/usr/man/cat.1/dgst.1.Z(/usr/man/cat.1/dgst.1.Z)

     DGST(1)                0.9.6h (2000-09-04)                DGST(1)

     NAME
          dgst, md5, md4, md2, sha1, sha, mdc2, ripemd160 - message
          digests

     SYNOPSIS
          openssl dgst
          [-md5|-md4|-md2|-sha1|-sha|-mdc2|-ripemd160|-dss1] [-c] [-d]
          [-hex] [-binary] [-out filename] [-sign filename] [-verify
          filename] [-prverify filename] [-signature filename]
          [file...]

          [md5|md4|md2|sha1|sha|mdc2|ripemd160] [-c] [-d] [file...]

     DESCRIPTION
          The digest functions output the message digest of a supplied
          file or files in hexadecimal form. They can also be used for
          digital signing and verification.

     OPTIONS
          -c  print out the digest in two digit groups separated by
              colons, only relevant if hex format output is used.

          -d  print out BIO debugging information.

          -hex
              digest is to be output as a hex dump. This is the
              default case for a "normal" digest as opposed to a
              digital signature.

          -binary
              output the digest or signature in binary form.

          -out filename
              filename to output to, or standard output by default.

          -sign filename
              digitally sign the digest using the private key in
              "filename".

          -verify filename
              verify the signature using the the public key in
              "filename".  The output is either "Verification OK" or
              "Verification Failure".

          -prverify filename
              verify the signature using the  the private key in
              "filename".

          -signature filename
              the actual signature to verify.

          -rand file(s)

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     DGST(1)                0.9.6h (2000-09-04)                DGST(1)

              a file or files containing random data used to seed the
              random number generator, or an EGD socket (see
              RAND_egd(3)).  Multiple files can be specified separated
              by a OS-dependent character.  The separator is ; for
              MS-Windows, , for OpenVMS, and : for all others.

          file...
              file or files to digest. If no files are specified then
              standard input is used.

     NOTES
          The digest of choice for all new applications is SHA1. Other
          digests are however still widely used.

          If you wish to sign or verify data using the DSA algorithm
          then the dss1 digest must be used.

          A source of random numbers is required for certain signing
          algorithms, in particular DSA.

          The signing and verify options should only be used if a
          single file is being signed or verified.

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