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 HMAC256(1)                    Libgcrypt 1.8.7                    HMAC256(1)
 Libgcrypt                                                         Libgcrypt


      hmac256 - Compute an HMAC-SHA-256 MAC

      hmac256 [--binary] key [FILENAME]

      This is a standalone HMAC-SHA-256 implementation used to compute an
      HMAC-SHA-256 message authentication code.  The tool has originally
      been developed as a second implementation for Libgcrypt to allow
      comparing against the primary implementation and to be used for
      internal consistency checks.  It should not be used for sensitive data
      because no mechanisms to clear the stack etc are used.

      The code has been written in a highly portable manner and requires
      only a few standard definitions to be provided in a config.h file.

      hmac256 is commonly invoked as

        hmac256 "This is my key" foo.txt

      This compute the MAC on the file foo.txt using the key given on the
      command line.

      hmac256 understands these options:

           Print the MAC as a binary string.  The default is to print the
           MAC encoded has lower case hex digits.

           Print version of the program and exit.


                                    - 1 -      Formatted:  February 28, 2024