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HMAC256(1)			   Libgcrypt			    HMAC256(1)

NAME
       hmac256 - Compute an HMAC-SHA-256 MAC

SYNOPSIS
       hmac256 [--binary] key [FILENAME]

DESCRIPTION
       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  consis-
       tency  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.

OPTIONS
       hmac256 understands these options:

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

       --version
	      Print version of the program and exit.

SEE ALSO
       sha256sum(1)

Libgcrypt 1.8.4 		  2019-01-29			    HMAC256(1)