NAME    [Toc]    [Back]

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

SYNOPSIS    [Toc]    [Back]

     rmd160 [-p | -t | -x | -c [checklist ...] | -s string | file
...]

DESCRIPTION    [Toc]    [Back]

     rmd160 takes as input a message of arbitrary length and produces as output
  a  160-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
     prespecified target message digest.

     The RMD-160 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 RSA.

     The options are as follows:

     -c [checklist ...]
             Compares   all   checksums  contained  in  the  file
checklist with newly
             computed  checksums  for  the  corresponding  files.
Output consists
             of  the  digest  used,  the  file name, and an OK or
FAILED for the
             result of the comparison.  This will validate any of
the supported
  checksums  (see cksum(1)).  If no file is given,
stdin is used.

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

     -s string
             Prints a checksum of the given string.

     -t      Runs a built-in time trial.

     -x      Runs a built-in test script.

     The  RMD-160  sum of each file listed on the command line is
printed after
     the options are processed.

SEE ALSO    [Toc]    [Back]

     cksum(1), md5(1), sha1(1)

     RMD-160 is part of  the  ISO  draft  standard  "ISO/IEC  DIS
10118-3" on dedicated
 hash functions.

OpenBSD      3.6                          April      30,     2004