JWEBuilder::createCEK() - Code Metrics - Inspection of "Thumbprint command" - Spomky-Labs/jose - Measure and Improve Code Quality continuously with Scrutinizer

Failed Conditions

Push — v7 ( 6b9564...530848 )

by Florent

created 2017-09-20 11:50 UTC

JWEBuilder::createCEK() A

↳ Parent: JWEBuilder

Complexity

Conditions	1
Paths	1

Size

Total Lines	4
Code Lines	2

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
dl	0
loc	4
rs	10
c	0
b	0
f	0
cc	1
eloc	2
nc	1
nop	1

<?php

declare(strict_types=1);

/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2014-2017 Spomky-Labs
 *
 * This software may be modified and distributed under the terms
 * of the MIT license.  See the LICENSE file for details.
 */

namespace Jose\Component\Encryption;

use Base64Url\Base64Url;
use Jose\Component\Core\Converter\JsonConverterInterface;
use Jose\Component\Core\AlgorithmManager;
use Jose\Component\Core\JWK;
use Jose\Component\Core\Util\KeyChecker;
use Jose\Component\Encryption\Algorithm\ContentEncryptionAlgorithmInterface;
use Jose\Component\Encryption\Algorithm\KeyEncryption\DirectEncryptionInterface;
use Jose\Component\Encryption\Algorithm\KeyEncryption\KeyAgreementInterface;
use Jose\Component\Encryption\Algorithm\KeyEncryption\KeyAgreementWrappingInterface;
use Jose\Component\Encryption\Algorithm\KeyEncryption\KeyEncryptionInterface;
use Jose\Component\Encryption\Algorithm\KeyEncryption\KeyWrappingInterface;
use Jose\Component\Encryption\Algorithm\KeyEncryptionAlgorithmInterface;
use Jose\Component\Encryption\Compression\CompressionMethodInterface;
use Jose\Component\Encryption\Compression\CompressionMethodManager;

/**
 * Class JWEBuilder.
 */
final class JWEBuilder
{
    /**
     * @var JsonConverterInterface
     */
    private $jsonConverter;

    /**
     * @var string
     */
    private $payload;

    /**
     * @var string|null
     */
    private $aad;

    /**
     * @var array
     */
    private $recipients = [];

    /**
     * @var AlgorithmManager
     */
    private $keyEncryptionAlgorithmManager;

    /**
     * @var AlgorithmManager
     */
    private $contentEncryptionAlgorithmManager;

    /**
     * @var CompressionMethodManager
     */
    private $compressionManager;

    /**
     * @var array
     */
    private $sharedProtectedHeaders = [];

    /**
     * @var array
     */
    private $sharedHeaders = [];

    /**
     * @var null|CompressionMethodInterface
     */
    private $compressionMethod = null;

    /**
     * @var null|ContentEncryptionAlgorithmInterface
     */
    private $contentEncryptionAlgorithm = null;

    /**
     * @var null|string
     */
    private $keyManagementMode = null;

    /**
     * JWEBuilder constructor.
     *
     * @param JsonConverterInterface   $jsonConverter
     * @param AlgorithmManager         $keyEncryptionAlgorithmManager
     * @param AlgorithmManager         $contentEncryptionAlgorithmManager
     * @param CompressionMethodManager $compressionManager
     */
    public function __construct(JsonConverterInterface $jsonConverter, AlgorithmManager $keyEncryptionAlgorithmManager, AlgorithmManager $contentEncryptionAlgorithmManager, CompressionMethodManager $compressionManager)
    {
        $this->jsonConverter = $jsonConverter;
        $this->keyEncryptionAlgorithmManager = $keyEncryptionAlgorithmManager;
        $this->contentEncryptionAlgorithmManager = $contentEncryptionAlgorithmManager;
        $this->compressionManager = $compressionManager;
    }

    /**
     * @return string[]
     */
    public function getSupportedKeyEncryptionAlgorithms(): array
    {
        return $this->keyEncryptionAlgorithmManager->list();
    }

    /**
     * @return string[]
     */
    public function getSupportedContentEncryptionAlgorithms(): array
    {
        return $this->contentEncryptionAlgorithmManager->list();
    }

    /**
     * @return string[]
     */
    public function getSupportedCompressionMethods(): array
    {
        return $this->compressionManager->list();
    }

    /**
     * @param mixed $payload
     *
     * @return JWEBuilder
     */
    public function withPayload($payload): JWEBuilder
    {
        $payload = is_string($payload) ? $payload : $this->jsonConverter->encode($payload);
        if (false === mb_detect_encoding($payload, 'UTF-8', true)) {
            throw new \InvalidArgumentException('The payload must be encoded in UTF-8');
        }
        $clone = clone $this;
        $clone->payload = $payload;

        return $clone;
    }

    /**
     * @param string|null $aad
     *
     * @return JWEBuilder
     */
    public function withAAD(?string $aad): JWEBuilder
    {
        $clone = clone $this;
        $clone->aad = $aad;

        return $clone;
    }

    /**
     * @param array $sharedProtectedHeaders
     *
     * @return JWEBuilder
     */
    public function withSharedProtectedHeaders(array $sharedProtectedHeaders): JWEBuilder
    {
        $this->checkDuplicatedHeaderParameters($sharedProtectedHeaders, $this->sharedHeaders);
        foreach ($this->recipients as $recipient) {
            $this->checkDuplicatedHeaderParameters($sharedProtectedHeaders, $recipient->getHeaders());
        }
        $clone = clone $this;
        $clone->sharedProtectedHeaders = $sharedProtectedHeaders;

