<?php
namespace Aws\Crypto;
use Aws\Crypto\Cipher\CipherMethod;
use Aws\Crypto\Cipher\Cbc;
use GuzzleHttp\Psr7\Stream;
/**
* Legacy abstract encryption client. New workflows should use
* AbstractCryptoClientV2.
*
* @deprecated
* @internal
*/
abstract class AbstractCryptoClient
{
public static $supportedCiphers = ['cbc', 'gcm'];
public static $supportedKeyWraps = [
KmsMaterialsProvider::WRAP_ALGORITHM_NAME
];
/**
* Returns if the passed cipher name is supported for encryption by the SDK.
*
* @param string $cipherName The name of a cipher to verify is registered.
*
* @return bool If the cipher passed is in our supported list.
*/
public static function isSupportedCipher($cipherName)
{
return in_array($cipherName, self::$supportedCiphers);
}
/**
* Returns an identifier recognizable by `openssl_*` functions, such as
* `aes-256-cbc` or `aes-128-ctr`.
*
* @param string $cipherName Name of the cipher being used for encrypting
* or decrypting.
* @param int $keySize Size of the encryption key, in bits, that will be
* used.
*
* @return string
*/
abstract protected function getCipherOpenSslName($cipherName, $keySize);
/**
* Constructs a CipherMethod for the given name, initialized with the other
* data passed for use in encrypting or decrypting.
*
* @param string $cipherName Name of the cipher to generate for encrypting.
* @param string $iv Base Initialization Vector for the cipher.
* @param int $keySize Size of the encryption key, in bits, that will be
* used.
*
* @return CipherMethod
*
* @internal
*/
abstract protected function buildCipherMethod($cipherName, $iv, $keySize);
/**
* Performs a reverse lookup to get the openssl_* cipher name from the
* AESName passed in from the MetadataEnvelope.
*
* @param $aesName
*
* @return string
*
* @internal
*/
abstract protected function getCipherFromAesName($aesName);
/**
* Dependency to provide an interface for building an encryption stream for
* data given cipher details, metadata, and materials to do so.
*
* @param Stream $plaintext Plain-text data to be encrypted using the
* materials, algorithm, and data provided.
* @param array $cipherOptions Options for use in determining the cipher to
* be used for encrypting data.
* @param MaterialsProvider $provider A provider to supply and encrypt
* materials used in encryption.
* @param MetadataEnvelope $envelope A storage envelope for encryption
* metadata to be added to.
*
* @return AesStreamInterface
*
* @internal
*/
abstract public function encrypt(
Stream $plaintext,
array $cipherOptions,
MaterialsProvider $provider,
MetadataEnvelope $envelope
);
/**
* Dependency to provide an interface for building a decryption stream for
* cipher text given metadata and materials to do so.
*
* @param string $cipherText Plain-text data to be decrypted using the
* materials, algorithm, and data provided.
* @param MaterialsProviderInterface $provider A provider to supply and encrypt
* materials used in encryption.
* @param MetadataEnvelope $envelope A storage envelope for encryption
* metadata to be read from.
* @param array $cipherOptions Additional verification options.
*
* @return AesStreamInterface
*
* @internal
*/
abstract public function decrypt(
$cipherText,
MaterialsProviderInterface $provider,
MetadataEnvelope $envelope,
array $cipherOptions = []
);
}