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<?php
namespace Aws\Crypto;
use Aws\Exception\CryptoException;
use Aws\Kms\KmsClient;
/**
* Uses KMS to supply materials for encrypting and decrypting data. This
* V2 implementation should be used with the V2 encryption clients (i.e.
* S3EncryptionClientV2).
*/
class KmsMaterialsProviderV2 extends MaterialsProviderV2 implements MaterialsProviderInterfaceV2
{
const WRAP_ALGORITHM_NAME = 'kms+context';
private $kmsClient;
private $kmsKeyId;
/**
* @param KmsClient $kmsClient A KMS Client for use encrypting and
* decrypting keys.
* @param string $kmsKeyId The private KMS key id to be used for encrypting
* and decrypting keys.
*/
public function __construct(
KmsClient $kmsClient,
$kmsKeyId = null
) {
$this->kmsClient = $kmsClient;
$this->kmsKeyId = $kmsKeyId;
}
/**
* @inheritDoc
*/
public function getWrapAlgorithmName()
{
return self::WRAP_ALGORITHM_NAME;
}
/**
* @inheritDoc
*/
public function decryptCek($encryptedCek, $materialDescription, $options)
{
$params = [
'CiphertextBlob' => $encryptedCek,
'EncryptionContext' => $materialDescription
];
if (empty($options['@KmsAllowDecryptWithAnyCmk'])) {
if (empty($this->kmsKeyId)) {
throw new CryptoException('KMS CMK ID was not specified and the'
. ' operation is not opted-in to attempting to use any valid'
. ' CMK it discovers. Please specify a CMK ID, or explicitly'
. ' enable attempts to use any valid KMS CMK with the'
. ' @KmsAllowDecryptWithAnyCmk option.');
}
$params['KeyId'] = $this->kmsKeyId;
}
$result = $this->kmsClient->decrypt($params);
return $result['Plaintext'];
}
/**
* @inheritDoc
*/
public function generateCek($keySize, $context, $options)
{
if (empty($this->kmsKeyId)) {
throw new CryptoException('A KMS key id is required for encryption'
. ' with KMS keywrap. Use a KmsMaterialsProviderV2 that has been'
. ' instantiated with a KMS key id.');
}
$options = array_change_key_case($options);
if (!isset($options['@kmsencryptioncontext'])
|| !is_array($options['@kmsencryptioncontext'])
) {
throw new CryptoException("'@KmsEncryptionContext' is a"
. " required argument when using KmsMaterialsProviderV2, and"
. " must be an associative array (or empty array).");
}
if (isset($options['@kmsencryptioncontext']['aws:x-amz-cek-alg'])) {
throw new CryptoException("Conflict in reserved @KmsEncryptionContext"
. " key aws:x-amz-cek-alg. This value is reserved for the S3"
. " Encryption Client and cannot be set by the user.");
}
$context = array_merge($options['@kmsencryptioncontext'], $context);
$result = $this->kmsClient->generateDataKey([
'KeyId' => $this->kmsKeyId,
'KeySpec' => "AES_{$keySize}",
'EncryptionContext' => $context
]);
return [
'Plaintext' => $result['Plaintext'],
'Ciphertext' => base64_encode($result['CiphertextBlob']),
'UpdatedContext' => $context
];
}
}
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