1.\" $OpenBSD: md5.9,v 1.1 1996/04/17 21:40:14 mickey Exp $ 2.\" 3.\" Copyright (c) 1996 Michael Shalayeff 4.\" All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 3. All advertising materials mentioning features or use of this software 15.\" must display the following acknowledgement: 16.\" This product includes software developed by Michael Shalayeff 17.\" 3. The name of the author may not be used to endorse or promote products 18.\" derived from this software without specific prior written permission 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 24.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 25.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 29.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30.\" 31.\" $FreeBSD: src/share/man/man9/MD5.9,v 1.5.2.3 2001/12/17 11:30:18 ru Exp $ 32.\" $DragonFly: src/share/man/man9/MD5.9,v 1.2 2003/06/17 04:37:01 dillon Exp $ 33.\" 34.Dd April 17, 1996 35.Dt MD5 9 36.Os 37.Sh NAME 38.Nm MD5 , 39.Nm MD5Init , 40.Nm MD5Transform 41.Nd message digest routines 42.Sh SYNOPSIS 43.In sys/types.h 44.In sys/md5.h 45.Ft void 46.Fn MD5Init "MD5_CTX *buf" 47.Ft void 48.Fn MD5Transform "u_int32_t buf[4]" "const unsigned char block[64]" 49.Sh DESCRIPTION 50The 51.Nm 52module implements the RSA Data Security, Inc. MD5 Message-Digest Algorithm 53(MD5). It produces 128-bit MD5 Digest of data. 54.Pp 55.Bl -hang -width MD5Transformxxx 56.It Pa MD5Init 57must be called just before 58.Fn MD5Transform 59will be used to produce a digest. 60The 61.Fa buf 62argument is the storage for the digest being produced on subsequent 63calls to the 64.Fn MD5Transform 65routine. 66.It Pa MD5Transform 67is the core of the MD5 algorithm, this alters an existing MD5 hash 68kept in 69.Fa buf 70to reflect the addition of 64 characters 71of new data passed in 72.Fa block 73argument. 74.El 75.Sh COPYRIGHTS 76The code for MD5 transform was taken from Colin Plumb's 77implementation, which has been placed in the public domain. The 78MD5 cryptographic checksum was devised by Ronald Rivest, and is 79documented in RFC 1321, "The MD5 Message Digest Algorithm". 80