>.
   Registering any extension values used is highly recommended when this
   specification is used in open environments, in which multiple
   organizations need to have a common understanding of any extensions
   used.  However, unregistered extension values can be used in closed
   environments, in which the producing and consuming organization will
   always be the same.



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<span class="h3"><a class="selflink" id="section-4.3" href="#section-4.3">4.3</a>.  "key_ops" (Key Operations) Parameter</span>

   The "key_ops" (key operations) parameter identifies the operation(s)
   for which the key is intended to be used.  The "key_ops" parameter is
   intended for use cases in which public, private, or symmetric keys
   may be present.

   Its value is an array of key operation values.  Values defined by
   this specification are:

   o  "sign" (compute digital signature or MAC)
   o  "verify" (verify digital signature or MAC)
   o  "encrypt" (encrypt content)
   o  "decrypt" (decrypt content and validate decryption, if applicable)
   o  "wrapKey" (encrypt key)
   o  "unwrapKey" (decrypt key and validate decryption, if applicable)
   o  "deriveKey" (derive key)
   o  "deriveBits" (derive bits not to be used as a key)

   (Note that the "key_ops" values intentionally match the "KeyUsage"
   values defined in the Web Cryptography API
   [<a href="#ref-W3C.CR-WebCryptoAPI-20141211">W3C.CR-WebCryptoAPI-20141211</a>] specification.)

   Other values MAY be used.  The key operation values are case-
   sensitive strings.  Duplicate key operation values MUST NOT be
   present in the array.  Use of the "key_ops" member is OPTIONAL,
   unless the application requires its presence.

   Multiple unrelated key operations SHOULD NOT be specified for a key
   because of the potential vulnerabilities associated with using the
   same key with multiple algorithms.  Thus, the combinations "sign"
   with "verify", "encrypt" with "decrypt", and "wrapKey" with
   "unwrapKey" are permitted, but other combinations SHOULD NOT be used.

   Additional "key_ops" (key operations) values can be registered in the
   IANA "JSON Web Key Operations" registry established by <a href="#section-8.3">Section 8.3</a>.
   The same considerations about registering extension values apply to
   the "key_ops" member as do for the "use" member.

   The "use" and "key_ops" JWK members SHOULD NOT be used together;
   however, if both are used, the information they convey MUST be
   consistent.  Applications should specify which of these members they
   use, if either is to be used by the application.








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<span class="h3"><a class="selflink" id="section-4.4" href="#section-4.4">4.4</a>.  "alg" (Algorithm) Parameter</span>

   The "alg" (algorithm) parameter identifies the algorithm intended for
   use with the key.  The values used should either be registered in the
   IANA "JSON Web Signature and Encryption Algorithms" registry
   established by [<a href="#ref-JWA" title="&quot;JSON Web Algorithms (JWA)&quot;">JWA</a>] or be a value that contains a Collision-
   Resistant Name.  The "alg" value is a case-sensitive ASCII string.
   Use of this member is OPTIONAL.

<span class="h3"><a class="selflink" id="section-4.5" href="#section-4.5">4.5</a>.  "kid" (Key ID) Parameter</span>

   The "kid" (key ID) parameter is used to match a specific key.  This
   is used, for instance, to choose among a set of keys within a JWK Set
   during key rollover.  The structure of the "kid" value is
   unspecified.  When "kid" values are used within a JWK Set, different
   keys within the JWK Set SHOULD use distinct "kid" values.  (One
   example in which different keys might use the same "kid" value is if
   they have different "kty" (key type) values but are considered to be
   equivalent alternatives by the application using them.)  The "kid"
   value is a case-sensitive string.  Use of this member is OPTIONAL.
   When used with JWS or JWE, the "kid" value is used to match a JWS or
   JWE "kid" Header Parameter value.

<span class="h3"><a class="selflink" id="section-4.6" href="#section-4.6">4.6</a>.  "x5u" (X.509 URL) Parameter</span>

   The "x5u" (X.509 URL) parameter is a URI [<a href="./rfc3986" title="&quot;Uniform Resource Identifier (URI): Generic Syntax&quot;">RFC3986</a>] that refers to a
   resource for an X.509 public key certificate or certificate chain
   [<a href="./rfc5280" title="&quot;Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) Profile&quot;">RFC5280</a>].  The identified resource MUST provide a representation of
   the certificate or certificate chain that conforms to <a href="./rfc5280">RFC 5280</a>
   [<a href="./rfc5280" title="&quot;Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) Profile&quot;">RFC5280</a>] in PEM-encoded form, with each certificate delimited as
   specified in <a href="./rfc4945#section-6.1">Section&nbsp;6.1 of RFC 4945</a> [<a href="./rfc4945" title="&quot;The Internet IP Security PKI Profile of IKEv1/ISAKMP, IKEv2, and PKIX&quot;">RFC4945</a>].  The key in the first
   certificate MUST match the public key represented by other members of
   the JWK.  The protocol used to acquire the resource MUST provide
   integrity protection; an HTTP GET request to retrieve the certificate
   MUST use TLS [<a href="./rfc2818" title="&quot;HTTP Over TLS&quot;">RFC2818</a>] [<a href="./rfc5246" title="&quot;The Transport Layer Security (TLS) Protocol Version 1.2&quot;">RFC5246</a>]; the identity of the server MUST be
   validated, as per <a href="./rfc6125#section-6">Section&nbsp;6 of RFC 6125</a> [<a href="./rfc6125" title="&quot;Representation and Verification of Domain-Based Application Service Identity within Internet Public Key Infrastructure Using X.509 (PKIX) Certificates in the Context of Transport Layer Security (TLS)&quot;">RFC6125</a>].  Use of this
   member is OPTIONAL.

   While there is no requirement that optional JWK members providing key
   usage, algorithm, or other information be present when the "x5u"
   member is used, doing so may improve interoperability for
   applications that do not handle PKIX certificates [<a href="./rfc5280" title="&quot;Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) Profile&quot;">RFC5280</a>].  If
   other members are present, the contents of those members MUST be
   semantically consistent with the related fields in the first
   certificate.  For instance, if the "use" member is present, then it
   MUST correspond to the usage that is specified in the certificate,





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   when it includes this information.  Similarly, if the "alg" member is
   present, it MUST correspond to the algorithm specified in the
   certificate.

<span class="h3"><a class="selflink" id="section-4.7" href="#section-4.7">4.7</a>.  "x5c" (X.509 Certificate Chain) Parameter</span>

   The "x5c" (X.509 certificate chain) parameter contains a chain of one
   or more PKIX certificates [<a href="./rfc5280" title="&quot;Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) Profile&quot;">RFC5280</a>].  The certificate chain is
   represented as a JSON array of certificate value strings.  Each
   string in the array is a base64-encoded (<a href="./rfc4648#section-4">Section&nbsp;4 of [RFC4648]</a> --
   not base64url-encoded) DER [<a href="#ref-ITU.X690.1994">ITU.X690.1994</a>] PKIX certificate value.
   The PKIX certificate containing the key value MUST be the first
   certificate.  This MAY be followed by additional certificates, with
   each subsequent certificate being the one used to certify the
   previous one.  The key in the first certificate MUST match the public
   key represented by other members of the JWK.  Use of this member is
   OPTIONAL.

   As with the "x5u" member, optional JWK members providing key usage,
   algorithm, or other information MAY also be present when the "x5c"
   member is used.  If other members are present, the contents of those
   members MUST be semantically consistent with the related fields in
   the first certificate.  See the last paragraph of <a href="#section-4.6">Section 4.6</a> for
   additional guidance on this.

<span class="h3"><a class="selflink" id="section-4.8" href="#section-4.8">4.8</a>.  "x5t" (X.509 Certificate SHA-1 Thumbprint) Parameter</span>

   The "x5t" (X.509 certificate SHA-1 thumbprint) parameter is a
   base64url-encoded SHA-1 thumbprint (a.k.a. digest) of the DER
   encoding of an X.509 certificate [<a href="./rfc5280" title="&quot;Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) Profile&quot;">RFC5280</a>].  Note that certificate
   thumbprints are also sometimes known as certificate fingerprints.
   The key in the certificate MUST match the public key represented by
   other members of the JWK.  Use of this member is OPTIONAL.

   As with the "x5u" member, optional JWK members providing key usage,
   algorithm, or other information MAY also be present when the "x5t"
   member is used.  If other members are present, the contents of those
   members MUST be semantically consistent with the related fields in
   the referenced certificate.  See the last paragraph of <a href="#section-4.6">Section 4.6</a>
   for additional guidance on this.











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<span class="h3"><a class="selflink" id="section-4.9" href="#section-4.9">4.9</a>.  "x5t#S256" (X.509 Certificate SHA-256 Thumbprint) Parameter</span>

   The "x5t#S256" (X.509 certificate SHA-256 thumbprint) parameter is a
   base64url-encoded SHA-256 thumbprint (a.k.a. digest) of the DER
   encoding of an X.509 certificate [<a href="./rfc5280" title="&quot;Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) Profile&quot;">RFC5280</a>].  Note that certificate
   thumbprints are also sometimes known as certificate fingerprints.
   The key in the certificate MUST match the public key represented by
   other members of the JWK.  Use of this member is OPTIONAL.

   As with the "x5u" member, optional JWK members providing key usage,
   algorithm, or other information MAY also be present when the
   "x5t#S256" member is used.  If other members are present, the
   contents of those members MUST be semantically consistent with the
   related fields in the referenced certificate.  See the last paragraph
   of <a href="#section-4.6">Section 4.6</a> for additional guidance on this.

<span class="h2"><a class="selflink" id="section-5" href="#section-5">5</a>.  JWK Set Format</span>

   A JWK Set is a JSON object that represents a set of JWKs.  The JSON
   object MUST have a "keys" member, with its value being an array of
   JWKs.  This JSON object MAY contain whitespace and/or line breaks.

   The member names within a JWK Set MUST be unique; JWK Set parsers
   MUST either reject JWK Sets with duplicate member names or use a JSON
   parser that returns only the lexically last duplicate member name, as
   specified in <a href="#section-15.12">Section 15.12</a> ("The JSON Object") of ECMAScript 5.1
   [<a href="#ref-ECMAScript">ECMAScript</a>].

   Additional members can be present in the JWK Set; if not understood
   by implementations encountering them, they MUST be ignored.
   Parameters for representing additional properties of JWK Sets should
   either be registered in the IANA "JSON Web Key Set Parameters"
   registry established by <a href="#section-8.4">Section 8.4</a> or be a value that contains a
   Collision-Resistant Name.

   Implementations SHOULD ignore JWKs within a JWK Set that use "kty"
   (key type) values that are not understood by them, that are missing
   required members, or for which values are out of the supported
   ranges.

<span class="h3"><a class="selflink" id="section-5.1" href="#section-5.1">5.1</a>.  "keys" Parameter</span>

   The value of the "keys" parameter is an array of JWK values.  By
   default, the order of the JWK values within the array does not imply
   an order of preference among them, although applications of JWK Sets
   can choose to assign a meaning to the order for their purposes, if
   desired.




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<span class="h2"><a class="selflink" id="section-6" href="#section-6">6</a>.  String Comparison Rules</span>

   The string comparison rules for this specification are the same as
   those defined in Section 5.3 of [<a href="#ref-JWS" title="&quot;JSON Web Signature (JWS)&quot;">JWS</a>].

<span class="h2"><a class="selflink" id="section-7" href="#section-7">7</a>.  Encrypted JWK and Encrypted JWK Set Formats</span>

   Access to JWKs containing non-public key material by parties without
   legitimate access to the non-public information MUST be prevented.
   This can be accomplished by encrypting the JWK when potentially
   observable by such parties to prevent the disclosure of private or
   symmetric key values.  The use of an Encrypted JWK, which is a JWE
   with the UTF-8 encoding of a JWK as its plaintext value, is
   recommended for this purpose.  The processing of Encrypted JWKs is
   identical to the processing of other JWEs.  A "cty" (content type)
   Header Parameter value of "jwk+json" MUST be used to indicate that
   the content of the JWE is a JWK, unless the application knows that
   the encrypted content is a JWK by another means or convention, in
   which case the "cty" value would typically be omitted.

   JWK Sets containing non-public key material will also need to be
   encrypted under these circumstances.  The use of an Encrypted JWK
   Set, which is a JWE with the UTF-8 encoding of a JWK Set as its
   plaintext value, is recommended for this purpose.  The processing of
   Encrypted JWK Sets is identical to the processing of other JWEs.  A
   "cty" (content type) Header Parameter value of "jwk-set+json" MUST be
   used to indicate that the content of the JWE is a JWK Set, unless the
   application knows that the encrypted content is a JWK Set by another
   means or convention, in which case the "cty" value would typically be
   omitted.

   See <a href="#appendix-C">Appendix C</a> for an example encrypted JWK.

<span class="h2"><a class="selflink" id="section-8" href="#section-8">8</a>.  IANA Considerations</span>

   The following registration procedure is used for all the registries
   established by this specification.

   The registration procedure for values is Specification Required
   [<a href="./rfc5226" title="">RFC5226</a>] after a three-week review period on the
   jose-reg-review@ietf.org mailing list, on the advice of one or more
   Designated Experts.  However, to allow for the allocation of values
   prior to publication, the Designated Experts may approve registration
   once they are satisfied that such a specification will be published.

   Registration requests sent to the mailing list for review should use
   an appropriate subject (e.g., "Request to register JWK parameter:
   example").



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   Within the review period, the Designated Experts will either approve
   or deny the registration request, communicating this decision to the
   review list and IANA.  Denials should include an explanation and, if
   applicable, suggestions as to how to make the request successful.
   Registration requests that are undetermined for a period longer than
   21 days can be brought to the IESG's attention (using the
   iesg@ietf.org mailing list) for resolution.

   Criteria that should be applied by the Designated Experts include
   determining whether the proposed registration duplicates existing
   functionality, whether it is likely to be of general applicability or
   useful only for a single application, and whether the registration
   description is clear.

   IANA must only accept registry updates from the Designated Experts
   and should direct all requests for registration to the review mailing
   list.

   It is suggested that multiple Designated Experts be appointed who are
   able to represent the perspectives of different applications using
   this specification, in order to enable broadly informed review of
   registration decisions.  In cases where a registration decision could
   be perceived as creating a conflict of interest for a particular
   Expert, that Expert should defer to the judgment of the other
   Experts.

