HMAC uses a key to compute an authentication code for a message. Both inputs are encoded as UTF-8; the result is shown in hexadecimal.

Algorithm SHA-1SHA-224SHA-256SHA-384SHA-512SHA-512/224SHA-512/256

Key (UTF-8)

Message (UTF-8)

HMAC-SHA-256, hex:

b613679a0814d9ec772f95d778c35fc5ff1697c493715653c6c712144292c5ad

Verify independently with OpenSSL:

printf '%s' '' | openssl dgst -sha256 -hmac ''