diff options
Diffstat (limited to 'vendor/aws/aws-sdk-php/src/Crypto/Cipher/Cbc.php')
-rw-r--r-- | vendor/aws/aws-sdk-php/src/Crypto/Cipher/Cbc.php | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/vendor/aws/aws-sdk-php/src/Crypto/Cipher/Cbc.php b/vendor/aws/aws-sdk-php/src/Crypto/Cipher/Cbc.php new file mode 100644 index 0000000..926f87c --- /dev/null +++ b/vendor/aws/aws-sdk-php/src/Crypto/Cipher/Cbc.php @@ -0,0 +1,88 @@ +<?php +namespace Aws\Crypto\Cipher; + +use \InvalidArgumentException; +use \LogicException; + +/** + * An implementation of the CBC cipher for use with an AesEncryptingStream or + * AesDecrypting stream. + * + * This cipher method is deprecated and in maintenance mode - no new updates will be + * released. Please see https://docs.aws.amazon.com/general/latest/gr/aws_sdk_cryptography.html + * for more information. + * + * @deprecated + */ +class Cbc implements CipherMethod +{ + const BLOCK_SIZE = 16; + + /** + * @var string + */ + private $baseIv; + + /** + * @var string + */ + private $iv; + + /** + * @var int + */ + private $keySize; + + /** + * @param string $iv Base Initialization Vector for the cipher. + * @param int $keySize Size of the encryption key, in bits, that will be + * used. + * + * @throws InvalidArgumentException Thrown if the passed iv does not match + * the iv length required by the cipher. + */ + public function __construct($iv, $keySize = 256) + { + $this->baseIv = $this->iv = $iv; + $this->keySize = $keySize; + + if (strlen($iv) !== openssl_cipher_iv_length($this->getOpenSslName())) { + throw new InvalidArgumentException('Invalid initialization vector'); + } + } + + public function getOpenSslName() + { + return "aes-{$this->keySize}-cbc"; + } + + public function getAesName() + { + return 'AES/CBC/PKCS5Padding'; + } + + public function getCurrentIv() + { + return $this->iv; + } + + public function requiresPadding() + { + return true; + } + + public function seek($offset, $whence = SEEK_SET) + { + if ($offset === 0 && $whence === SEEK_SET) { + $this->iv = $this->baseIv; + } else { + throw new LogicException('CBC initialization only support being' + . ' rewound, not arbitrary seeking.'); + } + } + + public function update($cipherTextBlock) + { + $this->iv = substr($cipherTextBlock, self::BLOCK_SIZE * -1); + } +} |