Encrypter::getEncryptedKeyFroKeyAgreementAlgorithm() - Code Metrics - Inspection of "Code optimization" - Spomky-Labs/jose - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — v2.0.x ( 149802...dc4bfa )

by Florent

created 2016-01-28 23:28 UTC

getEncryptedKeyFroKeyAgreementAlgorithm() A

↳ Parent: Encrypter

Complexity

Conditions	2
Paths	2

Size

Total Lines	9
Code Lines	5

Duplication

Lines	0
Ratio	0 %

Importance

Changes	1
Bugs	0	Features	0

Metric	Value
c	1
b	0
f	0
dl	0
loc	9
rs	9.6666
cc	2
eloc	5
nc	2
nop	6

<?php

/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2014-2016 Spomky-Labs
 *
 * This software may be modified and distributed under the terms
 * of the MIT license.  See the LICENSE file for details.
 */

namespace Jose;

use Base64Url\Base64Url;
use Jose\Algorithm\ContentEncryptionAlgorithmInterface;
use Jose\Algorithm\JWAManagerInterface;
use Jose\Algorithm\KeyEncryption\DirectEncryptionInterface;
use Jose\Algorithm\KeyEncryption\KeyAgreementInterface;
use Jose\Algorithm\KeyEncryption\KeyAgreementWrappingInterface;
use Jose\Algorithm\KeyEncryption\KeyEncryptionInterface;
use Jose\Algorithm\KeyEncryption\KeyWrappingInterface;
use Jose\Algorithm\KeyEncryptionAlgorithmInterface;
use Jose\Behaviour\HasCompressionManager;
use Jose\Behaviour\HasJWAManager;
use Jose\Behaviour\HasKeyChecker;
use Jose\Compression\CompressionManagerInterface;
use Jose\Object\JWEInterface;
use Jose\Object\JWKInterface;
use Jose\Object\Recipient;

/**
 */
final class Encrypter implements EncrypterInterface
{
    use HasKeyChecker;
    use HasJWAManager;
    use HasCompressionManager;

    /**
     * Encrypter constructor.
     *
     * @param \Jose\Algorithm\JWAManagerInterface           $jwa_manager
     * @param \Jose\Compression\CompressionManagerInterface $compression_manager
     */
    public function __construct(
        JWAManagerInterface $jwa_manager,
        CompressionManagerInterface $compression_manager)
    {
        $this->setJWAManager($jwa_manager);
        $this->setCompressionManager($compression_manager);
    }

    /**
     * @param \Jose\Object\JWEInterface      $jwe
     * @param \Jose\Object\JWKInterface      $recipient_key
     * @param \Jose\Object\JWKInterface|null $sender_key
     * @param array                          $recipient_headers
     *
     * @return \Jose\Object\JWEInterface
     */
    public function addRecipient(JWEInterface $jwe, JWKInterface $recipient_key, JWKInterface $sender_key = null, array $recipient_headers = [])
    {
        $complete_headers = array_merge(
            $jwe->getSharedProtectedHeaders(),
            $jwe->getSharedHeaders(),
            $recipient_headers
        );

        // Key Encryption Algorithm
        $key_encryption_algorithm = $this->findKeyEncryptionAlgorithm($complete_headers);

        // Content Encryption Algorithm
        $content_encryption_algorithm = $this->findContentEncryptionAlgorithm($complete_headers);

        // We check keys (usage and algorithm if restrictions are set)
        $this->checkKeys($key_encryption_algorithm, $recipient_key, $sender_key);

        if (null === $jwe->getCiphertext()) {
            // the content is not yet encrypted (no recipient)

            if (!empty($jwe->getSharedProtectedHeaders())) {
                $jwe = $jwe->withEncodedSharedProtectedHeaders(Base64Url::encode(json_encode($jwe->getSharedProtectedHeaders())));
            }

            // CEK
            $content_encryption_key = $this->getCEK(
                $complete_headers,
                $key_encryption_algorithm,
                $content_encryption_algorithm,
                $recipient_key,
                $sender_key
            );
            $jwe = $jwe->withContentEncryptionKey($content_encryption_key);

            // IV
            if (null !== $iv_size = $content_encryption_algorithm->getIVSize()) {
                $iv = $this->createIV($iv_size);
                $jwe = $jwe->withIV($iv);
            }

            // We encrypt the payload and get the tag
            $tag = null;
            $payload = $this->preparePayload($jwe->getPayload(), $complete_headers);

            $ciphertext = $content_encryption_algorithm->encryptContent(
                $payload,
                $content_encryption_key,
                $jwe->getIV(),
                $jwe->getAAD(),
                $jwe->getEncodedSharedProtectedHeaders(),
                $tag
            );
            $jwe = $jwe->withCiphertext($ciphertext);

            // Tag
            if (null !== $tag) {
                $jwe = $jwe->withTag($tag);
            }

            $recipient = $this->computeRecipient(
                $jwe,
                $key_encryption_algorithm,
                $content_encryption_algorithm,
                $complete_headers,
                $recipient_headers,
                $recipient_key,
                $sender_key
            );

            $jwe = $jwe->addRecipient($recipient);
        } else {
            if (0 === $jwe->countRecipients()) {
                throw new \InvalidArgumentException('Invalid JWE. The payload is encrypted but no recipient is available.');
            }
            if (null === $jwe->getContentEncryptionKey()) {
                throw new \InvalidArgumentException('Unable to add a recipient. The JWE must be decrypted first.');
            }
            $current_key_management_mode = $this->getCurrentKeyManagementMode($jwe);

            if (false === $this->areKeyManagementModesCompatible($current_key_management_mode, $key_encryption_algorithm->getKeyManagementMode())) {
                throw new \InvalidArgumentException('Foreign key management mode forbidden.');
            }

