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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)
);
}
}