79 lines
2.6 KiB
PHP
79 lines
2.6 KiB
PHP
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<?php
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namespace DeliciousBrains\WP_Offload_Media\Aws3\Aws\Crypto;
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use DeliciousBrains\WP_Offload_Media\Aws3\Aws\Exception\CryptoException;
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use DeliciousBrains\WP_Offload_Media\Aws3\GuzzleHttp\Psr7;
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use DeliciousBrains\WP_Offload_Media\Aws3\GuzzleHttp\Psr7\StreamDecoratorTrait;
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use DeliciousBrains\WP_Offload_Media\Aws3\Psr\Http\Message\StreamInterface;
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use DeliciousBrains\WP_Offload_Media\Aws3\Aws\Crypto\Polyfill\AesGcm;
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use DeliciousBrains\WP_Offload_Media\Aws3\Aws\Crypto\Polyfill\Key;
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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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if (\version_compare(\PHP_VERSION, '7.1', '<')) {
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return Psr7\Utils::streamFor(AesGcm::decrypt((string) $this->cipherText, $this->initializationVector, new Key($this->key), $this->aad, $this->tag, $this->keySize));
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} else {
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$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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}
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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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