Decrypter::__construct() - Code Metrics - Inspection of "Bugs fixed and PSR-3 introduced" - Spomky-Labs/jose - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( 0f6cd0...ce5be5 )

by Florent

created 2016-02-25 12:48 UTC

Decrypter::__construct() A

↳ Parent: Decrypter

Complexity

Conditions	2
Paths	2

Size

Total Lines	12
Code Lines	8

Duplication

Lines	0
Ratio	0 %

Importance

Changes	6
Bugs	2	Features	0

Metric	Value
c	6
b	2
f	0
dl	0
loc	12
rs	9.4285
cc	2
eloc	8
nc	2
nop	3

<?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 Jose\Algorithm\ContentEncryptionAlgorithmInterface;
use Jose\Algorithm\JWAInterface;
use Jose\Algorithm\JWAManagerInterface;
use Jose\Algorithm\KeyEncryption\DirectEncryptionInterface;
use Jose\Algorithm\KeyEncryption\KeyAgreementInterface;
use Jose\Algorithm\KeyEncryption\KeyAgreementWrappingInterface;
use Jose\Algorithm\KeyEncryption\KeyEncryptionInterface;
use Jose\Algorithm\KeyEncryption\KeyWrappingInterface;
use Jose\Algorithm\KeyEncryptionAlgorithmInterface;
use Jose\Behaviour\HasCompressionManager;
use Jose\Behaviour\HasJWAManager;
use Jose\Behaviour\HasKeyChecker;
use Jose\Behaviour\HasLogger;
use Jose\Compression\CompressionManagerInterface;
use Jose\Object\JWEInterface;
use Jose\Object\JWKInterface;
use Jose\Object\JWKSet;
use Jose\Object\JWKSetInterface;
use Jose\Object\RecipientInterface;
use Psr\Log\LoggerInterface;
use Psr\Log\LogLevel;

/**
 */
final class Decrypter implements DecrypterInterface
{
    use HasKeyChecker;
    use HasJWAManager;
    use HasCompressionManager;
    use HasLogger;

    /**
     * Decrypter constructor.
     *
     * @param \Jose\Algorithm\JWAManagerInterface           $jwa_manager
     * @param \Jose\Compression\CompressionManagerInterface $compression_manager
     * @param \Psr\Log\LoggerInterface|null                 $logger
     */
    public function __construct(
        JWAManagerInterface $jwa_manager,
        CompressionManagerInterface $compression_manager,
        LoggerInterface $logger = null
    ) {
        $this->setJWAManager($jwa_manager);
        $this->setCompressionManager($compression_manager);

        if (null !== $logger) {
            $this->setLogger($logger);
        }
    }

    /**
     * {@inheritdoc}
     */
    public function decryptUsingKey(JWEInterface &$jwe, JWKInterface $jwk)
    {
        $jwk_set = new JWKSet();
        $jwk_set = $jwk_set->addKey($jwk);

        return $this->decryptUsingKeySet($jwe, $jwk_set);
    }

    /**
     * {@inheritdoc}
     */
    public function decryptUsingKeySet(JWEInterface &$jwe, JWKSetInterface $jwk_set)
    {
        $this->log(LogLevel::DEBUG, 'Trying to decrypt the JWE.');
        $this->checkJWKSet($jwk_set);
        $this->checkPayload($jwe);
        $this->checkRecipients($jwe);

        $nb_recipients = $jwe->countRecipients();
        $this->log(LogLevel::DEBUG, 'The JWE contains {nb} recipient(s).', ['nb' => $nb_recipients]);

        for ($i = 0; $i < $nb_recipients; $i++) {
            $this->log(LogLevel::DEBUG, 'Trying to decrypt the encrypted key of recipient #{nb}.', ['nb' => $i]);
            $recipient = $jwe->getRecipient($i);
            $complete_headers = array_merge(
                $jwe->getSharedProtectedHeaders(),
                $jwe->getSharedHeaders(),
                $recipient->getHeaders()
            );
            $this->checkCompleteHeader($complete_headers);

