1.\" $OpenBSD: md5.9,v 1.5 2001/08/03 15:21:17 mpech 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.Nd message digest routines 37.Sh SYNOPSIS 38.Fd #include <sys/kernel.h> 39.Va void MD5Init(u_int32_t buf[4]); 40.br 41.Va void MD5Transform(u_int32_t buf[4], u_int32_t const in[16]); 42.br 43.Sh DESCRIPTION 44The 45.Nm 46module implements the RSA Data Security, Inc. MD5 Message-Digest Algorithm 47(MD5). 48It produces 128-bit MD5 Digest of data. 49.Pp 50.Bl -hang -width MD5Transform 51.It Pa MD5Init 52must be called just before 53.Fn MD5Transform 54will be used to produce a digest. 55The 56.Fa buf 57argument is the storage for the digest being produced on subsequent 58calls to the 59.Fn MD5Transform 60routine. 61.It Pa MD5Transform 62is the core of the MD5 algorithm, this alters an existing MD5 hash 63kept in 64.Fa buf 65to reflect the addition of 16 longwords 66of new data passed in 67.Fa in 68argument. 69.El 70.Sh COPYRIGHTS 71The code for MD5 transform was taken from Colin Plumb's 72implementation, which has been placed in the public domain. 73The MD5 cryptographic checksum was devised by Ronald Rivest, and is 74documented in RFC 1321, "The MD5 Message Digest Algorithm". 75.Sh SEE ALSO 76.Xr random 4 , 77.Xr random 9 78