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

Completed

Push — master ( d7fc29...6ab837 )

by Florent

created 2016-07-21 11:51 UTC

Encrypter::findKeyEncryptionAlgorithm() A

↳ Parent: Encrypter

Complexity

Conditions	1
Paths	1

Size

Total Lines	8
Code Lines	5

Duplication

Lines	0
Ratio	0 %

Importance

Changes	1
Bugs	0	Features	1

Metric	Value
c	1
b	0
f	1
dl	0
loc	8
rs	9.4285
cc	1
eloc	5
nc	1
nop	1

<?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 Assert\Assertion;
use Base64Url\Base64Url;

final class Encrypter implements EncrypterInterface
{
    use Behaviour\HasKeyChecker;
    use Behaviour\HasJWAManager;
    use Behaviour\HasCompressionManager;
    use Behaviour\CommonCipheringMethods;
    use Behaviour\EncrypterTrait;

    /**
     * {@inheritdoc}
     */
    public static function createEncrypter(array $key_encryption_algorithms, array $content_encryption_algorithms, array $compression_methods = ['DEF', 'ZLIB', 'GZ'])
    {
        $encrypter = new self($key_encryption_algorithms, $content_encryption_algorithms, $compression_methods);

        return $encrypter;
    }

    /**
     * Decrypter constructor.
     *
     * @param string[]|\Jose\Algorithm\KeyEncryptionAlgorithmInterface[]     $key_encryption_algorithms
     * @param string[]|\Jose\Algorithm\ContentEncryptionAlgorithmInterface[] $content_encryption_algorithms
     * @param string[]|\Jose\Compression\CompressionInterface[]              $compression_methods
     */
    public function __construct(array $key_encryption_algorithms, array $content_encryption_algorithms, array $compression_methods)
    {
        $this->setKeyEncryptionAlgorithms($key_encryption_algorithms);
        $this->setContentEncryptionAlgorithms($content_encryption_algorithms);
        $this->setCompressionMethods($compression_methods);
        $this->setJWAManager(Factory\AlgorithmManagerFactory::createAlgorithmManager(array_merge($key_encryption_algorithms, $content_encryption_algorithms)));
        $this->setCompressionManager(Factory\CompressionManagerFactory::createCompressionManager($compression_methods));
    }

    /**
     * {@inheritdoc}
     */
    public function encrypt(Object\JWEInterface &$jwe)
    {
        Assertion::false($jwe->isEncrypted(), 'The JWE is already encrypted.');
        Assertion::greaterThan($jwe->countRecipients(), 0, 'The JWE does not contain recipient.');
        $additional_headers = [];
        $nb_recipients = $jwe->countRecipients();
        $content_encryption_algorithm = $this->getContentEncryptionAlgorithm($jwe);
        $compression_method = $this->getCompressionMethod($jwe);
        $key_management_mode = $this->getKeyManagementMode($jwe);
        $cek = $this->determineCEK($jwe, $content_encryption_algorithm, $key_management_mode, $additional_headers);

        for ($i = 0; $i < $nb_recipients; $i++) {
            $this->processRecipient($jwe, $jwe->getRecipient($i), $cek, $content_encryption_algorithm, $additional_headers);
        }

        if (!empty($additional_headers) && 1 === $jwe->countRecipients()) {
            $jwe = $jwe->withSharedProtectedHeaders(array_merge($jwe->getSharedProtectedHeaders(), $additional_headers));
        }

        $iv_size = $content_encryption_algorithm->getIVSize();
        $iv = $this->createIV($iv_size);

        $this->encryptJWE($jwe, $content_encryption_algorithm, $cek, $iv, $compression_method);
    }

    /**
     * @param \Jose\Object\JWEInterface                           $jwe
     * @param \Jose\Object\RecipientInterface                     $recipient
     * @param string                                              $cek
     * @param \Jose\Algorithm\ContentEncryptionAlgorithmInterface $content_encryption_algorithm
     * @param array                                               $additional_headers
     */
    private function processRecipient(Object\JWEInterface $jwe, Object\RecipientInterface &$recipient, $cek, Algorithm\ContentEncryptionAlgorithmInterface $content_encryption_algorithm, array &$additional_headers)
    {
        if (null === $recipient->getRecipientKey()) {
            return;
        }
        $complete_headers = array_merge($jwe->getSharedProtectedHeaders(), $jwe->getSharedHeaders(), $recipient->getHeaders());
        $key_encryption_algorithm = $this->findKeyEncryptionAlgorithm($complete_headers);
        $this->checkKeys($key_encryption_algorithm, $content_encryption_algorithm, $recipient->getRecipientKey());
/** @return stdClass|null */
function mayReturnNull() { }

function doesNotAcceptNull(stdClass $x) { }

// With potential error.
function withoutCheck() {
    $x = mayReturnNull();
    doesNotAcceptNull($x); // Potential error here.
}