        return $clone;
    }

    /**
     * @param array $sharedHeaders
     *
     * @return JWEBuilder
     */
    public function withSharedHeaders(array $sharedHeaders): JWEBuilder
    {
        $this->checkDuplicatedHeaderParameters($this->sharedProtectedHeaders, $sharedHeaders);
        foreach ($this->recipients as $recipient) {
            $this->checkDuplicatedHeaderParameters($sharedHeaders, $recipient->getHeaders());
        }
        $clone = clone $this;
        $clone->sharedHeaders = $sharedHeaders;

        return $clone;
    }

    /**
     * @param JWK   $recipientKey
     * @param array $recipientHeaders
     *
     * @return JWEBuilder
     */
    public function addRecipient(JWK $recipientKey, array $recipientHeaders = []): JWEBuilder
    {
        $this->checkDuplicatedHeaderParameters($this->sharedProtectedHeaders, $recipientHeaders);
        $this->checkDuplicatedHeaderParameters($this->sharedHeaders, $recipientHeaders);
        $clone = clone $this;
        $completeHeaders = array_merge($clone->sharedHeaders, $recipientHeaders, $clone->sharedProtectedHeaders);
        $clone->checkAndSetContentEncryptionAlgorithm($completeHeaders);
        $keyEncryptionAlgorithm = $clone->getKeyEncryptionAlgorithm($completeHeaders);
        if (null === $clone->keyManagementMode) {
            $clone->keyManagementMode = $keyEncryptionAlgorithm->getKeyManagementMode();
        } else {
            if (!$clone->areKeyManagementModesCompatible($clone->keyManagementMode, $keyEncryptionAlgorithm->getKeyManagementMode())) {
                throw new \InvalidArgumentException('Foreign key management mode forbidden.');
            }
        }

        $compressionMethod = $clone->getCompressionMethod($completeHeaders);
        if (null !== $compressionMethod) {
            if (null === $clone->compressionMethod) {
                $clone->compressionMethod = $compressionMethod;
            } elseif ($clone->compressionMethod->name() !== $compressionMethod->name()) {
                throw new \InvalidArgumentException('Incompatible compression method.');
            }
        }
        if (null === $compressionMethod && null !== $clone->compressionMethod) {
            throw new \InvalidArgumentException('Inconsistent compression method.');
        }
        $clone->checkKey($keyEncryptionAlgorithm, $recipientKey);
        $clone->recipients[] = [
            'key' => $recipientKey,
            'headers' => $recipientHeaders,
            'key_encryption_algorithm' => $keyEncryptionAlgorithm,
        ];

        return $clone;
    }

    /**
     * @return JWE
     */
    public function build(): JWE
    {
        if (0 === count($this->recipients)) {
            throw new \LogicException('No recipient.');
        }

        $additionalHeaders = [];
        $cek = $this->determineCEK($additionalHeaders);

        $recipients = [];
        foreach ($this->recipients as $recipient) {
            $recipient = $this->processRecipient($recipient, $cek, $additionalHeaders);
            $recipients[] = $recipient;
        }

        if (!empty($additionalHeaders) && 1 === count($this->recipients)) {
            $sharedProtectedHeaders = array_merge($additionalHeaders, $this->sharedProtectedHeaders);
        } else {
            $sharedProtectedHeaders = $this->sharedProtectedHeaders;
        }
        $encodedSharedProtectedHeaders = empty($sharedProtectedHeaders) ? '' : Base64Url::encode($this->jsonConverter->encode($sharedProtectedHeaders));

        list($ciphertext, $iv, $tag) = $this->encryptJWE($cek, $encodedSharedProtectedHeaders);

        return JWE::create($ciphertext, $iv, $this->aad, $tag, $this->sharedHeaders, $sharedProtectedHeaders, $encodedSharedProtectedHeaders, $recipients);
    }

    /**
     * @param array $completeHeaders
     */
    private function checkAndSetContentEncryptionAlgorithm(array $completeHeaders): void
    {
        $contentEncryptionAlgorithm = $this->getContentEncryptionAlgorithm($completeHeaders);
        if (null === $this->contentEncryptionAlgorithm) {
            $this->contentEncryptionAlgorithm = $contentEncryptionAlgorithm;
        } elseif ($contentEncryptionAlgorithm->name() !== $this->contentEncryptionAlgorithm->name()) {
            throw new \InvalidArgumentException('Inconsistent content encryption algorithm');
        }
    }

    /**
     * @param array  $recipient
     * @param string $cek
     * @param array  $additionalHeaders
     *
     * @return Recipient
     */
    private function processRecipient(array $recipient, string $cek, array &$additionalHeaders): Recipient
    {
        $completeHeaders = array_merge($this->sharedHeaders, $recipient['headers'], $this->sharedProtectedHeaders);
        /** @var KeyEncryptionAlgorithmInterface $keyEncryptionAlgorithm */
        $keyEncryptionAlgorithm = $recipient['key_encryption_algorithm'];
        $encryptedContentEncryptionKey = $this->getEncryptedKey($completeHeaders, $cek, $keyEncryptionAlgorithm, $additionalHeaders, $recipient['key']);
        $recipientHeaders = $recipient['headers'];
        if (!empty($additionalHeaders) && 1 !== count($this->recipients)) {
            $recipientHeaders = array_merge($recipientHeaders, $additionalHeaders);
            $additionalHeaders = [];
        }

        return Recipient::create($recipientHeaders, $encryptedContentEncryptionKey);
    }

