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<?php namespace Aws\Crypto; abstract class MaterialsProviderV2 implements MaterialsProviderInterfaceV2 { private static $supportedKeySizes = [ 128 => true, 256 => true, ]; /** * Returns if the requested size is supported by AES. * * @param int $keySize Size of the requested key in bits. * * @return bool */ public static function isSupportedKeySize($keySize) { return isset(self::$supportedKeySizes[$keySize]); } /** * Returns the wrap algorithm name for this Provider. * * @return string */ abstract public function getWrapAlgorithmName(); /** * Takes an encrypted content encryption key (CEK) and material description * for use decrypting the key according to the Provider's specifications. * * @param string $encryptedCek Encrypted key to be decrypted by the Provider * for use decrypting other data. * @param string $materialDescription Material Description for use in * decrypting the CEK. * @param string $options Options for use in decrypting the CEK. * * @return string */ abstract public function decryptCek($encryptedCek, $materialDescription, $options); /** * @param string $keySize Length of a cipher key in bits for generating a * random content encryption key (CEK). * @param array $context Context map needed for key encryption * @param array $options Additional options to be used in CEK generation * * @return array */ abstract public function generateCek($keySize, $context, $options); /** * @param string $openSslName Cipher OpenSSL name to use for generating * an initialization vector. * * @return string */ public function generateIv($openSslName) { return openssl_random_pseudo_bytes( openssl_cipher_iv_length($openSslName) ); } }
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