<span class="h3"><a class="selflink" id="section-8.1" href="#section-8.1">8.1</a>.  JSON Web Key Parameters Registry</span>

   This section establishes the IANA "JSON Web Key Parameters" registry
   for JWK parameter names.  The registry records the parameter name,
   the key type(s) that the parameter is used with, and a reference to
   the specification that defines it.  It also records whether the
   parameter conveys public or private information.  This section
   registers the parameter names defined in <a href="#section-4">Section 4</a>.  The same JWK
   parameter name may be registered multiple times, provided that
   duplicate parameter registrations are only for key-type-specific JWK
   parameters; in this case, the meaning of the duplicate parameter name
   is disambiguated by the "kty" value of the JWK containing it.

<span class="h4"><a class="selflink" id="section-8.1.1" href="#section-8.1.1">8.1.1</a>.  Registration Template</span>

   Parameter Name:
      The name requested (e.g., "kid").  Because a core goal of this
      specification is for the resulting representations to be compact,
      it is RECOMMENDED that the name be short -- not to exceed 8
      characters without a compelling reason to do so.  This name is
      case sensitive.  Names may not match other registered names in a
      case-insensitive manner unless the Designated Experts state that



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      there is a compelling reason to allow an exception.  However,
      matching names may be registered, provided that the accompanying
      sets of "kty" values that the parameter name is used with are
      disjoint; for the purposes of matching "kty" values, "*" matches
      all values.

   Parameter Description:
      Brief description of the parameter (e.g., "Key ID").

   Used with "kty" Value(s):
      The key type parameter value(s) that the parameter name is to be
      used with, or the value "*" if the parameter value is used with
      all key types.  Values may not match other registered "kty" values
      in a case-insensitive manner when the registered parameter name is
      the same (including when the parameter name matches in a case-
      insensitive manner) unless the Designated Experts state that there
      is a compelling reason to allow an exception.

   Parameter Information Class:
      Registers whether the parameter conveys public or private
      information.  Its value must be either Public or Private.

   Change Controller:
      For Standards Track RFCs, list the "IESG".  For others, give the
      name of the responsible party.  Other details (e.g., postal
      address, email address, home page URI) may also be included.

   Specification Document(s):
      Reference to the document or documents that specify the parameter,
      preferably including URIs that can be used to retrieve copies of
      the documents.  An indication of the relevant sections may also be
      included but is not required.

<span class="h4"><a class="selflink" id="section-8.1.2" href="#section-8.1.2">8.1.2</a>.  Initial Registry Contents</span>

   o  Parameter Name: "kty"
   o  Parameter Description: Key Type
   o  Used with "kty" Value(s): *
   o  Parameter Information Class: Public
   o  Change Controller: IESG
   o  Specification Document(s): <a href="./rfc7517#section-4.1">Section&nbsp;4.1 of RFC 7517</a>

   o  Parameter Name: "use"
   o  Parameter Description: Public Key Use
   o  Used with "kty" Value(s): *
   o  Parameter Information Class: Public
   o  Change Controller: IESG
   o  Specification Document(s): <a href="./rfc7517#section-4.2">Section&nbsp;4.2 of RFC 7517</a>



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   o  Parameter Name: "key_ops"
   o  Parameter Description: Key Operations
   o  Used with "kty" Value(s): *
   o  Parameter Information Class: Public
   o  Change Controller: IESG
   o  Specification Document(s): <a href="./rfc7517#section-4.3">Section&nbsp;4.3 of RFC 7517</a>

   o  Parameter Name: "alg"
   o  Parameter Description: Algorithm
   o  Used with "kty" Value(s): *
   o  Parameter Information Class: Public
   o  Change Controller: IESG
   o  Specification Document(s): <a href="./rfc7517#section-4.4">Section&nbsp;4.4 of RFC 7517</a>

   o  Parameter Name: "kid"
   o  Parameter Description: Key ID
   o  Used with "kty" Value(s): *
   o  Parameter Information Class: Public
   o  Change Controller: IESG
   o  Specification Document(s): <a href="./rfc7517#section-4.5">Section&nbsp;4.5 of RFC 7517</a>

   o  Parameter Name: "x5u"
   o  Parameter Description: X.509 URL
   o  Used with "kty" Value(s): *
   o  Parameter Information Class: Public
   o  Change Controller: IESG
   o  Specification Document(s): <a href="./rfc7517#section-4.6">Section&nbsp;4.6 of RFC 7517</a>

   o  Parameter Name: "x5c"
   o  Parameter Description: X.509 Certificate Chain
   o  Used with "kty" Value(s): *
   o  Parameter Information Class: Public
   o  Change Controller: IESG
   o  Specification Document(s): <a href="./rfc7517#section-4.7">Section&nbsp;4.7 of RFC 7517</a>

   o  Parameter Name: "x5t"
   o  Parameter Description: X.509 Certificate SHA-1 Thumbprint
   o  Used with "kty" Value(s): *
   o  Parameter Information Class: Public
   o  Change Controller: IESG
   o  Specification Document(s): <a href="./rfc7517#section-4.8">Section&nbsp;4.8 of RFC 7517</a>

   o  Parameter Name: "x5t#S256"
   o  Parameter Description: X.509 Certificate SHA-256 Thumbprint
   o  Used with "kty" Value(s): *
   o  Parameter Information Class: Public
   o  Change Controller: IESG
   o  Specification Document(s): <a href="./rfc7517#section-4.9">Section&nbsp;4.9 of RFC 7517</a>



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<span class="h3"><a class="selflink" id="section-8.2" href="#section-8.2">8.2</a>.  JSON Web Key Use Registry</span>

   This section establishes the IANA "JSON Web Key Use" registry for JWK
   "use" (public key use) member values.  The registry records the
   public key use value and a reference to the specification that
   defines it.  This section registers the parameter names defined in
   <a href="#section-4.2">Section 4.2</a>.

<span class="h4"><a class="selflink" id="section-8.2.1" href="#section-8.2.1">8.2.1</a>.  Registration Template</span>

   Use Member Value:
      The name requested (e.g., "sig").  Because a core goal of this
      specification is for the resulting representations to be compact,
      it is RECOMMENDED that the name be short -- not to exceed 8
      characters without a compelling reason to do so.  This name is
      case sensitive.  Names may not match other registered names in a
      case-insensitive manner unless the Designated Experts state that
      there is a compelling reason to allow an exception.

   Use Description:
      Brief description of the use (e.g., "Digital Signature or MAC").

   Change Controller:
      For Standards Track RFCs, list the "IESG".  For others, give the
      name of the responsible party.  Other details (e.g., postal
      address, email address, home page URI) may also be included.

   Specification Document(s):
      Reference to the document or documents that specify the parameter,
      preferably including URIs that can be used to retrieve copies of
      the documents.  An indication of the relevant sections may also be
      included but is not required.

<span class="h4"><a class="selflink" id="section-8.2.2" href="#section-8.2.2">8.2.2</a>.  Initial Registry Contents</span>

   o  Use Member Value: "sig"
   o  Use Description: Digital Signature or MAC
   o  Change Controller: IESG
   o  Specification Document(s): <a href="./rfc7517#section-4.2">Section&nbsp;4.2 of RFC 7517</a>

   o  Use Member Value: "enc"
   o  Use Description: Encryption
   o  Change Controller: IESG
   o  Specification Document(s): <a href="./rfc7517#section-4.2">Section&nbsp;4.2 of RFC 7517</a>







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<span class="h3"><a class="selflink" id="section-8.3" href="#section-8.3">8.3</a>.  JSON Web Key Operations Registry</span>

   This section establishes the IANA "JSON Web Key Operations" registry
   for values of JWK "key_ops" array elements.  The registry records the
   key operation value and a reference to the specification that defines
   it.  This section registers the parameter names defined in
   <a href="#section-4.3">Section 4.3</a>.

<span class="h4"><a class="selflink" id="section-8.3.1" href="#section-8.3.1">8.3.1</a>.  Registration Template</span>

   Key Operation Value:
      The name requested (e.g., "sign").  Because a core goal of this
      specification is for the resulting representations to be compact,
      it is RECOMMENDED that the name be short -- not to exceed 8
      characters without a compelling reason to do so.  This name is
      case sensitive.  Names may not match other registered names in a
      case-insensitive manner unless the Designated Experts state that
      there is a compelling reason to allow an exception.

   Key Operation Description:
      Brief description of the key operation (e.g., "Compute digital
      signature or MAC").

   Change Controller:
      For Standards Track RFCs, list the "IESG".  For others, give the
      name of the responsible party.  Other details (e.g., postal
      address, email address, home page URI) may also be included.

   Specification Document(s):
      Reference to the document or documents that specify the parameter,
      preferably including URIs that can be used to retrieve copies of
      the documents.  An indication of the relevant sections may also be
      included but is not required.

<span class="h4"><a class="selflink" id="section-8.3.2" href="#section-8.3.2">8.3.2</a>.  Initial Registry Contents</span>

   o  Key Operation Value: "sign"
   o  Key Operation Description: Compute digital signature or MAC
   o  Change Controller: IESG
   o  Specification Document(s): <a href="./rfc7517#section-4.3">Section&nbsp;4.3 of RFC 7517</a>

   o  Key Operation Value: "verify"
   o  Key Operation Description: Verify digital signature or MAC
   o  Change Controller: IESG
   o  Specification Document(s): <a href="./rfc7517#section-4.3">Section&nbsp;4.3 of RFC 7517</a>






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   o  Key Operation Value: "encrypt"
   o  Key Operation Description: Encrypt content
   o  Change Controller: IESG
   o  Specification Document(s): <a href="./rfc7517#section-4.3">Section&nbsp;4.3 of RFC 7517</a>

   o  Key Operation Value: "decrypt"
   o  Key Operation Description: Decrypt content and validate
      decryption, if applicable
   o  Change Controller: IESG
   o  Specification Document(s): <a href="./rfc7517#section-4.3">Section&nbsp;4.3 of RFC 7517</a>

   o  Key Operation Value: "wrapKey"
   o  Key Operation Description: Encrypt key
   o  Change Controller: IESG
   o  Specification Document(s): <a href="./rfc7517#section-4.3">Section&nbsp;4.3 of RFC 7517</a>

   o  Key Operation Value: "unwrapKey"
   o  Key Operation Description: Decrypt key and validate decryption, if
      applicable
   o  Change Controller: IESG
   o  Specification Document(s): <a href="./rfc7517#section-4.3">Section&nbsp;4.3 of RFC 7517</a>

   o  Key Operation Value: "deriveKey"
   o  Key Operation Description: Derive key
   o  Change Controller: IESG
   o  Specification Document(s): <a href="./rfc7517#section-4.3">Section&nbsp;4.3 of RFC 7517</a>
   o  Key Operation Value: "deriveBits"
   o  Key Operation Description: Derive bits not to be used as a key
   o  Change Controller: IESG
   o  Specification Document(s): <a href="./rfc7517#section-4.3">Section&nbsp;4.3 of RFC 7517</a>

<span class="h3"><a class="selflink" id="section-8.4" href="#section-8.4">8.4</a>.  JSON Web Key Set Parameters Registry</span>

   This section establishes the IANA "JSON Web Key Set Parameters"
   registry for JWK Set parameter names.  The registry records the
   parameter name and a reference to the specification that defines it.
   This section registers the parameter names defined in <a href="#section-5">Section 5</a>.

<span class="h4"><a class="selflink" id="section-8.4.1" href="#section-8.4.1">8.4.1</a>.  Registration Template</span>

   Parameter Name:
      The name requested (e.g., "keys").  Because a core goal of this
      specification is for the resulting representations to be compact,
      it is RECOMMENDED that the name be short -- not to exceed 8
      characters without a compelling reason to do so.  This name is
      case sensitive.  Names may not match other registered names in a
      case-insensitive manner unless the Designated Experts state that
      there is a compelling reason to allow an exception.



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   Parameter Description:
      Brief description of the parameter (e.g., "Array of JWK values").

   Change Controller:
      For Standards Track RFCs, list the "IESG".  For others, give the
      name of the responsible party.  Other details (e.g., postal
      address, email address, home page URI) may also be included.

   Specification Document(s):
      Reference to the document or documents that specify the parameter,
      preferably including URIs that can be used to retrieve copies of
      the documents.  An indication of the relevant sections may also be
      included but is not required.

<span class="h4"><a class="selflink" id="section-8.4.2" href="#section-8.4.2">8.4.2</a>.  Initial Registry Contents</span>

   o  Parameter Name: "keys"
   o  Parameter Description: Array of JWK Values
   o  Change Controller: IESG
   o  Specification Document(s): <a href="./rfc7517#section-5.1">Section&nbsp;5.1 of RFC 7517</a>

<span class="h3"><a class="selflink" id="section-8.5" href="#section-8.5">8.5</a>.  Media Type Registration</span>

<span class="h4"><a class="selflink" id="section-8.5.1" href="#section-8.5.1">8.5.1</a>.  Registry Contents</span>

   This section registers the "application/jwk+json" and "application/
   jwk-set+json" media types [<a href="./rfc2046" title="&quot;Multipurpose Internet Mail Extensions (MIME) Part Two: Media Types&quot;">RFC2046</a>] in the "Media Types" registry
   [<a href="#ref-IANA.MediaTypes">IANA.MediaTypes</a>] in the manner described in <a href="./rfc6838">RFC 6838</a> [<a href="./rfc6838" title="&quot;Media Type Specifications and Registration Procedures&quot;">RFC6838</a>],
   which can be used to indicate that the content is a JWK or a JWK Set,
   respectively.

   o  Type Name: application
   o  Subtype Name: jwk+json
   o  Required Parameters: n/a
   o  Optional Parameters: n/a
   o  Encoding considerations: 8bit; application/jwk+json values are
      represented as a JSON object; UTF-8 encoding SHOULD be employed
      for the JSON object.
   o  Security Considerations: See the Security Considerations section
      of <a href="./rfc7517">RFC 7517</a>.
   o  Interoperability Considerations: n/a
   o  Published Specification: <a href="./rfc7517">RFC 7517</a>
   o  Applications that use this media type: OpenID Connect, Salesforce,
      Google, Android, Windows Azure, W3C WebCrypto API, numerous others
   o  Fragment identifier considerations: n/a






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   o  Additional Information:

         Magic number(s): n/a
         File extension(s): n/a
         Macintosh file type code(s): n/a

   o  Person &amp; email address to contact for further information:
      Michael B.  Jones, mbj@microsoft.com
   o  Intended Usage: COMMON
   o  Restrictions on Usage: none
   o  Author: Michael B.  Jones, mbj@microsoft.com
   o  Change Controller: IESG
   o  Provisional registration?  No

   o  Type Name: application
   o  Subtype Name: jwk-set+json
   o  Required Parameters: n/a
   o  Optional Parameters: n/a
   o  Encoding considerations: 8bit; application/jwk-set+json values are
      represented as a JSON Object; UTF-8 encoding SHOULD be employed
      for the JSON object.
   o  Security Considerations: See the Security Considerations section
      of <a href="./rfc7517">RFC 7517</a>.
   o  Interoperability Considerations: n/a
   o  Published Specification: <a href="./rfc7517">RFC 7517</a>
   o  Applications that use this media type: OpenID Connect, Salesforce,
      Google, Android, Windows Azure, W3C WebCrypto API, numerous others
   o  Fragment identifier considerations: n/a
   o  Additional Information:

         Magic number(s): n/a
         File extension(s): n/a
         Macintosh file type code(s): n/a

   o  Person &amp; email address to contact for further information:
      Michael B.  Jones, mbj@microsoft.com
   o  Intended Usage: COMMON
   o  Restrictions on Usage: none
   o  Author: Michael B.  Jones, mbj@microsoft.com
   o  Change Controller: IESG
   o  Provisional registration?  No

<span class="h2"><a class="selflink" id="section-9" href="#section-9">9</a>.  Security Considerations</span>

   All of the security issues that are pertinent to any cryptographic
   application must be addressed by JWS/JWE/JWK agents.  Among these
   issues are protecting the user's asymmetric private and symmetric
   secret keys and employing countermeasures to various attacks.



