JWEDecrypter::decryptCEK() - Code Metrics - web-token/jwt-framework - Measure and Improve Code Quality continuously with Scrutinizer

JWEDecrypter::decryptCEK() B
last analyzed 2019-10-31 23:09 UTC

↳ Parent: JWEDecrypter

Complexity

Conditions	6
Paths	6

Size

Total Lines

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
dl	0
loc	20
rs	8.9777
c	0
b	0
f	0
cc	6
nc	6
nop	6

<?php

declare(strict_types=1);

/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2014-2019 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 InvalidArgumentException;
use Jose\Component\Core\Algorithm;
use Jose\Component\Core\AlgorithmManager;
use Jose\Component\Core\JWK;
use Jose\Component\Core\JWKSet;
use Jose\Component\Core\Util\KeyChecker;
use Jose\Component\Encryption\Algorithm\ContentEncryptionAlgorithm;
use Jose\Component\Encryption\Algorithm\KeyEncryption\DirectEncryption;
use Jose\Component\Encryption\Algorithm\KeyEncryption\KeyAgreement;
use Jose\Component\Encryption\Algorithm\KeyEncryption\KeyAgreementWithKeyWrapping;
use Jose\Component\Encryption\Algorithm\KeyEncryption\KeyEncryption;
use Jose\Component\Encryption\Algorithm\KeyEncryption\KeyWrapping;
use Jose\Component\Encryption\Algorithm\KeyEncryptionAlgorithm;
use Jose\Component\Encryption\Compression\CompressionMethodManager;
use Throwable;

class JWEDecrypter
{
    /**
     * @var AlgorithmManager
     */
    private $keyEncryptionAlgorithmManager;

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

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

    public function __construct(AlgorithmManager $keyEncryptionAlgorithmManager, AlgorithmManager $contentEncryptionAlgorithmManager, CompressionMethodManager $compressionMethodManager)
    {
        $this->keyEncryptionAlgorithmManager = $keyEncryptionAlgorithmManager;
        $this->contentEncryptionAlgorithmManager = $contentEncryptionAlgorithmManager;
        $this->compressionMethodManager = $compressionMethodManager;
    }

    /**
     * Returns the key encryption algorithm manager.
     */
    public function getKeyEncryptionAlgorithmManager(): AlgorithmManager
    {
        return $this->keyEncryptionAlgorithmManager;
    }

    /**
     * Returns the content encryption algorithm manager.
     */
    public function getContentEncryptionAlgorithmManager(): AlgorithmManager
    {
        return $this->contentEncryptionAlgorithmManager;
    }

    /**
     * Returns the compression method manager.
     */
    public function getCompressionMethodManager(): CompressionMethodManager
    {
        return $this->compressionMethodManager;
    }

    /**
     * This method will try to decrypt the given JWE and recipient using a JWK.
     *
     * @param JWE $jwe       A JWE object to decrypt
     * @param JWK $jwk       The key used to decrypt the input
     * @param int $recipient The recipient used to decrypt the token
     */
    public function decryptUsingKey(JWE &$jwe, JWK $jwk, int $recipient, ?JWK $senderKey = null): bool
    {
        $jwkset = new JWKSet([$jwk]);

        return $this->decryptUsingKeySet($jwe, $jwkset, $recipient, $senderKey);
    }

    /**
     * This method will try to decrypt the given JWE and recipient using a JWKSet.
     *
     * @param JWE    $jwe       A JWE object to decrypt
     * @param JWKSet $jwkset    The key set used to decrypt the input
     * @param JWK    $jwk       The key used to decrypt the token in case of success
     * @param int    $recipient The recipient used to decrypt the token in case of success
     *
     * @throws InvalidArgumentException if no key is set is the keyset
     * @throws InvalidArgumentException if the token has no recipients
     */
    public function decryptUsingKeySet(JWE &$jwe, JWKSet $jwkset, int $recipient, JWK &$jwk = null, ?JWK $senderKey = null): bool
    {
        if (0 === $jwkset->count()) {
            throw new InvalidArgumentException('No key in the key set.');
        }
        if (null !== $jwe->getPayload()) {
            return true;
        }
        if (0 === $jwe->countRecipients()) {
            throw new InvalidArgumentException('The JWE does not contain any recipient.');
        }

