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.\" Automatically generated by Pod::Man 4.11 (Pod::Simple 3.35) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" Set up some character translations and predefined strings. \*(-- will .\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left .\" double quote, and \*(R" will give a right double quote. \*(C+ will .\" give a nicer C++. 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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" 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 .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #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); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\s-1MD2, MD4,\s0 and \s-1MD5\s0 are cryptographic hash functions with a 128 bit output. .PP \&\s-1\fBMD2\s0()\fR, \s-1\fBMD4\s0()\fR, and \s-1\fBMD5\s0()\fR compute the \s-1MD2, MD4,\s0 and \s-1MD5\s0 message digest of the \fBn\fR bytes at \fBd\fR and place it in \fBmd\fR (which must have space for \s-1MD2_DIGEST_LENGTH\s0 == \s-1MD4_DIGEST_LENGTH\s0 == \s-1MD5_DIGEST_LENGTH\s0 == 16 bytes of output). If \fBmd\fR is \s-1NULL,\s0 the digest is placed in a static array. .PP The following functions may be used if the message is not completely stored in memory: .PP \&\fBMD2_Init()\fR initializes a \fB\s-1MD2_CTX\s0\fR structure. .PP \&\fBMD2_Update()\fR can be called repeatedly with chunks of the message to be hashed (\fBlen\fR bytes at \fBdata\fR). .PP \&\fBMD2_Final()\fR places the message digest in \fBmd\fR, which must have space for \s-1MD2_DIGEST_LENGTH\s0 == 16 bytes of output, and erases the \fB\s-1MD2_CTX\s0\fR. .PP \&\fBMD4_Init()\fR, \fBMD4_Update()\fR, \fBMD4_Final()\fR, \fBMD5_Init()\fR, \fBMD5_Update()\fR, and \&\fBMD5_Final()\fR are analogous using an \fB\s-1MD4_CTX\s0\fR and \fB\s-1MD5_CTX\s0\fR structure. .PP Applications should use the higher level functions \&\fBEVP_DigestInit\fR\|(3) etc. instead of calling the hash functions directly. .SH "NOTE" .IX Header "NOTE" \&\s-1MD2, MD4,\s0 and \s-1MD5\s0 are recommended only for compatibility with existing applications. In new applications, \s-1SHA\-1\s0 or \s-1RIPEMD\-160\s0 should be preferred. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\s-1\fBMD2\s0()\fR, \s-1\fBMD4\s0()\fR, and \s-1\fBMD5\s0()\fR return pointers to the hash value. .PP \&\fBMD2_Init()\fR, \fBMD2_Update()\fR, \fBMD2_Final()\fR, \fBMD4_Init()\fR, \fBMD4_Update()\fR, \&\fBMD4_Final()\fR, \fBMD5_Init()\fR, \fBMD5_Update()\fR, and \fBMD5_Final()\fR return 1 for success, 0 otherwise. .SH "CONFORMING TO" .IX Header "CONFORMING TO" \&\s-1RFC 1319, RFC 1320, RFC 1321\s0 .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBEVP_DigestInit\fR\|(3) .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2000\-2016 The OpenSSL Project Authors. All Rights Reserved. .PP Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.
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