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<span class="h3"><a class="selflink" id="section-9.1" href="#section-9.1">9.1</a>.  Key Provenance and Trust</span>

   One should place no more trust in the data cryptographically secured
   by a key than in the method by which it was obtained and in the
   trustworthiness of the entity asserting an association with the key.
   Any data associated with a key that is obtained in an untrusted
   manner should be treated with skepticism.  See Section 10.3 of [<a href="#ref-JWS" title="&quot;JSON Web Signature (JWS)&quot;">JWS</a>]
   for security considerations on key origin authentication.

   In almost all cases, applications make decisions about whether to
   trust a key based on attributes bound to the key, such as names,
   roles, and the key origin, rather than based on the key itself.  When
   an application is deciding whether to trust a key, there are several
   ways that it can bind attributes to a JWK.  Two example mechanisms
   are PKIX [<a href="./rfc5280" title="&quot;Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) Profile&quot;">RFC5280</a>] and JSON Web Token (JWT) [<a href="#ref-JWT" title="&quot;JSON Web Token (JWT)&quot;">JWT</a>].

   For instance, the creator of a JWK can include a PKIX certificate in
   the JWK's "x5c" member.  If the application validates the certificate
   and verifies that the JWK corresponds to the subject public key in
   the certificate, then the JWK can be associated with the attributes
   in the certificate, such as the subject name, subject alternative
   names, extended key usages, and its signature chain.

   As another example, a JWT can be used to associate attributes with a
   JWK by referencing the JWK as a claim in the JWT.  The JWK can be
   included directly as a claim value or the JWT can include a TLS-
   secured URI from which to retrieve the JWK value.  Either way, an
   application that gets a JWK via a JWT claim can associate it with the
   JWT's cryptographic properties and use these and possibly additional
   claims in deciding whether to trust the key.

   The security considerations in <a href="#section-12.3">Section 12.3</a> of XML DSIG 2.0
   [<a href="#ref-W3C.NOTE-xmldsig-core2-20130411">W3C.NOTE-xmldsig-core2-20130411</a>] about the strength of a digital
   signature depending upon all the links in the security chain also
   apply to this specification.

   The TLS Requirements in Section 8 of [<a href="#ref-JWS" title="&quot;JSON Web Signature (JWS)&quot;">JWS</a>] also apply to this
   specification, except that the "x5u" JWK member is the only feature
   defined by this specification using TLS.

<span class="h3"><a class="selflink" id="section-9.2" href="#section-9.2">9.2</a>.  Preventing Disclosure of Non-public Key Information</span>

   Private and symmetric keys MUST be protected from disclosure to
   unintended parties.  One recommended means of doing so is to encrypt
   JWKs or JWK Sets containing them by using the JWK or JWK Set value as
   the plaintext of a JWE.  Of course, this requires that there be a





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   secure way to obtain the key used to encrypt the non-public key
   information to the intended party and a secure way for that party to
   obtain the corresponding decryption key.

   The security considerations in <a href="./rfc3447">RFC 3447</a> [<a href="./rfc3447" title="&quot;Public-Key Cryptography Standards (PKCS) #1: RSA Cryptography Specifications Version 2.1&quot;">RFC3447</a>] and <a href="./rfc6030">RFC 6030</a>
   [<a href="./rfc6030" title="&quot;Portable Symmetric Key Container (PSKC)&quot;">RFC6030</a>] about protecting private and symmetric keys, key usage, and
   information leakage also apply to this specification.

<span class="h3"><a class="selflink" id="section-9.3" href="#section-9.3">9.3</a>.  RSA Private Key Representations and Blinding</span>

   The RSA Key blinding operation [<a href="#ref-Kocher" title="&quot;Timing Attacks on Implementations of Diffe-Hellman, RSA, DSS, and Other Systems&quot;">Kocher</a>], which is a defense against
   some timing attacks, requires all of the RSA key values "n", "e", and
   "d".  However, some RSA private key representations do not include
   the public exponent "e", but only include the modulus "n" and the
   private exponent "d".  This is true, for instance, of the Java
   RSAPrivateKeySpec API, which does not include the public exponent "e"
   as a parameter.  So as to enable RSA key blinding, such
   representations should be avoided.  For Java, the
   RSAPrivateCrtKeySpec API can be used instead.  <a href="#section-8.2.2">Section 8.2.2</a>(i) of
   the "Handbook of Applied Cryptography" [<a href="#ref-HAC" title="&quot;Handbook of Applied Cryptography&quot;">HAC</a>] discusses how to compute
   the remaining RSA private key parameters, if needed, using only "n",
   "e", and "d".

<span class="h3"><a class="selflink" id="section-9.4" href="#section-9.4">9.4</a>.  Key Entropy and Random Values</span>

   See Section 10.1 of [<a href="#ref-JWS" title="&quot;JSON Web Signature (JWS)&quot;">JWS</a>] for security considerations on key entropy
   and random values.

<span class="h2"><a class="selflink" id="section-10" href="#section-10">10</a>.  References</span>

<span class="h3"><a class="selflink" id="section-10.1" href="#section-10.1">10.1</a>.  Normative References</span>

   [<a id="ref-ECMAScript">ECMAScript</a>]
              Ecma International, "ECMAScript Language Specification,
              5.1 Edition", ECMA Standard 262, June 2011,
              &lt;<a href="http://www.ecma-international.org/ecma-262/5.1/ECMA-262.pdf">http://www.ecma-international.org/ecma-262/5.1/</a>
              <a href="http://www.ecma-international.org/ecma-262/5.1/ECMA-262.pdf">ECMA-262.pdf</a>&gt;.

   [<a id="ref-IANA.MediaTypes">IANA.MediaTypes</a>]
              Internet Assigned Numbers Authority (IANA), "Media Types",
              &lt;<a href="http://www.iana.org/assignments/media-types">http://www.iana.org/assignments/media-types</a>&gt;.

   [<a id="ref-ITU.X690.1994">ITU.X690.1994</a>]
              International Telecommunications Union, "Information
              Technology - ASN.1 encoding rules: Specification of Basic
              Encoding Rules (BER), Canonical Encoding Rules (CER) and
              Distinguished Encoding Rules (DER)", ITU-T Recommendation
              X.690, 1994.



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   [<a id="ref-JWA">JWA</a>]      Jones, M., "JSON Web Algorithms (JWA)", <a href="./rfc7518">RFC 7518</a>,
              DOI 10.17487/RFC7518, May 2015,
              &lt;<a href="http://www.rfc-editor.org/info/rfc7518">http://www.rfc-editor.org/info/rfc7518</a>&gt;.

   [<a id="ref-JWE">JWE</a>]      Jones, M. and J. Hildebrand, "JSON Web Encryption (JWE)",
              <a href="./rfc7516">RFC 7516</a>, DOI 10.17487/RFC7516, May 2015,
              &lt;<a href="http://www.rfc-editor.org/info/rfc7516">http://www.rfc-editor.org/info/rfc7516</a>&gt;.

   [<a id="ref-JWS">JWS</a>]      Jones, M., Bradley, J., and N. Sakimura, "JSON Web
              Signature (JWS)", <a href="./rfc7515">RFC 7515</a>, DOI 10.17487/RFC7515, May
              2015, &lt;<a href="http://www.rfc-editor.org/info/rfc7515">http://www.rfc-editor.org/info/rfc7515</a>&gt;.

   [<a id="ref-RFC20">RFC20</a>]    Cerf, V., "ASCII format for Network Interchange", STD 80,
              <a href="./rfc20">RFC 20</a>, DOI 10.17487/RFC0020, October 1969,
              &lt;<a href="http://www.rfc-editor.org/info/rfc20">http://www.rfc-editor.org/info/rfc20</a>&gt;.

   [<a id="ref-RFC2046">RFC2046</a>]  Freed, N. and N. Borenstein, "Multipurpose Internet Mail
              Extensions (MIME) Part Two: Media Types", <a href="./rfc2046">RFC 2046</a>,
              DOI 10.17487/RFC2046, November 1996,
              &lt;<a href="http://www.rfc-editor.org/info/rfc2046">http://www.rfc-editor.org/info/rfc2046</a>&gt;.

   [<a id="ref-RFC2119">RFC2119</a>]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", <a href="https://www.rfc-editor.org/bcp/bcp14">BCP 14</a>, <a href="./rfc2119">RFC 2119</a>,
              DOI 10.17487/RFC2119, March 1997,
              &lt;<a href="http://www.rfc-editor.org/info/rfc2119">http://www.rfc-editor.org/info/rfc2119</a>&gt;.

   [<a id="ref-RFC2818">RFC2818</a>]  Rescorla, E., "HTTP Over TLS", <a href="./rfc2818">RFC 2818</a>,
              DOI 10.17487/RFC2818, May 2000,
              &lt;<a href="http://www.rfc-editor.org/info/rfc2818">http://www.rfc-editor.org/info/rfc2818</a>&gt;.

   [<a id="ref-RFC3629">RFC3629</a>]  Yergeau, F., "UTF-8, a transformation format of ISO
              10646", STD 63, <a href="./rfc3629">RFC 3629</a>, DOI 10.17487/RFC3629, November
              2003, &lt;<a href="http://www.rfc-editor.org/info/rfc3629">http://www.rfc-editor.org/info/rfc3629</a>&gt;.

   [<a id="ref-RFC3986">RFC3986</a>]  Berners-Lee, T., Fielding, R., and L. Masinter, "Uniform
              Resource Identifier (URI): Generic Syntax", STD 66,
              <a href="./rfc3986">RFC 3986</a>, DOI 10.17487/RFC3986, January 2005,
              &lt;<a href="http://www.rfc-editor.org/info/rfc3986">http://www.rfc-editor.org/info/rfc3986</a>&gt;.

   [<a id="ref-RFC4648">RFC4648</a>]  Josefsson, S., "The Base16, Base32, and Base64 Data
              Encodings", <a href="./rfc4648">RFC 4648</a>, DOI 10.17487/RFC4648, October 2006,
              &lt;<a href="http://www.rfc-editor.org/info/rfc4648">http://www.rfc-editor.org/info/rfc4648</a>&gt;.

   [<a id="ref-RFC4945">RFC4945</a>]  Korver, B., "The Internet IP Security PKI Profile of
              IKEv1/ISAKMP, IKEv2, and PKIX", <a href="./rfc4945">RFC 4945</a>,
              DOI 10.17487/RFC4945, August 2007,
              &lt;<a href="http://www.rfc-editor.org/info/rfc4945">http://www.rfc-editor.org/info/rfc4945</a>&gt;.




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   [<a id="ref-RFC4949">RFC4949</a>]  Shirey, R., "Internet Security Glossary, Version 2",
              FYI 36, <a href="./rfc4949">RFC 4949</a>, DOI 10.17487/RFC4949, August 2007,
              &lt;<a href="http://www.rfc-editor.org/info/rfc4949">http://www.rfc-editor.org/info/rfc4949</a>&gt;.

   [<a id="ref-RFC5246">RFC5246</a>]  Dierks, T. and E. Rescorla, "The Transport Layer Security
              (TLS) Protocol Version 1.2", <a href="./rfc5246">RFC 5246</a>,
              DOI 10.17487/RFC5246, August 2008,
              &lt;<a href="http://www.rfc-editor.org/info/rfc5246">http://www.rfc-editor.org/info/rfc5246</a>&gt;.

   [<a id="ref-RFC5280">RFC5280</a>]  Cooper, D., Santesson, S., Farrell, S., Boeyen, S.,
              Housley, R., and W. Polk, "Internet X.509 Public Key
              Infrastructure Certificate and Certificate Revocation List
              (CRL) Profile", <a href="./rfc5280">RFC 5280</a>, DOI 10.17487/RFC5280, May 2008,
              &lt;<a href="http://www.rfc-editor.org/info/rfc5280">http://www.rfc-editor.org/info/rfc5280</a>&gt;.

   [<a id="ref-RFC6125">RFC6125</a>]  Saint-Andre, P. and J. Hodges, "Representation and
              Verification of Domain-Based Application Service Identity
              within Internet Public Key Infrastructure Using X.509
              (PKIX) Certificates in the Context of Transport Layer
              Security (TLS)", <a href="./rfc6125">RFC 6125</a>, DOI 10.17487/RFC6125, March
              2011, &lt;<a href="http://www.rfc-editor.org/info/rfc6125">http://www.rfc-editor.org/info/rfc6125</a>&gt;.

   [<a id="ref-RFC7159">RFC7159</a>]  Bray, T., Ed., "The JavaScript Object Notation (JSON) Data
              Interchange Format", <a href="./rfc7159">RFC 7159</a>, DOI 10.17487/RFC7159, March
              2014, &lt;<a href="http://www.rfc-editor.org/info/rfc7159">http://www.rfc-editor.org/info/rfc7159</a>&gt;.

