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<link title="Get" rel="Chapter" href="Get.html"><title>Ocamlnet 4 Reference Manual : Netx509_pubkey</title>
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<h1>Module <a href="type_Netx509_pubkey.html">Netx509_pubkey</a></h1>

<pre><span id="MODULENetx509_pubkey"><span class="keyword">module</span> Netx509_pubkey</span>: <code class="code">sig</code> <a href="Netx509_pubkey.html">..</a> <code class="code">end</code></pre><div class="info module top">
<div class="info-desc">
<p>X.509 public key cryptography - keys and naming</p>
</div>
</div>
<hr width="100%">
<p>Support for reading in public keys and retrieving the type of the key.
    This module is mostly about naming key types and algorithms.</p>

<p>In the X.509 standard a public key is often part of a certificate
    and there stored in the <code class="code">subjectPublicKeyInfo</code> field. However, "raw"
    public keys (i.e. outside certificates) are also known. In this case,
    the same representation as for <code class="code">subjectPublicKeyInfo</code> field is chosen
    and just stored separately in a file.</p>

<p>Like certificates, public keys are described by an ASN.1 syntax
    and are normally stored by applying the DER encoding rules. If
    stored in files, PEM headers for the DER encoding are common. Such
    files have a PEM header of "BEGIN PUBLIC KEY". Note that the
    header - unlike for private keys - does not indicate the type of
    key. The type is already a member of the <code class="code">subjectPublicKeyInfo</code>
    field.</p>

<p>A public key consists of three parts:</p>
<ul>
<li>the OID of the type of the key</li>
<li>the parameters of the algorithm</li>
<li>the key data</li>
</ul>
<p>A certain type of public key can only be used with certain algorithms.
    Often, the OID for the type of the key is simply set to the OID for the
    simplest algorithm that can be used with the key. For example, RSA keys
    have the OID of the PKCS-1 encryption algorithm. However, you can use
    the same keys also with the slightly more complicated PKCS-1 signing
    algorithms.</p>

<p>It depends on the algorithm whether the parameters can be changed while
    keeping the key data.</p>

<p>See <a href="Netx509_pubkey_crypto.html"><code class="code">Netx509_pubkey_crypto</code></a> for functions that actually encrypt or
    sign data with the current crypto provider.</p>

<pre><span id="TYPEoid"><span class="keyword">type</span> <code class="type"></code>oid</span> = <code class="type"><a href="Netoid.html#TYPEt">Netoid.t</a></code> </pre>
<div class="info ">
<div class="info-desc">
<p>OIDs are just integer sequences</p>
</div>
</div>


<pre><code><span id="TYPEalg_id"><span class="keyword">type</span> <code class="type"></code>alg_id</span> = </code></pre><table class="typetable">
<tr>
<td align="left" valign="top" >
<code><span class="keyword">|</span></code></td>
<td align="left" valign="top" >
<code><span id="TYPEELTalg_id.Alg_id"><span class="constructor">Alg_id</span></span> <span class="keyword">of</span> <code class="type"><a href="Netx509_pubkey.html#TYPEoid">oid</a> * <a href="Netasn1.Value.html#TYPEvalue">Netasn1.Value.value</a> option</code></code></td>
<td class="typefieldcomment" align="left" valign="top" ><code>(*</code></td><td class="typefieldcomment" align="left" valign="top" ><div class="info ">
<div class="info-desc">
<p>Algorithms are identified by an OID and OID-specific parameters.</p>
</div>
</div>
</td><td class="typefieldcomment" align="left" valign="bottom" ><code>*)</code></td>
</tr></table>



<pre><code><span id="TYPEpubkey"><span class="keyword">type</span> <code class="type"></code>pubkey</span> = {</code></pre><table class="typetable">
<tr>
<td align="left" valign="top" >
<code>&nbsp;&nbsp;</code></td>
<td align="left" valign="top" >
<code><span id="TYPEELTpubkey.pubkey_type">pubkey_type</span>&nbsp;: <code class="type"><a href="Netx509_pubkey.html#TYPEalg_id">alg_id</a></code>;</code></td>

</tr>
<tr>
<td align="left" valign="top" >
<code>&nbsp;&nbsp;</code></td>
<td align="left" valign="top" >
<code><span id="TYPEELTpubkey.pubkey_data">pubkey_data</span>&nbsp;: <code class="type"><a href="Netasn1.Value.html#TYPEbitstring_value">Netasn1.Value.bitstring_value</a></code>;</code></td>

</tr></table>
}

<div class="info ">
<div class="info-desc">
<p>Public key info: the key as such plus the algorithm. This combination
      is stored in PEM files tagged with "PUBLIC KEY", and also part of X.509
      certificates.</p>
</div>
</div>


