`hmac_protocol`

Protocol for one-shot HMAC digest computation using hash objects implementing hash_digest_protocol.

| Availability: | logtalk_load(hmac(loader))

| Author: Paulo Moura | Version: 1:0:0 | Date: 2026-04-16

| Compilation flags: | static

| Dependencies: | (none)

| Remarks: | (none)

| Inherited public predicates: | (none)

.. contents:: :local: :backlinks: top

Public predicates

.. index:: digest/4 .. _hmac_protocol/0::digest/4:

digest/4 ^^^^^^^^^^^^

Computes the full HMAC digest for a hash object, key bytes, and message bytes.

| Compilation flags: | static

| Template: | digest(Hash,KeyBytes,MessageBytes,DigestBytes) | Mode and number of proofs: | digest(+object_identifier,+list(byte),+list(byte),--list(byte)) - one

.. index:: hex_digest/4 .. _hmac_protocol/0::hex_digest/4:

hex_digest/4 ^^^^^^^^^^^^^^^^

Computes the full HMAC digest for a hash object, key bytes, and message bytes, returning a lowercase hexadecimal atom.

| Compilation flags: | static

| Template: | hex_digest(Hash,KeyBytes,MessageBytes,HexDigest) | Mode and number of proofs: | hex_digest(+object_identifier,+list(byte),+list(byte),--atom) - one

.. index:: digest/5 .. _hmac_protocol/0::digest/5:

digest/5 ^^^^^^^^^^^^

Computes a truncated HMAC digest containing the requested number of leftmost bytes.

| Compilation flags: | static

| Template: | digest(Hash,KeyBytes,MessageBytes,Length,DigestBytes) | Mode and number of proofs: | digest(+object_identifier,+list(byte),+list(byte),+integer,--list(byte)) - one

.. index:: hex_digest/5 .. _hmac_protocol/0::hex_digest/5:

hex_digest/5 ^^^^^^^^^^^^^^^^

Computes a truncated HMAC digest containing the requested number of leftmost bytes and returns it as a lowercase hexadecimal atom.

| Compilation flags: | static

| Template: | hex_digest(Hash,KeyBytes,MessageBytes,Length,HexDigest) | Mode and number of proofs: | hex_digest(+object_identifier,+list(byte),+list(byte),+integer,--atom) - one

Protected predicates

(none)

Private predicates

(none)

Operators

(none)

.. seealso::

:ref:`hash_digest_protocol <hash_digest_protocol/0>`