    /**
     * @param string $cek
     * @param string $encodedSharedProtectedHeaders
     *
     * @return array
     */
    private function encryptJWE(string $cek, string $encodedSharedProtectedHeaders): array
    {
        $tag = null;
        $iv_size = $this->contentEncryptionAlgorithm->getIVSize();
        $iv = $this->createIV($iv_size);
        $payload = $this->preparePayload();
        $aad = $this->aad ? Base64Url::encode($this->aad) : null;
        $ciphertext = $this->contentEncryptionAlgorithm->encryptContent($payload, $cek, $iv, $aad, $encodedSharedProtectedHeaders, $tag);

        return [$ciphertext, $iv, $tag];
    }

    /**
     * @return string
     */
    private function preparePayload(): ?string
    {
        $prepared = $this->payload;

        if (null === $this->compressionMethod) {
            return $prepared;
        }
        $compressedPayload = $this->compressionMethod->compress($prepared);
        if (null === $compressedPayload) {
            throw new \RuntimeException('The payload cannot be compressed.');
        }

        return $compressedPayload;
    }

    /**
     * @param array                           $completeHeaders
     * @param string                          $cek
     * @param KeyEncryptionAlgorithmInterface $keyEncryptionAlgorithm
     * @param JWK                             $recipientKey
     * @param array                           $additionalHeaders
     *
     * @return string|null
     */
    private function getEncryptedKey(array $completeHeaders, string $cek, KeyEncryptionAlgorithmInterface $keyEncryptionAlgorithm, array &$additionalHeaders, JWK $recipientKey): ?string
    {
        if ($keyEncryptionAlgorithm instanceof KeyEncryptionInterface) {
            return $this->getEncryptedKeyFromKeyEncryptionAlgorithm($completeHeaders, $cek, $keyEncryptionAlgorithm, $recipientKey, $additionalHeaders);
        } elseif ($keyEncryptionAlgorithm instanceof KeyWrappingInterface) {
            return $this->getEncryptedKeyFromKeyWrappingAlgorithm($completeHeaders, $cek, $keyEncryptionAlgorithm, $recipientKey, $additionalHeaders);
        } elseif ($keyEncryptionAlgorithm instanceof KeyAgreementWrappingInterface) {
            return $this->getEncryptedKeyFromKeyAgreementAndKeyWrappingAlgorithm($completeHeaders, $cek, $keyEncryptionAlgorithm, $additionalHeaders, $recipientKey);
        } elseif ($keyEncryptionAlgorithm instanceof KeyAgreementInterface) {
            return null;
        } elseif ($keyEncryptionAlgorithm instanceof DirectEncryptionInterface) {
            return null;
        }

        throw new \InvalidArgumentException('Unsupported key encryption algorithm.');
    }

    /**
     * @param array                         $completeHeaders
     * @param string                        $cek
     * @param KeyAgreementWrappingInterface $keyEncryptionAlgorithm
     * @param array                         $additionalHeaders
     * @param JWK                           $recipientKey
     *
     * @return string
     */
    private function getEncryptedKeyFromKeyAgreementAndKeyWrappingAlgorithm(array $completeHeaders, string $cek, KeyAgreementWrappingInterface $keyEncryptionAlgorithm, array &$additionalHeaders, JWK $recipientKey): string
    {
        return $keyEncryptionAlgorithm->wrapAgreementKey($recipientKey, $cek, $this->contentEncryptionAlgorithm->getCEKSize(), $completeHeaders, $additionalHeaders);
    }

    /**
     * @param array                  $completeHeaders
     * @param string                 $cek
     * @param KeyEncryptionInterface $keyEncryptionAlgorithm
     * @param JWK                    $recipientKey
     * @param array                  $additionalHeaders
     *
     * @return string
     */
    private function getEncryptedKeyFromKeyEncryptionAlgorithm(array $completeHeaders, string $cek, KeyEncryptionInterface $keyEncryptionAlgorithm, JWK $recipientKey, array &$additionalHeaders): string
    {
        return $keyEncryptionAlgorithm->encryptKey($recipientKey, $cek, $completeHeaders, $additionalHeaders);
    }

    /**
     * @param array                $completeHeaders
     * @param string               $cek
     * @param KeyWrappingInterface $keyEncryptionAlgorithm
     * @param JWK                  $recipientKey
     * @param array                $additionalHeaders
     *
     * @return string
     */
    private function getEncryptedKeyFromKeyWrappingAlgorithm(array $completeHeaders, string $cek, KeyWrappingInterface $keyEncryptionAlgorithm, JWK $recipientKey, array &$additionalHeaders): string
    {
        return $keyEncryptionAlgorithm->wrapKey($recipientKey, $cek, $completeHeaders, $additionalHeaders);
    }

    /**
     * @param KeyEncryptionAlgorithmInterface $keyEncryptionAlgorithm
     * @param JWK                             $recipientKey
     */
    private function checkKey(KeyEncryptionAlgorithmInterface $keyEncryptionAlgorithm, JWK $recipientKey)
    {
        KeyChecker::checkKeyUsage($recipientKey, 'encryption');
        if ('dir' !== $keyEncryptionAlgorithm->name()) {
            KeyChecker::checkKeyAlgorithm($recipientKey, $keyEncryptionAlgorithm->name());
        } else {
            KeyChecker::checkKeyAlgorithm($recipientKey, $this->contentEncryptionAlgorithm->name());
        }
    }

