freebsd-skq/sbin/md5/md5.1

.\" $FreeBSD$
.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 prtx
.Op Fl s Ar string
.Op Ar file ...
.Sh DESCRIPTION
.Nm Md5
takes as input a message of arbitrary length and produces
as output a 128-bit
.Dq fingerprint
or
.Dq 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 MD5 algorithm is intended for digital signature applications, where a
large file must be
.Dq compressed
in a secure manner before being encrypted with a private
.Pq secret
key under a public-key cryptosystem such as
.Em RSA .
.Pp
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 indent
.It Fl s Ar string
Print a checksum of the given
.Ar string .
.It Fl p
Echo stdin to stdout and appends the MD5 sum to stdout.
.It Fl r
Reverses the format of the output.  This helps with visual diffs.  Does nothing
when combined with the 
.Fl stpx
options.
.It Fl t
Run a built-in time trial.
.It Fl x
Run a built-in test script.
.El
.Sh SEE ALSO
.Xr cksum 1
.Rs
.%A R. Rivest
.%T The MD5 Message-Digest Algorithm
.%O RFC1321
.Re
.Sh ACKNOWLEDGMENTS
This program is placed in the public domain for free general use by
RSA Data Security.
Add a new "-r" (right) option that reverses the order a filename and the hash is printed. This aids visual diffs. 1999-11-07 04:14:55 +00:00			`.\" $FreeBSD$`
fix a few spelling changes Submitted by: Josh Gilliam Closes PR's: 4429, 4431-4438 PS: He has agreed to submit all contrib fixes back to the original author. 1997-08-30 12:22:49 +00:00			`.Dd February 14, 1994`
mdoc'ify man page 1997-03-02 21:43:10 +00:00			`.Dt MD5 1`
			`.Os`
			`.Sh NAME`
			`.Nm md5`
			`.Nd calculate a message-digest fingerprint (checksum) for a file`
			`.Sh SYNOPSIS`
Correct use of .Nm. Spelling. Add rcsid, remove unused #includes, use err(3). 1998-07-06 07:04:50 +00:00			`.Nm md5`
Add a new "-r" (right) option that reverses the order a filename and the hash is printed. This aids visual diffs. 1999-11-07 04:14:55 +00:00			`.Op Fl prtx`
Get md5(1) to use getopt(3). Also some minor -Wall cleaning while here. PR: 5387 Submitted by: Matthew Hunt <mph@pobox.com> 1997-12-29 03:40:37 +00:00			`.Op Fl s Ar string`
			`.Op Ar file ...`
mdoc'ify man page 1997-03-02 21:43:10 +00:00			`.Sh DESCRIPTION`
Correct use of .Nm. Spelling. Add rcsid, remove unused #includes, use err(3). 1998-07-06 07:04:50 +00:00			`.Nm Md5`
Incorproate version of md5 placed into public domain by RSA. 1994-10-29 23:58:02 +00:00			`takes as input a message of arbitrary length and produces`
mdoc'ify man page 1997-03-02 21:43:10 +00:00			`as output a 128-bit`
			`.Dq fingerprint`
			`or`
			`.Dq 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`
Incorproate version of md5 placed into public domain by RSA. 1994-10-29 23:58:02 +00:00			`message having a given prespecified target message digest.`
			`The MD5 algorithm is intended for digital signature applications, where a`
mdoc'ify man page 1997-03-02 21:43:10 +00:00			`large file must be`
			`.Dq compressed`
			`in a secure manner before being encrypted with a private`
			`.Pq secret`
			`key under a public-key cryptosystem such as`
			`.Em RSA .`
			`.Pp`
Get md5(1) to use getopt(3). Also some minor -Wall cleaning while here. PR: 5387 Submitted by: Matthew Hunt <mph@pobox.com> 1997-12-29 03:40:37 +00:00			`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.`
Correct use of .Nm. Spelling. Add rcsid, remove unused #includes, use err(3). 1998-07-06 07:04:50 +00:00			`.Bl -tag -width indent`
Get md5(1) to use getopt(3). Also some minor -Wall cleaning while here. PR: 5387 Submitted by: Matthew Hunt <mph@pobox.com> 1997-12-29 03:40:37 +00:00			`.It Fl s Ar string`
Correct use of .Nm. Spelling. Add rcsid, remove unused #includes, use err(3). 1998-07-06 07:04:50 +00:00			`Print a checksum of the given`
Get md5(1) to use getopt(3). Also some minor -Wall cleaning while here. PR: 5387 Submitted by: Matthew Hunt <mph@pobox.com> 1997-12-29 03:40:37 +00:00			`.Ar string .`
mdoc'ify man page 1997-03-02 21:43:10 +00:00			`.It Fl p`
Correct use of .Nm. Spelling. Add rcsid, remove unused #includes, use err(3). 1998-07-06 07:04:50 +00:00			`Echo stdin to stdout and appends the MD5 sum to stdout.`
Add a new "-r" (right) option that reverses the order a filename and the hash is printed. This aids visual diffs. 1999-11-07 04:14:55 +00:00			`.It Fl r`
			`Reverses the format of the output. This helps with visual diffs. Does nothing`
			`when combined with the`
			`.Fl stpx`
			`options.`
mdoc'ify man page 1997-03-02 21:43:10 +00:00			`.It Fl t`
Correct use of .Nm. Spelling. Add rcsid, remove unused #includes, use err(3). 1998-07-06 07:04:50 +00:00			`Run a built-in time trial.`
mdoc'ify man page 1997-03-02 21:43:10 +00:00			`.It Fl x`
Correct use of .Nm. Spelling. Add rcsid, remove unused #includes, use err(3). 1998-07-06 07:04:50 +00:00			`Run a built-in test script.`
mdoc'ify man page 1997-03-02 21:43:10 +00:00			`.El`
			`.Sh SEE ALSO`
			`.Xr cksum 1`
			`.Rs`
			`.%A R. Rivest`
			`.%T The MD5 Message-Digest Algorithm`
			`.%O RFC1321`
			`.Re`
Correct use of .Nm. Spelling. Add rcsid, remove unused #includes, use err(3). 1998-07-06 07:04:50 +00:00			`.Sh ACKNOWLEDGMENTS`
Incorproate version of md5 placed into public domain by RSA. 1994-10-29 23:58:02 +00:00			`This program is placed in the public domain for free general use by`
			`RSA Data Security.`