1997-02-14 06:42:21 +00:00
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.\" $OpenBSD: md5.9,v 1.1 1996/04/17 21:40:14 mickey Exp $
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.\"
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.\" Copyright (c) 1996 Michael Shalayeff
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by Michael Shalayeff
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.\" 3. The name of the author may not be used to endorse or promote products
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.\" derived from this software without specific prior written permission
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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1999-08-28 00:22:10 +00:00
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.\" $FreeBSD$
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1999-07-12 21:02:10 +00:00
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.\"
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1997-02-14 06:42:21 +00:00
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.Dd April 17, 1996
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.Dt MD5 9
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.Os OpenBSD
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.Sh NAME
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.Nm MD5 ,
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.Nm MD5Init ,
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.Nm MD5Transform
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.Nd message digest routines
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.Sh SYNOPSIS
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1997-04-13 14:49:13 +00:00
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.Fd #include <sys/types.h>
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.Fd #include <sys/md5.h>
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.Ft void
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.Fn MD5Init "MD5_CTX *buf"
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.Ft void
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.Fn MD5Transform "u_int32_t buf[4]" "const unsigned char block[64]"
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.Sh DESCRIPTION
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The
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.Nm
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module implements the RSA Data Security, Inc. MD5 Message-Digest Algorithm
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(MD5). It produces 128-bit MD5 Digest of data.
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.Pp
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.Bl -hang -width MD5Transformxxx
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.It Pa MD5Init
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must be called just before
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.Fn MD5Transform
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2000-03-02 14:54:02 +00:00
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will be used to produce a digest.
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The
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1997-02-14 06:42:21 +00:00
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.Fa buf
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argument is the storage for the digest being produced on subsequent
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calls to the
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.Fn MD5Transform
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routine.
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.It Pa MD5Transform
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is the core of the MD5 algorithm, this alters an existing MD5 hash
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kept in
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.Fa buf
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to reflect the addition of 64 characters
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of new data passed in
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.Fa block
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argument.
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.Sh COPYRIGHTS
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The code for MD5 transform was taken from Colin Plumb's
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implementation, which has been placed in the public domain. The
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MD5 cryptographic checksum was devised by Ronald Rivest, and is
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documented in RFC 1321, "The MD5 Message Digest Algorithm".
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