    /**
     * @param array $additionalHeaders
     *
     * @return string
     */
    private function determineCEK(array &$additionalHeaders): string
    {
        switch ($this->keyManagementMode) {
            case KeyEncryptionInterface::MODE_ENCRYPT:
            case KeyEncryptionInterface::MODE_WRAP:
                return $this->createCEK($this->contentEncryptionAlgorithm->getCEKSize());
            case KeyEncryptionInterface::MODE_AGREEMENT:
                if (1 !== count($this->recipients)) {
                    throw new \LogicException('Unable to encrypt for multiple recipients using key agreement algorithms.');
                }
                /** @var JWK $key */
                $key = $this->recipients[0]['key'];
                /** @var KeyAgreementInterface $algorithm */
                $algorithm = $this->recipients[0]['key_encryption_algorithm'];
                $completeHeaders = array_merge($this->sharedHeaders, $this->recipients[0]['headers'], $this->sharedProtectedHeaders);

                return $algorithm->getAgreementKey($this->contentEncryptionAlgorithm->getCEKSize(), $this->contentEncryptionAlgorithm->name(), $key, $completeHeaders, $additionalHeaders);
            case KeyEncryptionInterface::MODE_DIRECT:
                if (1 !== count($this->recipients)) {
                    throw new \LogicException('Unable to encrypt for multiple recipients using key agreement algorithms.');
                }
                /** @var JWK $key */
                $key = $this->recipients[0]['key'];
                if ('oct' !== $key->get('kty')) {
                    throw new \RuntimeException('Wrong key type.');
                }

                return Base64Url::decode($key->get('k'));
            default:
                throw new \InvalidArgumentException(sprintf('Unsupported key management mode "%s".', $this->keyManagementMode));
        }
    }

    /**
     * @param array $completeHeaders
     *
     * @return CompressionMethodInterface|null
     */
    private function getCompressionMethod(array $completeHeaders): ?CompressionMethodInterface
    {
        if (!array_key_exists('zip', $completeHeaders)) {
            return null;
        }

        return $this->compressionManager->get($completeHeaders['zip']);
    }

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

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

        return false;
    }

    /**
     * @param int $size
     *
     * @return string
     */
    private function createCEK(int $size): string
    {
        return random_bytes($size / 8);
    }

    /**
     * @param int $size
     *
     * @return string
     */
    private function createIV(int $size): string
    {
        return random_bytes($size / 8);
    }

    /**
     * @param array $completeHeaders
     *
     * @return KeyEncryptionAlgorithmInterface
     */
    private function getKeyEncryptionAlgorithm(array $completeHeaders): KeyEncryptionAlgorithmInterface
    {
        if (!array_key_exists('alg', $completeHeaders)) {
            throw new \InvalidArgumentException('Parameter "alg" is missing.');
        }
        $keyEncryptionAlgorithm = $this->keyEncryptionAlgorithmManager->get($completeHeaders['alg']);
        if (!$keyEncryptionAlgorithm instanceof KeyEncryptionAlgorithmInterface) {
            throw new \InvalidArgumentException(sprintf('The key encryption algorithm "%s" is not supported or not a key encryption algorithm instance.', $completeHeaders['alg']));
        }

        return $keyEncryptionAlgorithm;
    }

    /**
     * @param array $completeHeaders
     *
     * @return ContentEncryptionAlgorithmInterface
     */
    private function getContentEncryptionAlgorithm(array $completeHeaders): ContentEncryptionAlgorithmInterface
    {
        if (!array_key_exists('enc', $completeHeaders)) {
            throw new \InvalidArgumentException('Parameter "enc" is missing.');
        }
        $contentEncryptionAlgorithm = $this->contentEncryptionAlgorithmManager->get($completeHeaders['enc']);
        if (!$contentEncryptionAlgorithm instanceof ContentEncryptionAlgorithmInterface) {
            throw new \InvalidArgumentException(sprintf('The content encryption algorithm "%s" is not supported or not a content encryption algorithm instance.', $completeHeaders['alg']));
        }

        return $contentEncryptionAlgorithm;
    }

    /**
     * @param array $header1
     * @param array $header2
     */
    private function checkDuplicatedHeaderParameters(array $header1, array $header2)
    {
        $inter = array_intersect_key($header1, $header2);
        if (!empty($inter)) {
            throw new \InvalidArgumentException(sprintf('The header contains duplicated entries: %s.', implode(', ', array_keys($inter))));
        }
    }
}


