JWT Framework
v3.0
v3.0
  • Introduction
  • Introduction
    • Provided Features
    • Pre-requisite
    • Continous Integration
    • Contributing
  • The Components
    • Algorithm Management (JWA)
    • Key (JWK) and Key Set (JWKSet)
      • Key (JWK)
      • Key Set (JWKSet)
    • Header Checker
    • Claim Checker
    • Signed Tokens (JWS)
      • Signature Algorithms
      • JWS Creation
      • JWS Loading
    • Encrypted Tokens (JWE)
      • Encryption Algorithms
      • JWE Creation
      • JWE Loading
  • The Symfony Bundle
    • Symfony Bundle
    • Algorithm Management
    • Key and Key Set Management
      • Key Management (JWK)
      • Key Set Management (JWKSet)
    • Header and Claim Checker Management
    • Signed Tokens
      • JWS serializers
      • JWS creation
      • JWS verification
    • Encrypted Tokens
      • JWE serializers
      • JWE creation
      • JWE decryption
    • Configuration Helper
    • Events
  • Console Command
    • Console
    • Standalone Application
    • PHAR Application
    • Symfony Console
  • Advanced Topics
    • Security Recommendations
    • Nested Tokens
    • Serialization
    • Custom Algorithm
    • Signed tokens and
      • Unprotected Header
      • Multiple Signatures
      • Detached Payload
      • Unencoded Payload
    • Encrypted tokens and
      • Unprotected Headers
      • Multiple Recipients
      • Additional Authentication Data (AAD)
  • Benchmark
    • How To
    • Result table
  • Migration
    • From v1.x to v2.0
    • From v2.x to v3.0
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  1. The Components

Algorithm Management (JWA)

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Last updated 3 years ago

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For each cryptographic operation, you will need at least one algorithm and one key.

The algorithm list depends on the cypher operation to be performed (signature or encryption).

These algorithms are managed by an Algorithm Manager. In the following example, we will create an algorithm manager that will handle two algorithms: PS256 and ES512.

The algorithm management is part of the web-token/jwt-core component. The signature algorithms are available in dedicated packages. See or algorithm pages for more information.

composer require web-token/jwt-core
<?php

use Jose\Component\Core\AlgorithmManager;
use Jose\Component\Signature\Algorithm\PS256;
use Jose\Component\Signature\Algorithm\ES512;

$algorithmManager = new AlgorithmManager([
    new PS256(),
    new ES512(),
]);

It is not possible to set the same algorithm twice in the same algorithm manager.

Algorithm Manager Factory

Your application may need several algorithm managers for several use cases. For example you application may use JWT for:

  • signed events,

  • authentication tokens.

To avoid mixing algorithms in one algorithm manager or instantiate several times the same algorithms, this framework provides an Algorithm Manager Factory.

This factory will create algorithm managers on demand. It allows the same algorithm to be instantiated multiple times but with different configuration options.

Each algorithm is identified using an alias.

<?php

use Jose\Component\Core\AlgorithmManagerFactory;
use Jose\Component\Signature\Algorithm\PS256;
use Jose\Component\Encryption\Algorithm\KeyEncryption\PBES2HS512A256KW;
use Jose\Component\Encryption\Algorithm\ContentEncryption\A128CBCHS256;

$algorithmManagerFactory = new AlgorithmManagerFactory();
$algorithmManagerFactory 
    ->add('PS256', new PS256())
    ->add('A128CBC-HS256', new A128CBCHS256())
    ->add('PBES2-HS512+A256KW', new PBES2HS512A256KW())
    ->add('PBES2-HS512+A256KW with custom configuration', new PBES2HS512A256KW(128, 8192))
;

The first argument of the method add is the alias for the algorithm. It must be unique. In general, this alias corresponds to the algorithm name.

As you can see in the example, we added the algorithm PBES2-HS512+A256KW twice:

  • with the default configuration,

  • with custom arguments.

Now our algorithm manager factory is ready. We can create several algorithm managers by passing a list of aliases to the method create:

<?php

$signatureAlgorithmManager = $algorithmManagerFactory ->create(['PS256']);
$encryptionAlgorithmManager = $algorithmManagerFactory ->create(['A128CBC-HS256', 'PBES2-HS512+A256KW']);
$encryptionAlgorithmManagerForParanoid = $algorithmManagerFactory ->create(['A128CBC-HS256', 'PBES2-HS512+A256KW with custom configuration']);

signature
encryption