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

            foreach ($jwk_set as $jwk) {
                try {
                    $this->checkKeyUsage($jwk, 'decryption');
                    if ('dir' !== $key_encryption_algorithm->getAlgorithmName()) {
                        $this->checkKeyAlgorithm($jwk, $key_encryption_algorithm->getAlgorithmName());
                    } else {
                        $this->checkKeyAlgorithm($jwk, $content_encryption_algorithm->getAlgorithmName());
                    }
                    $cek = $this->decryptCEK($key_encryption_algorithm, $content_encryption_algorithm, $jwk, $recipient, $complete_headers);
                    if (null !== $cek) {
                        if (true === $this->decryptPayload($jwe, $cek, $content_encryption_algorithm, $complete_headers)) {
                            return $i;
                        };
                    }
                } catch (\Exception $e) {
                    //We do nothing, we continue with other keys
                    continue;
                }
            }
        }

        throw new \InvalidArgumentException('Unable to decrypt the JWE. Please verify the key or keyset used is correct');
    }

    /**
     * @param \Jose\Object\JWEInterface $jwe
     */
    private function checkRecipients(JWEInterface $jwe)
    {
        if (0 === $jwe->countRecipients()) {
            throw new \InvalidArgumentException('The JWE does not contain any recipient.');
        }
    }

    /**
     * @param \Jose\Object\JWEInterface $jwe
     */
    private function checkPayload(JWEInterface $jwe)
    {
        $this->log(LogLevel::DEBUG, 'Checking the payload.', ['payload' => $jwe->getPayload()]);
        if (null !== $jwe->getPayload()) {
            $exception = new \InvalidArgumentException('The JWE is already decrypted.');
            $this->log(LogLevel::ERROR, 'The JWE is already decrypted.', ['exception' => $exception]);
            throw $exception;
        }
    }

    /**
     * @param \Jose\Object\JWKSetInterface $jwk_set
     */
    private function checkJWKSet(JWKSetInterface $jwk_set)
    {
        $this->log(LogLevel::DEBUG, 'Checking the key set.', ['jwkset' => $jwk_set]);
        if (0 === count($jwk_set)) {
            $exception = new \InvalidArgumentException('No key in the key set.');
            $this->log(LogLevel::ERROR, 'There is no key in the key set.', ['exception' => $exception]);
            throw $exception;
        }
        $this->log(LogLevel::DEBUG, 'Checking the key set.', ['jwkset' => $jwk_set]);
    }

    /**
     * @param \Jose\Algorithm\JWAInterface                        $key_encryption_algorithm
     * @param \Jose\Algorithm\ContentEncryptionAlgorithmInterface $content_encryption_algorithm
     * @param \Jose\Object\JWKInterface                           $key
     * @param \Jose\Object\RecipientInterface                     $recipient
     * @param array                                               $complete_headers
     *
     * @return null|string
     */
    private function decryptCEK(JWAInterface $key_encryption_algorithm, ContentEncryptionAlgorithmInterface $content_encryption_algorithm, JWKInterface $key, RecipientInterface $recipient, array $complete_headers)
    {
        if ($key_encryption_algorithm instanceof DirectEncryptionInterface) {
            return $key_encryption_algorithm->getCEK($key);
        } elseif ($key_encryption_algorithm instanceof KeyAgreementInterface) {
            return $key_encryption_algorithm->getAgreementKey(
                $content_encryption_algorithm->getCEKSize(),
                $content_encryption_algorithm->getAlgorithmName(),
                $key,
                null,
                $complete_headers
            );
        } elseif ($key_encryption_algorithm instanceof KeyAgreementWrappingInterface) {
            return $key_encryption_algorithm->unwrapAgreementKey(
                $key,
                $recipient->getEncryptedKey(),
                $content_encryption_algorithm->getCEKSize(),
                $complete_headers
            );
        } elseif ($key_encryption_algorithm instanceof KeyEncryptionInterface) {
            return $key_encryption_algorithm->decryptKey(
                $key,
                $recipient->getEncryptedKey(),
                $complete_headers
            );
        } elseif ($key_encryption_algorithm instanceof KeyWrappingInterface) {
            return $key_encryption_algorithm->unwrapKey(
                $key,
                $recipient->getEncryptedKey(),
                $complete_headers
            );
        } else {
            throw new \InvalidArgumentException('Unsupported CEK generation');
        }
    }