        $plaintext = $this->decryptRecipientKey($jwe, $jwkset, $recipient, $jwk, $senderKey);
        if (null !== $plaintext) {
            $jwe = $jwe->withPayload($plaintext);

            return true;
        }

        return false;
    }

    private function decryptRecipientKey(JWE $jwe, JWKSet $jwkset, int $i, JWK &$successJwk = null, ?JWK $senderKey = null): ?string
    {
        $recipient = $jwe->getRecipient($i);
        $completeHeader = array_merge($jwe->getSharedProtectedHeader(), $jwe->getSharedHeader(), $recipient->getHeader());
        $this->checkCompleteHeader($completeHeader);

        $key_encryption_algorithm = $this->getKeyEncryptionAlgorithm($completeHeader);
        $content_encryption_algorithm = $this->getContentEncryptionAlgorithm($completeHeader);

        $this->checkIvSize($jwe->getIV(), $content_encryption_algorithm->getIVSize());

        foreach ($jwkset as $recipientKey) {
            try {
                KeyChecker::checkKeyUsage($recipientKey, 'decryption');
                if ('dir' !== $key_encryption_algorithm->name()) {
                    KeyChecker::checkKeyAlgorithm($recipientKey, $key_encryption_algorithm->name());
                } else {
                    KeyChecker::checkKeyAlgorithm($recipientKey, $content_encryption_algorithm->name());
                }
                $cek = $this->decryptCEK($key_encryption_algorithm, $content_encryption_algorithm, $recipientKey, $senderKey, $recipient, $completeHeader);
                if (null !== $cek) {
                    $this->checkCekSize($cek, $key_encryption_algorithm, $content_encryption_algorithm);
                    $payload = $this->decryptPayload($jwe, $cek, $content_encryption_algorithm, $completeHeader);
                    $successJwk = $recipientKey;

                    return $payload;
                }
            } catch (Throwable $e) {
                //We do nothing, we continue with other keys
                continue;
            }
        }

        return null;
    }

    /**
     * @throws InvalidArgumentException if the Content Encryption Key size is invalid
     */
    private function checkCekSize(string $cek, KeyEncryptionAlgorithm $keyEncryptionAlgorithm, ContentEncryptionAlgorithm $algorithm): void
    {
        if ($keyEncryptionAlgorithm instanceof DirectEncryption || $keyEncryptionAlgorithm instanceof KeyAgreement) {
            return;
        }
        if (mb_strlen($cek, '8bit') * 8 !== $algorithm->getCEKSize()) {
            throw new InvalidArgumentException('Invalid CEK size');
        }
    }

    /**
     * @throws InvalidArgumentException if the IV size is invalid
     */
    private function checkIvSize(?string $iv, int $requiredIvSize): void
    {
        if (null === $iv && 0 !== $requiredIvSize) {
            throw new InvalidArgumentException('Invalid IV size');
        }
        if (\is_string($iv) && mb_strlen($iv, '8bit') !== $requiredIvSize / 8) {
            throw new InvalidArgumentException('Invalid IV size');
        }
    }

