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Direktori : /home2/selectio/www/myclassicfit.com/vendor/aws/aws-sdk-php/src/Crypto/ |
Current File : /home2/selectio/www/myclassicfit.com/vendor/aws/aws-sdk-php/src/Crypto/AesDecryptingStream.php |
<?php namespace Aws\Crypto; use GuzzleHttp\Psr7\StreamDecoratorTrait; use \LogicException; use Psr\Http\Message\StreamInterface; use Aws\Crypto\Cipher\CipherMethod; /** * @internal Represents a stream of data to be decrypted with passed cipher. */ class AesDecryptingStream implements AesStreamInterface { const BLOCK_SIZE = 16; // 128 bits use StreamDecoratorTrait; /** * @var string */ private $buffer = ''; /** * @var CipherMethod */ private $cipherMethod; /** * @var string */ private $key; /** * @var StreamInterface */ private $stream; /** * @param StreamInterface $cipherText * @param string $key * @param CipherMethod $cipherMethod */ public function __construct( StreamInterface $cipherText, $key, CipherMethod $cipherMethod ) { $this->stream = $cipherText; $this->key = $key; $this->cipherMethod = clone $cipherMethod; } public function getOpenSslName() { return $this->cipherMethod->getOpenSslName(); } public function getAesName() { return $this->cipherMethod->getAesName(); } public function getCurrentIv() { return $this->cipherMethod->getCurrentIv(); } public function getSize() { $plainTextSize = $this->stream->getSize(); if ($this->cipherMethod->requiresPadding()) { // PKCS7 padding requires that between 1 and self::BLOCK_SIZE be // added to the plaintext to make it an even number of blocks. The // plaintext is between strlen($cipherText) - self::BLOCK_SIZE and // strlen($cipherText) - 1 return null; } return $plainTextSize; } public function isWritable() { return false; } public function read($length) { if ($length > strlen($this->buffer)) { $this->buffer .= $this->decryptBlock( (int) ( self::BLOCK_SIZE * ceil(($length - strlen($this->buffer)) / self::BLOCK_SIZE) ) ); } $data = substr($this->buffer, 0, $length); $this->buffer = substr($this->buffer, $length); return $data ? $data : ''; } public function seek($offset, $whence = SEEK_SET) { if ($offset === 0 && $whence === SEEK_SET) { $this->buffer = ''; $this->cipherMethod->seek(0, SEEK_SET); $this->stream->seek(0, SEEK_SET); } else { throw new LogicException('AES encryption streams only support being' . ' rewound, not arbitrary seeking.'); } } private function decryptBlock($length) { if ($this->stream->eof()) { return ''; } $cipherText = ''; do { $cipherText .= $this->stream->read((int) ($length - strlen($cipherText))); } while (strlen($cipherText) < $length && !$this->stream->eof()); $options = OPENSSL_RAW_DATA; if (!$this->stream->eof() && $this->stream->getSize() !== $this->stream->tell() ) { $options |= OPENSSL_ZERO_PADDING; } $plaintext = openssl_decrypt( $cipherText, $this->cipherMethod->getOpenSslName(), $this->key, $options, $this->cipherMethod->getCurrentIv() ); $this->cipherMethod->update($cipherText); return $plaintext; } }