    /**
     * @param \Jose\Object\JWEInterface                           $jwe
     * @param string                                              $cek
     * @param \Jose\Algorithm\ContentEncryptionAlgorithmInterface $content_encryption_algorithm
     * @param array                                               $complete_headers
     *
     * @return bool
     */
    private function decryptPayload(JWEInterface &$jwe, $cek, ContentEncryptionAlgorithmInterface $content_encryption_algorithm, array $complete_headers)
    {
        $payload = $content_encryption_algorithm->decryptContent(
            $jwe->getCiphertext(),
            $cek,
            $jwe->getIV(),
            $jwe->getAAD(),
            $jwe->getEncodedSharedProtectedHeaders(),
            $jwe->getTag()
        );
        if (null === $payload) {
            return false;
        }

        $jwe = $jwe->withContentEncryptionKey($cek);

        $this->decompressIfNeeded($payload, $complete_headers);

        $decoded = json_decode($payload, true);
        $jwe = $jwe->withPayload(null === $decoded ? $payload : $decoded);

        return true;
    }

    /**
     * @param string $payload
     * @param array  $complete_headers
     */
    private function decompressIfNeeded(&$payload, array $complete_headers)
    {
        $this->log(LogLevel::DEBUG, 'Checking if payload is compressed.', ['payload' => $payload]);
        if (array_key_exists('zip', $complete_headers)) {
            $this->log(LogLevel::DEBUG, 'Header indicates the payload is compressed with method {compress}.', ['compress' => $complete_headers['zip']]);
            $compression_method = $this->getCompressionMethod($complete_headers['zip']);
            $payload = $compression_method->uncompress($payload);
            if (!is_string($payload)) {
                $exception = new \InvalidArgumentException('Decompression failed');
                $this->log(LogLevel::ERROR, 'Unable to decompress the payload.', ['exception' => $exception]);
                throw $exception;
            }
        }
    }

    /**
     * @param array $complete_headers
     *
     * @throws \InvalidArgumentException
     */
    private function checkCompleteHeader(array $complete_headers)
    {
        $this->log(LogLevel::DEBUG, 'Checking for mandatory parameters.');
        foreach (['enc', 'alg'] as $key) {
            if (!array_key_exists($key, $complete_headers)) {
                $exception = new \InvalidArgumentException(sprintf("Parameters '%s' is missing.", $key));
                $this->log(LogLevel::ERROR, 'Parameter is missing.', ['exception' => $exception]);
                throw $exception;
            }
        }
    }

    /**
     * @param array $complete_headers
     *
     * @return \Jose\Algorithm\KeyEncryptionAlgorithmInterface
     */
    private function getKeyEncryptionAlgorithm(array $complete_headers)
    {
        $key_encryption_algorithm = $this->getJWAManager()->getAlgorithm($complete_headers['alg']);

        if (!$key_encryption_algorithm instanceof KeyEncryptionAlgorithmInterface) {
            throw new \InvalidArgumentException(sprintf("The key encryption algorithm '%s' is not supported or does not implement KeyEncryptionAlgorithmInterface.", $complete_headers['alg']));
        }

        return $key_encryption_algorithm;
    }

    /**
     * @param array $complete_headers
     *
     * @return \Jose\Algorithm\ContentEncryptionAlgorithmInterface
     */
    private function getContentEncryptionAlgorithm(array $complete_headers)
    {
        $content_encryption_algorithm = $this->getJWAManager()->getAlgorithm($complete_headers['enc']);
        if (!$content_encryption_algorithm instanceof ContentEncryptionAlgorithmInterface) {
            throw new \InvalidArgumentException(sprintf('The algorithm "%s" does not exist or does not implement ContentEncryptionInterface."', $complete_headers['enc']));
        }

        return $content_encryption_algorithm;
    }

    /**
     * @param string $method
     *
     * @throws \InvalidArgumentException
     *
     * @return \Jose\Compression\CompressionInterface
     */
    private function getCompressionMethod($method)
    {
        $compression_method = $this->getCompressionManager()->getCompressionAlgorithm($method);
        if (null === $compression_method) {
            throw new \InvalidArgumentException(sprintf("Compression method '%s' not supported"), $method);
        }

