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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 as lower case hex digits. --version Print version of the program and exit. SEE ALSO sha256sum(1) Libgcrypt 1.11.0 2025-04-12 HMAC256(1)
NAME | SYNOPSIS | DESCRIPTION | OPTIONS | SEE ALSO
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