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+.\"	$OpenBSD: md5.9,v 1.14 2015/11/24 14:58:56 jmc Exp $
+.\"
+.\" Copyright (c) 1996	Michael Shalayeff
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.Dd $Mdocdate: November 24 2015 $
+.Dt MD5INIT 9
+.Os
+.Sh NAME
+.Nm MD5Init ,
+.Nm MD5Transform
+.Nd message digest routines
+.Sh SYNOPSIS
+.In sys/kernel.h
+.Ft void
+.Fn MD5Init "u_int32_t buf[4]"
+.Ft void
+.Fn MD5Transform "u_int32_t buf[4]" "u_int32_t const in[16]"
+.Sh DESCRIPTION
+The
+.Nm
+module implements the RSA Data Security, Inc.
+MD5 Message-Digest Algorithm (MD5).
+It produces 128-bit MD5 Digest of data.
+.Bl -hang -width MD5Transform
+.It Fn MD5Init
+must be called just before
+.Fn MD5Transform
+will be used to produce a digest.
+The
+.Fa buf
+argument is the storage for the digest being produced on subsequent
+calls to the
+.Fn MD5Transform
+routine.
+.It Fn MD5Transform
+is the core of the MD5 algorithm, this alters an existing MD5 hash
+kept in
+.Fa buf
+to reflect the addition of 16 longwords
+of new data passed in
+.Fa in
+argument.
+.El
+.Sh COPYRIGHTS
+The code for MD5 transform was taken from Colin Plumb's
+implementation, which has been placed in the public domain.
+The MD5 cryptographic checksum was devised by Ronald Rivest, and is
+documented in RFC 1321, "The MD5 Message Digest Algorithm".
+.Sh SEE ALSO
+.Xr random 4 ,
+.Xr arc4random 9