1			<?php
2
3			declare(strict_types=1);
4
5			/*
6			* The MIT License (MIT)
7			*
8			* Copyright (c) 2014-2017 Spomky-Labs
9			*
10			* This software may be modified and distributed under the terms
11			* of the MIT license. See the LICENSE file for details.
12			*/
13
14			namespace Jose\Component\Encryption;
15
16			use Base64Url\Base64Url;
17			use Jose\Component\Core\Converter\JsonConverterInterface;
18			use Jose\Component\Core\AlgorithmManager;
19			use Jose\Component\Core\JWK;
20			use Jose\Component\Core\Util\KeyChecker;
21			use Jose\Component\Encryption\Algorithm\ContentEncryptionAlgorithmInterface;
22			use Jose\Component\Encryption\Algorithm\KeyEncryption\DirectEncryptionInterface;
23			use Jose\Component\Encryption\Algorithm\KeyEncryption\KeyAgreementInterface;
24			use Jose\Component\Encryption\Algorithm\KeyEncryption\KeyAgreementWrappingInterface;
25			use Jose\Component\Encryption\Algorithm\KeyEncryption\KeyEncryptionInterface;
26			use Jose\Component\Encryption\Algorithm\KeyEncryption\KeyWrappingInterface;
27			use Jose\Component\Encryption\Algorithm\KeyEncryptionAlgorithmInterface;
28			use Jose\Component\Encryption\Compression\CompressionMethodInterface;
29			use Jose\Component\Encryption\Compression\CompressionMethodManager;
30
31			/**
32			* Class JWEBuilder.
33			*/
34			final class JWEBuilder
35			{
36			/**
37			* @var JsonConverterInterface
38			*/
39			private $jsonConverter;
40
41			/**
42			* @var string
43			*/
44			private $payload;
45
46			/**
47			* @var string\|null
48			*/
49			private $aad;
50
51			/**
52			* @var array
53			*/
54			private $recipients = [];
55
56			/**
57			* @var AlgorithmManager
58			*/
59			private $keyEncryptionAlgorithmManager;
60
61			/**
62			* @var AlgorithmManager
63			*/
64			private $contentEncryptionAlgorithmManager;
65
66			/**
67			* @var CompressionMethodManager
68			*/
69			private $compressionManager;
70
71			/**
72			* @var array
73			*/
74			private $sharedProtectedHeaders = [];
75
76			/**
77			* @var array
78			*/
79			private $sharedHeaders = [];
80
81			/**
82			* @var null\|CompressionMethodInterface
83			*/
84			private $compressionMethod = null;
85
86			/**
87			* @var null\|ContentEncryptionAlgorithmInterface
88			*/
89			private $contentEncryptionAlgorithm = null;
90
91			/**
92			* @var null\|string
93			*/
94			private $keyManagementMode = null;
95
96			/**
97			* JWEBuilder constructor.
98			*
99			* @param JsonConverterInterface $jsonConverter
100			* @param AlgorithmManager $keyEncryptionAlgorithmManager
101			* @param AlgorithmManager $contentEncryptionAlgorithmManager
102			* @param CompressionMethodManager $compressionManager
103			*/
104			public function __construct(JsonConverterInterface $jsonConverter, AlgorithmManager $keyEncryptionAlgorithmManager, AlgorithmManager $contentEncryptionAlgorithmManager, CompressionMethodManager $compressionManager)
105			{
106			$this->jsonConverter = $jsonConverter;
107			$this->keyEncryptionAlgorithmManager = $keyEncryptionAlgorithmManager;
108			$this->contentEncryptionAlgorithmManager = $contentEncryptionAlgorithmManager;
109			$this->compressionManager = $compressionManager;
110			}
111
112			/**
113			* @return string[]
114			*/
115			public function getSupportedKeyEncryptionAlgorithms(): array
116			{
117			return $this->keyEncryptionAlgorithmManager->list();
118			}
119
120			/**
121			* @return string[]
122			*/
123			public function getSupportedContentEncryptionAlgorithms(): array
124			{
125			return $this->contentEncryptionAlgorithmManager->list();
126			}
127
128			/**
129			* @return string[]
130			*/
131			public function getSupportedCompressionMethods(): array
132			{
133			return $this->compressionManager->list();
134			}
135
136			/**
137			* @param mixed $payload
138			*
139			* @return JWEBuilder
140			*/
141			public function withPayload($payload): JWEBuilder
142			{
143			$payload = is_string($payload) ? $payload : $this->jsonConverter->encode($payload);
144			if (false === mb_detect_encoding($payload, 'UTF-8', true)) {
145			throw new \InvalidArgumentException('The payload must be encoded in UTF-8');
146			}
147			$clone = clone $this;
148			$clone->payload = $payload;
149
150			return $clone;
151			}
152
153			/**
154			* @param string\|null $aad
155			*
156			* @return JWEBuilder
157			*/
158			public function withAAD(?string $aad): JWEBuilder
159			{
160			$clone = clone $this;
161			$clone->aad = $aad;
162
163			return $clone;
164			}
165
166			/**
167			* @param array $sharedProtectedHeaders
168			*
169			* @return JWEBuilder
170			*/
171			public function withSharedProtectedHeaders(array $sharedProtectedHeaders): JWEBuilder
172			{
173			$this->checkDuplicatedHeaderParameters($sharedProtectedHeaders, $this->sharedHeaders);
174			foreach ($this->recipients as $recipient) {
175			$this->checkDuplicatedHeaderParameters($sharedProtectedHeaders, $recipient->getHeaders());
176			}
177			$clone = clone $this;
178			$clone->sharedProtectedHeaders = $sharedProtectedHeaders;
179
180			return $clone;
181			}
182
183			/**
184			* @param array $sharedHeaders
185			*
186			* @return JWEBuilder
187			*/
188			public function withSharedHeaders(array $sharedHeaders): JWEBuilder