    /**
     * @throws InvalidArgumentException if the CEK creation method is not supported
     */
    private function decryptCEK(Algorithm $key_encryption_algorithm, ContentEncryptionAlgorithm $content_encryption_algorithm, JWK $recipientKey, ?JWK $senderKey, Recipient $recipient, array $completeHeader): ?string
    {
        if ($key_encryption_algorithm instanceof DirectEncryption) {
            return $key_encryption_algorithm->getCEK($recipientKey);
        }
        if ($key_encryption_algorithm instanceof KeyAgreement) {
            return $key_encryption_algorithm->getAgreementKey($content_encryption_algorithm->getCEKSize(), $content_encryption_algorithm->name(), $recipientKey, $senderKey, $completeHeader);
        }
        if ($key_encryption_algorithm instanceof KeyAgreementWithKeyWrapping) {
            return $key_encryption_algorithm->unwrapAgreementKey($recipientKey, $senderKey, $recipient->getEncryptedKey(), $content_encryption_algorithm->getCEKSize(), $completeHeader);
        }
        if ($key_encryption_algorithm instanceof KeyEncryption) {
            return $key_encryption_algorithm->decryptKey($recipientKey, $recipient->getEncryptedKey(), $completeHeader);
        }
        if ($key_encryption_algorithm instanceof KeyWrapping) {
            return $key_encryption_algorithm->unwrapKey($recipientKey, $recipient->getEncryptedKey(), $completeHeader);
        }

        throw new InvalidArgumentException('Unsupported CEK generation');
    }

    private function decryptPayload(JWE $jwe, string $cek, ContentEncryptionAlgorithm $content_encryption_algorithm, array $completeHeader): string
    {
        $payload = $content_encryption_algorithm->decryptContent($jwe->getCiphertext(), $cek, $jwe->getIV(), $jwe->getAAD(), $jwe->getEncodedSharedProtectedHeader(), $jwe->getTag());

        return $this->decompressIfNeeded($payload, $completeHeader);
    }

    private function decompressIfNeeded(string $payload, array $completeHeaders): string
    {
        if (\array_key_exists('zip', $completeHeaders)) {
            $compression_method = $this->compressionMethodManager->get($completeHeaders['zip']);
            $payload = $compression_method->uncompress($payload);
        }

        return $payload;
    }

    /**
     * @throws InvalidArgumentException if a header parameter is missing
     */
    private function checkCompleteHeader(array $completeHeaders): void
    {
        foreach (['enc', 'alg'] as $key) {
            if (!isset($completeHeaders[$key])) {
                throw new InvalidArgumentException(sprintf("Parameter '%s' is missing.", $key));
            }
        }
    }

    /**
     * @throws InvalidArgumentException if the key encryption algorithm is not supported or does not implement the KeyEncryptionAlgorithm interface
     */
    private function getKeyEncryptionAlgorithm(array $completeHeaders): KeyEncryptionAlgorithm
    {
        $key_encryption_algorithm = $this->keyEncryptionAlgorithmManager->get($completeHeaders['alg']);
        if (!$key_encryption_algorithm instanceof KeyEncryptionAlgorithm) {
            throw new InvalidArgumentException(sprintf('The key encryption algorithm "%s" is not supported or does not implement KeyEncryptionAlgorithm interface.', $completeHeaders['alg']));
        }

        return $key_encryption_algorithm;
    }

    /**
     * @throws InvalidArgumentException if the content encryption algorithm is not supported or does not implement the ContentEncryption interface
     */
    private function getContentEncryptionAlgorithm(array $completeHeader): ContentEncryptionAlgorithm
    {
        $content_encryption_algorithm = $this->contentEncryptionAlgorithmManager->get($completeHeader['enc']);
        if (!$content_encryption_algorithm instanceof ContentEncryptionAlgorithm) {
            throw new InvalidArgumentException(sprintf('The key encryption algorithm "%s" is not supported or does not implement the ContentEncryption interface.', $completeHeader['enc']));
        }