            $recipient = $this->computeRecipient(
                $jwe,
                $key_encryption_algorithm,
                $content_encryption_algorithm,
                $complete_headers,
                $recipient_headers,
                $recipient_key,
                $sender_key
            );

            $jwe = $jwe->addRecipient($recipient);
        }

        return $jwe;
    }

    /**
     * @param \Jose\Algorithm\KeyEncryptionAlgorithmInterface $algorithm
     * @param \Jose\Object\JWKInterface                       $recipient_key
     * @param \Jose\Object\JWKInterface|null                  $sender_key
     */
    private function checkKeys(KeyEncryptionAlgorithmInterface $algorithm, JWKInterface $recipient_key, JWKInterface $sender_key = null)
    {
        $this->checkKeyUsage($recipient_key, 'encryption');
        $this->checkKeyAlgorithm($recipient_key, $algorithm->getAlgorithmName());
        if ($sender_key instanceof JWKInterface) {
            $this->checkKeyUsage($sender_key, 'encryption');
            $this->checkKeyAlgorithm($sender_key, $algorithm->getAlgorithmName());
        }
    }

    /**
     * @param \Jose\Object\JWEInterface $jwe
     *
     * @return string
     */
    private function getCurrentKeyManagementMode(JWEInterface $jwe)
    {
        $complete_headers = array_merge(
            $jwe->getSharedProtectedHeaders(),
            $jwe->getSharedHeaders(),
            $jwe->getRecipient(0)->getHeaders()
        );
        $key_encryption_algorithm = $this->findKeyEncryptionAlgorithm($complete_headers);

        return $key_encryption_algorithm->getKeyManagementMode();
    }

    /**
     * @param \Jose\Object\JWEInterface                           $jwe
     * @param \Jose\Algorithm\KeyEncryptionAlgorithmInterface     $key_encryption_algorithm
     * @param \Jose\Algorithm\ContentEncryptionAlgorithmInterface $content_encryption_algorithm
     * @param array                                               $complete_headers
     * @param array                                               $recipient_headers
     * @param \Jose\Object\JWKInterface                           $recipient_key
     * @param \Jose\Object\JWKInterface|null                      $sender_key
     *
     * @return \Jose\Object\RecipientInterface
     */
    private function computeRecipient(JWEInterface $jwe, KeyEncryptionAlgorithmInterface $key_encryption_algorithm, ContentEncryptionAlgorithmInterface $content_encryption_algorithm, array $complete_headers, array $recipient_headers, JWKInterface $recipient_key, JWKInterface $sender_key = null)
    {
        $recipient = new Recipient();
        $recipient = $recipient->withHeaders($recipient_headers);

        $additional_headers = [];
        $encrypted_content_encryption_key = $this->getEncryptedKey(
            $complete_headers,
            $jwe->getContentEncryptionKey(),
            $key_encryption_algorithm,
            $content_encryption_algorithm,
            $additional_headers,
            $recipient_key,
            $sender_key
        );
        if (!empty($additional_headers)) {
            foreach ($additional_headers as $key => $value) {
                $recipient = $recipient->withHeader($key, $value);
            }
        }
        if (null !== $encrypted_content_encryption_key) {
            $recipient = $recipient->withEncryptedKey($encrypted_content_encryption_key);
        }

        return $recipient;
    }

    /**
     * @param string $current
     * @param string $new
     *
     * @return bool
     */
    private function areKeyManagementModesCompatible($current, $new)
    {
        $agree = KeyEncryptionAlgorithmInterface::MODE_AGREEMENT;
        $dir = KeyEncryptionAlgorithmInterface::MODE_DIRECT;
        $enc = KeyEncryptionAlgorithmInterface::MODE_ENCRYPT;
        $wrap = KeyEncryptionAlgorithmInterface::MODE_WRAP;

        $supported_key_management_mode_combinations = [
            $agree.$enc => true,
            $agree.$wrap => true,
            $dir.$enc => true,
            $dir.$wrap => true,
            $enc.$enc => true,
            $enc.$wrap => true,
            $wrap.$enc => true,
            $wrap.$wrap => true,
            $agree.$agree => false,
            $agree.$dir => false,
            $dir.$agree => false,
            $dir.$dir => false,
            $enc.$agree => false,
            $enc.$dir => false,
            $wrap.$agree => false,
            $wrap.$dir => false,
        ];

        if (array_key_exists($current.$new, $supported_key_management_mode_combinations)) {
            return $supported_key_management_mode_combinations[$current.$new];
        }

        return false;
    }

    /**
     * @param string $payload
     * @param array  $complete_headers
     *
     * @return string
     */
    private function preparePayload($payload, array $complete_headers)
    {
        $prepared = is_string($payload) ? $payload : json_encode($payload);

        if (null === $prepared) {
            throw new \InvalidArgumentException('The payload is empty or cannot encoded into JSON.');
        }
        if (!array_key_exists('zip', $complete_headers)) {
            return $prepared;
        }

