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<ul id="index">
  <li><a href="#NAME">NAME</a></li>
  <li><a href="#SYNOPSIS">SYNOPSIS</a></li>
  <li><a href="#DESCRIPTION">DESCRIPTION</a></li>
  <li><a href="#NOTE">NOTE</a></li>
  <li><a href="#RETURN-VALUES">RETURN VALUES</a></li>
  <li><a href="#CONFORMING-TO">CONFORMING TO</a></li>
  <li><a href="#SEE-ALSO">SEE ALSO</a></li>
  <li><a href="#COPYRIGHT">COPYRIGHT</a></li>
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<p>MD2, MD4, MD5, MD2_Init, MD2_Update, MD2_Final, MD4_Init, MD4_Update, MD4_Final, MD5_Init, MD5_Update, MD5_Final - MD2, MD4, and MD5 hash functions</p>

<h1 id="SYNOPSIS">SYNOPSIS</h1>

<pre><code> #include &lt;openssl/md2.h&gt;

unsigned char *MD2(const unsigned char *d, unsigned long n, unsigned char *md);

int MD2_Init(MD2_CTX *c);
 int MD2_Update(MD2_CTX *c, const unsigned char *data, unsigned long len);
 int MD2_Final(unsigned char *md, MD2_CTX *c);

#include &lt;openssl/md4.h&gt;

unsigned char *MD4(const unsigned char *d, unsigned long n, unsigned char *md);

int MD4_Init(MD4_CTX *c);
 int MD4_Update(MD4_CTX *c, const void *data, unsigned long len);
 int MD4_Final(unsigned char *md, MD4_CTX *c);

#include &lt;openssl/md5.h&gt;

unsigned char *MD5(const unsigned char *d, unsigned long n, unsigned char *md);

int MD5_Init(MD5_CTX *c);
 int MD5_Update(MD5_CTX *c, const void *data, unsigned long len);
 int MD5_Final(unsigned char *md, MD5_CTX *c);</code></pre>

<h1 id="DESCRIPTION">DESCRIPTION</h1>

<p>MD2, MD4, and MD5 are cryptographic hash functions with a 128 bit output.</p>

<p>MD2(), MD4(), and MD5() compute the MD2, MD4, and MD5 message digest of the <b>n</b> bytes at <b>d</b> and place it in <b>md</b> (which must have space for MD2_DIGEST_LENGTH == MD4_DIGEST_LENGTH == MD5_DIGEST_LENGTH == 16 bytes of output). If <b>md</b> is NULL, the digest is placed in a static array.</p>

<p>The following functions may be used if the message is not completely stored in memory:</p>

<p>MD2_Init() initializes a <b>MD2_CTX</b> structure.</p>

<p>MD2_Update() can be called repeatedly with chunks of the message to be hashed (<b>len</b> bytes at <b>data</b>).</p>

<p>MD2_Final() places the message digest in <b>md</b>, which must have space for MD2_DIGEST_LENGTH == 16 bytes of output, and erases the <b>MD2_CTX</b>.</p>

<p>MD4_Init(), MD4_Update(), MD4_Final(), MD5_Init(), MD5_Update(), and MD5_Final() are analogous using an <b>MD4_CTX</b> and <b>MD5_CTX</b> structure.</p>

<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>

<p>MD2, MD4, and MD5 are recommended only for compatibility with existing applications. In new applications, SHA-1 or RIPEMD-160 should be preferred.</p>

<h1 id="RETURN-VALUES">RETURN VALUES</h1>

<p>MD2(), MD4(), and MD5() return pointers to the hash value.</p>

<p>MD2_Init(), MD2_Update(), MD2_Final(), MD4_Init(), MD4_Update(), MD4_Final(), MD5_Init(), MD5_Update(), and MD5_Final() return 1 for success, 0 otherwise.</p>

<h1 id="CONFORMING-TO">CONFORMING TO</h1>

<p><a href="../man3/EVP_DigestInit.html">EVP_DigestInit(3)</a></p>

<h1 id="COPYRIGHT">COPYRIGHT</h1>

<p>Licensed under the OpenSSL license (the &quot;License&quot;). 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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