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<title>Ocamlnet 4 Reference Manual : Netauth</title>
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<h1>Module <a href="type_Netauth.html">Netauth</a></h1>
<pre><span id="MODULENetauth"><span class="keyword">module</span> Netauth</span>: <code class="code">sig</code> <a href="Netauth.html">..</a> <code class="code">end</code></pre><div class="info module top">
<div class="info-desc">
<p>Some primitives for authentication</p>
</div>
</div>
<hr width="100%">
<pre><span id="VALhmac"><span class="keyword">val</span> hmac</span> : <code class="type">h:(string -> string) -><br> b:int -> l:int -> k:string -> message:string -> string</code></pre><div class="info ">
<div class="info-desc">
<p>The HMAC algorithm of RFC 2104. The function <code class="code">h</code> is the hash function.
<code class="code">b</code> and <code class="code">l</code> are properties of <code class="code">h</code> (see the RFC or below). The string
<code class="code">k</code> is the key, up to <code class="code">b</code> bytes. The <code class="code">message</code> is authenticated.</p>
<p>The key <code class="code">k</code> should ideally have length <code class="code">l</code>. If this cannot be ensured
by other means, one should pass <code class="code">k = h any_k</code>.</p>
<p>Common values of <code class="code">b</code> and <code class="code">l</code>:</p>
<ul>
<li>For <code class="code">h=MD5</code>: <code class="code">b=64</code>, <code class="code">l=16</code></li>
<li>For <code class="code">h=SHA-1</code>: <code class="code">b=64</code>, <code class="code">l=20</code></li>
</ul>
<p>See also <a href="Netsys_digests.html#VALhmac"><code class="code">Netsys_digests.hmac</code></a> for a better implementation.</p>
</div>
</div>
<pre><span id="TYPEkey_type"><span class="keyword">type</span> <code class="type"></code>key_type</span> = <code class="type">[ `Kc | `Ke | `Ki ]</code> </pre>
<div class="info ">
<div class="info-desc">
<p>Key types:</p>
<ul>
<li><code class="code">`Kc</code> is used for computing checksums</li>
<li><code class="code">`Ke</code> is used for encrypting confidential messages</li>
<li><code class="code">`Ki</code> is used for computing integrity checksums for encrypted
messages</li>
</ul>
</div>
</div>
<pre><span id="VALderive_key_rfc3961_simplified"><span class="keyword">val</span> derive_key_rfc3961_simplified</span> : <code class="type">encrypt:(string -> string) -><br> random_to_key:(string -> string) -><br> block_size:int -> k:int -> usage:int -> key_type:<a href="Netauth.html#TYPEkey_type">key_type</a> -> string</code></pre><div class="info ">
<div class="info-desc">
<p>Derives a special key from a base key, as described in RFC 3961.</p>
<ul>
<li><code class="code">encrypt</code>: Encrypts the argument with the base key and the
initial cipher state.</li>
<li><code class="code">random_to_key</code>: Converts a random string of size <code class="code">k</code> to a key</li>
<li><code class="code">block_size</code>: The block size of the cipher underlying <code class="code">encrypt</code>.
It is ensured that <code class="code">encrypt</code> is called with strings having exactly
this many bits. (The <code class="code">c</code> parameter in the RFC text.) Minimum: 40.</li>
<li><code class="code">k</code>: The input size for <code class="code">random_to_key</code> in bits. Must be divisible
by 8.</li>
<li><code class="code">usage</code>: The usage number (here restricted to 0-255, although the
RFC would allow 32 bits). Examples for usage numbers can be found
in RFC 4121 section 2.</li>
<li><code class="code">key_type</code>: Which key type to derive</li>
</ul>
<p>The output is a key as produced by <code class="code">random_to_key</code>.</p>
</div>
</div>
<h3 id="2_Bitstringoperations">Bitstring operations</h3>
<pre><span id="VALxor_s"><span class="keyword">val</span> xor_s</span> : <code class="type">string -> string -> string</code></pre><div class="info ">
<div class="info-desc">
<p>Performs the bitwise XOR of these strings (which must have the same
length)</p>
</div>
</div>
<pre><span id="VALadd_1_complement"><span class="keyword">val</span> add_1_complement</span> : <code class="type">string -> string -> string</code></pre><div class="info ">
<div class="info-desc">
<p>The addition algorithm for 1's-complement numbers. The two numbers to
add are given as bitstrings (big endian), and must have the same
length</p>
</div>
</div>
<pre><span id="VALrotate_right"><span class="keyword">val</span> rotate_right</span> : <code class="type">int -> string -> string</code></pre><div class="info ">
<div class="info-desc">
<p>Rotate the (big-endian) bitstring to the right by n bits. This also
works for negative n (left rotation), and for n whose absolute value
is greater or equal than the bit length of the string.</p>
</div>
</div>
<pre><span id="VALn_fold"><span class="keyword">val</span> n_fold</span> : <code class="type">int -> string -> string</code></pre><div class="info ">
<div class="info-desc">
<p>Blumenthal's n-fold algorithm for an n that is divisible by 8.
(RFC 3961, section 5.1)</p>
</div>
</div>
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