        $compression_method = $this->getCompressionManager()->getCompressionAlgorithm($complete_headers['zip']);
        if (null === $compression_method) {
            throw new \RuntimeException(sprintf('Compression method "%s" not supported', $complete_headers['zip']));
        }
        $compressed_payload = $compression_method->compress($prepared);
        if (!is_string($compressed_payload)) {
            throw new \RuntimeException('Compression failed.');
        }

        return $compressed_payload;
    }

    /**
     * @param array                                               $complete_headers
     * @param string                                              $cek
     * @param \Jose\Algorithm\KeyEncryptionAlgorithmInterface     $key_encryption_algorithm
     * @param \Jose\Algorithm\ContentEncryptionAlgorithmInterface $content_encryption_algorithm
     * @param \Jose\Object\JWKInterface                           $recipient_key
     * @param \Jose\Object\JWKInterface|null                      $sender_key
     * @param array                                               $additional_headers
     *
     * @return string|null
     */
    private function getEncryptedKey(array $complete_headers, $cek, KeyEncryptionAlgorithmInterface $key_encryption_algorithm, ContentEncryptionAlgorithmInterface $content_encryption_algorithm, array &$additional_headers, JWKInterface $recipient_key, JWKInterface $sender_key = null)
    {
        if ($key_encryption_algorithm instanceof KeyEncryptionInterface) {

            return $this->getEncryptedKeyFroKeyEncryptionAlgorithm($complete_headers, $cek, $key_encryption_algorithm, $recipient_key);
        } elseif ($key_encryption_algorithm instanceof KeyWrappingInterface) {

            return $this->getEncryptedKeyFroKeyWrappingAlgorithm($complete_headers, $cek, $key_encryption_algorithm, $recipient_key);
        } elseif ($key_encryption_algorithm instanceof KeyAgreementWrappingInterface) {

            return $this->getEncryptedKeyFroKeyAgreementAndKeyWrappingAlgorithm($complete_headers, $cek, $key_encryption_algorithm, $content_encryption_algorithm, $additional_headers, $recipient_key, $sender_key);
        } elseif ($key_encryption_algorithm instanceof KeyAgreementInterface) {

            return $this->getEncryptedKeyFroKeyAgreementAlgorithm($complete_headers, $key_encryption_algorithm, $content_encryption_algorithm, $additional_headers, $recipient_key, $sender_key);
        }
    }

    /**
     * @param array                                               $complete_headers
     * @param \Jose\Algorithm\KeyEncryption\KeyAgreementInterface $key_encryption_algorithm
     * @param \Jose\Algorithm\ContentEncryptionAlgorithmInterface $content_encryption_algorithm
     * @param array                                               $additional_headers
     * @param \Jose\Object\JWKInterface                           $recipient_key
     * @param \Jose\Object\JWKInterface|null                      $sender_key
     *
     * @return mixed
     */
    private function getEncryptedKeyFroKeyAgreementAlgorithm(array $complete_headers, KeyAgreementInterface $key_encryption_algorithm, ContentEncryptionAlgorithmInterface $content_encryption_algorithm, array &$additional_headers, JWKInterface $recipient_key, JWKInterface $sender_key = null)
    {
        if (!$sender_key instanceof JWKInterface) {
            throw new \RuntimeException('The sender key must be set using Key Agreement or Key Agreement with Wrapping algorithms.');
        }
        $jwt_cek = $key_encryption_algorithm->getAgreementKey($content_encryption_algorithm->getCEKSize(), $sender_key, $recipient_key, $complete_headers, $additional_headers);

        return $jwt_cek;
    }

    /**
     * @param array                                                       $complete_headers
     * @param string                                                      $cek
     * @param \Jose\Algorithm\KeyEncryption\KeyAgreementWrappingInterface $key_encryption_algorithm
     * @param \Jose\Algorithm\ContentEncryptionAlgorithmInterface         $content_encryption_algorithm
     * @param array                                                       $additional_headers
     * @param \Jose\Object\JWKInterface                                   $recipient_key
     * @param \Jose\Object\JWKInterface|null                              $sender_key
     *
     * @return string
     */
    private function getEncryptedKeyFroKeyAgreementAndKeyWrappingAlgorithm(array $complete_headers, $cek, KeyAgreementWrappingInterface $key_encryption_algorithm, ContentEncryptionAlgorithmInterface $content_encryption_algorithm, array &$additional_headers, JWKInterface $recipient_key, JWKInterface $sender_key = null)
    {
        if (!$sender_key instanceof JWKInterface) {
            throw new \RuntimeException('The sender key must be set using Key Agreement or Key Agreement with Wrapping algorithms.');
        }
        $jwt_cek = $key_encryption_algorithm->wrapAgreementKey($sender_key, $recipient_key, $cek, $content_encryption_algorithm->getCEKSize(), $complete_headers, $additional_headers);

        return $jwt_cek;
    }

    /**
     * @param array                                                $complete_headers
     * @param string                                               $cek
     * @param \Jose\Algorithm\KeyEncryption\KeyEncryptionInterface $key_encryption_algorithm
     * @param \Jose\Object\JWKInterface                            $recipient_key
     *
     * @return string
     */
    private function getEncryptedKeyFroKeyEncryptionAlgorithm(array $complete_headers, $cek, KeyEncryptionInterface $key_encryption_algorithm, JWKInterface $recipient_key)
    {
        return $key_encryption_algorithm->encryptKey(
            $recipient_key,
            $cek,
            $complete_headers
        );
    }

