91 lines
3.8 KiB
HTML
91 lines
3.8 KiB
HTML
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<?xml version="1.0" ?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<title>MDC2_Init</title>
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<meta http-equiv="content-type" content="text/html; charset=utf-8" />
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<link rev="made" href="mailto:" />
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</head>
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<body>
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<ul id="index">
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<li><a href="#NAME">NAME</a></li>
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<li><a href="#SYNOPSIS">SYNOPSIS</a></li>
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<li><a href="#DESCRIPTION">DESCRIPTION</a></li>
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<li><a href="#RETURN-VALUES">RETURN VALUES</a></li>
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<li><a href="#CONFORMING-TO">CONFORMING TO</a></li>
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<li><a href="#SEE-ALSO">SEE ALSO</a></li>
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<li><a href="#HISTORY">HISTORY</a></li>
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<li><a href="#COPYRIGHT">COPYRIGHT</a></li>
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</ul>
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<h1 id="NAME">NAME</h1>
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<p>MDC2, MDC2_Init, MDC2_Update, MDC2_Final - MDC2 hash function</p>
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<h1 id="SYNOPSIS">SYNOPSIS</h1>
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<pre><code> #include <openssl/mdc2.h></code></pre>
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<p>The following functions have been deprecated since OpenSSL 3.0, and can be hidden entirely by defining <b>OPENSSL_API_COMPAT</b> with a suitable version value, see <a href="../man7/openssl_user_macros.html">openssl_user_macros(7)</a>:</p>
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<pre><code> unsigned char *MDC2(const unsigned char *d, unsigned long n,
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unsigned char *md);
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int MDC2_Init(MDC2_CTX *c);
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int MDC2_Update(MDC2_CTX *c, const unsigned char *data,
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unsigned long len);
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int MDC2_Final(unsigned char *md, MDC2_CTX *c);</code></pre>
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<h1 id="DESCRIPTION">DESCRIPTION</h1>
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<p>All of the functions described on this page are deprecated. Applications should instead use <a href="../man3/EVP_DigestInit_ex.html">EVP_DigestInit_ex(3)</a>, <a href="../man3/EVP_DigestUpdate.html">EVP_DigestUpdate(3)</a> and <a href="../man3/EVP_DigestFinal_ex.html">EVP_DigestFinal_ex(3)</a>.</p>
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<p>MDC2 is a method to construct hash functions with 128 bit output from block ciphers. These functions are an implementation of MDC2 with DES.</p>
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<p>MDC2() computes the MDC2 message digest of the <b>n</b> bytes at <b>d</b> and places it in <b>md</b> (which must have space for MDC2_DIGEST_LENGTH == 16 bytes of output). If <b>md</b> is NULL, the digest is placed in a static array.</p>
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<p>The following functions may be used if the message is not completely stored in memory:</p>
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<p>MDC2_Init() initializes a <b>MDC2_CTX</b> structure.</p>
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<p>MDC2_Update() can be called repeatedly with chunks of the message to be hashed (<b>len</b> bytes at <b>data</b>).</p>
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<p>MDC2_Final() places the message digest in <b>md</b>, which must have space for MDC2_DIGEST_LENGTH == 16 bytes of output, and erases the <b>MDC2_CTX</b>.</p>
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<p>Applications should use the higher level functions <a href="../man3/EVP_DigestInit.html">EVP_DigestInit(3)</a> etc. instead of calling the hash functions directly.</p>
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<h1 id="RETURN-VALUES">RETURN VALUES</h1>
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<p>MDC2() returns a pointer to the hash value.</p>
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<p>MDC2_Init(), MDC2_Update() and MDC2_Final() return 1 for success, 0 otherwise.</p>
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<h1 id="CONFORMING-TO">CONFORMING TO</h1>
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<p>ISO/IEC 10118-2:2000 Hash-Function 2, with DES as the underlying block cipher.</p>
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<h1 id="SEE-ALSO">SEE ALSO</h1>
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<p><a href="../man3/EVP_DigestInit.html">EVP_DigestInit(3)</a></p>
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<h1 id="HISTORY">HISTORY</h1>
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<p>All of these functions were deprecated in OpenSSL 3.0.</p>
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<h1 id="COPYRIGHT">COPYRIGHT</h1>
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<p>Copyright 2000-2020 The OpenSSL Project Authors. All Rights Reserved.</p>
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<p>Licensed under the Apache License 2.0 (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at <a href="https://www.openssl.org/source/license.html">https://www.openssl.org/source/license.html</a>.</p>
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</body>
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</html>
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