   [<a id="ref-UNICODE">UNICODE</a>]  The Unicode Consortium, "The Unicode Standard",
              &lt;<a href="http://www.unicode.org/versions/latest/">http://www.unicode.org/versions/latest/</a>&gt;.

<span class="h3"><a class="selflink" id="section-10.2" href="#section-10.2">10.2</a>.  Informative References</span>

   [<a id="ref-DSS">DSS</a>]      National Institute of Standards and Technology (NIST),
              "Digital Signature Standard (DSS)", FIPS PUB 186-4, July
              2013, &lt;<a href="http://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.186-4.pdf">http://nvlpubs.nist.gov/nistpubs/FIPS/</a>
              <a href="http://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.186-4.pdf">NIST.FIPS.186-4.pdf</a>&gt;.

   [<a id="ref-HAC">HAC</a>]      Menezes, A., van Oorschot, P., and S. Vanstone, "Handbook
              of Applied Cryptography", CRC Press, October 1996,
              &lt;<a href="http://cacr.uwaterloo.ca/hac/">http://cacr.uwaterloo.ca/hac/</a>&gt;.

   [<a id="ref-JWT">JWT</a>]      Jones, M., Bradley, J., and N. Sakimura, "JSON Web Token
              (JWT)", <a href="./rfc7519">RFC 7519</a>, DOI 10.17487/RFC7519, May 2015,
              &lt;<a href="http://www.rfc-editor.org/info/rfc7519">http://www.rfc-editor.org/info/rfc7519</a>&gt;.








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   [<a id="ref-Kocher">Kocher</a>]   Kocher, P., "Timing Attacks on Implementations of
              Diffe-Hellman, RSA, DSS, and Other Systems", In
              Proceedings of the 16th Annual International Cryptology
              Conference Advances in Cryptology, Springer-Verlag, pp.
              104-113, 1996.

   [<a id="ref-MagicSignatures">MagicSignatures</a>]
              Panzer, J., Ed., Laurie, B., and D. Balfanz, "Magic
              Signatures", January 2011,
              &lt;<a href="http://salmon-protocol.googlecode.com/svn/trunk/draft-panzer-magicsig-01.html">http://salmon-protocol.googlecode.com/svn/trunk/</a>
              <a href="http://salmon-protocol.googlecode.com/svn/trunk/draft-panzer-magicsig-01.html">draft-panzer-magicsig-01.html</a>&gt;.

   [<a id="ref-RFC3447">RFC3447</a>]  Jonsson, J. and B. Kaliski, "Public-Key Cryptography
              Standards (PKCS) #1: RSA Cryptography Specifications
              Version 2.1", <a href="./rfc3447">RFC 3447</a>, DOI 10.17487/RFC3447, February
              2003, &lt;<a href="http://www.rfc-editor.org/info/rfc3447">http://www.rfc-editor.org/info/rfc3447</a>&gt;.

   [<a id="ref-RFC5226">RFC5226</a>]  Narten, T. and H. Alvestrand, "Guidelines for Writing an
              IANA Considerations Section in RFCs", <a href="https://www.rfc-editor.org/bcp/bcp26">BCP 26</a>, <a href="./rfc5226">RFC 5226</a>,
              DOI 10.17487/RFC5226, May 2008,
              &lt;<a href="http://www.rfc-editor.org/info/rfc5226">http://www.rfc-editor.org/info/rfc5226</a>&gt;.

   [<a id="ref-RFC6030">RFC6030</a>]  Hoyer, P., Pei, M., and S. Machani, "Portable Symmetric
              Key Container (PSKC)", <a href="./rfc6030">RFC 6030</a>, DOI 10.17487/RFC6030,
              October 2010, &lt;<a href="http://www.rfc-editor.org/info/rfc6030">http://www.rfc-editor.org/info/rfc6030</a>&gt;.

   [<a id="ref-RFC6838">RFC6838</a>]  Freed, N., Klensin, J., and T. Hansen, "Media Type
              Specifications and Registration Procedures", <a href="https://www.rfc-editor.org/bcp/bcp13">BCP 13</a>,
              <a href="./rfc6838">RFC 6838</a>, DOI 10.17487/RFC6838, January 2013,
              &lt;<a href="http://www.rfc-editor.org/info/rfc6838">http://www.rfc-editor.org/info/rfc6838</a>&gt;.

   [<a id="ref-W3C.CR-WebCryptoAPI-20141211">W3C.CR-WebCryptoAPI-20141211</a>]
              Sleevi, R. and M. Watson, "Web Cryptography API", World
              Wide Web Consortium Candidate Recommendation
              CR-WebCryptoAPI-20141211, December 2014,
              &lt;<a href="http://www.w3.org/TR/2014/CR-WebCryptoAPI-20141211/">http://www.w3.org/TR/2014/CR-WebCryptoAPI-20141211/</a>&gt;.

   [<a id="ref-W3C.NOTE-xmldsig-core2-20130411">W3C.NOTE-xmldsig-core2-20130411</a>]
              Eastlake, D., Reagle, J., Solo, D., Hirsch, F., Roessler,
              T., Yiu, K., Datta, P., and S. Cantor, "XML Signature
              Syntax and Processing Version 2.0", World Wide Web
              Consortium Note NOTE-xmldsig-core2-20130411, April 2013,
              &lt;<a href="http://www.w3.org/TR/2013/NOTE-xmldsig-core2-20130411/">http://www.w3.org/TR/2013/NOTE-xmldsig-core2-20130411/</a>&gt;.








<span class="grey">Jones                        Standards Track                   [Page 24]</span></pre>
<hr class='noprint'/><!--NewPage--><pre class='newpage'><span id="page-25" ></span>
<span class="grey"><a href="./rfc7517">RFC 7517</a>                   JSON Web Key (JWK)                   May 2015</span>


<span class="h2"><a class="selflink" id="appendix-A" href="#appendix-A">Appendix A</a>.  Example JSON Web Key Sets</span>

<span class="h3"><a class="selflink" id="appendix-A.1" href="#appendix-A.1">A.1</a>.  Example Public Keys</span>

   The following example JWK Set contains two public keys represented as
   JWKs: one using an Elliptic Curve algorithm and a second one using an
   RSA algorithm.  The first specifies that the key is to be used for
   encryption.  The second specifies that the key is to be used with the
   "RS256" algorithm.  Both provide a key ID for key matching purposes.
   In both cases, integers are represented using the base64url encoding
   of their big-endian representations.  (Line breaks within values are
   for display purposes only.)

     {"keys":
       [
         {"kty":"EC",
          "crv":"P-256",
          "x":"MKBCTNIcKUSDii11ySs3526iDZ8AiTo7Tu6KPAqv7D4",
          "y":"4Etl6SRW2YiLUrN5vfvVHuhp7x8PxltmWWlbbM4IFyM",
          "use":"enc",
          "kid":"1"},

         {"kty":"RSA",
          "n": "0vx7agoebGcQSuuPiLJXZptN9nndrQmbXEps2aiAFbWhM78LhWx
     4cbbfAAtVT86zwu1RK7aPFFxuhDR1L6tSoc_BJECPebWKRXjBZCiFV4n3oknjhMs
     tn64tZ_2W-5JsGY4Hc5n9yBXArwl93lqt7_RN5w6Cf0h4QyQ5v-65YGjQR0_FDW2
     QvzqY368QQMicAtaSqzs8KJZgnYb9c7d0zgdAZHzu6qMQvRL5hajrn1n91CbOpbI
     SD08qNLyrdkt-bFTWhAI4vMQFh6WeZu0fM4lFd2NcRwr3XPksINHaQ-G_xBniIqb
     w0Ls1jF44-csFCur-kEgU8awapJzKnqDKgw",
          "e":"AQAB",
          "alg":"RS256",
          "kid":"2011-04-29"}
       ]
     }

<span class="h3"><a class="selflink" id="appendix-A.2" href="#appendix-A.2">A.2</a>.  Example Private Keys</span>

   The following example JWK Set contains two keys represented as JWKs
   containing both public and private key values: one using an Elliptic
   Curve algorithm and a second one using an RSA algorithm.  This
   example extends the example in the previous section, adding private
   key values.  (Line breaks within values are for display purposes
   only.)








<span class="grey">Jones                        Standards Track                   [Page 25]</span></pre>
<hr class='noprint'/><!--NewPage--><pre class='newpage'><span id="page-26" ></span>
<span class="grey"><a href="./rfc7517">RFC 7517</a>                   JSON Web Key (JWK)                   May 2015</span>


     {"keys":
       [
         {"kty":"EC",
          "crv":"P-256",
          "x":"MKBCTNIcKUSDii11ySs3526iDZ8AiTo7Tu6KPAqv7D4",
          "y":"4Etl6SRW2YiLUrN5vfvVHuhp7x8PxltmWWlbbM4IFyM",
          "d":"870MB6gfuTJ4HtUnUvYMyJpr5eUZNP4Bk43bVdj3eAE",
          "use":"enc",
          "kid":"1"},

         {"kty":"RSA",
          "n":"0vx7agoebGcQSuuPiLJXZptN9nndrQmbXEps2aiAFbWhM78LhWx4
     cbbfAAtVT86zwu1RK7aPFFxuhDR1L6tSoc_BJECPebWKRXjBZCiFV4n3oknjhMst
     n64tZ_2W-5JsGY4Hc5n9yBXArwl93lqt7_RN5w6Cf0h4QyQ5v-65YGjQR0_FDW2Q
     vzqY368QQMicAtaSqzs8KJZgnYb9c7d0zgdAZHzu6qMQvRL5hajrn1n91CbOpbIS
     D08qNLyrdkt-bFTWhAI4vMQFh6WeZu0fM4lFd2NcRwr3XPksINHaQ-G_xBniIqbw
     0Ls1jF44-csFCur-kEgU8awapJzKnqDKgw",
          "e":"AQAB",
          "d":"X4cTteJY_gn4FYPsXB8rdXix5vwsg1FLN5E3EaG6RJoVH-HLLKD9
     M7dx5oo7GURknchnrRweUkC7hT5fJLM0WbFAKNLWY2vv7B6NqXSzUvxT0_YSfqij
     wp3RTzlBaCxWp4doFk5N2o8Gy_nHNKroADIkJ46pRUohsXywbReAdYaMwFs9tv8d
     _cPVY3i07a3t8MN6TNwm0dSawm9v47UiCl3Sk5ZiG7xojPLu4sbg1U2jx4IBTNBz
     nbJSzFHK66jT8bgkuqsk0GjskDJk19Z4qwjwbsnn4j2WBii3RL-Us2lGVkY8fkFz
     me1z0HbIkfz0Y6mqnOYtqc0X4jfcKoAC8Q",
          "p":"83i-7IvMGXoMXCskv73TKr8637FiO7Z27zv8oj6pbWUQyLPQBQxtPV
     nwD20R-60eTDmD2ujnMt5PoqMrm8RfmNhVWDtjjMmCMjOpSXicFHj7XOuVIYQyqV
     WlWEh6dN36GVZYk93N8Bc9vY41xy8B9RzzOGVQzXvNEvn7O0nVbfs",
          "q":"3dfOR9cuYq-0S-mkFLzgItgMEfFzB2q3hWehMuG0oCuqnb3vobLyum
     qjVZQO1dIrdwgTnCdpYzBcOfW5r370AFXjiWft_NGEiovonizhKpo9VVS78TzFgx
     kIdrecRezsZ-1kYd_s1qDbxtkDEgfAITAG9LUnADun4vIcb6yelxk",
          "dp":"G4sPXkc6Ya9y8oJW9_ILj4xuppu0lzi_H7VTkS8xj5SdX3coE0oim
     YwxIi2emTAue0UOa5dpgFGyBJ4c8tQ2VF402XRugKDTP8akYhFo5tAA77Qe_Nmtu
     YZc3C3m3I24G2GvR5sSDxUyAN2zq8Lfn9EUms6rY3Ob8YeiKkTiBj0",
          "dq":"s9lAH9fggBsoFR8Oac2R_E2gw282rT2kGOAhvIllETE1efrA6huUU
     vMfBcMpn8lqeW6vzznYY5SSQF7pMdC_agI3nG8Ibp1BUb0JUiraRNqUfLhcQb_d9
     GF4Dh7e74WbRsobRonujTYN1xCaP6TO61jvWrX-L18txXw494Q_cgk",
          "qi":"GyM_p6JrXySiz1toFgKbWV-JdI3jQ4ypu9rbMWx3rQJBfmt0FoYzg
     UIZEVFEcOqwemRN81zoDAaa-Bk0KWNGDjJHZDdDmFhW3AN7lI-puxk_mHZGJ11rx
     yR8O55XLSe3SPmRfKwZI6yU24ZxvQKFYItdldUKGzO6Ia6zTKhAVRU",
          "alg":"RS256",
          "kid":"2011-04-29"}
       ]
     }








<span class="grey">Jones                        Standards Track                   [Page 26]</span></pre>
<hr class='noprint'/><!--NewPage--><pre class='newpage'><span id="page-27" ></span>
<span class="grey"><a href="./rfc7517">RFC 7517</a>                   JSON Web Key (JWK)                   May 2015</span>


<span class="h3"><a class="selflink" id="appendix-A.3" href="#appendix-A.3">A.3</a>.  Example Symmetric Keys</span>

   The following example JWK Set contains two symmetric keys represented
   as JWKs: one designated as being for use with the AES Key Wrap
   algorithm and a second one that is an HMAC key.  (Line breaks within
   values are for display purposes only.)