189			{
190			$this->checkDuplicatedHeaderParameters($this->sharedProtectedHeaders, $sharedHeaders);
191			foreach ($this->recipients as $recipient) {
192			$this->checkDuplicatedHeaderParameters($sharedHeaders, $recipient->getHeaders());
193			}
194			$clone = clone $this;
195			$clone->sharedHeaders = $sharedHeaders;
196
197			return $clone;
198			}
199
200			/**
201			* @param JWK $recipientKey
202			* @param array $recipientHeaders
203			*
204			* @return JWEBuilder
205			*/
206			public function addRecipient(JWK $recipientKey, array $recipientHeaders = []): JWEBuilder
207			{
208			$this->checkDuplicatedHeaderParameters($this->sharedProtectedHeaders, $recipientHeaders);
209			$this->checkDuplicatedHeaderParameters($this->sharedHeaders, $recipientHeaders);
210			$clone = clone $this;
211			$completeHeaders = array_merge($clone->sharedHeaders, $recipientHeaders, $clone->sharedProtectedHeaders);
212			$clone->checkAndSetContentEncryptionAlgorithm($completeHeaders);
213			$keyEncryptionAlgorithm = $clone->getKeyEncryptionAlgorithm($completeHeaders);
214			if (null === $clone->keyManagementMode) {
215			$clone->keyManagementMode = $keyEncryptionAlgorithm->getKeyManagementMode();
216			} else {
217			if (!$clone->areKeyManagementModesCompatible($clone->keyManagementMode, $keyEncryptionAlgorithm->getKeyManagementMode())) {
218			throw new \InvalidArgumentException('Foreign key management mode forbidden.');
219			}
220			}
221
222			$compressionMethod = $clone->getCompressionMethod($completeHeaders);
223			if (null !== $compressionMethod) {
224			if (null === $clone->compressionMethod) {
225			$clone->compressionMethod = $compressionMethod;
226			} elseif ($clone->compressionMethod->name() !== $compressionMethod->name()) {
227			throw new \InvalidArgumentException('Incompatible compression method.');
228			}
229			}
230			if (null === $compressionMethod && null !== $clone->compressionMethod) {
231			throw new \InvalidArgumentException('Inconsistent compression method.');
232			}
233			$clone->checkKey($keyEncryptionAlgorithm, $recipientKey);
234			$clone->recipients[] = [
235			'key' => $recipientKey,
236			'headers' => $recipientHeaders,
237			'key_encryption_algorithm' => $keyEncryptionAlgorithm,
238			];
239
240			return $clone;
241			}
242
243			/**
244			* @return JWE
245			*/
246			public function build(): JWE
247			{
248			if (0 === count($this->recipients)) {
249			throw new \LogicException('No recipient.');
250			}
251
252			$additionalHeaders = [];
253			$cek = $this->determineCEK($additionalHeaders);
254
255			$recipients = [];
256			foreach ($this->recipients as $recipient) {
257			$recipient = $this->processRecipient($recipient, $cek, $additionalHeaders);
258			$recipients[] = $recipient;
259			}
260
261			if (!empty($additionalHeaders) && 1 === count($this->recipients)) {
262			$sharedProtectedHeaders = array_merge($additionalHeaders, $this->sharedProtectedHeaders);
263			} else {
264			$sharedProtectedHeaders = $this->sharedProtectedHeaders;
265			}
266			$encodedSharedProtectedHeaders = empty($sharedProtectedHeaders) ? '' : Base64Url::encode($this->jsonConverter->encode($sharedProtectedHeaders));
267
268			list($ciphertext, $iv, $tag) = $this->encryptJWE($cek, $encodedSharedProtectedHeaders);
269
270			return JWE::create($ciphertext, $iv, $this->aad, $tag, $this->sharedHeaders, $sharedProtectedHeaders, $encodedSharedProtectedHeaders, $recipients);
271			}
272
273			/**
274			* @param array $completeHeaders
275			*/
276			private function checkAndSetContentEncryptionAlgorithm(array $completeHeaders): void
277			{
278			$contentEncryptionAlgorithm = $this->getContentEncryptionAlgorithm($completeHeaders);
279			if (null === $this->contentEncryptionAlgorithm) {
280			$this->contentEncryptionAlgorithm = $contentEncryptionAlgorithm;
281			} elseif ($contentEncryptionAlgorithm->name() !== $this->contentEncryptionAlgorithm->name()) {
282			throw new \InvalidArgumentException('Inconsistent content encryption algorithm');
283			}
284			}
285
286			/**
287			* @param array $recipient
288			* @param string $cek
289			* @param array $additionalHeaders
290			*
291			* @return Recipient
292			*/
293			private function processRecipient(array $recipient, string $cek, array &$additionalHeaders): Recipient
294			{
295			$completeHeaders = array_merge($this->sharedHeaders, $recipient['headers'], $this->sharedProtectedHeaders);
296			/** @var KeyEncryptionAlgorithmInterface $keyEncryptionAlgorithm */
297			$keyEncryptionAlgorithm = $recipient['key_encryption_algorithm'];
298			$encryptedContentEncryptionKey = $this->getEncryptedKey($completeHeaders, $cek, $keyEncryptionAlgorithm, $additionalHeaders, $recipient['key']);
299			$recipientHeaders = $recipient['headers'];
300			if (!empty($additionalHeaders) && 1 !== count($this->recipients)) {
301			$recipientHeaders = array_merge($recipientHeaders, $additionalHeaders);
302			$additionalHeaders = [];
303			}
304
305			return Recipient::create($recipientHeaders, $encryptedContentEncryptionKey);
306			}
307
308			/**
309			* @param string $cek
310			* @param string $encodedSharedProtectedHeaders
311			*
312			* @return array
313			*/