        return $content_encryption_algorithm;
    }
}


1			<?php
2
3			declare(strict_types=1);
4
5			/*
6			* The MIT License (MIT)
7			*
8			* Copyright (c) 2014-2019 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 InvalidArgumentException;
17			use Jose\Component\Core\Algorithm;
18			use Jose\Component\Core\AlgorithmManager;
19			use Jose\Component\Core\JWK;
20			use Jose\Component\Core\JWKSet;
21			use Jose\Component\Core\Util\KeyChecker;
22			use Jose\Component\Encryption\Algorithm\ContentEncryptionAlgorithm;
23			use Jose\Component\Encryption\Algorithm\KeyEncryption\DirectEncryption;
24			use Jose\Component\Encryption\Algorithm\KeyEncryption\KeyAgreement;
25			use Jose\Component\Encryption\Algorithm\KeyEncryption\KeyAgreementWithKeyWrapping;
26			use Jose\Component\Encryption\Algorithm\KeyEncryption\KeyEncryption;
27			use Jose\Component\Encryption\Algorithm\KeyEncryption\KeyWrapping;
28			use Jose\Component\Encryption\Algorithm\KeyEncryptionAlgorithm;
29			use Jose\Component\Encryption\Compression\CompressionMethodManager;
30			use Throwable;
31
32			class JWEDecrypter
33			{
34			/**
35			* @var AlgorithmManager
36			*/
37			private $keyEncryptionAlgorithmManager;
38
39			/**
40			* @var AlgorithmManager
41			*/
42			private $contentEncryptionAlgorithmManager;
43
44			/**
45			* @var CompressionMethodManager
46			*/
47			private $compressionMethodManager;
48
49			public function __construct(AlgorithmManager $keyEncryptionAlgorithmManager, AlgorithmManager $contentEncryptionAlgorithmManager, CompressionMethodManager $compressionMethodManager)
50			{
51			$this->keyEncryptionAlgorithmManager = $keyEncryptionAlgorithmManager;
52			$this->contentEncryptionAlgorithmManager = $contentEncryptionAlgorithmManager;
53			$this->compressionMethodManager = $compressionMethodManager;
54			}
55
56			/**
57			* Returns the key encryption algorithm manager.
58			*/
59			public function getKeyEncryptionAlgorithmManager(): AlgorithmManager
60			{
61			return $this->keyEncryptionAlgorithmManager;
62			}
63
64			/**
65			* Returns the content encryption algorithm manager.
66			*/
67			public function getContentEncryptionAlgorithmManager(): AlgorithmManager
68			{
69			return $this->contentEncryptionAlgorithmManager;
70			}
71
72			/**
73			* Returns the compression method manager.
74			*/
75			public function getCompressionMethodManager(): CompressionMethodManager
76			{
77			return $this->compressionMethodManager;
78			}
79
80			/**
81			* This method will try to decrypt the given JWE and recipient using a JWK.
82			*
83			* @param JWE $jwe A JWE object to decrypt
84			* @param JWK $jwk The key used to decrypt the input
85			* @param int $recipient The recipient used to decrypt the token
86			*/
87			public function decryptUsingKey(JWE &$jwe, JWK $jwk, int $recipient, ?JWK $senderKey = null): bool
88			{
89			$jwkset = new JWKSet([$jwk]);
90
91			return $this->decryptUsingKeySet($jwe, $jwkset, $recipient, $senderKey);
92			}
93
94			/**
95			* This method will try to decrypt the given JWE and recipient using a JWKSet.
96			*
97			* @param JWE $jwe A JWE object to decrypt
98			* @param JWKSet $jwkset The key set used to decrypt the input
99			* @param JWK $jwk The key used to decrypt the token in case of success
100			* @param int $recipient The recipient used to decrypt the token in case of success
101			*
102			* @throws InvalidArgumentException if no key is set is the keyset
103			* @throws InvalidArgumentException if the token has no recipients
104			*/
105			public function decryptUsingKeySet(JWE &$jwe, JWKSet $jwkset, int $recipient, JWK &$jwk = null, ?JWK $senderKey = null): bool
106			{
107			if (0 === $jwkset->count()) {