    /**
     * @param array                                              $complete_headers
     * @param string                                             $cek
     * @param \Jose\Algorithm\KeyEncryption\KeyWrappingInterface $key_encryption_algorithm
     * @param \Jose\Object\JWKInterface                          $recipient_key
     *
     * @return string
     */
    private function getEncryptedKeyFroKeyWrappingAlgorithm(array $complete_headers, $cek, KeyWrappingInterface $key_encryption_algorithm, JWKInterface $recipient_key)
    {
        return $key_encryption_algorithm->wrapKey(
            $recipient_key,
            $cek,
            $complete_headers
        );
    }

    /**
     * @param array                                               $complete_headers
     * @param \Jose\Algorithm\KeyEncryptionAlgorithmInterface     $key_encryption_algorithm
     * @param \Jose\Algorithm\ContentEncryptionAlgorithmInterface $content_encryption_algorithm
     * @param \Jose\Object\JWKInterface                           $recipient_key
     * @param \Jose\Object\JWKInterface|null                      $sender_key
     *
     * @return string
     */
    private function getCEK(array $complete_headers, KeyEncryptionAlgorithmInterface $key_encryption_algorithm, ContentEncryptionAlgorithmInterface $content_encryption_algorithm, JWKInterface $recipient_key, JWKInterface $sender_key = null)
    {
        if ($key_encryption_algorithm instanceof KeyEncryptionInterface) {
            return $this->createCEK($content_encryption_algorithm->getCEKSize());
        } elseif ($key_encryption_algorithm instanceof KeyAgreementWrappingInterface) {
            return $this->createCEK($content_encryption_algorithm->getCEKSize());
        } elseif ($key_encryption_algorithm instanceof KeyAgreementInterface) {
            return $this->calculateAgreementKey($complete_headers, $key_encryption_algorithm, $content_encryption_algorithm, $recipient_key, $sender_key);
        } elseif ($key_encryption_algorithm instanceof DirectEncryptionInterface) {
            return $key_encryption_algorithm->getCEK($recipient_key);
        } else {
            throw new \RuntimeException('Unable to get key management mode.');
        }
    }

    /**
     * @param array $complete_headers
     *
     * @return \Jose\Algorithm\KeyEncryptionAlgorithmInterface
     */
    private function findKeyEncryptionAlgorithm(array $complete_headers)
    {
        if (!array_key_exists('alg', $complete_headers)) {
            throw new \InvalidArgumentException('Parameter "alg" is missing.');
        }
        $key_encryption_algorithm = $this->getJWAManager()->getAlgorithm($complete_headers['alg']);
        if ($key_encryption_algorithm instanceof KeyEncryptionAlgorithmInterface) {
            return $key_encryption_algorithm;
        }
        throw new \InvalidArgumentException(sprintf('The key encryption algorithm "%s" is not supported or not a key encryption algorithm instance.', $complete_headers['alg']));
    }

    /**
     * @param array $complete_headers
     *
     * @return \Jose\Algorithm\ContentEncryptionAlgorithmInterface
     */
    private function findContentEncryptionAlgorithm(array $complete_headers)
    {
        if (!array_key_exists('enc', $complete_headers)) {
            throw new \InvalidArgumentException('Parameter "enc" is missing.');
        }

        $content_encryption_algorithm = $this->getJWAManager()->getAlgorithm($complete_headers['enc']);
        if (!$content_encryption_algorithm instanceof ContentEncryptionAlgorithmInterface) {
            throw new \RuntimeException(sprintf('The algorithm "%s" is not enabled or does not implement ContentEncryptionInterface.', $complete_headers['enc']));
        }

        return $content_encryption_algorithm;
    }

    /**
     * @param array                                               $complete_headers
     * @param \Jose\Algorithm\KeyEncryption\KeyAgreementInterface $key_encryption_algorithm
     * @param \Jose\Algorithm\ContentEncryptionAlgorithmInterface $content_encryption_algorithm
     * @param \Jose\Object\JWKInterface                           $recipient_key
     * @param \Jose\Object\JWKInterface|null                      $sender_key
     *
     * @return string
     */
    private function calculateAgreementKey(array $complete_headers, KeyAgreementInterface $key_encryption_algorithm, ContentEncryptionAlgorithmInterface $content_encryption_algorithm, JWKInterface $recipient_key, JWKInterface $sender_key = null)
    {
        if (!$sender_key instanceof JWKInterface) {
            throw new \RuntimeException('The sender key must be set using Key Agreement or Key Agreement with Wrapping algorithms.');
        }
        $additional_header_values = [];
        $cek = $key_encryption_algorithm->getAgreementKey($content_encryption_algorithm->getCEKSize(), $sender_key, $recipient_key, $complete_headers, $additional_header_values);

        return $cek;
    }

    /**
     * @param int $size
     *
     * @return string
     */
    private function createCEK($size)
    {
        return $this->generateRandomString($size / 8);
    }

    /**
     * @param int $size
     *
     * @return string
     */
    private function createIV($size)
    {
        return $this->generateRandomString($size / 8);
    }

    /**
     * @param int $length
     *
     * @return string
     */
    private function generateRandomString($length)
    {
        if (function_exists('random_bytes')) {
            return random_bytes($length);
        } else {
            return openssl_random_pseudo_bytes($length);
        }
    }
}