314			private function encryptJWE(string $cek, string $encodedSharedProtectedHeaders): array
315			{
316			$tag = null;
317			$iv_size = $this->contentEncryptionAlgorithm->getIVSize();
318			$iv = $this->createIV($iv_size);
319			$payload = $this->preparePayload();
320			$aad = $this->aad ? Base64Url::encode($this->aad) : null;
321			$ciphertext = $this->contentEncryptionAlgorithm->encryptContent($payload, $cek, $iv, $aad, $encodedSharedProtectedHeaders, $tag);
322
323			return [$ciphertext, $iv, $tag];
324			}
325
326			/**
327			* @return string
328			*/
329			private function preparePayload(): ?string
330			{
331			$prepared = $this->payload;
332
333			if (null === $this->compressionMethod) {
334			return $prepared;
335			}
336			$compressedPayload = $this->compressionMethod->compress($prepared);
337			if (null === $compressedPayload) {
338			throw new \RuntimeException('The payload cannot be compressed.');
339			}
340
341			return $compressedPayload;
342			}
343
344			/**
345			* @param array $completeHeaders
346			* @param string $cek
347			* @param KeyEncryptionAlgorithmInterface $keyEncryptionAlgorithm
348			* @param JWK $recipientKey
349			* @param array $additionalHeaders
350			*
351			* @return string\|null
352			*/
353			private function getEncryptedKey(array $completeHeaders, string $cek, KeyEncryptionAlgorithmInterface $keyEncryptionAlgorithm, array &$additionalHeaders, JWK $recipientKey): ?string
354			{
355			if ($keyEncryptionAlgorithm instanceof KeyEncryptionInterface) {
356			return $this->getEncryptedKeyFromKeyEncryptionAlgorithm($completeHeaders, $cek, $keyEncryptionAlgorithm, $recipientKey, $additionalHeaders);
357			} elseif ($keyEncryptionAlgorithm instanceof KeyWrappingInterface) {
358			return $this->getEncryptedKeyFromKeyWrappingAlgorithm($completeHeaders, $cek, $keyEncryptionAlgorithm, $recipientKey, $additionalHeaders);
359			} elseif ($keyEncryptionAlgorithm instanceof KeyAgreementWrappingInterface) {
360			return $this->getEncryptedKeyFromKeyAgreementAndKeyWrappingAlgorithm($completeHeaders, $cek, $keyEncryptionAlgorithm, $additionalHeaders, $recipientKey);
361			} elseif ($keyEncryptionAlgorithm instanceof KeyAgreementInterface) {
362			return null;
363			} elseif ($keyEncryptionAlgorithm instanceof DirectEncryptionInterface) {
364			return null;
365			}
366
367			throw new \InvalidArgumentException('Unsupported key encryption algorithm.');
368			}
369
370			/**
371			* @param array $completeHeaders
372			* @param string $cek
373			* @param KeyAgreementWrappingInterface $keyEncryptionAlgorithm
374			* @param array $additionalHeaders
375			* @param JWK $recipientKey
376			*
377			* @return string
378			*/
379			private function getEncryptedKeyFromKeyAgreementAndKeyWrappingAlgorithm(array $completeHeaders, string $cek, KeyAgreementWrappingInterface $keyEncryptionAlgorithm, array &$additionalHeaders, JWK $recipientKey): string
380			{
381			return $keyEncryptionAlgorithm->wrapAgreementKey($recipientKey, $cek, $this->contentEncryptionAlgorithm->getCEKSize(), $completeHeaders, $additionalHeaders);
382			}
383
384			/**
385			* @param array $completeHeaders
386			* @param string $cek
387			* @param KeyEncryptionInterface $keyEncryptionAlgorithm
388			* @param JWK $recipientKey
389			* @param array $additionalHeaders
390			*
391			* @return string
392			*/
393			private function getEncryptedKeyFromKeyEncryptionAlgorithm(array $completeHeaders, string $cek, KeyEncryptionInterface $keyEncryptionAlgorithm, JWK $recipientKey, array &$additionalHeaders): string
394			{
395			return $keyEncryptionAlgorithm->encryptKey($recipientKey, $cek, $completeHeaders, $additionalHeaders);
396			}
397
398			/**
399			* @param array $completeHeaders
400			* @param string $cek
401			* @param KeyWrappingInterface $keyEncryptionAlgorithm
402			* @param JWK $recipientKey
403			* @param array $additionalHeaders
404			*
405			* @return string
406			*/
407			private function getEncryptedKeyFromKeyWrappingAlgorithm(array $completeHeaders, string $cek, KeyWrappingInterface $keyEncryptionAlgorithm, JWK $recipientKey, array &$additionalHeaders): string
408			{
409			return $keyEncryptionAlgorithm->wrapKey($recipientKey, $cek, $completeHeaders, $additionalHeaders);
410			}
411
412			/**
413			* @param KeyEncryptionAlgorithmInterface $keyEncryptionAlgorithm
414			* @param JWK $recipientKey
415			*/
416			private function checkKey(KeyEncryptionAlgorithmInterface $keyEncryptionAlgorithm, JWK $recipientKey)
417			{
418			KeyChecker::checkKeyUsage($recipientKey, 'encryption');
419			if ('dir' !== $keyEncryptionAlgorithm->name()) {
420			KeyChecker::checkKeyAlgorithm($recipientKey, $keyEncryptionAlgorithm->name());
421			} else {
422			KeyChecker::checkKeyAlgorithm($recipientKey, $this->contentEncryptionAlgorithm->name());
423			}
424			}
425
426			/**
427			* @param array $additionalHeaders
428			*
429			* @return string
430			*/
431			private function determineCEK(array &$additionalHeaders): string
432			{
433			switch ($this->keyManagementMode) {
434			case KeyEncryptionInterface::MODE_ENCRYPT:
435			case KeyEncryptionInterface::MODE_WRAP:
436			return $this->createCEK($this->contentEncryptionAlgorithm->getCEKSize());
437			case KeyEncryptionInterface::MODE_AGREEMENT:
