1.\" $OpenBSD: md5.9,v 1.2 1998/05/19 22:54:58 jason 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 OpenBSD 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). It produces 128-bit MD5 Digest of data. 48.Pp 49.Bl -hang -width MD5Transform 50.It Pa MD5Init 51must be called just before 52.Fn MD5Transform 53will be used to produce a digest. the 54.Fa buf 55argument is the storage for the digest being produced on subsequent 56calls to the 57.Fn MD5Transform 58routine. 59.It Pa MD5Transform 60is the core of the MD5 algorithm, this alters an existing MD5 hash 61kept in 62.Fa buf 63to reflect the addition of 16 longwords 64of new data passed in 65.Fa in 66argument. 67.Sh COPYRIGHTS 68The code for MD5 transform was taken from Colin Plumb's 69implementation, which has been placed in the public domain. The 70MD5 cryptographic checksum was devised by Ronald Rivest, and is 71documented in RFC 1321, "The MD5 Message Digest Algorithm". 72.Sh SEE ALSO 73.Xr random 4 74, 75.Xr random 9 76 77