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<?xml version="1.0" ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>MD5</title> <meta http-equiv="content-type" content="text/html; charset=utf-8" /> <link rev="made" href="mailto:root@localhost" /> </head> <body> <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> </ul> <h1 id="NAME">NAME</h1> <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 <openssl/md2.h> 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 <openssl/md4.h> 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 <openssl/md5.h> 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> <h1 id="NOTE">NOTE</h1> <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>RFC 1319, RFC 1320, RFC 1321</p> <h1 id="SEE-ALSO">SEE ALSO</h1> <p><a href="../man3/EVP_DigestInit.html">EVP_DigestInit(3)</a></p> <h1 id="COPYRIGHT">COPYRIGHT</h1> <p>Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.</p> <p>Licensed under the OpenSSL license (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> </body> </html>