        return $compression_method;
    }
}


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 Jose\Algorithm\ContentEncryptionAlgorithmInterface;
15			use Jose\Algorithm\JWAInterface;
16			use Jose\Algorithm\JWAManagerInterface;
17			use Jose\Algorithm\KeyEncryption\DirectEncryptionInterface;
18			use Jose\Algorithm\KeyEncryption\KeyAgreementInterface;
19			use Jose\Algorithm\KeyEncryption\KeyAgreementWrappingInterface;
20			use Jose\Algorithm\KeyEncryption\KeyEncryptionInterface;
21			use Jose\Algorithm\KeyEncryption\KeyWrappingInterface;
22			use Jose\Algorithm\KeyEncryptionAlgorithmInterface;
23			use Jose\Behaviour\HasCompressionManager;
24			use Jose\Behaviour\HasJWAManager;
25			use Jose\Behaviour\HasKeyChecker;
26			use Jose\Behaviour\HasLogger;
27			use Jose\Compression\CompressionManagerInterface;
28			use Jose\Object\JWEInterface;
29			use Jose\Object\JWKInterface;
30			use Jose\Object\JWKSet;
31			use Jose\Object\JWKSetInterface;
32			use Jose\Object\RecipientInterface;
33			use Psr\Log\LoggerInterface;
34			use Psr\Log\LogLevel;
35
36			/**
37			*/
38			final class Decrypter implements DecrypterInterface
39			{
40			use HasKeyChecker;
41			use HasJWAManager;
42			use HasCompressionManager;
43			use HasLogger;
44
45			/**
46			* Decrypter constructor.
47			*
48			* @param \Jose\Algorithm\JWAManagerInterface $jwa_manager
49			* @param \Jose\Compression\CompressionManagerInterface $compression_manager
50			* @param \Psr\Log\LoggerInterface\|null $logger
51			*/
52			public function __construct(
53			JWAManagerInterface $jwa_manager,
54			CompressionManagerInterface $compression_manager,
55			LoggerInterface $logger = null
56			) {
57			$this->setJWAManager($jwa_manager);
58			$this->setCompressionManager($compression_manager);
59
60			if (null !== $logger) {
61			$this->setLogger($logger);
62			}
63			}
64
65			/**
66			* {@inheritdoc}
67			*/
68			public function decryptUsingKey(JWEInterface &$jwe, JWKInterface $jwk)
69			{
70			$jwk_set = new JWKSet();
71			$jwk_set = $jwk_set->addKey($jwk);
72
73			return $this->decryptUsingKeySet($jwe, $jwk_set);
74			}
75
76			/**
77			* {@inheritdoc}
78			*/
79			public function decryptUsingKeySet(JWEInterface &$jwe, JWKSetInterface $jwk_set)
80			{
81			$this->log(LogLevel::DEBUG, 'Trying to decrypt the JWE.');
82			$this->checkJWKSet($jwk_set);
83			$this->checkPayload($jwe);
84			$this->checkRecipients($jwe);
85
86			$nb_recipients = $jwe->countRecipients();
87			$this->log(LogLevel::DEBUG, 'The JWE contains {nb} recipient(s).', ['nb' => $nb_recipients]);
88
89			for ($i = 0; $i < $nb_recipients; $i++) {
90			$this->log(LogLevel::DEBUG, 'Trying to decrypt the encrypted key of recipient #{nb}.', ['nb' => $i]);
91			$recipient = $jwe->getRecipient($i);
92			$complete_headers = array_merge(
93			$jwe->getSharedProtectedHeaders(),
94			$jwe->getSharedHeaders(),
95			$recipient->getHeaders()
96			);
97			$this->checkCompleteHeader($complete_headers);
98
99			$key_encryption_algorithm = $this->getKeyEncryptionAlgorithm($complete_headers);
100			$content_encryption_algorithm = $this->getContentEncryptionAlgorithm($complete_headers);
101
102			foreach ($jwk_set as $jwk) {
103			try {
104			$this->checkKeyUsage($jwk, 'decryption');
105			if ('dir' !== $key_encryption_algorithm->getAlgorithmName()) {
106			$this->checkKeyAlgorithm($jwk, $key_encryption_algorithm->getAlgorithmName());
107			} else {
108			$this->checkKeyAlgorithm($jwk, $content_encryption_algorithm->getAlgorithmName());
109			}
110			$cek = $this->decryptCEK($key_encryption_algorithm, $content_encryption_algorithm, $jwk, $recipient, $complete_headers);
111			if (null !== $cek) {
112			if (true === $this->decryptPayload($jwe, $cek, $content_encryption_algorithm, $complete_headers)) {
113			return $i;
114			};
115			}
116			} catch (\Exception $e) {
117			//We do nothing, we continue with other keys
