RMD160(1)                  OpenBSD Reference Manual                  RMD160(1)

NAME
     rmd160 - calculate a message-digest fingerprint (checksum) for a file



SYNOPSIS
     rmd160 [-ptx] [-s string] [file ...]

DESCRIPTION
     rmd160 takes as input a message of arbitrary length and produces as out-
     put a 160-bit "fingerprint" or "message digest" of the input.  It is con-
     jectured 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 RMD-160 algorithm is intended
     for digital signature applications, where a large file must be "com-
     pressed" in a secure manner before being encrypted with a private (se-
     cret) key under a public-key cryptosystem such as RSA.

OPTIONS
     The following four options may be used in any combination and must pre-
     cede any files named on the command line.  The RMD-160 sum of each file
     listed on the command line is printed after the options are processed.

     -s string   Prints a checksum of the given string.

     -p          Echos stdin to stdout and appends the RMD-160 sum to stdout.

     -t          Runs a built-in time trial.

     -x          Runs a built-in test script.

SEE ALSO
     cksum(1),  md5(1),  sha1(1)

     RMD-160 is part of the ISO draft standard  on dedicated hash functions.

ACKNOWLEDGEMENTS
     This program is placed in the public domain for free general use by RSA
     Data Security.

OpenBSD 2.6                      July 16, 1997                               1