// Safe - Alternative 1
function withCheck1() {
    $x = mayReturnNull();
    if ( ! $x instanceof stdClass) {
        throw new \LogicException('$x must be defined.');
    }
    doesNotAcceptNull($x);
}

// Safe - Alternative 2
function withCheck2() {
    $x = mayReturnNull();
    if ($x instanceof stdClass) {
        doesNotAcceptNull($x);
    }
}
        $encrypted_content_encryption_key = $this->getEncryptedKey($complete_headers, $cek, $key_encryption_algorithm, $content_encryption_algorithm, $additional_headers, $recipient->getRecipientKey());
/** @return stdClass|null */
function mayReturnNull() { }

function doesNotAcceptNull(stdClass $x) { }

// With potential error.
function withoutCheck() {
    $x = mayReturnNull();
    doesNotAcceptNull($x); // Potential error here.
}

// Safe - Alternative 1
function withCheck1() {
    $x = mayReturnNull();
    if ( ! $x instanceof stdClass) {
        throw new \LogicException('$x must be defined.');
    }
    doesNotAcceptNull($x);
}

// Safe - Alternative 2
function withCheck2() {
    $x = mayReturnNull();
    if ($x instanceof stdClass) {
        doesNotAcceptNull($x);
    }
}
        $recipient_headers = $recipient->getHeaders();
        if (!empty($additional_headers) && 1 !== $jwe->countRecipients()) {
            $recipient_headers = array_merge($recipient_headers, $additional_headers);
            $additional_headers = [];
        }

        $recipient = Object\Recipient::createRecipientFromLoadedJWE($recipient_headers, $encrypted_content_encryption_key);
    }

    /**
     * @param \Jose\Object\JWEInterface                           $jwe
     * @param \Jose\Algorithm\ContentEncryptionAlgorithmInterface $content_encryption_algorithm
     * @param string                                              $cek
     * @param string                                              $iv
     * @param \Jose\Compression\CompressionInterface|null         $compression_method
     */
    private function encryptJWE(Object\JWEInterface &$jwe, Algorithm\ContentEncryptionAlgorithmInterface $content_encryption_algorithm, $cek, $iv, Compression\CompressionInterface $compression_method = null)
    {
        if (!empty($jwe->getSharedProtectedHeaders())) {
            $jwe = $jwe->withEncodedSharedProtectedHeaders(Base64Url::encode(json_encode($jwe->getSharedProtectedHeaders())));
        }

        $tag = null;
        $payload = $this->preparePayload($jwe->getPayload(), $compression_method);
        $aad = null === $jwe->getAAD() ? null : Base64Url::encode($jwe->getAAD());
        $ciphertext = $content_encryption_algorithm->encryptContent($payload, $cek, $iv, $aad, $jwe->getEncodedSharedProtectedHeaders(), $tag);
        $jwe = $jwe->withCiphertext($ciphertext);
        $jwe = $jwe->withIV($iv);

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

    /**
     * @param string                                      $payload
     * @param \Jose\Compression\CompressionInterface|null $compression_method
     *
     * @return string
     */
    private function preparePayload($payload, Compression\CompressionInterface $compression_method = null)
    {
        $prepared = is_string($payload) ? $payload : json_encode($payload);
        Assertion::notNull($prepared, 'The payload is empty or cannot encoded into JSON.');