118			continue;
119			}
120			}
121			}
122
123			throw new \InvalidArgumentException('Unable to decrypt the JWE. Please verify the key or keyset used is correct');
124			}
125
126			/**
127			* @param \Jose\Object\JWEInterface $jwe
128			*/
129			private function checkRecipients(JWEInterface $jwe)
130			{
131			if (0 === $jwe->countRecipients()) {
132			throw new \InvalidArgumentException('The JWE does not contain any recipient.');
133			}
134			}
135
136			/**
137			* @param \Jose\Object\JWEInterface $jwe
138			*/
139			private function checkPayload(JWEInterface $jwe)
140			{
141			$this->log(LogLevel::DEBUG, 'Checking the payload.', ['payload' => $jwe->getPayload()]);
142			if (null !== $jwe->getPayload()) {
143			$exception = new \InvalidArgumentException('The JWE is already decrypted.');
144			$this->log(LogLevel::ERROR, 'The JWE is already decrypted.', ['exception' => $exception]);
145			throw $exception;
146			}
147			}
148
149			/**
150			* @param \Jose\Object\JWKSetInterface $jwk_set
151			*/
152			private function checkJWKSet(JWKSetInterface $jwk_set)
153			{
154			$this->log(LogLevel::DEBUG, 'Checking the key set.', ['jwkset' => $jwk_set]);
155			if (0 === count($jwk_set)) {
156			$exception = new \InvalidArgumentException('No key in the key set.');
157			$this->log(LogLevel::ERROR, 'There is no key in the key set.', ['exception' => $exception]);
158			throw $exception;
159			}
160			$this->log(LogLevel::DEBUG, 'Checking the key set.', ['jwkset' => $jwk_set]);
161			}
162
163			/**
164			* @param \Jose\Algorithm\JWAInterface $key_encryption_algorithm
165			* @param \Jose\Algorithm\ContentEncryptionAlgorithmInterface $content_encryption_algorithm
166			* @param \Jose\Object\JWKInterface $key
167			* @param \Jose\Object\RecipientInterface $recipient
168			* @param array $complete_headers
169			*
170			* @return null\|string
171			*/
172			private function decryptCEK(JWAInterface $key_encryption_algorithm, ContentEncryptionAlgorithmInterface $content_encryption_algorithm, JWKInterface $key, RecipientInterface $recipient, array $complete_headers)
173			{
174			if ($key_encryption_algorithm instanceof DirectEncryptionInterface) {
175			return $key_encryption_algorithm->getCEK($key);
176			} elseif ($key_encryption_algorithm instanceof KeyAgreementInterface) {
177			return $key_encryption_algorithm->getAgreementKey(
178			$content_encryption_algorithm->getCEKSize(),
179			$content_encryption_algorithm->getAlgorithmName(),
180			$key,
181			null,
182			$complete_headers
183			);
184			} elseif ($key_encryption_algorithm instanceof KeyAgreementWrappingInterface) {
185			return $key_encryption_algorithm->unwrapAgreementKey(
186			$key,
187			$recipient->getEncryptedKey(),
188			$content_encryption_algorithm->getCEKSize(),
189			$complete_headers
190			);
191			} elseif ($key_encryption_algorithm instanceof KeyEncryptionInterface) {
192			return $key_encryption_algorithm->decryptKey(
193			$key,
194			$recipient->getEncryptedKey(),
195			$complete_headers
196			);
197			} elseif ($key_encryption_algorithm instanceof KeyWrappingInterface) {
198			return $key_encryption_algorithm->unwrapKey(
199			$key,
200			$recipient->getEncryptedKey(),
201			$complete_headers
202			);
203			} else {
204			throw new \InvalidArgumentException('Unsupported CEK generation');
205			}
206			}
207
208			/**
209			* @param \Jose\Object\JWEInterface $jwe
210			* @param string $cek
211			* @param \Jose\Algorithm\ContentEncryptionAlgorithmInterface $content_encryption_algorithm
212			* @param array $complete_headers
213			*
214			* @return bool
215			*/
216			private function decryptPayload(JWEInterface &$jwe, $cek, ContentEncryptionAlgorithmInterface $content_encryption_algorithm, array $complete_headers)
217			{
218			$payload = $content_encryption_algorithm->decryptContent(
219			$jwe->getCiphertext(),
220			$cek,
