Encryption Algorithms

This framework comes with several encryption algorithms. These algorithms are in the following namespaces:

• Jose\Component\Encryption\Algorithm\KeyEncryption: key encryption algorithms

• Jose\Component\Encryption\Algorithm\ContentEncryption: content encryption algorithms

Key Encryption

• Package web-token/jwt-encryption-algorithm-aeskw

  • A128KW

  • A192KW

  • A256KW

• Package web-token/jwt-encryption-algorithm-aesgcmkw

  • A128GCMKW

  • A192GCMKW

  • A256GCMKW

• Package web-token/jwt-encryption-algorithm-dir

  • dir (class Dir)

• Package web-token/jwt-encryption-algorithm-ecdh-es

  • ECDH-ES (class ECDHES) READ THE NOTE BELOW

  • ECDH-ES+A128KW (class ECDHESA128KW) READ THE NOTE BELOW

  • ECDH-ES+A192KW (class ECDHESA192KW) READ THE NOTE BELOW

  • ECDH-ES+A256KW (class ECDHESA256KW) READ THE NOTE BELOW

• Package web-token/jwt-encryption-algorithm-pbes2

  • PBES2-HS256+A128KW (class PBES2HS256A128KW)

  • PBES2-HS384+A192KW (class PBES2HS384A192KW)

  • PBES2-HS512+A256KW (class PBES2HS512A256KW)

• Package web-token/jwt-encryption-algorithm-rsa

  • RSA1_5 (class RSA15) READ THE NOTE BELOW

  • RSA-OAEP (class RSAOAEP)

  • RSA-OAEP-256 (class RSAOAEP256)

Content Encryption

• Package web-token/jwt-encryption-algorithm-aesgcm

  • A128GCM

  • A192GCM

  • A256GCM

• Package web-token/jwt-encryption-algorithm-aescbc

  • A128CBC-HS256 (class A128CBCHS256)

  • A192CBC-HS384 (class A192CBCHS384)

  • A256CBC-HS512 (class A256CBCHS512)

The algorithm RSA1_5 is deprecated due to known security vulnerability.

The algorithms ECDH-ES* are not recommended unless used with the OKP key type.

Experimental Algorithms

The following algorithms are experimental and must not be used in production unless you know what you are doing. They are proposed for testing purpose only.

They are all part of the package web-token/jwt-encryption-algorithm-experimental

Key Encryption

• A128CTR, A192CTR and A256CTR: AES CTR based encryption.

• Chacha20+Poly1305 : Please note that this algorithm requires OpenSSL 1.1

• RSA-OAEP-384 and RSA-OAEP-512: Same algorithm as RSA-OAEP-256 but with SHA-384 and SHA-512 hashing functions.

Content Encryption

• AxxxCCM-16-128, AxxxCCM-16-64, AxxxCCM-64-128, AxxxCCM-64-64: AES-CCM based aalgorithms. xxx can be 128 or 256.

How To Use

These algorithms have to be used with the Algorithm Manager.

<?php

use Jose\Component\Core\AlgorithmManager;
use Jose\Component\Encryption\Algorithm\KeyEncryption\A128KW;
use Jose\Component\Encryption\Algorithm\KeyEncryption\PBES2HS256A128KW;
use Jose\Component\Encryption\Algorithm\ContentEncryption\A128CBCHS256;

$algorithmManager = new AlgorithmManager([
    new A128KW(),
    new PBES2HS256A128KW(),
    new A128CBCHS256(),
]);

By default, PBES2* algorithms use the following parameter values:

• Salt size: 64 bytes (512 bits)

• Count: 4096

You may need to use other values. This can be done during the instantiation of the algorithm:

Example with 16 bytes (128 bits) salt and 1024 counts:

<?php

use Jose\Component\Core\AlgorithmManager;
use Jose\Component\Encryption\Algorithm\KeyEncryption\PBES2HS256A128KW;

$algorithmManager = new AlgorithmManager([
    new PBES2HS256A128KW(16, 1024),
]);