1994-10-30 00:58:02 +01:00
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.TH MD5 1 "Feb 14, 1994"
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.SH NAME
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md5 \- calculate a message-digest fingerprint (checksum) for a file
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.SH SYNOPSIS
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.B md5
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1995-02-26 02:55:31 +01:00
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[ -p | -t | -x | -sstring | filename(s) ]
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1994-10-30 00:58:02 +01:00
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.SH DESCRIPTION
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.B md5
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takes as input a message of arbitrary length and produces
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as output a 128-bit "fingerprint" or "message digest" of the input.
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It is conjectured that it is computationally infeasible to produce
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two messages having the same message digest, or to produce any
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message having a given prespecified target message digest.
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The MD5 algorithm is intended for digital signature applications, where a
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large file must be "compressed" in a secure manner before being
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encrypted with a private (secret) key under a public-key cryptosystem
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such as
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.I RSA.
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.SH OPTIONS
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The following four options may be used in any combination, except
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that
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.B "filename(s)"
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must be the last objects on the command line.
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.in +5
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.PP
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.B -sstring
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prints a checksum of the given "string".
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.PP
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1995-02-26 02:55:31 +01:00
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.B -p
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echos stdin to stdout and appends the MD5 sum to stdout.
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.PP
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1994-10-30 00:58:02 +01:00
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.B -t
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runs a built-in time trial.
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.PP
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.B -x
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runs a built-in test script.
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.PP
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.B filename(s)
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prints a checksum(s) for each of the files.
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.SH "SEE ALSO"
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1994-12-12 00:29:20 +01:00
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.BR cksum (1)
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1994-10-30 00:58:02 +01:00
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.PP
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RFC 1321 describes in detail the MD2, MD4, and MD5 message-digest algorithms.
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.SH ACKNOWLEDGEMENTS
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This program is placed in the public domain for free general use by
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RSA Data Security.
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