.. index:: single: fips202_hash(RateBytes,Suffix,OutputBytes) .. _fips202_hash/3:

.. rst-class:: right

object

fips202_hash(RateBytes,Suffix,OutputBytes)

Common implementation of the standardized FIPS 202 SHA-3 and SHAKE variants using the Keccak-f[1600] permutation.

| Availability: | logtalk_load(hashes(loader))

| Author: Paulo Moura | Version: 1:1:0 | Date: 2026-04-15

| Compilation flags: | static, context_switching_calls

| Implements: | public :ref:`hash_protocol <hash_protocol/0>` | Uses: | :ref:`hash_common_32 <hash_common_32/0>` | :ref:`hash_common_64 <hash_common_64/0>` | :ref:`list <list/0>`

| Remarks: | (none)

| Inherited public predicates: |  :ref:`hash_protocol/0::hash/2`  

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

Public predicates

(no local declarations; see entity ancestors if any)

Protected predicates

.. index:: absorb/2 .. _fips202_hash/3::absorb/2:

absorb/2 ^^^^^^^^^^^^

Absorbs the input bytes into the Keccak state and returns the resulting state after the final padded block permutation.

| Compilation flags: | static

| Template: | absorb(Bytes,State) | Mode and number of proofs: | absorb(+list(byte),--list(integer)) - one

---

.. index:: squeeze/3 .. _fips202_hash/3::squeeze/3:

squeeze/3 ^^^^^^^^^^^^^

Squeezes the requested number of output bytes from a Keccak state.

| Compilation flags: | static

| Template: | squeeze(State,OutputBytes,DigestBytes) | Mode and number of proofs: | squeeze(+list(integer),+integer,--list(byte)) - one

---

Private predicates

(no local declarations; see entity ancestors if any)

Operators

(none)