438			if (1 !== count($this->recipients)) {
439			throw new \LogicException('Unable to encrypt for multiple recipients using key agreement algorithms.');
440			}
441			/** @var JWK $key */
442			$key = $this->recipients[0]['key'];
443			/** @var KeyAgreementInterface $algorithm */
444			$algorithm = $this->recipients[0]['key_encryption_algorithm'];
445			$completeHeaders = array_merge($this->sharedHeaders, $this->recipients[0]['headers'], $this->sharedProtectedHeaders);
446
447			return $algorithm->getAgreementKey($this->contentEncryptionAlgorithm->getCEKSize(), $this->contentEncryptionAlgorithm->name(), $key, $completeHeaders, $additionalHeaders);
448			case KeyEncryptionInterface::MODE_DIRECT:
449			if (1 !== count($this->recipients)) {
450			throw new \LogicException('Unable to encrypt for multiple recipients using key agreement algorithms.');
451			}
452			/** @var JWK $key */
453			$key = $this->recipients[0]['key'];
454			if ('oct' !== $key->get('kty')) {
455			throw new \RuntimeException('Wrong key type.');
456			}
457
458			return Base64Url::decode($key->get('k'));
459			default:
460			throw new \InvalidArgumentException(sprintf('Unsupported key management mode "%s".', $this->keyManagementMode));
461			}
462			}
463
464			/**
465			* @param array $completeHeaders
466			*
467			* @return CompressionMethodInterface\|null
468			*/
469			private function getCompressionMethod(array $completeHeaders): ?CompressionMethodInterface
470			{
471			if (!array_key_exists('zip', $completeHeaders)) {
472			return null;
473			}
474
475			return $this->compressionManager->get($completeHeaders['zip']);
476			}
477
478			/**
479			* @param string $current
480			* @param string $new
481			*
482			* @return bool
483			*/
484			private function areKeyManagementModesCompatible(string $current, string $new): bool
485			{
486			$agree = KeyEncryptionAlgorithmInterface::MODE_AGREEMENT;
487			$dir = KeyEncryptionAlgorithmInterface::MODE_DIRECT;
488			$enc = KeyEncryptionAlgorithmInterface::MODE_ENCRYPT;
489			$wrap = KeyEncryptionAlgorithmInterface::MODE_WRAP;
490			$supportedKeyManagementModeCombinations = [$enc.$enc => true, $enc.$wrap => true, $wrap.$enc => true, $wrap.$wrap => true, $agree.$agree => false, $agree.$dir => false, $agree.$enc => false, $agree.$wrap => false, $dir.$agree => false, $dir.$dir => false, $dir.$enc => false, $dir.$wrap => false, $enc.$agree => false, $enc.$dir => false, $wrap.$agree => false, $wrap.$dir => false];
491
492			if (array_key_exists($current.$new, $supportedKeyManagementModeCombinations)) {
493			return $supportedKeyManagementModeCombinations[$current.$new];
494			}
495
496			return false;
497			}
498
499			/**
500			* @param int $size
501			*
502			* @return string
503			*/
504			private function createCEK(int $size): string
505			{
506			return random_bytes($size / 8);
507			}
508
509			/**
510			* @param int $size
511			*
512			* @return string
513			*/
514			private function createIV(int $size): string
515			{
516			return random_bytes($size / 8);
517			}
518
519			/**
520			* @param array $completeHeaders
521			*
522			* @return KeyEncryptionAlgorithmInterface
523			*/
524			private function getKeyEncryptionAlgorithm(array $completeHeaders): KeyEncryptionAlgorithmInterface
525			{
526			if (!array_key_exists('alg', $completeHeaders)) {
527			throw new \InvalidArgumentException('Parameter "alg" is missing.');
528			}
529			$keyEncryptionAlgorithm = $this->keyEncryptionAlgorithmManager->get($completeHeaders['alg']);
530			if (!$keyEncryptionAlgorithm instanceof KeyEncryptionAlgorithmInterface) {
531			throw new \InvalidArgumentException(sprintf('The key encryption algorithm "%s" is not supported or not a key encryption algorithm instance.', $completeHeaders['alg']));
532			}
533
534			return $keyEncryptionAlgorithm;
535			}
536
537			/**
538			* @param array $completeHeaders
539			*
540			* @return ContentEncryptionAlgorithmInterface
541			*/
542			private function getContentEncryptionAlgorithm(array $completeHeaders): ContentEncryptionAlgorithmInterface
543			{
544			if (!array_key_exists('enc', $completeHeaders)) {
545			throw new \InvalidArgumentException('Parameter "enc" is missing.');
546			}
547			$contentEncryptionAlgorithm = $this->contentEncryptionAlgorithmManager->get($completeHeaders['enc']);
548			if (!$contentEncryptionAlgorithm instanceof ContentEncryptionAlgorithmInterface) {
549			throw new \InvalidArgumentException(sprintf('The content encryption algorithm "%s" is not supported or not a content encryption algorithm instance.', $completeHeaders['alg']));
550			}
551
552			return $contentEncryptionAlgorithm;
553			}
554
555			/**
556			* @param array $header1
557			* @param array $header2
558			*/
559			private function checkDuplicatedHeaderParameters(array $header1, array $header2)
560			{
561			$inter = array_intersect_key($header1, $header2);
562			if (!empty($inter)) {
563			throw new \InvalidArgumentException(sprintf('The header contains duplicated entries: %s.', implode(', ', array_keys($inter))));
564			}
565			}
566			}
567

Spomky-Labs / jose

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JWEBuilder::createCEK() A

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