        if (null === $compression_method) {
            return $prepared;
        }
        $compressed_payload = $compression_method->compress($prepared);
        Assertion::string($compressed_payload, '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 array                                               $additional_headers
     *
     * @return string|null
     */
    private function getEncryptedKey(array $complete_headers, $cek, Algorithm\KeyEncryptionAlgorithmInterface $key_encryption_algorithm, Algorithm\ContentEncryptionAlgorithmInterface $content_encryption_algorithm, array &$additional_headers, Object\JWKInterface $recipient_key)
    {
        if ($key_encryption_algorithm instanceof Algorithm\KeyEncryption\KeyEncryptionInterface) {
            return $this->getEncryptedKeyFromKeyEncryptionAlgorithm($complete_headers, $cek, $key_encryption_algorithm, $recipient_key, $additional_headers);
        } elseif ($key_encryption_algorithm instanceof Algorithm\KeyEncryption\KeyWrappingInterface) {
            return $this->getEncryptedKeyFromKeyWrappingAlgorithm($complete_headers, $cek, $key_encryption_algorithm, $recipient_key, $additional_headers);
        } elseif ($key_encryption_algorithm instanceof Algorithm\KeyEncryption\KeyAgreementWrappingInterface) {
            return $this->getEncryptedKeyFromKeyAgreementAndKeyWrappingAlgorithm($complete_headers, $cek, $key_encryption_algorithm, $content_encryption_algorithm, $additional_headers, $recipient_key);
        }
    }

    /**
     * @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
     *
     * @return string
     */
    private function getEncryptedKeyFromKeyAgreementAndKeyWrappingAlgorithm(array $complete_headers, $cek, Algorithm\KeyEncryption\KeyAgreementWrappingInterface $key_encryption_algorithm, Algorithm\ContentEncryptionAlgorithmInterface $content_encryption_algorithm, array &$additional_headers, Object\JWKInterface $recipient_key)
    {
        $jwt_cek = $key_encryption_algorithm->wrapAgreementKey($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
     * @param array                                                $additional_headers
     *
     * @return string
     */
    private function getEncryptedKeyFromKeyEncryptionAlgorithm(array $complete_headers, $cek, Algorithm\KeyEncryption\KeyEncryptionInterface $key_encryption_algorithm, Object\JWKInterface $recipient_key, array &$additional_headers)
    {
        return $key_encryption_algorithm->encryptKey($recipient_key,  $cek, $complete_headers, $additional_headers);
    }

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

    /**
     * @param array $complete_headers
     *
     * @return \Jose\Algorithm\KeyEncryptionAlgorithmInterface
     */
    private function findKeyEncryptionAlgorithm(array $complete_headers)
    {
        Assertion::keyExists($complete_headers, 'alg', 'Parameter "alg" is missing.');
        $key_encryption_algorithm = $this->getJWAManager()->getAlgorithm($complete_headers['alg']);
        Assertion::isInstanceOf($key_encryption_algorithm, Algorithm\KeyEncryptionAlgorithmInterface::class, sprintf('The key encryption algorithm "%s" is not supported or not a key encryption algorithm instance.', $complete_headers['alg']));