     {"keys":
       [
         {"kty":"oct",
          "alg":"A128KW",
          "k":"GawgguFyGrWKav7AX4VKUg"},

         {"kty":"oct",
          "k":"AyM1SysPpbyDfgZld3umj1qzKObwVMkoqQ-EstJQLr_T-1qS0gZH75
     aKtMN3Yj0iPS4hcgUuTwjAzZr1Z9CAow",
          "kid":"HMAC key used in JWS spec <a href="#appendix-A.1">Appendix A.1</a> example"}
       ]
     }
































<span class="grey">Jones                        Standards Track                   [Page 27]</span></pre>
<hr class='noprint'/><!--NewPage--><pre class='newpage'><span id="page-28" ></span>
<span class="grey"><a href="./rfc7517">RFC 7517</a>                   JSON Web Key (JWK)                   May 2015</span>


<span class="h2"><a class="selflink" id="appendix-B" href="#appendix-B">Appendix B</a>.  Example Use of "x5c" (X.509 Certificate Chain) Parameter</span>

   The following is an example of a JWK with a RSA signing key
   represented both as an RSA public key and as an X.509 certificate
   using the "x5c" parameter (with line breaks within values for display
   purposes only):

     {"kty":"RSA",
      "use":"sig",
      "kid":"1b94c",
      "n":"vrjOfz9Ccdgx5nQudyhdoR17V-IubWMeOZCwX_jj0hgAsz2J_pqYW08
      PLbK_PdiVGKPrqzmDIsLI7sA25VEnHU1uCLNwBuUiCO11_-7dYbsr4iJmG0Q
      u2j8DsVyT1azpJC_NG84Ty5KKthuCaPod7iI7w0LK9orSMhBEwwZDCxTWq4a
      YWAchc8t-emd9qOvWtVMDC2BXksRngh6X5bUYLy6AyHKvj-nUy1wgzjYQDwH
      MTplCoLtU-o-8SNnZ1tmRoGE9uJkBLdh5gFENabWnU5m1ZqZPdwS-qo-meMv
      VfJb6jJVWRpl2SUtCnYG2C32qvbWbjZ_jBPD5eunqsIo1vQ",
      "e":"AQAB",
      "x5c":
       ["MIIDQjCCAiqgAwIBAgIGATz/FuLiMA0GCSqGSIb3DQEBBQUAMGIxCzAJB
       gNVBAYTAlVTMQswCQYDVQQIEwJDTzEPMA0GA1UEBxMGRGVudmVyMRwwGgYD
       VQQKExNQaW5nIElkZW50aXR5IENvcnAuMRcwFQYDVQQDEw5CcmlhbiBDYW1
       wYmVsbDAeFw0xMzAyMjEyMzI5MTVaFw0xODA4MTQyMjI5MTVaMGIxCzAJBg
       NVBAYTAlVTMQswCQYDVQQIEwJDTzEPMA0GA1UEBxMGRGVudmVyMRwwGgYDV
       QQKExNQaW5nIElkZW50aXR5IENvcnAuMRcwFQYDVQQDEw5CcmlhbiBDYW1w
       YmVsbDCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAL64zn8/QnH
       YMeZ0LncoXaEde1fiLm1jHjmQsF/449IYALM9if6amFtPDy2yvz3YlRij66
       s5gyLCyO7ANuVRJx1NbgizcAblIgjtdf/u3WG7K+IiZhtELto/A7Fck9Ws6
       SQvzRvOE8uSirYbgmj6He4iO8NCyvaK0jIQRMMGQwsU1quGmFgHIXPLfnpn
       fajr1rVTAwtgV5LEZ4Iel+W1GC8ugMhyr4/p1MtcIM42EA8BzE6ZQqC7VPq
       PvEjZ2dbZkaBhPbiZAS3YeYBRDWm1p1OZtWamT3cEvqqPpnjL1XyW+oyVVk
       aZdklLQp2Btgt9qr21m42f4wTw+Xrp6rCKNb0CAwEAATANBgkqhkiG9w0BA
       QUFAAOCAQEAh8zGlfSlcI0o3rYDPBB07aXNswb4ECNIKG0CETTUxmXl9KUL
       +9gGlqCz5iWLOgWsnrcKcY0vXPG9J1r9AqBNTqNgHq2G03X09266X5CpOe1
       zFo+Owb1zxtp3PehFdfQJ610CDLEaS9V9Rqp17hCyybEpOGVwe8fnk+fbEL
       2Bo3UPGrpsHzUoaGpDftmWssZkhpBJKVMJyf/RuP2SmmaIzmnw9JiSlYhzo
       4tpzd5rFXhjRbg4zW9C+2qok+2+qDM1iJ684gPHMIY8aLWrdgQTxkumGmTq
       gawR+N5MDtdPTEQ0XfIBc2cJEUyMTY5MPvACWpkA6SdS4xSvdXK3IVfOWA=="]
     }

<span class="h2"><a class="selflink" id="appendix-C" href="#appendix-C">Appendix C</a>.  Example Encrypted RSA Private Key</span>

   This example encrypts an RSA private key to the recipient using
   "PBES2-HS256+A128KW" for key encryption and "A128CBC+HS256" for
   content encryption.

   NOTE: Unless otherwise indicated, all line breaks are included solely
   for readability.




<span class="grey">Jones                        Standards Track                   [Page 28]</span></pre>
<hr class='noprint'/><!--NewPage--><pre class='newpage'><span id="page-29" ></span>
<span class="grey"><a href="./rfc7517">RFC 7517</a>                   JSON Web Key (JWK)                   May 2015</span>


<span class="h3"><a class="selflink" id="appendix-C.1" href="#appendix-C.1">C.1</a>.  Plaintext RSA Private Key</span>

   The following RSA key is the plaintext for the authenticated
   encryption operation, formatted as a JWK (with line breaks within
   values for display purposes only):

     {
      "kty":"RSA",
      "kid":"juliet@capulet.lit",
      "use":"enc",
      "n":"t6Q8PWSi1dkJj9hTP8hNYFlvadM7DflW9mWepOJhJ66w7nyoK1gPNqFMSQRy
           O125Gp-TEkodhWr0iujjHVx7BcV0llS4w5ACGgPrcAd6ZcSR0-Iqom-QFcNP
           8Sjg086MwoqQU_LYywlAGZ21WSdS_PERyGFiNnj3QQlO8Yns5jCtLCRwLHL0
           Pb1fEv45AuRIuUfVcPySBWYnDyGxvjYGDSM-AqWS9zIQ2ZilgT-GqUmipg0X
           OC0Cc20rgLe2ymLHjpHciCKVAbY5-L32-lSeZO-Os6U15_aXrk9Gw8cPUaX1
           _I8sLGuSiVdt3C_Fn2PZ3Z8i744FPFGGcG1qs2Wz-Q",
      "e":"AQAB",
      "d":"GRtbIQmhOZtyszfgKdg4u_N-R_mZGU_9k7JQ_jn1DnfTuMdSNprTeaSTyWfS
           NkuaAwnOEbIQVy1IQbWVV25NY3ybc_IhUJtfri7bAXYEReWaCl3hdlPKXy9U
           vqPYGR0kIXTQRqns-dVJ7jahlI7LyckrpTmrM8dWBo4_PMaenNnPiQgO0xnu
           ToxutRZJfJvG4Ox4ka3GORQd9CsCZ2vsUDmsXOfUENOyMqADC6p1M3h33tsu
           rY15k9qMSpG9OX_IJAXmxzAh_tWiZOwk2K4yxH9tS3Lq1yX8C1EWmeRDkK2a
           hecG85-oLKQt5VEpWHKmjOi_gJSdSgqcN96X52esAQ",
      "p":"2rnSOV4hKSN8sS4CgcQHFbs08XboFDqKum3sc4h3GRxrTmQdl1ZK9uw-PIHf
           QP0FkxXVrx-WE-ZEbrqivH_2iCLUS7wAl6XvARt1KkIaUxPPSYB9yk31s0Q8
           UK96E3_OrADAYtAJs-M3JxCLfNgqh56HDnETTQhH3rCT5T3yJws",
      "q":"1u_RiFDP7LBYh3N4GXLT9OpSKYP0uQZyiaZwBtOCBNJgQxaj10RWjsZu0c6I
           edis4S7B_coSKB0Kj9PaPaBzg-IySRvvcQuPamQu66riMhjVtG6TlV8CLCYK
           rYl52ziqK0E_ym2QnkwsUX7eYTB7LbAHRK9GqocDE5B0f808I4s",
      "dp":"KkMTWqBUefVwZ2_Dbj1pPQqyHSHjj90L5x_MOzqYAJMcLMZtbUtwKqvVDq3
           tbEo3ZIcohbDtt6SbfmWzggabpQxNxuBpoOOf_a_HgMXK_lhqigI4y_kqS1w
           Y52IwjUn5rgRrJ-yYo1h41KR-vz2pYhEAeYrhttWtxVqLCRViD6c",
      "dq":"AvfS0-gRxvn0bwJoMSnFxYcK1WnuEjQFluMGfwGitQBWtfZ1Er7t1xDkbN9
           GQTB9yqpDoYaN06H7CFtrkxhJIBQaj6nkF5KKS3TQtQ5qCzkOkmxIe3KRbBy
           mXxkb5qwUpX5ELD5xFc6FeiafWYY63TmmEAu_lRFCOJ3xDea-ots",
      "qi":"lSQi-w9CpyUReMErP1RsBLk7wNtOvs5EQpPqmuMvqW57NBUczScEoPwmUqq
           abu9V0-Py4dQ57_bapoKRu1R90bvuFnU63SHWEFglZQvJDMeAvmj4sm-Fp0o
           Yu_neotgQ0hzbI5gry7ajdYy9-2lNx_76aBZoOUu9HCJ-UsfSOI8"
     }

   The octets representing the plaintext used in this example (using
   JSON array notation) are:

   [123, 34, 107, 116, 121, 34, 58, 34, 82, 83, 65, 34, 44, 34, 107,
   105, 100, 34, 58, 34, 106, 117, 108, 105, 101, 116, 64, 99, 97, 112,
   117, 108, 101, 116, 46, 108, 105, 116, 34, 44, 34, 117, 115, 101, 34,
   58, 34, 101, 110, 99, 34, 44, 34, 110, 34, 58, 34, 116, 54, 81, 56,
   80, 87, 83, 105, 49, 100, 107, 74, 106, 57, 104, 84, 80, 56, 104, 78,



<span class="grey">Jones                        Standards Track                   [Page 29]</span></pre>
<hr class='noprint'/><!--NewPage--><pre class='newpage'><span id="page-30" ></span>
<span class="grey"><a href="./rfc7517">RFC 7517</a>                   JSON Web Key (JWK)                   May 2015</span>


   89, 70, 108, 118, 97, 100, 77, 55, 68, 102, 108, 87, 57, 109, 87,
   101, 112, 79, 74, 104, 74, 54, 54, 119, 55, 110, 121, 111, 75, 49,
   103, 80, 78, 113, 70, 77, 83, 81, 82, 121, 79, 49, 50, 53, 71, 112,
   45, 84, 69, 107, 111, 100, 104, 87, 114, 48, 105, 117, 106, 106, 72,
   86, 120, 55, 66, 99, 86, 48, 108, 108, 83, 52, 119, 53, 65, 67, 71,
   103, 80, 114, 99, 65, 100, 54, 90, 99, 83, 82, 48, 45, 73, 113, 111,
   109, 45, 81, 70, 99, 78, 80, 56, 83, 106, 103, 48, 56, 54, 77, 119,
   111, 113, 81, 85, 95, 76, 89, 121, 119, 108, 65, 71, 90, 50, 49, 87,
   83, 100, 83, 95, 80, 69, 82, 121, 71, 70, 105, 78, 110, 106, 51, 81,
   81, 108, 79, 56, 89, 110, 115, 53, 106, 67, 116, 76, 67, 82, 119, 76,
   72, 76, 48, 80, 98, 49, 102, 69, 118, 52, 53, 65, 117, 82, 73, 117,
   85, 102, 86, 99, 80, 121, 83, 66, 87, 89, 110, 68, 121, 71, 120, 118,
   106, 89, 71, 68, 83, 77, 45, 65, 113, 87, 83, 57, 122, 73, 81, 50,
   90, 105, 108, 103, 84, 45, 71, 113, 85, 109, 105, 112, 103, 48, 88,
   79, 67, 48, 67, 99, 50, 48, 114, 103, 76, 101, 50, 121, 109, 76, 72,
   106, 112, 72, 99, 105, 67, 75, 86, 65, 98, 89, 53, 45, 76, 51, 50,
   45, 108, 83, 101, 90, 79, 45, 79, 115, 54, 85, 49, 53, 95, 97, 88,
   114, 107, 57, 71, 119, 56, 99, 80, 85, 97, 88, 49, 95, 73, 56, 115,
   76, 71, 117, 83, 105, 86, 100, 116, 51, 67, 95, 70, 110, 50, 80, 90,
   51, 90, 56, 105, 55, 52, 52, 70, 80, 70, 71, 71, 99, 71, 49, 113,
   115, 50, 87, 122, 45, 81, 34, 44, 34, 101, 34, 58, 34, 65, 81, 65,
   66, 34, 44, 34, 100, 34, 58, 34, 71, 82, 116, 98, 73, 81, 109, 104,
   79, 90, 116, 121, 115, 122, 102, 103, 75, 100, 103, 52, 117, 95, 78,
   45, 82, 95, 109, 90, 71, 85, 95, 57, 107, 55, 74, 81, 95, 106, 110,
   49, 68, 110, 102, 84, 117, 77, 100, 83, 78, 112, 114, 84, 101, 97,
   83, 84, 121, 87, 102, 83, 78, 107, 117, 97, 65, 119, 110, 79, 69, 98,
   73, 81, 86, 121, 49, 73, 81, 98, 87, 86, 86, 50, 53, 78, 89, 51, 121,
   98, 99, 95, 73, 104, 85, 74, 116, 102, 114, 105, 55, 98, 65, 88, 89,
   69, 82, 101, 87, 97, 67, 108, 51, 104, 100, 108, 80, 75, 88, 121, 57,
   85, 118, 113, 80, 89, 71, 82, 48, 107, 73, 88, 84, 81, 82, 113, 110,
   115, 45, 100, 86, 74, 55, 106, 97, 104, 108, 73, 55, 76, 121, 99,
   107, 114, 112, 84, 109, 114, 77, 56, 100, 87, 66, 111, 52, 95, 80,
   77, 97, 101, 110, 78, 110, 80, 105, 81, 103, 79, 48, 120, 110, 117,
   84, 111, 120, 117, 116, 82, 90, 74, 102, 74, 118, 71, 52, 79, 120,
   52, 107, 97, 51, 71, 79, 82, 81, 100, 57, 67, 115, 67, 90, 50, 118,
   115, 85, 68, 109, 115, 88, 79, 102, 85, 69, 78, 79, 121, 77, 113, 65,
   68, 67, 54, 112, 49, 77, 51, 104, 51, 51, 116, 115, 117, 114, 89, 49,
   53, 107, 57, 113, 77, 83, 112, 71, 57, 79, 88, 95, 73, 74, 65, 88,
   109, 120, 122, 65, 104, 95, 116, 87, 105, 90, 79, 119, 107, 50, 75,
   52, 121, 120, 72, 57, 116, 83, 51, 76, 113, 49, 121, 88, 56, 67, 49,
   69, 87, 109, 101, 82, 68, 107, 75, 50, 97, 104, 101, 99, 71, 56, 53,
   45, 111, 76, 75, 81, 116, 53, 86, 69, 112, 87, 72, 75, 109, 106, 79,
   105, 95, 103, 74, 83, 100, 83, 103, 113, 99, 78, 57, 54, 88, 53, 50,
   101, 115, 65, 81, 34, 44, 34, 112, 34, 58, 34, 50, 114, 110, 83, 79,
   86, 52, 104, 75, 83, 78, 56, 115, 83, 52, 67, 103, 99, 81, 72, 70,
   98, 115, 48, 56, 88, 98, 111, 70, 68, 113, 75, 117, 109, 51, 115, 99,
   52, 104, 51, 71, 82, 120, 114, 84, 109, 81, 100, 108, 49, 90, 75, 57,
   117, 119, 45, 80, 73, 72, 102, 81, 80, 48, 70, 107, 120, 88, 86, 114,