108			throw new InvalidArgumentException('No key in the key set.');
109			}
110			if (null !== $jwe->getPayload()) {
111			return true;
112			}
113			if (0 === $jwe->countRecipients()) {
114			throw new InvalidArgumentException('The JWE does not contain any recipient.');
115			}
116
117			$plaintext = $this->decryptRecipientKey($jwe, $jwkset, $recipient, $jwk, $senderKey);
118			if (null !== $plaintext) {
119			$jwe = $jwe->withPayload($plaintext);
120
121			return true;
122			}
123
124			return false;
125			}
126
127			private function decryptRecipientKey(JWE $jwe, JWKSet $jwkset, int $i, JWK &$successJwk = null, ?JWK $senderKey = null): ?string
128			{
129			$recipient = $jwe->getRecipient($i);
130			$completeHeader = array_merge($jwe->getSharedProtectedHeader(), $jwe->getSharedHeader(), $recipient->getHeader());
131			$this->checkCompleteHeader($completeHeader);
132
133			$key_encryption_algorithm = $this->getKeyEncryptionAlgorithm($completeHeader);
134			$content_encryption_algorithm = $this->getContentEncryptionAlgorithm($completeHeader);
135
136			$this->checkIvSize($jwe->getIV(), $content_encryption_algorithm->getIVSize());
137
138			foreach ($jwkset as $recipientKey) {
139			try {
140			KeyChecker::checkKeyUsage($recipientKey, 'decryption');
141			if ('dir' !== $key_encryption_algorithm->name()) {
142			KeyChecker::checkKeyAlgorithm($recipientKey, $key_encryption_algorithm->name());
143			} else {
144			KeyChecker::checkKeyAlgorithm($recipientKey, $content_encryption_algorithm->name());
145			}
146			$cek = $this->decryptCEK($key_encryption_algorithm, $content_encryption_algorithm, $recipientKey, $senderKey, $recipient, $completeHeader);
147			if (null !== $cek) {
148			$this->checkCekSize($cek, $key_encryption_algorithm, $content_encryption_algorithm);
149			$payload = $this->decryptPayload($jwe, $cek, $content_encryption_algorithm, $completeHeader);
150			$successJwk = $recipientKey;
151
152			return $payload;
153			}
154			} catch (Throwable $e) {
155			//We do nothing, we continue with other keys
156			continue;
157			}
158			}
159
160			return null;
161			}
162
163			/**
164			* @throws InvalidArgumentException if the Content Encryption Key size is invalid
165			*/
166			private function checkCekSize(string $cek, KeyEncryptionAlgorithm $keyEncryptionAlgorithm, ContentEncryptionAlgorithm $algorithm): void
167			{
168			if ($keyEncryptionAlgorithm instanceof DirectEncryption \|\| $keyEncryptionAlgorithm instanceof KeyAgreement) {
169			return;
170			}
171			if (mb_strlen($cek, '8bit') * 8 !== $algorithm->getCEKSize()) {
172			throw new InvalidArgumentException('Invalid CEK size');
173			}
174			}
175
176			/**
177			* @throws InvalidArgumentException if the IV size is invalid
178			*/
179			private function checkIvSize(?string $iv, int $requiredIvSize): void
180			{
181			if (null === $iv && 0 !== $requiredIvSize) {
182			throw new InvalidArgumentException('Invalid IV size');
183			}
184			if (\is_string($iv) && mb_strlen($iv, '8bit') !== $requiredIvSize / 8) {
185			throw new InvalidArgumentException('Invalid IV size');
186			}
187			}
188
189			/**
190			* @throws InvalidArgumentException if the CEK creation method is not supported
191			*/
192			private function decryptCEK(Algorithm $key_encryption_algorithm, ContentEncryptionAlgorithm $content_encryption_algorithm, JWK $recipientKey, ?JWK $senderKey, Recipient $recipient, array $completeHeader): ?string
193			{
194			if ($key_encryption_algorithm instanceof DirectEncryption) {
195			return $key_encryption_algorithm->getCEK($recipientKey);
196			}
197			if ($key_encryption_algorithm instanceof KeyAgreement) {
