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