<pre><span id="TYPEhash_function"><span class="keyword">type</span> <code class="type"></code>hash_function</span> = <code class="type">[ `SHA_1 | `SHA_224 | `SHA_256 | `SHA_384 | `SHA_512 ]</code> </pre>


<pre><span id="TYPEmaskgen_function"><span class="keyword">type</span> <code class="type"></code>maskgen_function</span> = <code class="type">[ `MGF1 of <a href="Netx509_pubkey.html#TYPEhash_function">hash_function</a> ]</code> </pre>


<pre><code><span id="TYPEalg_param"><span class="keyword">type</span> <code class="type"></code>alg_param</span> = </code></pre><table class="typetable">
<tr>
<td align="left" valign="top" >
<code><span class="keyword">|</span></code></td>
<td align="left" valign="top" >
<code><span id="TYPEELTalg_param.P_PSS"><span class="constructor">P_PSS</span></span> <span class="keyword">of</span> <code class="type"><a href="Netx509_pubkey.html#TYPEhash_function">hash_function</a> * <a href="Netx509_pubkey.html#TYPEmaskgen_function">maskgen_function</a> * int</code></code></td>

</tr>
<tr>
<td align="left" valign="top" >
<code><span class="keyword">|</span></code></td>
<td align="left" valign="top" >
<code><span id="TYPEELTalg_param.P_OAEP"><span class="constructor">P_OAEP</span></span> <span class="keyword">of</span> <code class="type"><a href="Netx509_pubkey.html#TYPEhash_function">hash_function</a> * <a href="Netx509_pubkey.html#TYPEmaskgen_function">maskgen_function</a> * string</code></code></td>

</tr></table>



<pre><code><span id="TYPEencrypt_alg"><span class="keyword">type</span> <code class="type"></code>encrypt_alg</span> = </code></pre><table class="typetable">
<tr>
<td align="left" valign="top" >
<code><span class="keyword">|</span></code></td>
<td align="left" valign="top" >
<code><span id="TYPEELTencrypt_alg.Encrypt"><span class="constructor">Encrypt</span></span> <span class="keyword">of</span> <code class="type"><a href="Netx509_pubkey.html#TYPEoid">oid</a> * <a href="Netx509_pubkey.html#TYPEalg_param">alg_param</a> option</code></code></td>
<td class="typefieldcomment" align="left" valign="top" ><code>(*</code></td><td class="typefieldcomment" align="left" valign="top" ><div class="info ">
<div class="info-desc">
<p>An algorithm that can be used for encryption. Same format as <code class="code">Alg_id</code></p>
</div>
</div>
</td><td class="typefieldcomment" align="left" valign="bottom" ><code>*)</code></td>
</tr></table>



<pre><code><span id="TYPEsign_alg"><span class="keyword">type</span> <code class="type"></code>sign_alg</span> = </code></pre><table class="typetable">
<tr>
<td align="left" valign="top" >
<code><span class="keyword">|</span></code></td>
<td align="left" valign="top" >
<code><span id="TYPEELTsign_alg.Sign"><span class="constructor">Sign</span></span> <span class="keyword">of</span> <code class="type"><a href="Netx509_pubkey.html#TYPEoid">oid</a> * <a href="Netx509_pubkey.html#TYPEalg_param">alg_param</a> option</code></code></td>
<td class="typefieldcomment" align="left" valign="top" ><code>(*</code></td><td class="typefieldcomment" align="left" valign="top" ><div class="info ">
<div class="info-desc">
<p>An algorithm that can be used for signing. Same format as <code class="code">Alg_id</code></p>
</div>
</div>
</td><td class="typefieldcomment" align="left" valign="bottom" ><code>*)</code></td>
</tr></table>



<pre><code><span id="TYPEkex_alg"><span class="keyword">type</span> <code class="type"></code>kex_alg</span> = </code></pre><table class="typetable">
<tr>
<td align="left" valign="top" >
<code><span class="keyword">|</span></code></td>
<td align="left" valign="top" >
<code><span id="TYPEELTkex_alg.Kex"><span class="constructor">Kex</span></span> <span class="keyword">of</span> <code class="type"><a href="Netx509_pubkey.html#TYPEoid">oid</a> * <a href="Netx509_pubkey.html#TYPEalg_param">alg_param</a> option</code></code></td>
<td class="typefieldcomment" align="left" valign="top" ><code>(*</code></td><td class="typefieldcomment" align="left" valign="top" ><div class="info ">
<div class="info-desc">
<p>An algorithm that can be used for key agreement. Same format as 
      <code class="code">Alg_id</code></p>

