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<?php
namespace Aws\Crypto;
use GuzzleHttp\Psr7;
use GuzzleHttp\Psr7\AppendStream;
use GuzzleHttp\Psr7\Stream;
trait EncryptionTrait
{
private static $allowedOptions = [
'Cipher' => true,
'KeySize' => true,
'Aad' => true,
];
/**
* Dependency to generate a CipherMethod from a set of inputs for loading
* in to an AesEncryptingStream.
*
* @param string $cipherName Name of the cipher to generate for encrypting.
* @param string $iv Base Initialization Vector for the cipher.
* @param int $keySize Size of the encryption key, in bits, that will be
* used.
*
* @return Cipher\CipherMethod
*
* @internal
*/
abstract protected function buildCipherMethod($cipherName, $iv, $keySize);
/**
* Builds an AesStreamInterface and populates encryption metadata into the
* supplied envelope.
*
* @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
*
* @throws \InvalidArgumentException Thrown when a value in $cipherOptions
* is not valid.
*
* @internal
*/
public function encrypt(
Stream $plaintext,
array $cipherOptions,
MaterialsProvider $provider,
MetadataEnvelope $envelope
) {
$materialsDescription = $provider->getMaterialsDescription();
$cipherOptions = array_intersect_key(
$cipherOptions,
self::$allowedOptions
);
if (empty($cipherOptions['Cipher'])) {
throw new \InvalidArgumentException('An encryption cipher must be'
. ' specified in the "cipher_options".');
}
if (!self::isSupportedCipher($cipherOptions['Cipher'])) {
throw new \InvalidArgumentException('The cipher requested is not'
. ' supported by the SDK.');
}
if (empty($cipherOptions['KeySize'])) {
$cipherOptions['KeySize'] = 256;
}
if (!is_int($cipherOptions['KeySize'])) {
throw new \InvalidArgumentException('The cipher "KeySize" must be'
. ' an integer.');
}
if (!MaterialsProvider::isSupportedKeySize(
$cipherOptions['KeySize']
)) {
throw new \InvalidArgumentException('The cipher "KeySize" requested'
. ' is not supported by AES (128, 192, or 256).');
}
$cipherOptions['Iv'] = $provider->generateIv(
$this->getCipherOpenSslName(
$cipherOptions['Cipher'],
$cipherOptions['KeySize']
)
);
$cek = $provider->generateCek($cipherOptions['KeySize']);
list($encryptingStream, $aesName) = $this->getEncryptingStream(
$plaintext,
$cek,
$cipherOptions
);
// Populate envelope data
$envelope[MetadataEnvelope::CONTENT_KEY_V2_HEADER] =
$provider->encryptCek(
$cek,
$materialsDescription
);
unset($cek);
$envelope[MetadataEnvelope::IV_HEADER] =
base64_encode($cipherOptions['Iv']);
$envelope[MetadataEnvelope::KEY_WRAP_ALGORITHM_HEADER] =
$provider->getWrapAlgorithmName();
$envelope[MetadataEnvelope::CONTENT_CRYPTO_SCHEME_HEADER] = $aesName;
$envelope[MetadataEnvelope::UNENCRYPTED_CONTENT_LENGTH_HEADER] =
strlen($plaintext);
$envelope[MetadataEnvelope::MATERIALS_DESCRIPTION_HEADER] =
json_encode($materialsDescription);
if (!empty($cipherOptions['Tag'])) {
$envelope[MetadataEnvelope::CRYPTO_TAG_LENGTH_HEADER] =
strlen($cipherOptions['Tag']) * 8;
}
return $encryptingStream;
}
/**
* Generates a stream that wraps the plaintext with the proper cipher and
* uses the content encryption key (CEK) to encrypt the data when read.
*
* @param Stream $plaintext Plain-text data to be encrypted using the
* materials, algorithm, and data provided.
* @param string $cek A content encryption key for use by the stream for
* encrypting the plaintext data.
* @param array $cipherOptions Options for use in determining the cipher to
* be used for encrypting data.
*
* @return [AesStreamInterface, string]
*
* @internal
*/
protected function getEncryptingStream(
Stream $plaintext,
$cek,
&$cipherOptions
) {
switch ($cipherOptions['Cipher']) {
case 'gcm':
$cipherOptions['TagLength'] = 16;
$cipherTextStream = new AesGcmEncryptingStream(
$plaintext,
$cek,
$cipherOptions['Iv'],
$cipherOptions['Aad'] = isset($cipherOptions['Aad'])
? $cipherOptions['Aad']
: '',
$cipherOptions['TagLength'],
$cipherOptions['KeySize']
);
if (!empty($cipherOptions['Aad'])) {
trigger_error("'Aad' has been supplied for content encryption"
. " with " . $cipherTextStream->getAesName() . ". The"
. " PHP SDK encryption client can decrypt an object"
. " encrypted in this way, but other AWS SDKs may not be"
. " able to.", E_USER_WARNING);
}
$appendStream = new AppendStream([
$cipherTextStream->createStream()
]);
$cipherOptions['Tag'] = $cipherTextStream->getTag();
$appendStream->addStream(Psr7\Utils::streamFor($cipherOptions['Tag']));
return [$appendStream, $cipherTextStream->getAesName()];
default:
$cipherMethod = $this->buildCipherMethod(
$cipherOptions['Cipher'],
$cipherOptions['Iv'],
$cipherOptions['KeySize']
);
$cipherTextStream = new AesEncryptingStream(
$plaintext,
$cek,
$cipherMethod
);
return [$cipherTextStream, $cipherTextStream->getAesName()];
}
}
}
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