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<html xmlns="http://www.w3.org/1999/xhtml"><head><title>MD5 (ocaml.Stdlib.Digest.MD5)</title><meta charset="utf-8"/><link rel="stylesheet" href="../../../../_odoc-theme/odoc.css"/><meta name="generator" content="odoc 3.0.0"/><meta name="viewport" content="width=device-width,initial-scale=1.0"/><script src="../../../../highlight.pack.js"></script><script>hljs.initHighlightingOnLoad();</script></head><body class="odoc"><nav class="odoc-nav"><a href="../index.html">Up</a> – <a href="../../../../index.html">Index</a> » <a href="../../../index.html">ocaml</a> » <a href="../../index.html">Stdlib</a> » <a href="../index.html">Digest</a> » MD5</nav><header class="odoc-preamble"><h1>Module <code><span>Digest.MD5</span></code></h1><p><code>MD5</code> is the MD5 hash function. It produces 128-bit (16-byte) digests and is not cryptographically secure at all. It should be used only for compatibility with earlier designs that mandate the use of MD5.</p><ul class="at-tags"><li class="since"><span class="at-tag">since</span> 5.2</li></ul></header><div class="odoc-content"><div class="odoc-spec"><div class="spec type anchored" id="type-t"><a href="#type-t" class="anchor"></a><code><span><span class="keyword">type</span> t</span><span> = string</span></code></div><div class="spec-doc"><p>The type of digests.</p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-hash_length"><a href="#val-hash_length" class="anchor"></a><code><span><span class="keyword">val</span> hash_length : int</span></code></div><div class="spec-doc"><p>The length of digests, in bytes.</p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-compare"><a href="#val-compare" class="anchor"></a><code><span><span class="keyword">val</span> compare : <span><a href="#type-t">t</a> <span class="arrow">-></span></span> <span><a href="#type-t">t</a> <span class="arrow">-></span></span> int</span></code></div><div class="spec-doc"><p>Compare two digests, with the same specification as <a href="../../index.html#val-compare"><code>Stdlib.compare</code></a>.</p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-equal"><a href="#val-equal" class="anchor"></a><code><span><span class="keyword">val</span> equal : <span><a href="#type-t">t</a> <span class="arrow">-></span></span> <span><a href="#type-t">t</a> <span class="arrow">-></span></span> bool</span></code></div><div class="spec-doc"><p>Test two digests for equality.</p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-string"><a href="#val-string" class="anchor"></a><code><span><span class="keyword">val</span> string : <span>string <span class="arrow">-></span></span> <a href="#type-t">t</a></span></code></div><div class="spec-doc"><p>Return the digest of the given string.</p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-bytes"><a href="#val-bytes" class="anchor"></a><code><span><span class="keyword">val</span> bytes : <span>bytes <span class="arrow">-></span></span> <a href="#type-t">t</a></span></code></div><div class="spec-doc"><p>Return the digest of the given byte sequence.</p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-substring"><a href="#val-substring" class="anchor"></a><code><span><span class="keyword">val</span> substring : <span>string <span class="arrow">-></span></span> <span>int <span class="arrow">-></span></span> <span>int <span class="arrow">-></span></span> <a href="#type-t">t</a></span></code></div><div class="spec-doc"><p><code>substring s ofs len</code> returns the digest of the substring of <code>s</code> starting at index <code>ofs</code> and containing <code>len</code> characters.</p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-subbytes"><a href="#val-subbytes" class="anchor"></a><code><span><span class="keyword">val</span> subbytes : <span>bytes <span class="arrow">-></span></span> <span>int <span class="arrow">-></span></span> <span>int <span class="arrow">-></span></span> <a href="#type-t">t</a></span></code></div><div class="spec-doc"><p><code>subbytes s ofs len</code> returns the digest of the subsequence of <code>s</code> starting at index <code>ofs</code> and containing <code>len</code> bytes.</p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-channel"><a href="#val-channel" class="anchor"></a><code><span><span class="keyword">val</span> channel : <span><a href="../../index.html#type-in_channel">in_channel</a> <span class="arrow">-></span></span> <span>int <span class="arrow">-></span></span> <a href="#type-t">t</a></span></code></div><div class="spec-doc"><p>Read characters from the channel and return their digest. See <a href="../index.html#val-channel"><code>Digest.channel</code></a> for the full specification.</p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-file"><a href="#val-file" class="anchor"></a><code><span><span class="keyword">val</span> file : <span>string <span class="arrow">-></span></span> <a href="#type-t">t</a></span></code></div><div class="spec-doc"><p>Return the digest of the file whose name is given.</p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-output"><a href="#val-output" class="anchor"></a><code><span><span class="keyword">val</span> output : <span><a href="../../index.html#type-out_channel">out_channel</a> <span class="arrow">-></span></span> <span><a href="#type-t">t</a> <span class="arrow">-></span></span> unit</span></code></div><div class="spec-doc"><p>Write a digest on the given output channel.</p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-input"><a href="#val-input" class="anchor"></a><code><span><span class="keyword">val</span> input : <span><a href="../../index.html#type-in_channel">in_channel</a> <span class="arrow">-></span></span> <a href="#type-t">t</a></span></code></div><div class="spec-doc"><p>Read a digest from the given input channel.</p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-to_hex"><a href="#val-to_hex" class="anchor"></a><code><span><span class="keyword">val</span> to_hex : <span><a href="#type-t">t</a> <span class="arrow">-></span></span> string</span></code></div><div class="spec-doc"><p>Return the printable hexadecimal representation of the given digest.</p><ul class="at-tags"><li class="raises"><span class="at-tag">raises</span> <a href="../../index.html#exception-Invalid_argument"><code>Invalid_argument</code></a> <p>if the length of the argument is not <code>hash_length</code>,</p></li></ul></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-of_hex"><a href="#val-of_hex" class="anchor"></a><code><span><span class="keyword">val</span> of_hex : <span>string <span class="arrow">-></span></span> <a href="#type-t">t</a></span></code></div><div class="spec-doc"><p>Convert a hexadecimal representation back into the corresponding digest.</p><ul class="at-tags"><li class="raises"><span class="at-tag">raises</span> <a href="../../index.html#exception-Invalid_argument"><code>Invalid_argument</code></a> <p>if the length of the argument is not <code>2 * hash_length</code>, or if the arguments contains non-hexadecimal characters.</p></li></ul></div></div></div></body></html>
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