.. index:: single: jwt_der .. _jwt_der/0:

.. rst-class:: right

object

jwt_der

DER and PEM helpers for JWK public keys and JOSE signatures.

| Availability: | logtalk_load(jwt(loader))

| Author: Paulo Moura | Version: 1:0:0 | Date: 2026-07-06

| Compilation flags: | static, context_switching_calls

| Imports: | public :ref:`jwt_helpers <jwt_helpers/0>` | Uses: | :ref:`base64 <base64/0>` | :ref:`list <list/0>` | :ref:`user <user/0>`

| Remarks: | (none)

| Inherited public predicates: |  :ref:`options_protocol/0::check_option/1`  :ref:`options_protocol/0::check_options/1`  :ref:`options_protocol/0::default_option/1`  :ref:`options_protocol/0::default_options/1`  :ref:`options_protocol/0::option/2`  :ref:`options_protocol/0::option/3`  :ref:`options_protocol/0::valid_option/1`  :ref:`options_protocol/0::valid_options/1`  

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

Public predicates

.. index:: public_key_pem/2 .. _jwt_der/0::public_key_pem/2:

public_key_pem/2 ^^^^^^^^^^^^^^^^^^^^

Converts a supported JWK public key into PEM SubjectPublicKeyInfo text.

| Compilation flags: | static

| Template: | public_key_pem(Key,PEM) | Mode and number of proofs: | public_key_pem(+term,-atom) - one_or_error

| Exceptions: | Key is not a supported RSA or P-256 EC public JWK: | domain_error(jwt_jwk_public_key,Key) | Key contains Base64URL data with characters outside the Base64URL alphabet: | representation_error(base64)

---

.. index:: es256_signature_der/2 .. _jwt_der/0::es256_signature_der/2:

es256_signature_der/2 ^^^^^^^^^^^^^^^^^^^^^^^^^

Converts a raw JOSE ES256 signature into DER-encoded ASN.1 form.

| Compilation flags: | static

| Template: | es256_signature_der(Signature,DER) | Mode and number of proofs: | es256_signature_der(+list(byte),-list(byte)) - one_or_error

| Exceptions: | Signature is not a 64-byte raw ES256 signature: | domain_error(jwt_es256_signature,Signature)

---

Protected predicates

(no local declarations; see entity ancestors if any)

Private predicates

(no local declarations; see entity ancestors if any)

Operators

(none)