        return $key_encryption_algorithm;
    }
}


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 Assert\Assertion;
15			use Base64Url\Base64Url;
16
17			final class Encrypter implements EncrypterInterface
18			{
19			use Behaviour\HasKeyChecker;
20			use Behaviour\HasJWAManager;
21			use Behaviour\HasCompressionManager;
22			use Behaviour\CommonCipheringMethods;
23			use Behaviour\EncrypterTrait;
24
25			/**
26			* {@inheritdoc}
27			*/
28			public static function createEncrypter(array $key_encryption_algorithms, array $content_encryption_algorithms, array $compression_methods = ['DEF', 'ZLIB', 'GZ'])
29			{
30			$encrypter = new self($key_encryption_algorithms, $content_encryption_algorithms, $compression_methods);
31
32			return $encrypter;
33			}
34
35			/**
36			* Decrypter constructor.
37			*
38			* @param string[]\|\Jose\Algorithm\KeyEncryptionAlgorithmInterface[] $key_encryption_algorithms
39			* @param string[]\|\Jose\Algorithm\ContentEncryptionAlgorithmInterface[] $content_encryption_algorithms
40			* @param string[]\|\Jose\Compression\CompressionInterface[] $compression_methods
41			*/
42			public function __construct(array $key_encryption_algorithms, array $content_encryption_algorithms, array $compression_methods)
43			{
44			$this->setKeyEncryptionAlgorithms($key_encryption_algorithms);
45			$this->setContentEncryptionAlgorithms($content_encryption_algorithms);
46			$this->setCompressionMethods($compression_methods);
47			$this->setJWAManager(Factory\AlgorithmManagerFactory::createAlgorithmManager(array_merge($key_encryption_algorithms, $content_encryption_algorithms)));
48			$this->setCompressionManager(Factory\CompressionManagerFactory::createCompressionManager($compression_methods));
49			}
50
51			/**
52			* {@inheritdoc}
53			*/
54			public function encrypt(Object\JWEInterface &$jwe)
55			{
56			Assertion::false($jwe->isEncrypted(), 'The JWE is already encrypted.');
57			Assertion::greaterThan($jwe->countRecipients(), 0, 'The JWE does not contain recipient.');
58			$additional_headers = [];
59			$nb_recipients = $jwe->countRecipients();
60			$content_encryption_algorithm = $this->getContentEncryptionAlgorithm($jwe);
61			$compression_method = $this->getCompressionMethod($jwe);
62			$key_management_mode = $this->getKeyManagementMode($jwe);
63			$cek = $this->determineCEK($jwe, $content_encryption_algorithm, $key_management_mode, $additional_headers);
64
65			for ($i = 0; $i < $nb_recipients; $i++) {
66			$this->processRecipient($jwe, $jwe->getRecipient($i), $cek, $content_encryption_algorithm, $additional_headers);
67			}
68
69			if (!empty($additional_headers) && 1 === $jwe->countRecipients()) {
70			$jwe = $jwe->withSharedProtectedHeaders(array_merge($jwe->getSharedProtectedHeaders(), $additional_headers));
71			}
72
73			$iv_size = $content_encryption_algorithm->getIVSize();
74			$iv = $this->createIV($iv_size);
75
76			$this->encryptJWE($jwe, $content_encryption_algorithm, $cek, $iv, $compression_method);
77			}
78
79			/**
80			* @param \Jose\Object\JWEInterface $jwe
81			* @param \Jose\Object\RecipientInterface $recipient
82			* @param string $cek
83			* @param \Jose\Algorithm\ContentEncryptionAlgorithmInterface $content_encryption_algorithm
84			* @param array $additional_headers
85			*/
86			private function processRecipient(Object\JWEInterface $jwe, Object\RecipientInterface &$recipient, $cek, Algorithm\ContentEncryptionAlgorithmInterface $content_encryption_algorithm, array &$additional_headers)
87			{
88			if (null === $recipient->getRecipientKey()) {
89			return;
90			}
91			$complete_headers = array_merge($jwe->getSharedProtectedHeaders(), $jwe->getSharedHeaders(), $recipient->getHeaders());
92			$key_encryption_algorithm = $this->findKeyEncryptionAlgorithm($complete_headers);
93			$this->checkKeys($key_encryption_algorithm, $content_encryption_algorithm, $recipient->getRecipientKey());
