MD5(1) UNIX System V (Feb 14, 1994) MD5(1)
NAME
md5 - calculate a message-digest fingerprint (checksum) for
a file
SYNOPSIS
md5 [ -t | -x | -sstring | filename(s) ]
DESCRIPTION
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 RSA.
OPTIONS
The following four options may be used in any combination,
except that filename(s) must be the last objects on the
command line.
-sstring prints a checksum of the given "string".
-t runs a built-in time trial.
-x runs a built-in test script.
filename(s) prints a checksum(s) for each of the files.
SEE ALSO
sum(1)
RFC 1321 describes in detail the MD2, MD4, and MD5 message-
digest algorithms.
ACKNOWLEDGEMENTS
This program is placed in the public domain for free general
use by RSA Data Security.
Page 1 (printed 2/13/99)
