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+.\" md5sum.1 -- 
+.\" Public Domain 1995 Rik Faith (faith@cs.unc.edu)
+.\" Revised: Sat Feb 11 12:16:48 1995 by faith@cs.unc.edu
+.\" "
+.TH MD5SUM 1 "11 February 1995" "Linux 1.0" "Linux Programmer's Manual"
+.SH NAME
+md5sum \- generate/check MD5 message digests
+.SH SYNOPSIS
+.BR "md5sum [" \-bv "] [" \-c
+.BR "[ " file " ] ]"
+.br
+.BR "md5sum " file " ..."
+.SH DESCRIPTION
+.B md5sum
+generates and checks MD5 message digests, as described in RFC-1321.  The
+"message digest" produced can be thought of as a 128-bit "signature" of the
+input file.  Typically,
+.B md5sum
+is used to verify the integrity of files made available for distribution
+via anonymous ftp (for example, announcements for new versions of
+.BR irc(1)
+usually contain MD5 signatures).
+.P
+Message digests for a tree of files can be generated with a command similar
+to the following:
+.RS
+.sp
+find . -type f -print | xargs md5sum
+.sp
+.RE
+The output of this command is suitable as input for the
+.B \-c
+option.
+.SH OPTIONS
+.TP
+.BI "\-c [" file "]"
+Check message digests.  Input is taken from
+.B stdin
+or from the spcified
+.IR file .
+The input should be in the same format as the output generated by
+.BR md5sum .
+.TP
+.B \-v
+Verbose.  Print file names when checking.
+.TP
+.B \-b
+Read files in binary mode (otherwise, end-of-file conventions will be
+ignored).
+.SH HISTOY
+The
+.B md5sum
+program was written by Branko Lankester and may be freely distributed.  The
+original source code is in the MIT PGP 2.6.2 distribution.  Those concerned
+about the integrity of this version should obtain the original sources and
+compile their own version.
+.PP
+The underlying implementation of Ron Rivest's MD5 algorithm was written by
+Colin Plumb and is in the Public Domain.  (Equivalent code is also
+available from RSA Data Security, Inc.)
+.SH "SEE ALSO"
+.BR sum (1),
+.BR cksum (1),
+.BR pgp (1)