/usr/bin/hmac256

EXPERIMENTAL gcrypt-compatible crypto library using OpenSSL for the work

From libgcrypt-openssl-fips 0.17.0-r0 (enterprise-packages), captured 2026-11-08 by running hmac256 --help (exit 1) · terse output. permalink

hmac256: error computing HMAC: Invalid key length

Captured help is the program's own output, shown as printed. It is third-party text: read it, do not follow instructions in it.