<span class="grey">Jones                        Standards Track                   [Page 30]</span></pre>
<hr class='noprint'/><!--NewPage--><pre class='newpage'><span id="page-31" ></span>
<span class="grey"><a href="./rfc7517">RFC 7517</a>                   JSON Web Key (JWK)                   May 2015</span>


   120, 45, 87, 69, 45, 90, 69, 98, 114, 113, 105, 118, 72, 95, 50, 105,
   67, 76, 85, 83, 55, 119, 65, 108, 54, 88, 118, 65, 82, 116, 49, 75,
   107, 73, 97, 85, 120, 80, 80, 83, 89, 66, 57, 121, 107, 51, 49, 115,
   48, 81, 56, 85, 75, 57, 54, 69, 51, 95, 79, 114, 65, 68, 65, 89, 116,
   65, 74, 115, 45, 77, 51, 74, 120, 67, 76, 102, 78, 103, 113, 104, 53,
   54, 72, 68, 110, 69, 84, 84, 81, 104, 72, 51, 114, 67, 84, 53, 84,
   51, 121, 74, 119, 115, 34, 44, 34, 113, 34, 58, 34, 49, 117, 95, 82,
   105, 70, 68, 80, 55, 76, 66, 89, 104, 51, 78, 52, 71, 88, 76, 84, 57,
   79, 112, 83, 75, 89, 80, 48, 117, 81, 90, 121, 105, 97, 90, 119, 66,
   116, 79, 67, 66, 78, 74, 103, 81, 120, 97, 106, 49, 48, 82, 87, 106,
   115, 90, 117, 48, 99, 54, 73, 101, 100, 105, 115, 52, 83, 55, 66, 95,
   99, 111, 83, 75, 66, 48, 75, 106, 57, 80, 97, 80, 97, 66, 122, 103,
   45, 73, 121, 83, 82, 118, 118, 99, 81, 117, 80, 97, 109, 81, 117, 54,
   54, 114, 105, 77, 104, 106, 86, 116, 71, 54, 84, 108, 86, 56, 67, 76,
   67, 89, 75, 114, 89, 108, 53, 50, 122, 105, 113, 75, 48, 69, 95, 121,
   109, 50, 81, 110, 107, 119, 115, 85, 88, 55, 101, 89, 84, 66, 55, 76,
   98, 65, 72, 82, 75, 57, 71, 113, 111, 99, 68, 69, 53, 66, 48, 102,
   56, 48, 56, 73, 52, 115, 34, 44, 34, 100, 112, 34, 58, 34, 75, 107,
   77, 84, 87, 113, 66, 85, 101, 102, 86, 119, 90, 50, 95, 68, 98, 106,
   49, 112, 80, 81, 113, 121, 72, 83, 72, 106, 106, 57, 48, 76, 53, 120,
   95, 77, 79, 122, 113, 89, 65, 74, 77, 99, 76, 77, 90, 116, 98, 85,
   116, 119, 75, 113, 118, 86, 68, 113, 51, 116, 98, 69, 111, 51, 90,
   73, 99, 111, 104, 98, 68, 116, 116, 54, 83, 98, 102, 109, 87, 122,
   103, 103, 97, 98, 112, 81, 120, 78, 120, 117, 66, 112, 111, 79, 79,
   102, 95, 97, 95, 72, 103, 77, 88, 75, 95, 108, 104, 113, 105, 103,
   73, 52, 121, 95, 107, 113, 83, 49, 119, 89, 53, 50, 73, 119, 106, 85,
   110, 53, 114, 103, 82, 114, 74, 45, 121, 89, 111, 49, 104, 52, 49,
   75, 82, 45, 118, 122, 50, 112, 89, 104, 69, 65, 101, 89, 114, 104,
   116, 116, 87, 116, 120, 86, 113, 76, 67, 82, 86, 105, 68, 54, 99, 34,
   44, 34, 100, 113, 34, 58, 34, 65, 118, 102, 83, 48, 45, 103, 82, 120,
   118, 110, 48, 98, 119, 74, 111, 77, 83, 110, 70, 120, 89, 99, 75, 49,
   87, 110, 117, 69, 106, 81, 70, 108, 117, 77, 71, 102, 119, 71, 105,
   116, 81, 66, 87, 116, 102, 90, 49, 69, 114, 55, 116, 49, 120, 68,
   107, 98, 78, 57, 71, 81, 84, 66, 57, 121, 113, 112, 68, 111, 89, 97,
   78, 48, 54, 72, 55, 67, 70, 116, 114, 107, 120, 104, 74, 73, 66, 81,
   97, 106, 54, 110, 107, 70, 53, 75, 75, 83, 51, 84, 81, 116, 81, 53,
   113, 67, 122, 107, 79, 107, 109, 120, 73, 101, 51, 75, 82, 98, 66,
   121, 109, 88, 120, 107, 98, 53, 113, 119, 85, 112, 88, 53, 69, 76,
   68, 53, 120, 70, 99, 54, 70, 101, 105, 97, 102, 87, 89, 89, 54, 51,
   84, 109, 109, 69, 65, 117, 95, 108, 82, 70, 67, 79, 74, 51, 120, 68,
   101, 97, 45, 111, 116, 115, 34, 44, 34, 113, 105, 34, 58, 34, 108,
   83, 81, 105, 45, 119, 57, 67, 112, 121, 85, 82, 101, 77, 69, 114, 80,
   49, 82, 115, 66, 76, 107, 55, 119, 78, 116, 79, 118, 115, 53, 69, 81,
   112, 80, 113, 109, 117, 77, 118, 113, 87, 53, 55, 78, 66, 85, 99,
   122, 83, 99, 69, 111, 80, 119, 109, 85, 113, 113, 97, 98, 117, 57,
   86, 48, 45, 80, 121, 52, 100, 81, 53, 55, 95, 98, 97, 112, 111, 75,
   82, 117, 49, 82, 57, 48, 98, 118, 117, 70, 110, 85, 54, 51, 83, 72,
   87, 69, 70, 103, 108, 90, 81, 118, 74, 68, 77, 101, 65, 118, 109,



<span class="grey">Jones                        Standards Track                   [Page 31]</span></pre>
<hr class='noprint'/><!--NewPage--><pre class='newpage'><span id="page-32" ></span>
<span class="grey"><a href="./rfc7517">RFC 7517</a>                   JSON Web Key (JWK)                   May 2015</span>


   106, 52, 115, 109, 45, 70, 112, 48, 111, 89, 117, 95, 110, 101, 111,
   116, 103, 81, 48, 104, 122, 98, 73, 53, 103, 114, 121, 55, 97, 106,
   100, 89, 121, 57, 45, 50, 108, 78, 120, 95, 55, 54, 97, 66, 90, 111,
   79, 85, 117, 57, 72, 67, 74, 45, 85, 115, 102, 83, 79, 73, 56, 34,
   125]

<span class="h3"><a class="selflink" id="appendix-C.2" href="#appendix-C.2">C.2</a>.  JOSE Header</span>

   The following example JWE Protected Header declares that:

   o  the Content Encryption Key is encrypted to the recipient using the
      PSE2-HS256+A128KW algorithm to produce the JWE Encrypted Key,

   o  the Salt Input ("p2s") value is [217, 96, 147, 112, 150, 117, 70,
      247, 127, 8, 155, 137, 174, 42, 80, 215],

   o  the Iteration Count ("p2c") value is 4096,

   o  authenticated encryption is performed on the plaintext using the
      AES_128_CBC_HMAC_SHA_256 algorithm to produce the ciphertext and
      the Authentication Tag, and

   o  the content type is application/jwk+json.

     {
      "alg":"PBES2-HS256+A128KW",
      "p2s":"2WCTcJZ1Rvd_CJuJripQ1w",
      "p2c":4096,
      "enc":"A128CBC-HS256",
      "cty":"jwk+json"
     }

   Encoding this JWE Protected Header as BASE64URL(UTF8(JWE Protected
   Header)) gives this value (with line breaks for display purposes
   only):

     eyJhbGciOiJQQkVTMi1IUzI1NitBMTI4S1ciLCJwMnMiOiIyV0NUY0paMVJ2ZF9DSn
     VKcmlwUTF3IiwicDJjIjo0MDk2LCJlbmMiOiJBMTI4Q0JDLUhTMjU2IiwiY3R5Ijoi
     andrK2pzb24ifQ

<span class="h3"><a class="selflink" id="appendix-C.3" href="#appendix-C.3">C.3</a>.  Content Encryption Key (CEK)</span>

   Generate a 256-bit random Content Encryption Key (CEK).  In this
   example, the value (using JSON array notation) is:

   [111, 27, 25, 52, 66, 29, 20, 78, 92, 176, 56, 240, 65, 208, 82, 112,
   161, 131, 36, 55, 202, 236, 185, 172, 129, 23, 153, 194, 195, 48,
   253, 182]



<span class="grey">Jones                        Standards Track                   [Page 32]</span></pre>
<hr class='noprint'/><!--NewPage--><pre class='newpage'><span id="page-33" ></span>
<span class="grey"><a href="./rfc7517">RFC 7517</a>                   JSON Web Key (JWK)                   May 2015</span>


<span class="h3"><a class="selflink" id="appendix-C.4" href="#appendix-C.4">C.4</a>.  Key Derivation</span>

   Derive a key from a shared passphrase using the PBKDF2 algorithm with
   HMAC SHA-256 and the specified Salt and Iteration Count values and a
   128-bit requested output key size to produce the PBKDF2 Derived Key.
   This example uses the following passphrase:

     Thus from my lips, by yours, my sin is purged.

   The octets representing the passphrase are:

   [84, 104, 117, 115, 32, 102, 114, 111, 109, 32, 109, 121, 32, 108,
   105, 112, 115, 44, 32, 98, 121, 32, 121, 111, 117, 114, 115, 44, 32,
   109, 121, 32, 115, 105, 110, 32, 105, 115, 32, 112, 117, 114, 103,
   101, 100, 46]

   The Salt value (UTF8(Alg) || 0x00 || Salt Input) is:

   [80, 66, 69, 83, 50, 45, 72, 83, 50, 53, 54, 43, 65, 49, 50, 56, 75,
   87, 0, 217, 96, 147, 112, 150, 117, 70, 247, 127, 8, 155, 137, 174,
   42, 80, 215].

   The resulting PBKDF2 Derived Key value is:

   [110, 171, 169, 92, 129, 92, 109, 117, 233, 242, 116, 233, 170, 14,
   24, 75]

<span class="h3"><a class="selflink" id="appendix-C.5" href="#appendix-C.5">C.5</a>.  Key Encryption</span>

   Encrypt the CEK with the "A128KW" algorithm using the PBKDF2 Derived
   Key.  The resulting JWE Encrypted Key value is:

   [78, 186, 151, 59, 11, 141, 81, 240, 213, 245, 83, 211, 53, 188, 134,
   188, 66, 125, 36, 200, 222, 124, 5, 103, 249, 52, 117, 184, 140, 81,
   246, 158, 161, 177, 20, 33, 245, 57, 59, 4]

   Encoding this JWE Encrypted Key as BASE64URL(JWE Encrypted Key) gives
   this value:

     TrqXOwuNUfDV9VPTNbyGvEJ9JMjefAVn-TR1uIxR9p6hsRQh9Tk7BA

<span class="h3"><a class="selflink" id="appendix-C.6" href="#appendix-C.6">C.6</a>.  Initialization Vector</span>

   Generate a random 128-bit JWE Initialization Vector.  In this
   example, the value is:

   [97, 239, 99, 214, 171, 54, 216, 57, 145, 72, 7, 93, 34, 31, 149,
   156]



<span class="grey">Jones                        Standards Track                   [Page 33]</span></pre>
<hr class='noprint'/><!--NewPage--><pre class='newpage'><span id="page-34" ></span>
<span class="grey"><a href="./rfc7517">RFC 7517</a>                   JSON Web Key (JWK)                   May 2015</span>


   Encoding this JWE Initialization Vector as BASE64URL(JWE
   Initialization Vector) gives this value:

     Ye9j1qs22DmRSAddIh-VnA

<span class="h3"><a class="selflink" id="appendix-C.7" href="#appendix-C.7">C.7</a>.  Additional Authenticated Data</span>

   Let the Additional Authenticated Data encryption parameter be
   ASCII(BASE64URL(UTF8(JWE Protected Header))).  This value is:

   [123, 34, 97, 108, 103, 34, 58, 34, 80, 66, 69, 83, 50, 45, 72, 83,
   50, 53, 54, 43, 65, 49, 50, 56, 75, 87, 34, 44, 34, 112, 50, 115, 34,
   58, 34, 50, 87, 67, 84, 99, 74, 90, 49, 82, 118, 100, 95, 67, 74,
   117, 74, 114, 105, 112, 81, 49, 119, 34, 44, 34, 112, 50, 99, 34, 58,
   52, 48, 57, 54, 44, 34, 101, 110, 99, 34, 58, 34, 65, 49, 50, 56, 67,
   66, 67, 45, 72, 83, 50, 53, 54, 34, 44, 34, 99, 116, 121, 34, 58, 34,
   106, 119, 107, 43, 106, 115, 111, 110, 34, 125]

