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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@hsxx.drive.ne.jp" /> </head> <body style="background-color: white"> <!-- INDEX BEGIN --> <div name="index"> <p><a name="__index__"></a></p> <ul> <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> <hr name="index" /> </div> <!-- INDEX END --> <p> </p> <hr /> <h1><a name="name">NAME</a></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> <p> </p> <hr /> <h1><a name="synopsis">SYNOPSIS</a></h1> <pre> #include <openssl/md2.h></pre> <pre> unsigned char *MD2(const unsigned char *d, unsigned long n, unsigned char *md);</pre> <pre> 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);</pre> <pre> #include <openssl/md4.h></pre> <pre> unsigned char *MD4(const unsigned char *d, unsigned long n, unsigned char *md);</pre> <pre> 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);</pre> <pre> #include <openssl/md5.h></pre> <pre> unsigned char *MD5(const unsigned char *d, unsigned long n, unsigned char *md);</pre> <pre> 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);</pre> <p> </p> <hr /> <h1><a name="description">DESCRIPTION</a></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 <strong>n</strong> bytes at <strong>d</strong> and place it in <strong>md</strong> (which must have space for MD2_DIGEST_LENGTH == MD4_DIGEST_LENGTH == MD5_DIGEST_LENGTH == 16 bytes of output). If <strong>md</strong> 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 <strong>MD2_CTX</strong> structure.</p> <p>MD2_Update() can be called repeatedly with chunks of the message to be hashed (<strong>len</strong> bytes at <strong>data</strong>).</p> <p>MD2_Final() places the message digest in <strong>md</strong>, which must have space for MD2_DIGEST_LENGTH == 16 bytes of output, and erases the <strong>MD2_CTX</strong>.</p> <p>MD4_Init(), MD4_Update(), MD4_Final(), MD5_Init(), MD5_Update(), and MD5_Final() are analogous using an <strong>MD4_CTX</strong> and <strong>MD5_CTX</strong> structure.</p> <p>Applications should use the higher level functions <em>EVP_DigestInit(3)</em> etc. instead of calling the hash functions directly.</p> <p> </p> <hr /> <h1><a name="note">NOTE</a></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> <p> </p> <hr /> <h1><a name="return_values">RETURN VALUES</a></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> <p> </p> <hr /> <h1><a name="conforming_to">CONFORMING TO</a></h1> <p>RFC 1319, <a href="http://www.ietf.org/rfc/rfc1320.txt" class="rfc">RFC 1320</a>, <a href="http://www.ietf.org/rfc/rfc1321.txt" class="rfc">RFC 1321</a></p> <p> </p> <hr /> <h1><a name="see_also">SEE ALSO</a></h1> <p><em>EVP_DigestInit(3)</em></p> <p> </p> <hr /> <h1><a name="copyright">COPYRIGHT</a></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>