			0 ignored issues – show Bug introduced 2016-07-21 11:54 UTC by Report Bug Copy Issue Report It seems like `$key_encryption_algorithm` defined by `$this->findKeyEncryption...ithm($complete_headers)` on line `92` can be `null`; however, `Jose\Behaviour\EncrypterTrait::checkKeys()` does not accept `null`, maybe add an additional type check? Unless you are absolutely sure that the expression can never be null because of other conditions, we strongly recommend to add an additional type check to your code: /** @return stdClass\|null */ function mayReturnNull() { } function doesNotAcceptNull(stdClass $x) { } // With potential error. function withoutCheck() { $x = mayReturnNull(); doesNotAcceptNull($x); // Potential error here. } // Safe - Alternative 1 function withCheck1() { $x = mayReturnNull(); if ( ! $x instanceof stdClass) { throw new \LogicException('$x must be defined.'); } doesNotAcceptNull($x); } // Safe - Alternative 2 function withCheck2() { $x = mayReturnNull(); if ($x instanceof stdClass) { doesNotAcceptNull($x); } } Loading history...
94			$encrypted_content_encryption_key = $this->getEncryptedKey($complete_headers, $cek, $key_encryption_algorithm, $content_encryption_algorithm, $additional_headers, $recipient->getRecipientKey());
			0 ignored issues – show Bug introduced 2016-07-20 13:22 UTC by Report Bug Copy Issue Report It seems like `$key_encryption_algorithm` defined by `$this->findKeyEncryption...ithm($complete_headers)` on line `92` can be `null`; however, `Jose\Encrypter::getEncryptedKey()` does not accept `null`, maybe add an additional type check? Unless you are absolutely sure that the expression can never be null because of other conditions, we strongly recommend to add an additional type check to your code: /** @return stdClass\|null */ function mayReturnNull() { } function doesNotAcceptNull(stdClass $x) { } // With potential error. function withoutCheck() { $x = mayReturnNull(); doesNotAcceptNull($x); // Potential error here. } // Safe - Alternative 1 function withCheck1() { $x = mayReturnNull(); if ( ! $x instanceof stdClass) { throw new \LogicException('$x must be defined.'); } doesNotAcceptNull($x); } // Safe - Alternative 2 function withCheck2() { $x = mayReturnNull(); if ($x instanceof stdClass) { doesNotAcceptNull($x); } } Loading history...
95			$recipient_headers = $recipient->getHeaders();
96			if (!empty($additional_headers) && 1 !== $jwe->countRecipients()) {
97			$recipient_headers = array_merge($recipient_headers, $additional_headers);
98			$additional_headers = [];
99			}
100
101			$recipient = Object\Recipient::createRecipientFromLoadedJWE($recipient_headers, $encrypted_content_encryption_key);
102			}
103
104			/**
105			* @param \Jose\Object\JWEInterface $jwe
106			* @param \Jose\Algorithm\ContentEncryptionAlgorithmInterface $content_encryption_algorithm
107			* @param string $cek
108			* @param string $iv
109			* @param \Jose\Compression\CompressionInterface\|null $compression_method
110			*/
111			private function encryptJWE(Object\JWEInterface &$jwe, Algorithm\ContentEncryptionAlgorithmInterface $content_encryption_algorithm, $cek, $iv, Compression\CompressionInterface $compression_method = null)
112			{
113			if (!empty($jwe->getSharedProtectedHeaders())) {
114			$jwe = $jwe->withEncodedSharedProtectedHeaders(Base64Url::encode(json_encode($jwe->getSharedProtectedHeaders())));
115			}
116
117			$tag = null;
118			$payload = $this->preparePayload($jwe->getPayload(), $compression_method);
119			$aad = null === $jwe->getAAD() ? null : Base64Url::encode($jwe->getAAD());
120			$ciphertext = $content_encryption_algorithm->encryptContent($payload, $cek, $iv, $aad, $jwe->getEncodedSharedProtectedHeaders(), $tag);
121			$jwe = $jwe->withCiphertext($ciphertext);
122			$jwe = $jwe->withIV($iv);
123
124			if (null !== $tag) {
125			$jwe = $jwe->withTag($tag);
126			}
127			}
128
129			/**
130			* @param string $payload
131			* @param \Jose\Compression\CompressionInterface\|null $compression_method
132			*
133			* @return string
134			*/
135			private function preparePayload($payload, Compression\CompressionInterface $compression_method = null)
136			{
137			$prepared = is_string($payload) ? $payload : json_encode($payload);
138			Assertion::notNull($prepared, 'The payload is empty or cannot encoded into JSON.');
139
140			if (null === $compression_method) {
141			return $prepared;
142			}
143			$compressed_payload = $compression_method->compress($prepared);
144			Assertion::string($compressed_payload, 'Compression failed.');
145
146			return $compressed_payload;
147			}
148
149			/**
150			* @param array $complete_headers
151			* @param string $cek
152			* @param \Jose\Algorithm\KeyEncryptionAlgorithmInterface $key_encryption_algorithm
153			* @param \Jose\Algorithm\ContentEncryptionAlgorithmInterface $content_encryption_algorithm
154			* @param \Jose\Object\JWKInterface $recipient_key
