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<?php |
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namespace Dudlewebs\WPMCS\s3\Aws\Crypto; |
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use Dudlewebs\WPMCS\s3\Aws\Crypto\Polyfill\AesGcm; |
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use Dudlewebs\WPMCS\s3\Aws\Crypto\Polyfill\Key; |
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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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use RuntimeException; |
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/** |
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* @internal Represents a stream of data to be gcm encrypted. |
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*/ |
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class AesGcmEncryptingStream implements AesStreamInterface, AesStreamInterfaceV2 |
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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 $plaintext; |
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private $tag = ''; |
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private $tagLength; |
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/** |
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* Same as non-static 'getAesName' method, allowing calls in a static |
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* context. |
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* |
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* @return string |
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*/ |
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public static function getStaticAesName() |
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{ |
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return 'AES/GCM/NoPadding'; |
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} |
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/** |
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* @param StreamInterface $plaintext |
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* @param string $key |
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* @param string $initializationVector |
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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 $plaintext, $key, $initializationVector, $aad = '', $tagLength = 16, $keySize = 256) |
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{ |
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$this->plaintext = $plaintext; |
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$this->key = $key; |
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$this->initializationVector = $initializationVector; |
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$this->aad = $aad; |
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$this->tagLength = $tagLength; |
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$this->keySize = $keySize; |
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} |
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public function getOpenSslName() |
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{ |
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return "aes-{$this->keySize}-gcm"; |
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} |
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/** |
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* Same as static method and retained for backwards compatibility |
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* |
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* @return string |
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*/ |
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public function getAesName() |
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{ |
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return self::getStaticAesName(); |
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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::encrypt((string) $this->plaintext, $this->initializationVector, new Key($this->key), $this->aad, $this->tag, $this->keySize)); |
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} else { |
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return Psr7\Utils::streamFor(\openssl_encrypt((string) $this->plaintext, $this->getOpenSslName(), $this->key, \OPENSSL_RAW_DATA, $this->initializationVector, $this->tag, $this->aad, $this->tagLength)); |
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} |
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} |
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/** |
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* @return string |
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*/ |
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public function getTag() |
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{ |
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return $this->tag; |
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} |
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public function isWritable() |
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{ |
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return \false; |
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} |
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} |
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