221			$jwe->getIV(),
222			$jwe->getAAD(),
223			$jwe->getEncodedSharedProtectedHeaders(),
224			$jwe->getTag()
225			);
226			if (null === $payload) {
227			return false;
228			}
229
230			$jwe = $jwe->withContentEncryptionKey($cek);
231
232			$this->decompressIfNeeded($payload, $complete_headers);
233
234			$decoded = json_decode($payload, true);
235			$jwe = $jwe->withPayload(null === $decoded ? $payload : $decoded);
236
237			return true;
238			}
239
240			/**
241			* @param string $payload
242			* @param array $complete_headers
243			*/
244			private function decompressIfNeeded(&$payload, array $complete_headers)
245			{
246			$this->log(LogLevel::DEBUG, 'Checking if payload is compressed.', ['payload' => $payload]);
247			if (array_key_exists('zip', $complete_headers)) {
248			$this->log(LogLevel::DEBUG, 'Header indicates the payload is compressed with method {compress}.', ['compress' => $complete_headers['zip']]);
249			$compression_method = $this->getCompressionMethod($complete_headers['zip']);
250			$payload = $compression_method->uncompress($payload);
251			if (!is_string($payload)) {
252			$exception = new \InvalidArgumentException('Decompression failed');
253			$this->log(LogLevel::ERROR, 'Unable to decompress the payload.', ['exception' => $exception]);
254			throw $exception;
255			}
256			}
257			}
258
259			/**
260			* @param array $complete_headers
261			*
262			* @throws \InvalidArgumentException
263			*/
264			private function checkCompleteHeader(array $complete_headers)
265			{
266			$this->log(LogLevel::DEBUG, 'Checking for mandatory parameters.');
267			foreach (['enc', 'alg'] as $key) {
268			if (!array_key_exists($key, $complete_headers)) {
269			$exception = new \InvalidArgumentException(sprintf("Parameters '%s' is missing.", $key));
270			$this->log(LogLevel::ERROR, 'Parameter is missing.', ['exception' => $exception]);
271			throw $exception;
272			}
273			}
274			}
275
276			/**
277			* @param array $complete_headers
278			*
279			* @return \Jose\Algorithm\KeyEncryptionAlgorithmInterface
280			*/
281			private function getKeyEncryptionAlgorithm(array $complete_headers)
282			{
283			$key_encryption_algorithm = $this->getJWAManager()->getAlgorithm($complete_headers['alg']);
284
285			if (!$key_encryption_algorithm instanceof KeyEncryptionAlgorithmInterface) {
286			throw new \InvalidArgumentException(sprintf("The key encryption algorithm '%s' is not supported or does not implement KeyEncryptionAlgorithmInterface.", $complete_headers['alg']));
287			}
288
289			return $key_encryption_algorithm;
290			}
291
292			/**
293			* @param array $complete_headers
294			*
295			* @return \Jose\Algorithm\ContentEncryptionAlgorithmInterface
296			*/
297			private function getContentEncryptionAlgorithm(array $complete_headers)
298			{
299			$content_encryption_algorithm = $this->getJWAManager()->getAlgorithm($complete_headers['enc']);
300			if (!$content_encryption_algorithm instanceof ContentEncryptionAlgorithmInterface) {
301			throw new \InvalidArgumentException(sprintf('The algorithm "%s" does not exist or does not implement ContentEncryptionInterface."', $complete_headers['enc']));
302			}
303
304			return $content_encryption_algorithm;
305			}
306
307			/**
308			* @param string $method
309			*
310			* @throws \InvalidArgumentException
311			*
312			* @return \Jose\Compression\CompressionInterface
313			*/
314			private function getCompressionMethod($method)
315			{
316			$compression_method = $this->getCompressionManager()->getCompressionAlgorithm($method);
317			if (null === $compression_method) {
318			throw new \InvalidArgumentException(sprintf("Compression method '%s' not supported"), $method);
319			}
320
321			return $compression_method;
322			}
323			}
324

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Decrypter::__construct() A

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