4345758876
Avoid using parenthesis enclosure macros (.Pq and .Po/.Pc) with plain text. Not only this slows down the mdoc(7) processing significantly, but it also has an undesired (in this case) effect of disabling hyphenation within the entire enclosed block.
65 lines
1.6 KiB
Groff
65 lines
1.6 KiB
Groff
.\" $FreeBSD$
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.Dd February 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 pqrtx
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.Op Fl s Ar string
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.Op Ar
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.Sh DESCRIPTION
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.Nm Md5
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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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(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 options may be used in any combination and must
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precede any files named on the command line. The MD5
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sum of each file listed on the command line is printed after the options
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are processed.
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.Bl -tag -width indent
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.It Fl s Ar string
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Print a checksum of the given
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.Ar string .
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.It Fl p
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Echo stdin to stdout and appends the MD5 sum to stdout.
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.It Fl q
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Quiet mode - only the MD5 sum is printed out. Overrides the
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.Fl r
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option.
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.It Fl r
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Reverses the format of the output. This helps with visual diffs. Does nothing
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when combined with the
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.Fl ptx
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options.
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.It Fl t
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Run a built-in time trial.
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.It Fl x
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Run a built-in test script.
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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 ACKNOWLEDGMENTS
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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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