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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.

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