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.\" $OpenBSD: md5.1,v 1.8 2000/03/17 18:15:14 aaron Exp $
.\"
.Dd February 14, 1994
.Dt MD5 1
.Os
.Sh NAME
.Nm md5
.Nd calculate a message-digest fingerprint (checksum) for a file
.Sh SYNOPSIS
.Nm md5
.Op Fl ptx
.Op Fl s Ar string
.Op Ar file ...
.Sh DESCRIPTION
.Nm
takes as input a message of arbitrary length and produces
as output a 128-bit "fingerprint" or "message digest" of the input.
It is conjectured that it is computationally infeasible to produce
two messages having the same message digest, or to produce any
message having a given prespecified target message digest.
The
.Em MD5
algorithm is intended for digital signature applications, where a
large file must be "compressed" in a secure manner before being
encrypted with a private (secret) key under a public-key cryptosystem
such as
.Em RSA .
.Sh OPTIONS
The following four options may be used in any combination and must
precede any files named on the command line.
The MD5
sum of each file listed on the command line is printed after the options
are processed.
.Bl -tag -width Fl
.It Fl s Ar string
Prints a checksum of the given
.Ar string .
.It Fl p
Echos stdin to stdout and appends the
.Em MD5
sum to stdout.
.It Fl t
Runs a built-in time trial.
.It Fl x
Runs a built-in test script.
.El
.Sh SEE ALSO
.Xr cksum 1 ,
.Xr rmd160 1 ,
.Xr sha1 1
.Pp
RFC 1321 describes in detail the MD2, MD4, and MD5 message-digest algorithms.
.Sh ACKNOWLEDGEMENTS
This program is placed in the public domain for free general use by
RSA Data Security.
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