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<link title="Get" rel="Chapter" href="Get.html"><title>Ocamlnet 4 Reference Manual : Crypto</title>
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<h1>Crypto</h1>
<div class="info-desc">
<h2 id="1_Cryptography">Cryptography</h2>
<p>OCamlnet-4 does not include any implementations of cryptographic
ciphers or hashes. It does, however, include a binding to GnuTLS and
GNU Nettle, providing cryptography, and it defines a number of helper
functions to use cryptography efficiently.</p>
<p>Before OCamlnet-4, some modules used Xavier Leroy's Cryptokit. This
dependency is gone now.</p>
<h3 id="2_Cryptographyproviders">Cryptography providers</h3>
<p>Like for TLS (see <a href="Tls.html"><code class="code">Tls</code></a>), first-class modules are used to modularize
the provider of the crypto functions:</p>
<ul>
<li><a href="Netsys_crypto_types.SYMMETRIC_CRYPTO.html"><code class="code">Netsys_crypto_types.SYMMETRIC_CRYPTO</code></a>: Defines symmetric ciphers</li>
<li><a href="Netsys_crypto_types.DIGESTS.html"><code class="code">Netsys_crypto_types.DIGESTS</code></a>: Defines digests (hashes)</li>
<li><a href="Netsys_crypto_types.PUBKEY_CRYPTO.html"><code class="code">Netsys_crypto_types.PUBKEY_CRYPTO</code></a>: Defines public-key ciphers</li>
</ul>
<p>There are default providers:</p>
<ul>
<li><a href="Netsys_crypto.html#VALcurrent_symmetric_crypto"><code class="code">Netsys_crypto.current_symmetric_crypto</code></a></li>
<li><a href="Netsys_crypto.html#VALcurrent_digests"><code class="code">Netsys_crypto.current_digests</code></a></li>
<li><a href="Netsys_crypto.html#VALcurrent_pubkey_crypto"><code class="code">Netsys_crypto.current_pubkey_crypto</code></a></li>
</ul>
<p>If not initialized, these providers are empty, i.e. the lists of available
ciphers and digests are empty. This can be changed by initializing a provider.
So far, there is only GnuTLS/Nettle, and you can enable this by</p>
<ul>
<li>linking with the package nettls-gnutls</li>
<li>calling <code class="code">Nettls_gnutls.init()</code></li>
</ul>
<h3 id="2_Usingcryptography">Using cryptography</h3>
<p>It is not advised to call any functions of the providers directly: the API
is not yet stable, and may change, and there are some inconveniences
in the buffer management. Instead, use the following functionality:</p>
<ul>
<li><a href="Netsys_ciphers.html"><code class="code">Netsys_ciphers</code></a> is the main user-oriented API for encrypting or decrypting
a message with symmetric ciphers</li>
<li>Also see the channels described here: <a href="Netchannels_crypto.html#symmetric"><i>Symmetric Cryptography</i></a></li>
<li><a href="Netsys_digests.html"><code class="code">Netsys_digests</code></a> is the main API for digesting messages.</li>
<li><a href="Netx509_pubkey.html"><code class="code">Netx509_pubkey</code></a> and <a href="Netx509_pubkey_crypto.html"><code class="code">Netx509_pubkey_crypto</code></a> is the API for using
public key cryptography according to X509.</li>
</ul>
<h3 id="2_Examples">Examples</h3>
<p>Encrypt a string <code class="code">s</code> with AES-128 in CBC mode and length-style padding:</p>
<pre class="codepre"><code class="code">let key = "0123456789abcdef"
let iv = "0123456789abcdef"
let cipher = Netsys_ciphers.find ("AES-128", "CBC")
let ctx = cipher # create key `Length
let () = ctx # set_iv iv
let s_enc = ctx # encrypt_string s
</code></pre>
<p>Compute the SHA1 digest of a string <code class="code">s</code>:</p>
<pre class="codepre"><code class="code">let digest = Netsys_digests.find "SHA1-160"
let ctx = digest # create()
let () = ctx # add_substring s 0 (String.length s)
let result = ctx # finish()
</code></pre>
<h3 id="2_Supportedciphers">Supported ciphers</h3>
<p>If using nettls-gnutls as provider, you can normally expect:</p>
<ul>
<li>AES (key sizes: 128, 192, 256)</li>
<li>ARCFOUR (key size: 128)
. RC2 (key sizes: 40, 64, 128)</li>
<li>BLOWFISH (key size variable)</li>
<li>CAMELLIA (key sizes: 128, 192, 256)</li>
<li>CAST (key size: 128)</li>
<li>DES (key size: 56)</li>
<li>3DES (key size: 112)</li>
<li>SERPENT (key sizes: 128, 192, 256)</li>
<li>TWOFISH (key sizes: 128, 192, 256)</li>
</ul>
<p>All ciphers are supported in ECB, CBC, CTR, and OFB modes.</p>
<p>If using a recent version of GnuTLS/Nettls:</p>
<ul>
<li>AES in CBC mode is accelerated if the CPU supports it (Intel AES-NI, or
VIA Padlock)</li>
<li>AES in GCM mode, also with an acceleration option</li>
<li>CAMELLIA in GCM mode</li>
</ul>
<h3 id="2_Supporteddigests">Supported digests</h3>
<p>If using nettls-gnutls as provider, you can normally expect:</p>
<ul>
<li>MD2</li>
<li>MD4</li>
<li>MD5</li>
<li>SHA1</li>
<li>SHA2-256</li>
</ul>
<p>If using a recent version of GnuTLS/Nettls:</p>
<ul>
<li>SHA2 with block sizes 224, 256, 384 and 512 bits</li>
<li>SHA3 with block sizes 224, 256, 384 and 512 bits</li>
<li>RIPEMD (160 bits)</li>
<li>GOSTHASH94 (256 bits)</li>
</ul>
<h3 id="2_Supportedpublickeyciphers">Supported public key ciphers</h3>
<p>You can normally use for encryption:</p>
<ul>
<li>RSA</li>
</ul>
<p>You can use for signing:</p>
<ul>
<li>RSA</li>
<li>DSA</li>
<li>ECDSA</li>
</ul>
<p>Currently, there isn't an interface for key agreement yet, so all
Diffie-Hellman variants are out of reach at the moment.</p>
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