protocol

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)

Public predicates

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

---

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

---

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

---

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)

See also

hash_digest_protocol