1			<?php
2
3			/*
4			* The MIT License (MIT)
5			*
6			* Copyright (c) 2014-2016 Spomky-Labs
7			*
8			* This software may be modified and distributed under the terms
9			* of the MIT license. See the LICENSE file for details.
10			*/
11
12			namespace Jose;
13
14			use Base64Url\Base64Url;
15			use Jose\Algorithm\ContentEncryptionAlgorithmInterface;
16			use Jose\Algorithm\JWAManagerInterface;
17			use Jose\Algorithm\KeyEncryption\DirectEncryptionInterface;
18			use Jose\Algorithm\KeyEncryption\KeyAgreementInterface;
19			use Jose\Algorithm\KeyEncryption\KeyAgreementWrappingInterface;
20			use Jose\Algorithm\KeyEncryption\KeyEncryptionInterface;
21			use Jose\Algorithm\KeyEncryption\KeyWrappingInterface;
22			use Jose\Algorithm\KeyEncryptionAlgorithmInterface;
23			use Jose\Behaviour\HasCompressionManager;
24			use Jose\Behaviour\HasJWAManager;
25			use Jose\Behaviour\HasKeyChecker;
26			use Jose\Compression\CompressionManagerInterface;
27			use Jose\Object\JWEInterface;
28			use Jose\Object\JWKInterface;
29			use Jose\Object\Recipient;
30
31			/**
32			*/
33			final class Encrypter implements EncrypterInterface
34			{
35			use HasKeyChecker;
36			use HasJWAManager;
37			use HasCompressionManager;
38
39			/**
40			* Encrypter constructor.
41			*
42			* @param \Jose\Algorithm\JWAManagerInterface $jwa_manager
43			* @param \Jose\Compression\CompressionManagerInterface $compression_manager
44			*/
45			public function __construct(
46			JWAManagerInterface $jwa_manager,
47			CompressionManagerInterface $compression_manager)
48			{
49			$this->setJWAManager($jwa_manager);
50			$this->setCompressionManager($compression_manager);
51			}
52
53			/**
54			* @param \Jose\Object\JWEInterface $jwe
55			* @param \Jose\Object\JWKInterface $recipient_key
56			* @param \Jose\Object\JWKInterface\|null $sender_key
57			* @param array $recipient_headers
58			*
59			* @return \Jose\Object\JWEInterface
60			*/
61			public function addRecipient(JWEInterface $jwe, JWKInterface $recipient_key, JWKInterface $sender_key = null, array $recipient_headers = [])
62			{
63			$complete_headers = array_merge(
64			$jwe->getSharedProtectedHeaders(),
65			$jwe->getSharedHeaders(),
66			$recipient_headers
67			);
68
69			// Key Encryption Algorithm
70			$key_encryption_algorithm = $this->findKeyEncryptionAlgorithm($complete_headers);
71
72			// Content Encryption Algorithm
73			$content_encryption_algorithm = $this->findContentEncryptionAlgorithm($complete_headers);
74
75			// We check keys (usage and algorithm if restrictions are set)
76			$this->checkKeys($key_encryption_algorithm, $recipient_key, $sender_key);
77
78			if (null === $jwe->getCiphertext()) {
79			// the content is not yet encrypted (no recipient)
80
81			if (!empty($jwe->getSharedProtectedHeaders())) {
82			$jwe = $jwe->withEncodedSharedProtectedHeaders(Base64Url::encode(json_encode($jwe->getSharedProtectedHeaders())));
83			}
84
85			// CEK
86			$content_encryption_key = $this->getCEK(
87			$complete_headers,
88			$key_encryption_algorithm,
89			$content_encryption_algorithm,
90			$recipient_key,
91			$sender_key
92			);
93			$jwe = $jwe->withContentEncryptionKey($content_encryption_key);
94
95			// IV
96			if (null !== $iv_size = $content_encryption_algorithm->getIVSize()) {
97			$iv = $this->createIV($iv_size);
98			$jwe = $jwe->withIV($iv);
99			}
100
101			// We encrypt the payload and get the tag
102			$tag = null;
103			$payload = $this->preparePayload($jwe->getPayload(), $complete_headers);
104
105			$ciphertext = $content_encryption_algorithm->encryptContent(
106			$payload,
107			$content_encryption_key,
108			$jwe->getIV(),
109			$jwe->getAAD(),
110			$jwe->getEncodedSharedProtectedHeaders(),
111			$tag
112			);
113			$jwe = $jwe->withCiphertext($ciphertext);
114
115			// Tag
116			if (null !== $tag) {
117			$jwe = $jwe->withTag($tag);
118			}
119
120			$recipient = $this->computeRecipient(
121			$jwe,
122			$key_encryption_algorithm,
123			$content_encryption_algorithm,
124			$complete_headers,
125			$recipient_headers,
126			$recipient_key,
127			$sender_key
128			);
129
130			$jwe = $jwe->addRecipient($recipient);
131			} else {
132			if (0 === $jwe->countRecipients()) {
133			throw new \InvalidArgumentException('Invalid JWE. The payload is encrypted but no recipient is available.');
134			}
135			if (null === $jwe->getContentEncryptionKey()) {
136			throw new \InvalidArgumentException('Unable to add a recipient. The JWE must be decrypted first.');
137			}
138			$current_key_management_mode = $this->getCurrentKeyManagementMode($jwe);
139
140			if (false === $this->areKeyManagementModesCompatible($current_key_management_mode, $key_encryption_algorithm->getKeyManagementMode())) {
141			throw new \InvalidArgumentException('Foreign key management mode forbidden.');
142			}
143
144			$recipient = $this->computeRecipient(
145			$jwe,
146			$key_encryption_algorithm,
147			$content_encryption_algorithm,
148			$complete_headers,
149			$recipient_headers,
150			$recipient_key,
151			$sender_key
152			);
153