155			* @param array $additional_headers
156			*
157			* @return string\|null
158			*/
159			private function getEncryptedKey(array $complete_headers, $cek, Algorithm\KeyEncryptionAlgorithmInterface $key_encryption_algorithm, Algorithm\ContentEncryptionAlgorithmInterface $content_encryption_algorithm, array &$additional_headers, Object\JWKInterface $recipient_key)
160			{
161			if ($key_encryption_algorithm instanceof Algorithm\KeyEncryption\KeyEncryptionInterface) {
162			return $this->getEncryptedKeyFromKeyEncryptionAlgorithm($complete_headers, $cek, $key_encryption_algorithm, $recipient_key, $additional_headers);
163			} elseif ($key_encryption_algorithm instanceof Algorithm\KeyEncryption\KeyWrappingInterface) {
164			return $this->getEncryptedKeyFromKeyWrappingAlgorithm($complete_headers, $cek, $key_encryption_algorithm, $recipient_key, $additional_headers);
165			} elseif ($key_encryption_algorithm instanceof Algorithm\KeyEncryption\KeyAgreementWrappingInterface) {
166			return $this->getEncryptedKeyFromKeyAgreementAndKeyWrappingAlgorithm($complete_headers, $cek, $key_encryption_algorithm, $content_encryption_algorithm, $additional_headers, $recipient_key);
167			}
168			}
169
170			/**
171			* @param array $complete_headers
172			* @param string $cek
173			* @param \Jose\Algorithm\KeyEncryption\KeyAgreementWrappingInterface $key_encryption_algorithm
174			* @param \Jose\Algorithm\ContentEncryptionAlgorithmInterface $content_encryption_algorithm
175			* @param array $additional_headers
176			* @param \Jose\Object\JWKInterface $recipient_key
177			*
178			* @return string
179			*/
180			private function getEncryptedKeyFromKeyAgreementAndKeyWrappingAlgorithm(array $complete_headers, $cek, Algorithm\KeyEncryption\KeyAgreementWrappingInterface $key_encryption_algorithm, Algorithm\ContentEncryptionAlgorithmInterface $content_encryption_algorithm, array &$additional_headers, Object\JWKInterface $recipient_key)
181			{
182			$jwt_cek = $key_encryption_algorithm->wrapAgreementKey($recipient_key, $cek, $content_encryption_algorithm->getCEKSize(), $complete_headers, $additional_headers);
183
184			return $jwt_cek;
185			}
186
187			/**
188			* @param array $complete_headers
189			* @param string $cek
190			* @param \Jose\Algorithm\KeyEncryption\KeyEncryptionInterface $key_encryption_algorithm
191			* @param \Jose\Object\JWKInterface $recipient_key
192			* @param array $additional_headers
193			*
194			* @return string
195			*/
196			private function getEncryptedKeyFromKeyEncryptionAlgorithm(array $complete_headers, $cek, Algorithm\KeyEncryption\KeyEncryptionInterface $key_encryption_algorithm, Object\JWKInterface $recipient_key, array &$additional_headers)
197			{
198			return $key_encryption_algorithm->encryptKey($recipient_key, $cek, $complete_headers, $additional_headers);
199			}
200
201			/**
202			* @param array $complete_headers
203			* @param string $cek
204			* @param \Jose\Algorithm\KeyEncryption\KeyWrappingInterface $key_encryption_algorithm
205			* @param \Jose\Object\JWKInterface $recipient_key
206			* @param array $additional_headers
207			*
208			* @return string
209			*/
210			private function getEncryptedKeyFromKeyWrappingAlgorithm(array $complete_headers, $cek, Algorithm\KeyEncryption\KeyWrappingInterface $key_encryption_algorithm, Object\JWKInterface $recipient_key, &$additional_headers)
211			{
212			return $key_encryption_algorithm->wrapKey($recipient_key, $cek, $complete_headers, $additional_headers);
213			}
214
215			/**
216			* @param array $complete_headers
217			*
218			* @return \Jose\Algorithm\KeyEncryptionAlgorithmInterface
219			*/
220			private function findKeyEncryptionAlgorithm(array $complete_headers)
221			{
222			Assertion::keyExists($complete_headers, 'alg', 'Parameter "alg" is missing.');
223			$key_encryption_algorithm = $this->getJWAManager()->getAlgorithm($complete_headers['alg']);
224			Assertion::isInstanceOf($key_encryption_algorithm, Algorithm\KeyEncryptionAlgorithmInterface::class, sprintf('The key encryption algorithm "%s" is not supported or not a key encryption algorithm instance.', $complete_headers['alg']));
225
226			return $key_encryption_algorithm;
227			}
228			}
229

Spomky-Labs / jose

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Encrypter::findKeyEncryptionAlgorithm() A

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