198			return $key_encryption_algorithm->getAgreementKey($content_encryption_algorithm->getCEKSize(), $content_encryption_algorithm->name(), $recipientKey, $senderKey, $completeHeader);
199			}
200			if ($key_encryption_algorithm instanceof KeyAgreementWithKeyWrapping) {
201			return $key_encryption_algorithm->unwrapAgreementKey($recipientKey, $senderKey, $recipient->getEncryptedKey(), $content_encryption_algorithm->getCEKSize(), $completeHeader);
202			}
203			if ($key_encryption_algorithm instanceof KeyEncryption) {
204			return $key_encryption_algorithm->decryptKey($recipientKey, $recipient->getEncryptedKey(), $completeHeader);
205			}
206			if ($key_encryption_algorithm instanceof KeyWrapping) {
207			return $key_encryption_algorithm->unwrapKey($recipientKey, $recipient->getEncryptedKey(), $completeHeader);
208			}
209
210			throw new InvalidArgumentException('Unsupported CEK generation');
211			}
212
213			private function decryptPayload(JWE $jwe, string $cek, ContentEncryptionAlgorithm $content_encryption_algorithm, array $completeHeader): string
214			{
215			$payload = $content_encryption_algorithm->decryptContent($jwe->getCiphertext(), $cek, $jwe->getIV(), $jwe->getAAD(), $jwe->getEncodedSharedProtectedHeader(), $jwe->getTag());
216
217			return $this->decompressIfNeeded($payload, $completeHeader);
218			}
219
220			private function decompressIfNeeded(string $payload, array $completeHeaders): string
221			{
222			if (\array_key_exists('zip', $completeHeaders)) {
223			$compression_method = $this->compressionMethodManager->get($completeHeaders['zip']);
224			$payload = $compression_method->uncompress($payload);
225			}
226
227			return $payload;
228			}
229
230			/**
231			* @throws InvalidArgumentException if a header parameter is missing
232			*/
233			private function checkCompleteHeader(array $completeHeaders): void
234			{
235			foreach (['enc', 'alg'] as $key) {
236			if (!isset($completeHeaders[$key])) {
237			throw new InvalidArgumentException(sprintf("Parameter '%s' is missing.", $key));
238			}
239			}
240			}
241
242			/**
243			* @throws InvalidArgumentException if the key encryption algorithm is not supported or does not implement the KeyEncryptionAlgorithm interface
244			*/
245			private function getKeyEncryptionAlgorithm(array $completeHeaders): KeyEncryptionAlgorithm
246			{
247			$key_encryption_algorithm = $this->keyEncryptionAlgorithmManager->get($completeHeaders['alg']);
248			if (!$key_encryption_algorithm instanceof KeyEncryptionAlgorithm) {
249			throw new InvalidArgumentException(sprintf('The key encryption algorithm "%s" is not supported or does not implement KeyEncryptionAlgorithm interface.', $completeHeaders['alg']));
250			}
251
252			return $key_encryption_algorithm;
253			}
254
255			/**
256			* @throws InvalidArgumentException if the content encryption algorithm is not supported or does not implement the ContentEncryption interface
257			*/
258			private function getContentEncryptionAlgorithm(array $completeHeader): ContentEncryptionAlgorithm
259			{
260			$content_encryption_algorithm = $this->contentEncryptionAlgorithmManager->get($completeHeader['enc']);
261			if (!$content_encryption_algorithm instanceof ContentEncryptionAlgorithm) {
262			throw new InvalidArgumentException(sprintf('The key encryption algorithm "%s" is not supported or does not implement the ContentEncryption interface.', $completeHeader['enc']));
263			}
264
265			return $content_encryption_algorithm;
266			}
267			}
268

web-token / jwt-framework

JWEDecrypter::decryptCEK() B last analyzed 2019-10-31 23:09 UTC

Complexity

Size

Duplication

Importance

Duplication Side-by-Side

Filter issues like

JWEDecrypter::decryptCEK() B
last analyzed 2019-10-31 23:09 UTC