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<?php |
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|
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namespace Dudlewebs\WPMCS\s3\Aws\Crypto\Cipher; |
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|
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use InvalidArgumentException; |
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use LogicException; |
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/** |
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* An implementation of the CBC cipher for use with an AesEncryptingStream or |
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* AesDecrypting stream. |
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* |
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* This cipher method is deprecated and in maintenance mode - no new updates will be |
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* released. Please see https://docs.aws.amazon.com/general/latest/gr/aws_sdk_cryptography.html |
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* for more information. |
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* |
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* @deprecated |
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*/ |
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class Cbc implements CipherMethod |
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{ |
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const BLOCK_SIZE = 16; |
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/** |
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* @var string |
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*/ |
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private $baseIv; |
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/** |
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* @var string |
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*/ |
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private $iv; |
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/** |
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* @var int |
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*/ |
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private $keySize; |
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/** |
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* @param string $iv Base Initialization Vector for the cipher. |
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* @param int $keySize Size of the encryption key, in bits, that will be |
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* used. |
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* |
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* @throws InvalidArgumentException Thrown if the passed iv does not match |
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* the iv length required by the cipher. |
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*/ |
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public function __construct($iv, $keySize = 256) |
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{ |
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$this->baseIv = $this->iv = $iv; |
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$this->keySize = $keySize; |
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if (\strlen($iv) !== \openssl_cipher_iv_length($this->getOpenSslName())) { |
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throw new InvalidArgumentException('Invalid initialization vector'); |
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} |
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} |
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public function getOpenSslName() |
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{ |
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return "aes-{$this->keySize}-cbc"; |
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} |
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public function getAesName() |
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{ |
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return 'AES/CBC/PKCS5Padding'; |
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} |
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public function getCurrentIv() |
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{ |
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return $this->iv; |
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} |
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public function requiresPadding() |
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{ |
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return \true; |
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} |
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public function seek($offset, $whence = \SEEK_SET) |
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{ |
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if ($offset === 0 && $whence === \SEEK_SET) { |
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$this->iv = $this->baseIv; |
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} else { |
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throw new LogicException('CBC initialization only support being' . ' rewound, not arbitrary seeking.'); |
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} |
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} |
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public function update($cipherTextBlock) |
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{ |
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$this->iv = \substr($cipherTextBlock, self::BLOCK_SIZE * -1); |
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} |
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} |
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