<p>Remember that you can use any key agreement protocol also as public
      key mechanism: if Alice sends Bob message A based on a secret a, and Bob
      replies with message B based on a secret b, and both agree on a 
      key K=f(a,b), you can consider A as the public key and Alices's secret
      a as the private key. The message B is a parameter of
      the ciphertext (comparable to the IV in symmetric cryptography), and K
      is used as transport key (for a symmetric cipher). That's
      why the key agreement algorithms appear here.</p>
</div>
</div>
</td><td class="typefieldcomment" align="left" valign="bottom" ><code>*)</code></td>
</tr></table>



<pre><span id="VALdecode_pubkey_from_der"><span class="keyword">val</span> decode_pubkey_from_der</span> : <code class="type">string -> <a href="Netx509_pubkey.html#TYPEpubkey">pubkey</a></code></pre><div class="info ">
<div class="info-desc">
<p>Decodes a DER-encoded public key info structure. Note that this function
      performs only a partial check on the integrity of the data.</p>
</div>
</div>

<pre><span id="VALencode_pubkey_to_der"><span class="keyword">val</span> encode_pubkey_to_der</span> : <code class="type"><a href="Netx509_pubkey.html#TYPEpubkey">pubkey</a> -> string</code></pre><div class="info ">
<div class="info-desc">
<p>Encodes a public key info structure as DER</p>
</div>
</div>

<pre><span id="VALread_pubkey_from_pem"><span class="keyword">val</span> read_pubkey_from_pem</span> : <code class="type"><a href="Netchannels.in_obj_channel-c.html">Netchannels.in_obj_channel</a> -> <a href="Netx509_pubkey.html#TYPEpubkey">pubkey</a></code></pre><div class="info ">
<div class="info-desc">
<p>Reads a PEM file tagged as "PUBLIC KEY". Note that this function
      performs only a partial check on the integrity of the data.</p>
</div>
</div>

<pre><code><span id="TYPEprivkey"><span class="keyword">type</span> <code class="type"></code>privkey</span> = </code></pre><table class="typetable">
<tr>
<td align="left" valign="top" >
<code><span class="keyword">|</span></code></td>
<td align="left" valign="top" >
<code><span id="TYPEELTprivkey.Privkey"><span class="constructor">Privkey</span></span> <span class="keyword">of</span> <code class="type">string * string</code></code></td>
<td class="typefieldcomment" align="left" valign="top" ><code>(*</code></td><td class="typefieldcomment" align="left" valign="top" ><div class="info ">
<div class="info-desc">
<p><code class="code">(format,data)</code>, using the formats: "RSA", "DSA", "DH", "EC". The
      <code class="code">data</code> string is for the mentioned formats DER-encoded.</p>
</div>
</div>
</td><td class="typefieldcomment" align="left" valign="bottom" ><code>*)</code></td>
</tr></table>



<pre><span id="VALread_privkey_from_pem"><span class="keyword">val</span> read_privkey_from_pem</span> : <code class="type"><a href="Netchannels.in_obj_channel-c.html">Netchannels.in_obj_channel</a> -> <a href="Netx509_pubkey.html#TYPEprivkey">privkey</a></code></pre><div class="info ">
<div class="info-desc">
<p>Reads a PEM file tagged as "... PRIVATE KEY". This function cannot handle
      encrypted private keys. Note that this function
      performs only a partial check on the integrity of the data.</p>
</div>
</div>

<pre><span id="MODULEKey"><span class="keyword">module</span> <a href="Netx509_pubkey.Key.html">Key</a></span>: <code class="code">sig</code> <a href="Netx509_pubkey.Key.html">..</a> <code class="code">end</code></pre>
<pre><span id="MODULEEncryption"><span class="keyword">module</span> <a href="Netx509_pubkey.Encryption.html">Encryption</a></span>: <code class="code">sig</code> <a href="Netx509_pubkey.Encryption.html">..</a> <code class="code">end</code></pre>
<pre><span id="MODULEKeyagreement"><span class="keyword">module</span> <a href="Netx509_pubkey.Keyagreement.html">Keyagreement</a></span>: <code class="code">sig</code> <a href="Netx509_pubkey.Keyagreement.html">..</a> <code class="code">end</code></pre>
<pre><span id="MODULESigning"><span class="keyword">module</span> <a href="Netx509_pubkey.Signing.html">Signing</a></span>: <code class="code">sig</code> <a href="Netx509_pubkey.Signing.html">..</a> <code class="code">end</code></pre></body></html>