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.Dd April 17, 1996 32.Dt MD5 9 33.Os 34.Sh NAME 35.Nm MD5 , 36.Nm MD5Init , 37.Nm MD5Transform 38.Nd message digest routines 39.Sh SYNOPSIS 40.In sys/types.h 41.In sys/md5.h 42.Ft void 43.Fn MD5Init "MD5_CTX *buf" 44.Ft void 45.Fn MD5Transform "uint32_t buf[4]" "const unsigned char block[64]" 46.Sh DESCRIPTION 47The 48.Nm 49module implements the RSA Data Security, Inc.\& MD5 Message-Digest Algorithm 50(MD5). 51It produces 128-bit MD5 Digest of data. 52.Bl -hang -width MD5Transformxxx 53.It Pa MD5Init 54must be called just before 55.Fn MD5Transform 56will be used to produce a digest. 57The 58.Fa buf 59argument is the storage for the digest being produced on subsequent 60calls to the 61.Fn MD5Transform 62routine. 63.It Pa MD5Transform 64is the core of the MD5 algorithm, this alters an existing MD5 hash 65kept in 66.Fa buf 67to reflect the addition of 64 characters 68of new data passed in 69.Fa block 70argument. 71.El 72.Sh COPYRIGHTS 73The code for MD5 transform was taken from Colin Plumb's 74implementation, which has been placed in the public domain. 75The MD5 cryptographic checksum was devised by Ronald Rivest, and is 76documented in RFC 1321, "The MD5 Message Digest Algorithm". 77