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 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.

OPTIONS

hmac256 understands these options:


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


--version
Print version of the program and exit.

SEE ALSO

sha256sum(1)

Libgcrypt 1.10.3 2024-04-22 HMAC256(1)