154			$jwe = $jwe->addRecipient($recipient);
155			}
156
157			return $jwe;
158			}
159
160			/**
161			* @param \Jose\Algorithm\KeyEncryptionAlgorithmInterface $algorithm
162			* @param \Jose\Object\JWKInterface $recipient_key
163			* @param \Jose\Object\JWKInterface\|null $sender_key
164			*/
165			private function checkKeys(KeyEncryptionAlgorithmInterface $algorithm, JWKInterface $recipient_key, JWKInterface $sender_key = null)
166			{
167			$this->checkKeyUsage($recipient_key, 'encryption');
168			$this->checkKeyAlgorithm($recipient_key, $algorithm->getAlgorithmName());
169			if ($sender_key instanceof JWKInterface) {
170			$this->checkKeyUsage($sender_key, 'encryption');
171			$this->checkKeyAlgorithm($sender_key, $algorithm->getAlgorithmName());
172			}
173			}
174
175			/**
176			* @param \Jose\Object\JWEInterface $jwe
177			*
178			* @return string
179			*/
180			private function getCurrentKeyManagementMode(JWEInterface $jwe)
181			{
182			$complete_headers = array_merge(
183			$jwe->getSharedProtectedHeaders(),
184			$jwe->getSharedHeaders(),
185			$jwe->getRecipient(0)->getHeaders()
186			);
187			$key_encryption_algorithm = $this->findKeyEncryptionAlgorithm($complete_headers);
188
189			return $key_encryption_algorithm->getKeyManagementMode();
190			}
191
192			/**
193			* @param \Jose\Object\JWEInterface $jwe
194			* @param \Jose\Algorithm\KeyEncryptionAlgorithmInterface $key_encryption_algorithm
195			* @param \Jose\Algorithm\ContentEncryptionAlgorithmInterface $content_encryption_algorithm
196			* @param array $complete_headers
197			* @param array $recipient_headers
198			* @param \Jose\Object\JWKInterface $recipient_key
199			* @param \Jose\Object\JWKInterface\|null $sender_key
200			*
201			* @return \Jose\Object\RecipientInterface
202			*/
203			private function computeRecipient(JWEInterface $jwe, KeyEncryptionAlgorithmInterface $key_encryption_algorithm, ContentEncryptionAlgorithmInterface $content_encryption_algorithm, array $complete_headers, array $recipient_headers, JWKInterface $recipient_key, JWKInterface $sender_key = null)
204			{
205			$recipient = new Recipient();
206			$recipient = $recipient->withHeaders($recipient_headers);
207
208			$additional_headers = [];
209			$encrypted_content_encryption_key = $this->getEncryptedKey(
210			$complete_headers,
211			$jwe->getContentEncryptionKey(),
212			$key_encryption_algorithm,
213			$content_encryption_algorithm,
214			$additional_headers,
215			$recipient_key,
216			$sender_key
217			);
218			if (!empty($additional_headers)) {
219			foreach ($additional_headers as $key => $value) {
220			$recipient = $recipient->withHeader($key, $value);
221			}
222			}
223			if (null !== $encrypted_content_encryption_key) {
224			$recipient = $recipient->withEncryptedKey($encrypted_content_encryption_key);
225			}
226
227			return $recipient;
228			}
229
230			/**
231			* @param string $current
232			* @param string $new
233			*
234			* @return bool
235			*/
236			private function areKeyManagementModesCompatible($current, $new)
237			{
238			$agree = KeyEncryptionAlgorithmInterface::MODE_AGREEMENT;
239			$dir = KeyEncryptionAlgorithmInterface::MODE_DIRECT;
240			$enc = KeyEncryptionAlgorithmInterface::MODE_ENCRYPT;
241			$wrap = KeyEncryptionAlgorithmInterface::MODE_WRAP;
242
243			$supported_key_management_mode_combinations = [
244			$agree.$enc => true,
245			$agree.$wrap => true,
246			$dir.$enc => true,
247			$dir.$wrap => true,
248			$enc.$enc => true,
249			$enc.$wrap => true,
250			$wrap.$enc => true,
251			$wrap.$wrap => true,
252			$agree.$agree => false,
253			$agree.$dir => false,
254			$dir.$agree => false,
255			$dir.$dir => false,
256			$enc.$agree => false,
257			$enc.$dir => false,
258			$wrap.$agree => false,
259			$wrap.$dir => false,
260			];
261
262			if (array_key_exists($current.$new, $supported_key_management_mode_combinations)) {
263			return $supported_key_management_mode_combinations[$current.$new];
264			}
265
266			return false;
267			}
268
269			/**
270			* @param string $payload
271			* @param array $complete_headers
272			*
273			* @return string
274			*/
275			private function preparePayload($payload, array $complete_headers)
276			{
277			$prepared = is_string($payload) ? $payload : json_encode($payload);
278
279			if (null === $prepared) {
280			throw new \InvalidArgumentException('The payload is empty or cannot encoded into JSON.');
281			}
282			if (!array_key_exists('zip', $complete_headers)) {
283			return $prepared;
284			}
285
286			$compression_method = $this->getCompressionManager()->getCompressionAlgorithm($complete_headers['zip']);
287			if (null === $compression_method) {
288			throw new \RuntimeException(sprintf('Compression method "%s" not supported', $complete_headers['zip']));
289			}
290			$compressed_payload = $compression_method->compress($prepared);
291			if (!is_string($compressed_payload)) {
292			throw new \RuntimeException('Compression failed.');
293			}
294
295			return $compressed_payload;
296			}
297
298			/**
299			* @param array $complete_headers
