.. index:: single: paseto_v4
.. _paseto_v4/0:

.. rst-class:: right

**object**

``paseto_v4``
=============

PASETO v4.local and v4.public implementation for byte payloads.

| **Availability:** 
|    ``logtalk_load(paseto(loader))``

| **Author:** Paulo Moura
| **Version:** 1:0:0
| **Date:** 2026-08-08

| **Compilation flags:**
|    ``static, context_switching_calls``


| **Implements:**
|    ``public`` :ref:`paseto_protocol <paseto_protocol/0>`
| **Imports:**
|    ``public`` :ref:`paseto_helpers <paseto_helpers/0>`
| **Uses:**
|    :ref:`blake2b(Key,DigestSize) <blake2b/2>`
|    :ref:`crypto <crypto/0>`
|    :ref:`list <list/0>`
|    :ref:`type <type/0>`

| **Remarks:**
|    (none)

| **Inherited public predicates:**
|     :ref:`paseto_protocol/0::footer/2`  :ref:`paseto_protocol/0::local_decrypt/3`  :ref:`paseto_protocol/0::local_decrypt/5`  :ref:`paseto_protocol/0::local_encrypt/3`  :ref:`paseto_protocol/0::local_encrypt/5`  :ref:`paseto_protocol/0::local_key/1`  :ref:`paseto_protocol/0::public_keypair/2`  :ref:`paseto_protocol/0::public_sign/3`  :ref:`paseto_protocol/0::public_sign/5`  :ref:`paseto_protocol/0::public_verify/3`  :ref:`paseto_protocol/0::public_verify/5`  

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

Public predicates
-----------------

(no local declarations; see entity ancestors if any)

Protected predicates
--------------------

.. index:: local_encrypt_with_nonce/6
.. _paseto_v4/0::local_encrypt_with_nonce/6:

``local_encrypt_with_nonce/6``
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Encrypts a local payload using an explicit 32-byte nonce. Intended for deterministic conformance tests; production callers must use local_encrypt/3 or local_encrypt/5.

| **Compilation flags:**
|    ``static``

| **Template:**
|    ``local_encrypt_with_nonce(Key,Nonce,Payload,Footer,ImplicitAssertion,Token)``
| **Mode and number of proofs:**
|    ``local_encrypt_with_nonce(+list(byte),+list(byte),+list(byte),+list(byte),+list(byte),-atom)`` - ``one_or_error``

| **Exceptions:**
|    ``Key`` is a variable or a partial list:
|        ``instantiation_error``
|    ``Key`` is not a list of the required number of bytes:
|        ``type_error(list(byte,32),Key)``
|    ``Key`` contains a non-integer byte:
|        ``type_error(integer,Byte)``
|    ``Key`` contains an integer outside the byte range:
|        ``domain_error(byte,Byte)``
|    ``Nonce`` is a variable or a partial list:
|        ``instantiation_error``
|    ``Nonce`` is not a list of the required number of bytes:
|        ``type_error(list(byte,32),Nonce)``
|    ``Nonce`` contains a non-integer byte:
|        ``type_error(integer,Byte)``
|    ``Nonce`` contains an integer outside the byte range:
|        ``domain_error(byte,Byte)``
|    ``Payload`` is a variable or a partial list:
|        ``instantiation_error``
|    ``Payload`` is not a list of the required number of bytes:
|        ``type_error(list(byte,32),Payload)``
|    ``Payload`` contains a non-integer byte:
|        ``type_error(integer,Byte)``
|    ``Payload`` contains an integer outside the byte range:
|        ``domain_error(byte,Byte)``
|    ``Footer`` is a variable or a partial list:
|        ``instantiation_error``
|    ``Footer`` is not a list of the required number of bytes:
|        ``type_error(list(byte,32),Footer)``
|    ``Footer`` contains a non-integer byte:
|        ``type_error(integer,Byte)``
|    ``Footer`` contains an integer outside the byte range:
|        ``domain_error(byte,Byte)``
|    ``ImplicitAssertion`` is a variable or a partial list:
|        ``instantiation_error``
|    ``ImplicitAssertion`` is not a list of the required number of bytes:
|        ``type_error(list(byte,32),ImplicitAssertion)``
|    ``ImplicitAssertion`` contains a non-integer byte:
|        ``type_error(integer,Byte)``
|    ``ImplicitAssertion`` contains an integer outside the byte range:
|        ``domain_error(byte,Byte)``


------------

Private predicates
------------------

(no local declarations; see entity ancestors if any)

Operators
---------

(none)