61 lines
1.4 KiB
Groff
61 lines
1.4 KiB
Groff
.Dd Feburary 14, 1994
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.Dt MD5 1
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.Os
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.Sh NAME
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.Nm md5
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.Nd calculate a message-digest fingerprint (checksum) for a file
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.Sh SYNOPSIS
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.Nm
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.Op Fl p
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.Op Fl t
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.Op Fl x
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.Op Fl s Ns Ar string
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.Op Ar filename Ns Pq s
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.Sh DESCRIPTION
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.Nm
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takes as input a message of arbitrary length and produces
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as output a 128-bit
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.Dq fingerprint
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or
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.Dq message digest
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of the input. It is conjectured that it is computationally infeasible to
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produce 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
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.Dq compressed
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in a secure manner before being encrypted with a private
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.Pq secret
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key under a public-key cryptosystem such as
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.Em RSA .
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.Pp
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The following four options may be used in any combination, except
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that
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.Ar filename Ns Pq s
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must be the last objects on the command line.
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.Bl -tag -width Fl
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.It Fl s Ns Ar string
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prints a checksum of the given
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.Dq string .
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.It Fl p
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echos stdin to stdout and appends the MD5 sum to stdout.
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.It Fl t
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runs a built-in time trial.
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.It Fl x
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runs a built-in test script.
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.It Ar filename Ns Pq s
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prints a checksum
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.Pq s
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for each of the files.
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.El
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.Sh SEE ALSO
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.Xr cksum 1
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.Rs
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.%A R. Rivest
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.%T The MD5 Message-Digest Algorithm
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.%O RFC1321
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.Re
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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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