300			* @param string $cek
301			* @param \Jose\Algorithm\KeyEncryptionAlgorithmInterface $key_encryption_algorithm
302			* @param \Jose\Algorithm\ContentEncryptionAlgorithmInterface $content_encryption_algorithm
303			* @param \Jose\Object\JWKInterface $recipient_key
304			* @param \Jose\Object\JWKInterface\|null $sender_key
305			* @param array $additional_headers
306			*
307			* @return string\|null
308			*/
309			private function getEncryptedKey(array $complete_headers, $cek, KeyEncryptionAlgorithmInterface $key_encryption_algorithm, ContentEncryptionAlgorithmInterface $content_encryption_algorithm, array &$additional_headers, JWKInterface $recipient_key, JWKInterface $sender_key = null)
310			{
311			if ($key_encryption_algorithm instanceof KeyEncryptionInterface) {
312
313			return $this->getEncryptedKeyFroKeyEncryptionAlgorithm($complete_headers, $cek, $key_encryption_algorithm, $recipient_key);
314			} elseif ($key_encryption_algorithm instanceof KeyWrappingInterface) {
315
316			return $this->getEncryptedKeyFroKeyWrappingAlgorithm($complete_headers, $cek, $key_encryption_algorithm, $recipient_key);
317			} elseif ($key_encryption_algorithm instanceof KeyAgreementWrappingInterface) {
318
319			return $this->getEncryptedKeyFroKeyAgreementAndKeyWrappingAlgorithm($complete_headers, $cek, $key_encryption_algorithm, $content_encryption_algorithm, $additional_headers, $recipient_key, $sender_key);
320			} elseif ($key_encryption_algorithm instanceof KeyAgreementInterface) {
321
322			return $this->getEncryptedKeyFroKeyAgreementAlgorithm($complete_headers, $key_encryption_algorithm, $content_encryption_algorithm, $additional_headers, $recipient_key, $sender_key);
323			}
324			}
325
326			/**
327			* @param array $complete_headers
328			* @param \Jose\Algorithm\KeyEncryption\KeyAgreementInterface $key_encryption_algorithm
329			* @param \Jose\Algorithm\ContentEncryptionAlgorithmInterface $content_encryption_algorithm
330			* @param array $additional_headers
331			* @param \Jose\Object\JWKInterface $recipient_key
332			* @param \Jose\Object\JWKInterface\|null $sender_key
333			*
334			* @return mixed
335			*/
336			private function getEncryptedKeyFroKeyAgreementAlgorithm(array $complete_headers, KeyAgreementInterface $key_encryption_algorithm, ContentEncryptionAlgorithmInterface $content_encryption_algorithm, array &$additional_headers, JWKInterface $recipient_key, JWKInterface $sender_key = null)
337			{
338			if (!$sender_key instanceof JWKInterface) {
339			throw new \RuntimeException('The sender key must be set using Key Agreement or Key Agreement with Wrapping algorithms.');
340			}
341			$jwt_cek = $key_encryption_algorithm->getAgreementKey($content_encryption_algorithm->getCEKSize(), $sender_key, $recipient_key, $complete_headers, $additional_headers);
342
343			return $jwt_cek;
344			}
345
346			/**
347			* @param array $complete_headers
348			* @param string $cek
349			* @param \Jose\Algorithm\KeyEncryption\KeyAgreementWrappingInterface $key_encryption_algorithm
350			* @param \Jose\Algorithm\ContentEncryptionAlgorithmInterface $content_encryption_algorithm
351			* @param array $additional_headers
352			* @param \Jose\Object\JWKInterface $recipient_key
353			* @param \Jose\Object\JWKInterface\|null $sender_key
354			*
355			* @return string
356			*/
357			private function getEncryptedKeyFroKeyAgreementAndKeyWrappingAlgorithm(array $complete_headers, $cek, KeyAgreementWrappingInterface $key_encryption_algorithm, ContentEncryptionAlgorithmInterface $content_encryption_algorithm, array &$additional_headers, JWKInterface $recipient_key, JWKInterface $sender_key = null)
358			{
359			if (!$sender_key instanceof JWKInterface) {
360			throw new \RuntimeException('The sender key must be set using Key Agreement or Key Agreement with Wrapping algorithms.');
361			}
362			$jwt_cek = $key_encryption_algorithm->wrapAgreementKey($sender_key, $recipient_key, $cek, $content_encryption_algorithm->getCEKSize(), $complete_headers, $additional_headers);
363
364			return $jwt_cek;
365			}
366
367			/**
368			* @param array $complete_headers
369			* @param string $cek
370			* @param \Jose\Algorithm\KeyEncryption\KeyEncryptionInterface $key_encryption_algorithm
371			* @param \Jose\Object\JWKInterface $recipient_key
372			*
373			* @return string
374			*/
375			private function getEncryptedKeyFroKeyEncryptionAlgorithm(array $complete_headers, $cek, KeyEncryptionInterface $key_encryption_algorithm, JWKInterface $recipient_key)
376			{
377			return $key_encryption_algorithm->encryptKey(
378			$recipient_key,
379			$cek,
380			$complete_headers
381			);
382			}
383
384			/**
385			* @param array $complete_headers
386			* @param string $cek
387			* @param \Jose\Algorithm\KeyEncryption\KeyWrappingInterface $key_encryption_algorithm
388			* @param \Jose\Object\JWKInterface $recipient_key
389			*
390			* @return string
391			*/
392			private function getEncryptedKeyFroKeyWrappingAlgorithm(array $complete_headers, $cek, KeyWrappingInterface $key_encryption_algorithm, JWKInterface $recipient_key)