<span class="h3"><a class="selflink" id="appendix-C.8" href="#appendix-C.8">C.8</a>.  Content Encryption</span>

   Perform authenticated encryption on the plaintext with the
   AES_128_CBC_HMAC_SHA_256 algorithm using the CEK as the encryption
   key, the JWE Initialization Vector, and the Additional Authenticated
   Data value above.  The resulting ciphertext is:

   [3, 8, 65, 242, 92, 107, 148, 168, 197, 159, 77, 139, 25, 97, 42,
   131, 110, 199, 225, 56, 61, 127, 38, 64, 108, 91, 247, 167, 150, 98,
   112, 122, 99, 235, 132, 50, 28, 46, 56, 170, 169, 89, 220, 145, 38,
   157, 148, 224, 66, 140, 8, 169, 146, 117, 222, 54, 242, 28, 31, 11,
   129, 227, 226, 169, 66, 117, 133, 254, 140, 216, 115, 203, 131, 60,
   60, 47, 233, 132, 121, 13, 35, 188, 53, 19, 172, 77, 59, 54, 211,
   158, 172, 25, 60, 111, 0, 80, 201, 158, 160, 210, 68, 55, 12, 67,
   136, 130, 87, 216, 197, 95, 62, 20, 155, 205, 5, 140, 27, 168, 221,
   65, 114, 78, 157, 254, 46, 206, 182, 52, 135, 87, 239, 3, 34, 186,
   126, 220, 151, 17, 33, 237, 57, 96, 172, 183, 58, 45, 248, 103, 241,
   142, 136, 7, 53, 16, 173, 181, 7, 93, 92, 252, 1, 53, 212, 242, 8,
   255, 11, 239, 181, 24, 148, 136, 111, 24, 161, 244, 23, 106, 69, 157,
   215, 243, 189, 240, 166, 169, 249, 72, 38, 201, 99, 223, 173, 229, 9,
   222, 82, 79, 157, 176, 248, 85, 239, 121, 163, 1, 31, 48, 98, 206,
   61, 249, 104, 216, 201, 227, 105, 48, 194, 193, 10, 36, 160, 159,
   241, 166, 84, 54, 188, 211, 243, 242, 40, 46, 45, 193, 193, 160, 169,
   101, 201, 1, 73, 47, 105, 142, 88, 28, 42, 132, 26, 61, 58, 63, 142,
   243, 77, 26, 179, 153, 166, 46, 203, 208, 49, 55, 229, 34, 178, 4,
   109, 180, 204, 204, 115, 1, 103, 193, 5, 91, 215, 214, 195, 1, 110,
   208, 53, 144, 36, 105, 12, 54, 25, 129, 101, 15, 183, 150, 250, 147,
   115, 227, 58, 250, 5, 128, 232, 63, 15, 14, 19, 141, 124, 253, 142,
   137, 189, 135, 26, 44, 240, 27, 88, 132, 105, 127, 6, 71, 37, 41,
   124, 187, 165, 140, 34, 200, 123, 80, 228, 24, 231, 176, 132, 171,



<span class="grey">Jones                        Standards Track                   [Page 34]</span></pre>
<hr class='noprint'/><!--NewPage--><pre class='newpage'><span id="page-35" ></span>
<span class="grey"><a href="./rfc7517">RFC 7517</a>                   JSON Web Key (JWK)                   May 2015</span>


   138, 145, 152, 116, 224, 50, 141, 51, 147, 91, 186, 7, 246, 106, 217,
   148, 244, 227, 244, 45, 220, 121, 165, 224, 148, 181, 17, 181, 128,
   197, 101, 237, 11, 169, 229, 149, 199, 78, 56, 15, 14, 190, 91, 216,
   222, 247, 213, 74, 40, 8, 96, 20, 168, 119, 96, 26, 24, 52, 37, 82,
   127, 57, 176, 147, 118, 59, 7, 224, 33, 117, 72, 155, 29, 82, 26,
   215, 189, 140, 119, 28, 152, 118, 93, 222, 194, 192, 148, 115, 83,
   253, 216, 212, 108, 88, 83, 175, 172, 220, 97, 79, 110, 42, 223, 170,
   161, 34, 164, 144, 193, 76, 122, 92, 160, 41, 178, 175, 6, 35, 96,
   113, 96, 158, 90, 129, 101, 26, 45, 70, 180, 189, 230, 15, 5, 247,
   150, 209, 94, 171, 26, 13, 142, 212, 129, 1, 176, 5, 0, 112, 203,
   174, 185, 119, 76, 233, 189, 54, 172, 189, 245, 223, 253, 205, 12,
   88, 9, 126, 157, 225, 90, 40, 229, 191, 63, 30, 160, 224, 69, 3, 140,
   109, 70, 89, 37, 213, 245, 194, 210, 180, 188, 63, 210, 139, 221, 2,
   144, 200, 20, 177, 216, 29, 227, 242, 106, 12, 135, 142, 139, 144,
   82, 225, 162, 171, 176, 108, 99, 6, 43, 193, 161, 116, 234, 216, 1,
   242, 21, 124, 162, 98, 205, 124, 193, 38, 12, 242, 90, 101, 76, 204,
   184, 124, 58, 180, 16, 240, 26, 76, 195, 250, 212, 191, 185, 191, 97,
   198, 186, 73, 225, 75, 14, 90, 123, 121, 172, 101, 50, 160, 221, 141,
   253, 205, 126, 77, 9, 87, 198, 110, 104, 182, 141, 120, 51, 25, 232,
   3, 32, 80, 6, 156, 8, 18, 4, 135, 221, 142, 25, 135, 2, 129, 132,
   115, 227, 74, 141, 28, 119, 11, 141, 117, 134, 198, 62, 150, 254, 97,
   75, 197, 251, 99, 89, 204, 224, 226, 67, 83, 175, 89, 0, 81, 29, 38,
   207, 89, 140, 255, 197, 177, 164, 128, 62, 116, 224, 180, 109, 169,
   28, 2, 59, 176, 130, 252, 44, 178, 81, 24, 181, 176, 75, 44, 61, 91,
   12, 37, 21, 255, 83, 130, 197, 16, 231, 60, 217, 56, 131, 118, 168,
   202, 58, 52, 84, 124, 162, 185, 174, 162, 226, 242, 112, 68, 246,
   202, 16, 208, 52, 154, 58, 129, 80, 102, 33, 171, 6, 186, 177, 14,
   195, 88, 136, 6, 0, 155, 28, 100, 162, 207, 162, 222, 117, 248, 170,
   208, 114, 87, 31, 57, 176, 33, 57, 83, 253, 12, 168, 110, 194, 59,
   22, 86, 48, 227, 196, 22, 176, 218, 122, 149, 21, 249, 195, 178, 174,
   250, 20, 34, 120, 60, 139, 201, 99, 40, 18, 177, 17, 54, 54, 6, 3,
   222, 128, 160, 88, 11, 27, 0, 81, 192, 36, 41, 169, 146, 8, 47, 64,
   136, 28, 64, 209, 67, 135, 202, 20, 234, 182, 91, 204, 146, 195, 187,
   0, 72, 77, 11, 111, 152, 204, 252, 177, 212, 89, 33, 50, 132, 184,
   44, 183, 186, 19, 250, 69, 176, 201, 102, 140, 14, 143, 212, 212,
   160, 123, 208, 185, 27, 155, 68, 77, 133, 198, 2, 126, 155, 215, 22,
   91, 30, 217, 176, 172, 244, 156, 174, 143, 75, 90, 21, 102, 1, 160,
   59, 253, 188, 88, 57, 185, 197, 83, 24, 22, 180, 174, 47, 207, 52, 1,
   141, 146, 119, 233, 68, 228, 224, 228, 193, 248, 155, 202, 90, 7,
   213, 88, 33, 108, 107, 14, 86, 8, 120, 250, 58, 142, 35, 164, 238,
   221, 219, 35, 123, 88, 199, 192, 143, 104, 83, 17, 166, 243, 247, 11,
   166, 67, 68, 204, 132, 23, 110, 103, 228, 14, 55, 122, 88, 57, 180,
   178, 237, 52, 130, 214, 245, 102, 123, 67, 73, 175, 1, 127, 112, 148,
   94, 132, 164, 197, 153, 217, 87, 25, 89, 93, 63, 22, 66, 166, 90,
   251, 101, 10, 145, 66, 17, 124, 36, 255, 165, 226, 97, 16, 86, 112,
   154, 88, 105, 253, 56, 209, 229, 122, 103, 51, 24, 228, 190, 3, 236,
   48, 182, 121, 176, 140, 128, 117, 87, 251, 224, 37, 23, 248, 21, 218,
   85, 251, 136, 84, 147, 143, 144, 46, 155, 183, 251, 89, 86, 23, 26,



<span class="grey">Jones                        Standards Track                   [Page 35]</span></pre>
<hr class='noprint'/><!--NewPage--><pre class='newpage'><span id="page-36" ></span>
<span class="grey"><a href="./rfc7517">RFC 7517</a>                   JSON Web Key (JWK)                   May 2015</span>


   237, 100, 167, 32, 130, 173, 237, 89, 55, 110, 70, 142, 127, 65, 230,
   208, 109, 69, 19, 253, 84, 130, 130, 193, 92, 58, 108, 150, 42, 136,
   249, 234, 86, 241, 182, 19, 117, 246, 26, 181, 92, 101, 155, 44, 103,
   235, 173, 30, 140, 90, 29, 183, 190, 77, 53, 206, 127, 5, 87, 8, 187,
   184, 92, 4, 157, 22, 18, 105, 251, 39, 88, 182, 181, 103, 148, 233,
   6, 63, 70, 188, 7, 101, 216, 127, 77, 31, 12, 233, 7, 147, 106, 30,
   150, 77, 145, 13, 205, 48, 56, 245, 220, 89, 252, 127, 51, 180, 36,
   31, 55, 18, 214, 230, 254, 217, 197, 65, 247, 27, 215, 117, 247, 108,
   157, 121, 11, 63, 150, 195, 83, 6, 134, 242, 41, 24, 105, 204, 5, 63,
   192, 14, 159, 113, 72, 140, 128, 51, 215, 80, 215, 39, 149, 94, 79,
   128, 34, 5, 129, 82, 83, 121, 187, 37, 146, 27, 32, 177, 167, 71, 9,
   195, 30, 199, 196, 205, 252, 207, 69, 8, 120, 27, 190, 51, 43, 75,
   249, 234, 167, 116, 206, 203, 199, 43, 108, 87, 48, 155, 140, 228,
   210, 85, 25, 161, 96, 67, 8, 205, 64, 39, 75, 88, 44, 238, 227, 16,
   0, 100, 93, 129, 18, 4, 149, 50, 68, 72, 99, 35, 111, 254, 27, 102,
   175, 108, 233, 87, 181, 44, 169, 18, 139, 79, 208, 14, 202, 192, 5,
   162, 222, 231, 149, 24, 211, 49, 120, 101, 39, 206, 87, 147, 204,
   200, 251, 104, 115, 5, 127, 117, 195, 79, 151, 18, 224, 52, 0, 245,
   4, 85, 255, 103, 217, 0, 116, 198, 80, 91, 167, 192, 154, 199, 197,
   149, 237, 51, 2, 131, 30, 226, 95, 105, 48, 68, 135, 208, 144, 120,
   176, 145, 157, 8, 171, 80, 94, 61, 92, 92, 220, 157, 13, 138, 51, 23,
   185, 124, 31, 77, 1, 87, 241, 43, 239, 55, 122, 86, 210, 48, 208,
   204, 112, 144, 80, 147, 106, 219, 47, 253, 31, 134, 176, 16, 135,
   219, 95, 17, 129, 83, 236, 125, 136, 112, 86, 228, 252, 71, 129, 218,
   174, 156, 236, 12, 27, 159, 11, 138, 252, 253, 207, 31, 115, 214,
   118, 239, 203, 16, 211, 205, 99, 22, 51, 163, 107, 162, 246, 199, 67,
   127, 34, 108, 197, 53, 117, 58, 199, 3, 190, 74, 70, 190, 65, 235,
   175, 97, 157, 215, 252, 189, 245, 100, 229, 248, 46, 90, 126, 237, 4,
   159, 128, 58, 7, 156, 236, 69, 191, 85, 240, 179, 224, 249, 152, 49,
   195, 223, 60, 78, 186, 157, 155, 217, 58, 105, 116, 164, 217, 111,
   215, 150, 218, 252, 84, 86, 248, 140, 240, 226, 61, 106, 208, 95, 60,
   163, 6, 0, 235, 253, 162, 96, 62, 234, 251, 249, 35, 21, 7, 211, 233,
   86, 50, 33, 203, 67, 248, 60, 190, 123, 48, 167, 226, 90, 191, 71,
   56, 183, 165, 17, 85, 76, 238, 140, 211, 168, 53, 223, 194, 4, 97,
   149, 156, 120, 137, 76, 33, 229, 243, 194, 208, 198, 202, 139, 28,
   114, 46, 224, 92, 254, 83, 100, 134, 158, 92, 70, 78, 61, 62, 138,
   24, 173, 216, 66, 198, 70, 254, 47, 59, 193, 53, 6, 139, 19, 153,
   253, 28, 199, 122, 160, 27, 67, 234, 209, 227, 139, 4, 50, 7, 178,
   183, 89, 252, 32, 128, 137, 55, 52, 29, 89, 12, 111, 42, 181, 51,
   170, 132, 132, 207, 170, 228, 254, 178, 213, 0, 136, 175, 8]

   The resulting Authentication Tag value is:

   [208, 113, 102, 132, 236, 236, 67, 223, 39, 53, 98, 99, 32, 121, 17,
   236]






<span class="grey">Jones                        Standards Track                   [Page 36]</span></pre>
<hr class='noprint'/><!--NewPage--><pre class='newpage'><span id="page-37" ></span>
<span class="grey"><a href="./rfc7517">RFC 7517</a>                   JSON Web Key (JWK)                   May 2015</span>


   Encoding this JWE Ciphertext as BASE64URL(JWE Ciphertext) gives this
   value (with line breaks for display purposes only):

