mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-28 11:57:28 +00:00
47 lines
1.3 KiB
Groff
47 lines
1.3 KiB
Groff
.TH MD5 1 "Feb 14, 1994"
|
|
.SH NAME
|
|
md5 \- calculate a message-digest fingerprint (checksum) for a file
|
|
.SH SYNOPSIS
|
|
.B md5
|
|
[ -p | -t | -x | -sstring | filename(s) ]
|
|
.SH DESCRIPTION
|
|
.B md5
|
|
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 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
|
|
.I RSA.
|
|
.SH OPTIONS
|
|
The following four options may be used in any combination, except
|
|
that
|
|
.B "filename(s)"
|
|
must be the last objects on the command line.
|
|
.in +5
|
|
.PP
|
|
.B -sstring
|
|
prints a checksum of the given "string".
|
|
.PP
|
|
.B -p
|
|
echos stdin to stdout and appends the MD5 sum to stdout.
|
|
.PP
|
|
.B -t
|
|
runs a built-in time trial.
|
|
.PP
|
|
.B -x
|
|
runs a built-in test script.
|
|
.PP
|
|
.B filename(s)
|
|
prints a checksum(s) for each of the files.
|
|
.SH "SEE ALSO"
|
|
.BR cksum (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.
|