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<?php |
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namespace Dudlewebs\WPMCS\s3\Aws\Crypto; |
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|
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use Dudlewebs\WPMCS\s3\Aws\Exception\CryptoException; |
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use Dudlewebs\WPMCS\s3\GuzzleHttp\Psr7; |
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use Dudlewebs\WPMCS\s3\GuzzleHttp\Psr7\StreamDecoratorTrait; |
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use Dudlewebs\WPMCS\s3\Psr\Http\Message\StreamInterface; |
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/** |
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* @internal Represents a stream of data to be gcm decrypted. |
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*/ |
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class AesGcmDecryptingStream implements AesStreamInterface |
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{ |
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use StreamDecoratorTrait; |
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private $aad; |
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private $initializationVector; |
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private $key; |
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private $keySize; |
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private $cipherText; |
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private $tag; |
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private $tagLength; |
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/** |
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* @var StreamInterface |
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*/ |
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private $stream; |
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/** |
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* @param StreamInterface $cipherText |
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* @param string $key |
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* @param string $initializationVector |
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* @param string $tag |
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* @param string $aad |
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* @param int $tagLength |
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* @param int $keySize |
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*/ |
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public function __construct(StreamInterface $cipherText, $key, $initializationVector, $tag, $aad = '', $tagLength = 128, $keySize = 256) |
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{ |
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$this->cipherText = $cipherText; |
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$this->key = $key; |
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$this->initializationVector = $initializationVector; |
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$this->tag = $tag; |
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$this->aad = $aad; |
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$this->tagLength = $tagLength; |
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$this->keySize = $keySize; |
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// unsetting the property forces the first access to go through |
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// __get(). |
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unset($this->stream); |
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} |
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public function getOpenSslName() |
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{ |
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return "aes-{$this->keySize}-gcm"; |
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} |
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public function getAesName() |
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{ |
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return 'AES/GCM/NoPadding'; |
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} |
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public function getCurrentIv() |
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{ |
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return $this->initializationVector; |
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} |
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public function createStream() |
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{ |
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$result = \openssl_decrypt((string) $this->cipherText, $this->getOpenSslName(), $this->key, \OPENSSL_RAW_DATA, $this->initializationVector, $this->tag, $this->aad); |
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if ($result === \false) { |
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throw new CryptoException('The requested object could not be ' . 'decrypted due to an invalid authentication tag.'); |
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} |
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return Psr7\Utils::streamFor($result); |
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} |
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public function isWritable() : bool |
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{ |
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return \false; |
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} |
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} |
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