     AwhB8lxrlKjFn02LGWEqg27H4Tg9fyZAbFv3p5ZicHpj64QyHC44qqlZ3JEmnZTgQo
     wIqZJ13jbyHB8LgePiqUJ1hf6M2HPLgzw8L-mEeQ0jvDUTrE07NtOerBk8bwBQyZ6g
     0kQ3DEOIglfYxV8-FJvNBYwbqN1Bck6d_i7OtjSHV-8DIrp-3JcRIe05YKy3Oi34Z_
     GOiAc1EK21B11c_AE11PII_wvvtRiUiG8YofQXakWd1_O98Kap-UgmyWPfreUJ3lJP
     nbD4Ve95owEfMGLOPflo2MnjaTDCwQokoJ_xplQ2vNPz8iguLcHBoKllyQFJL2mOWB
     wqhBo9Oj-O800as5mmLsvQMTflIrIEbbTMzHMBZ8EFW9fWwwFu0DWQJGkMNhmBZQ-3
     lvqTc-M6-gWA6D8PDhONfP2Oib2HGizwG1iEaX8GRyUpfLuljCLIe1DkGOewhKuKkZ
     h04DKNM5Nbugf2atmU9OP0Ldx5peCUtRG1gMVl7Qup5ZXHTjgPDr5b2N731UooCGAU
     qHdgGhg0JVJ_ObCTdjsH4CF1SJsdUhrXvYx3HJh2Xd7CwJRzU_3Y1GxYU6-s3GFPbi
     rfqqEipJDBTHpcoCmyrwYjYHFgnlqBZRotRrS95g8F95bRXqsaDY7UgQGwBQBwy665
     d0zpvTasvfXf_c0MWAl-neFaKOW_Px6g4EUDjG1GWSXV9cLStLw_0ovdApDIFLHYHe
     PyagyHjouQUuGiq7BsYwYrwaF06tgB8hV8omLNfMEmDPJaZUzMuHw6tBDwGkzD-tS_
     ub9hxrpJ4UsOWnt5rGUyoN2N_c1-TQlXxm5oto14MxnoAyBQBpwIEgSH3Y4ZhwKBhH
     PjSo0cdwuNdYbGPpb-YUvF-2NZzODiQ1OvWQBRHSbPWYz_xbGkgD504LRtqRwCO7CC
     _CyyURi1sEssPVsMJRX_U4LFEOc82TiDdqjKOjRUfKK5rqLi8nBE9soQ0DSaOoFQZi
     GrBrqxDsNYiAYAmxxkos-i3nX4qtByVx85sCE5U_0MqG7COxZWMOPEFrDaepUV-cOy
     rvoUIng8i8ljKBKxETY2BgPegKBYCxsAUcAkKamSCC9AiBxA0UOHyhTqtlvMksO7AE
     hNC2-YzPyx1FkhMoS4LLe6E_pFsMlmjA6P1NSge9C5G5tETYXGAn6b1xZbHtmwrPSc
     ro9LWhVmAaA7_bxYObnFUxgWtK4vzzQBjZJ36UTk4OTB-JvKWgfVWCFsaw5WCHj6Oo
     4jpO7d2yN7WMfAj2hTEabz9wumQ0TMhBduZ-QON3pYObSy7TSC1vVme0NJrwF_cJRe
     hKTFmdlXGVldPxZCplr7ZQqRQhF8JP-l4mEQVnCaWGn9ONHlemczGOS-A-wwtnmwjI
     B1V_vgJRf4FdpV-4hUk4-QLpu3-1lWFxrtZKcggq3tWTduRo5_QebQbUUT_VSCgsFc
     OmyWKoj56lbxthN19hq1XGWbLGfrrR6MWh23vk01zn8FVwi7uFwEnRYSafsnWLa1Z5
     TpBj9GvAdl2H9NHwzpB5NqHpZNkQ3NMDj13Fn8fzO0JB83Etbm_tnFQfcb13X3bJ15
     Cz-Ww1MGhvIpGGnMBT_ADp9xSIyAM9dQ1yeVXk-AIgWBUlN5uyWSGyCxp0cJwx7HxM
     38z0UIeBu-MytL-eqndM7LxytsVzCbjOTSVRmhYEMIzUAnS1gs7uMQAGRdgRIElTJE
     SGMjb_4bZq9s6Ve1LKkSi0_QDsrABaLe55UY0zF4ZSfOV5PMyPtocwV_dcNPlxLgNA
     D1BFX_Z9kAdMZQW6fAmsfFle0zAoMe4l9pMESH0JB4sJGdCKtQXj1cXNydDYozF7l8
     H00BV_Er7zd6VtIw0MxwkFCTatsv_R-GsBCH218RgVPsfYhwVuT8R4HarpzsDBufC4
     r8_c8fc9Z278sQ081jFjOja6L2x0N_ImzFNXU6xwO-Ska-QeuvYZ3X_L31ZOX4Llp-
     7QSfgDoHnOxFv1Xws-D5mDHD3zxOup2b2TppdKTZb9eW2vxUVviM8OI9atBfPKMGAO
     v9omA-6vv5IxUH0-lWMiHLQ_g8vnswp-Jav0c4t6URVUzujNOoNd_CBGGVnHiJTCHl
     88LQxsqLHHIu4Fz-U2SGnlxGTj0-ihit2ELGRv4vO8E1BosTmf0cx3qgG0Pq0eOLBD
     IHsrdZ_CCAiTc0HVkMbyq1M6qEhM-q5P6y1QCIrwg

   Encoding this JWE Authentication Tag as BASE64URL(JWE Authentication
   Tag) gives this value:

     0HFmhOzsQ98nNWJjIHkR7A









<span class="grey">Jones                        Standards Track                   [Page 37]</span></pre>
<hr class='noprint'/><!--NewPage--><pre class='newpage'><span id="page-38" ></span>
<span class="grey"><a href="./rfc7517">RFC 7517</a>                   JSON Web Key (JWK)                   May 2015</span>


<span class="h3"><a class="selflink" id="appendix-C.9" href="#appendix-C.9">C.9</a>.  Complete Representation</span>

   Assemble the final representation: The JWE Compact Serialization of
   this result, as defined in Section 7.1 of [<a href="#ref-JWE" title="&quot;JSON Web Encryption (JWE)&quot;">JWE</a>], is the string
   BASE64URL(UTF8(JWE Protected Header)) || '.' || BASE64URL(JWE
   Encrypted Key) || '.' || BASE64URL(JWE Initialization Vector) || '.'
   || BASE64URL(JWE Ciphertext) || '.' || BASE64URL(JWE Authentication
   Tag).











































<span class="grey">Jones                        Standards Track                   [Page 38]</span></pre>
<hr class='noprint'/><!--NewPage--><pre class='newpage'><span id="page-39" ></span>
<span class="grey"><a href="./rfc7517">RFC 7517</a>                   JSON Web Key (JWK)                   May 2015</span>


   The final result in this example (with line breaks for display
   purposes only) is:

     eyJhbGciOiJQQkVTMi1IUzI1NitBMTI4S1ciLCJwMnMiOiIyV0NUY0paMVJ2ZF9DSn
     VKcmlwUTF3IiwicDJjIjo0MDk2LCJlbmMiOiJBMTI4Q0JDLUhTMjU2IiwiY3R5Ijoi
     andrK2pzb24ifQ.
     TrqXOwuNUfDV9VPTNbyGvEJ9JMjefAVn-TR1uIxR9p6hsRQh9Tk7BA.
     Ye9j1qs22DmRSAddIh-VnA.
     AwhB8lxrlKjFn02LGWEqg27H4Tg9fyZAbFv3p5ZicHpj64QyHC44qqlZ3JEmnZTgQo
     wIqZJ13jbyHB8LgePiqUJ1hf6M2HPLgzw8L-mEeQ0jvDUTrE07NtOerBk8bwBQyZ6g
     0kQ3DEOIglfYxV8-FJvNBYwbqN1Bck6d_i7OtjSHV-8DIrp-3JcRIe05YKy3Oi34Z_
     GOiAc1EK21B11c_AE11PII_wvvtRiUiG8YofQXakWd1_O98Kap-UgmyWPfreUJ3lJP
     nbD4Ve95owEfMGLOPflo2MnjaTDCwQokoJ_xplQ2vNPz8iguLcHBoKllyQFJL2mOWB
     wqhBo9Oj-O800as5mmLsvQMTflIrIEbbTMzHMBZ8EFW9fWwwFu0DWQJGkMNhmBZQ-3
     lvqTc-M6-gWA6D8PDhONfP2Oib2HGizwG1iEaX8GRyUpfLuljCLIe1DkGOewhKuKkZ
     h04DKNM5Nbugf2atmU9OP0Ldx5peCUtRG1gMVl7Qup5ZXHTjgPDr5b2N731UooCGAU
     qHdgGhg0JVJ_ObCTdjsH4CF1SJsdUhrXvYx3HJh2Xd7CwJRzU_3Y1GxYU6-s3GFPbi
     rfqqEipJDBTHpcoCmyrwYjYHFgnlqBZRotRrS95g8F95bRXqsaDY7UgQGwBQBwy665
     d0zpvTasvfXf_c0MWAl-neFaKOW_Px6g4EUDjG1GWSXV9cLStLw_0ovdApDIFLHYHe
     PyagyHjouQUuGiq7BsYwYrwaF06tgB8hV8omLNfMEmDPJaZUzMuHw6tBDwGkzD-tS_
     ub9hxrpJ4UsOWnt5rGUyoN2N_c1-TQlXxm5oto14MxnoAyBQBpwIEgSH3Y4ZhwKBhH
     PjSo0cdwuNdYbGPpb-YUvF-2NZzODiQ1OvWQBRHSbPWYz_xbGkgD504LRtqRwCO7CC
     _CyyURi1sEssPVsMJRX_U4LFEOc82TiDdqjKOjRUfKK5rqLi8nBE9soQ0DSaOoFQZi
     GrBrqxDsNYiAYAmxxkos-i3nX4qtByVx85sCE5U_0MqG7COxZWMOPEFrDaepUV-cOy
     rvoUIng8i8ljKBKxETY2BgPegKBYCxsAUcAkKamSCC9AiBxA0UOHyhTqtlvMksO7AE
     hNC2-YzPyx1FkhMoS4LLe6E_pFsMlmjA6P1NSge9C5G5tETYXGAn6b1xZbHtmwrPSc
     ro9LWhVmAaA7_bxYObnFUxgWtK4vzzQBjZJ36UTk4OTB-JvKWgfVWCFsaw5WCHj6Oo
     4jpO7d2yN7WMfAj2hTEabz9wumQ0TMhBduZ-QON3pYObSy7TSC1vVme0NJrwF_cJRe
     hKTFmdlXGVldPxZCplr7ZQqRQhF8JP-l4mEQVnCaWGn9ONHlemczGOS-A-wwtnmwjI
     B1V_vgJRf4FdpV-4hUk4-QLpu3-1lWFxrtZKcggq3tWTduRo5_QebQbUUT_VSCgsFc
     OmyWKoj56lbxthN19hq1XGWbLGfrrR6MWh23vk01zn8FVwi7uFwEnRYSafsnWLa1Z5
     TpBj9GvAdl2H9NHwzpB5NqHpZNkQ3NMDj13Fn8fzO0JB83Etbm_tnFQfcb13X3bJ15
     Cz-Ww1MGhvIpGGnMBT_ADp9xSIyAM9dQ1yeVXk-AIgWBUlN5uyWSGyCxp0cJwx7HxM
     38z0UIeBu-MytL-eqndM7LxytsVzCbjOTSVRmhYEMIzUAnS1gs7uMQAGRdgRIElTJE
     SGMjb_4bZq9s6Ve1LKkSi0_QDsrABaLe55UY0zF4ZSfOV5PMyPtocwV_dcNPlxLgNA
     D1BFX_Z9kAdMZQW6fAmsfFle0zAoMe4l9pMESH0JB4sJGdCKtQXj1cXNydDYozF7l8
     H00BV_Er7zd6VtIw0MxwkFCTatsv_R-GsBCH218RgVPsfYhwVuT8R4HarpzsDBufC4
     r8_c8fc9Z278sQ081jFjOja6L2x0N_ImzFNXU6xwO-Ska-QeuvYZ3X_L31ZOX4Llp-
     7QSfgDoHnOxFv1Xws-D5mDHD3zxOup2b2TppdKTZb9eW2vxUVviM8OI9atBfPKMGAO
     v9omA-6vv5IxUH0-lWMiHLQ_g8vnswp-Jav0c4t6URVUzujNOoNd_CBGGVnHiJTCHl
     88LQxsqLHHIu4Fz-U2SGnlxGTj0-ihit2ELGRv4vO8E1BosTmf0cx3qgG0Pq0eOLBD
     IHsrdZ_CCAiTc0HVkMbyq1M6qEhM-q5P6y1QCIrwg.
     0HFmhOzsQ98nNWJjIHkR7A








<span class="grey">Jones                        Standards Track                   [Page 39]</span></pre>
<hr class='noprint'/><!--NewPage--><pre class='newpage'><span id="page-40" ></span>
<span class="grey"><a href="./rfc7517">RFC 7517</a>                   JSON Web Key (JWK)                   May 2015</span>


Acknowledgements

   A JSON representation for RSA public keys was previously introduced
   by John Panzer, Ben Laurie, and Dirk Balfanz in Magic Signatures
   [<a href="#ref-MagicSignatures">MagicSignatures</a>].

   Thanks to Matt Miller for creating the encrypted key example and to
   Edmund Jay and Brian Campbell for validating the example.

   This specification is the work of the JOSE working group, which
   includes dozens of active and dedicated participants.  In particular,
   the following individuals contributed ideas, feedback, and wording
   that influenced this specification:

   Dirk Balfanz, Richard Barnes, John Bradley, Brian Campbell, Breno de
   Medeiros, Stephen Farrell, Joe Hildebrand, Edmund Jay, Stephen Kent,
   Ben Laurie, James Manger, Matt Miller, Kathleen Moriarty, Chuck
   Mortimore, Tony Nadalin, Axel Nennker, John Panzer, Eric Rescorla,
   Pete Resnick, Nat Sakimura, Jim Schaad, Ryan Sleevi, Paul Tarjan,
   Hannes Tschofenig, and Sean Turner.

   Jim Schaad and Karen O'Donoghue chaired the JOSE working group and
   Sean Turner, Stephen Farrell, and Kathleen Moriarty served as
   Security Area Directors during the creation of this specification.

Author's Address

   Michael B. Jones
   Microsoft

   EMail: mbj@microsoft.com
   URI:   <a href="http://self-issued.info/">http://self-issued.info/</a>



















Jones                        Standards Track                   [Page 40]
</pre>