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 1.6.1 2014-07-22 hmac256(1)
libgcrypt 1.6.1 - Generated Sun Aug 24 19:31:43 CDT 2014