393			{
394			return $key_encryption_algorithm->wrapKey(
395			$recipient_key,
396			$cek,
397			$complete_headers
398			);
399			}
400
401			/**
402			* @param array $complete_headers
403			* @param \Jose\Algorithm\KeyEncryptionAlgorithmInterface $key_encryption_algorithm
404			* @param \Jose\Algorithm\ContentEncryptionAlgorithmInterface $content_encryption_algorithm
405			* @param \Jose\Object\JWKInterface $recipient_key
406			* @param \Jose\Object\JWKInterface\|null $sender_key
407			*
408			* @return string
409			*/
410			private function getCEK(array $complete_headers, KeyEncryptionAlgorithmInterface $key_encryption_algorithm, ContentEncryptionAlgorithmInterface $content_encryption_algorithm, JWKInterface $recipient_key, JWKInterface $sender_key = null)
411			{
412			if ($key_encryption_algorithm instanceof KeyEncryptionInterface) {
413			return $this->createCEK($content_encryption_algorithm->getCEKSize());
414			} elseif ($key_encryption_algorithm instanceof KeyAgreementWrappingInterface) {
415			return $this->createCEK($content_encryption_algorithm->getCEKSize());
416			} elseif ($key_encryption_algorithm instanceof KeyAgreementInterface) {
417			return $this->calculateAgreementKey($complete_headers, $key_encryption_algorithm, $content_encryption_algorithm, $recipient_key, $sender_key);
418			} elseif ($key_encryption_algorithm instanceof DirectEncryptionInterface) {
419			return $key_encryption_algorithm->getCEK($recipient_key);
420			} else {
421			throw new \RuntimeException('Unable to get key management mode.');
422			}
423			}
424
425			/**
426			* @param array $complete_headers
427			*
428			* @return \Jose\Algorithm\KeyEncryptionAlgorithmInterface
429			*/
430			private function findKeyEncryptionAlgorithm(array $complete_headers)
431			{
432			if (!array_key_exists('alg', $complete_headers)) {
433			throw new \InvalidArgumentException('Parameter "alg" is missing.');
434			}
435			$key_encryption_algorithm = $this->getJWAManager()->getAlgorithm($complete_headers['alg']);
436			if ($key_encryption_algorithm instanceof KeyEncryptionAlgorithmInterface) {
437			return $key_encryption_algorithm;
438			}
439			throw new \InvalidArgumentException(sprintf('The key encryption algorithm "%s" is not supported or not a key encryption algorithm instance.', $complete_headers['alg']));
440			}
441
442			/**
443			* @param array $complete_headers
444			*
445			* @return \Jose\Algorithm\ContentEncryptionAlgorithmInterface
446			*/
447			private function findContentEncryptionAlgorithm(array $complete_headers)
448			{
449			if (!array_key_exists('enc', $complete_headers)) {
450			throw new \InvalidArgumentException('Parameter "enc" is missing.');
451			}
452
453			$content_encryption_algorithm = $this->getJWAManager()->getAlgorithm($complete_headers['enc']);
454			if (!$content_encryption_algorithm instanceof ContentEncryptionAlgorithmInterface) {
455			throw new \RuntimeException(sprintf('The algorithm "%s" is not enabled or does not implement ContentEncryptionInterface.', $complete_headers['enc']));
456			}
457
458			return $content_encryption_algorithm;
459			}
460
461			/**
462			* @param array $complete_headers
463			* @param \Jose\Algorithm\KeyEncryption\KeyAgreementInterface $key_encryption_algorithm
464			* @param \Jose\Algorithm\ContentEncryptionAlgorithmInterface $content_encryption_algorithm
465			* @param \Jose\Object\JWKInterface $recipient_key
466			* @param \Jose\Object\JWKInterface\|null $sender_key
467			*
468			* @return string
469			*/
470			private function calculateAgreementKey(array $complete_headers, KeyAgreementInterface $key_encryption_algorithm, ContentEncryptionAlgorithmInterface $content_encryption_algorithm, JWKInterface $recipient_key, JWKInterface $sender_key = null)
471			{
472			if (!$sender_key instanceof JWKInterface) {
473			throw new \RuntimeException('The sender key must be set using Key Agreement or Key Agreement with Wrapping algorithms.');
474			}
475			$additional_header_values = [];
476			$cek = $key_encryption_algorithm->getAgreementKey($content_encryption_algorithm->getCEKSize(), $sender_key, $recipient_key, $complete_headers, $additional_header_values);
477
478			return $cek;
479			}
480
481			/**
482			* @param int $size
483			*
484			* @return string
485			*/
486			private function createCEK($size)
487			{
488			return $this->generateRandomString($size / 8);
489			}
490
491			/**
492			* @param int $size
493			*
494			* @return string
495			*/
496			private function createIV($size)
497			{
498			return $this->generateRandomString($size / 8);
499			}
500
501			/**
502			* @param int $length
503			*
504			* @return string
505			*/
506			private function generateRandomString($length)
507			{
508			if (function_exists('random_bytes')) {
509			return random_bytes($length);
510			} else {
511			return openssl_random_pseudo_bytes($length);
512			}
513			}
514			}
515

Spomky-Labs / jose

Push — v2.0.x ( 149802...dc4bfa )

getEncryptedKeyFroKeyAgreementAlgorithm() A

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