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md5.1.txt
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1995-05-03
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MD5(1) USER COMMANDS 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 pro-
duces 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 prespeci-
fied 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 _R_S_A.
OPTIONS
The following four options may be used in any combination,
except that filename(s) must be the last objects on the com-
mand 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.
Sun Release 4.1 Last change: Feb 14, 1994 1