/
Encryptor.php
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/
Encryptor.php
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<?php
/**
* Copyright © 2016 Magento. All rights reserved.
* See COPYING.txt for license details.
*/
namespace Magento\Framework\Encryption;
use Magento\Framework\App\DeploymentConfig;
use Magento\Framework\Encryption\Helper\Security;
use Magento\Framework\Math\Random;
/**
* Class Encryptor provides basic logic for hashing strings and encrypting/decrypting misc data
*/
class Encryptor implements EncryptorInterface
{
/**
* Key of md5 algorithm
*/
const HASH_VERSION_MD5 = 0;
/**
* Key of sha256 algorithm
*/
const HASH_VERSION_SHA256 = 1;
/**
* Key of latest used algorithm
*/
const HASH_VERSION_LATEST = 1;
/**
* Default length of salt in bytes
*/
const DEFAULT_SALT_LENGTH = 32;
/**#@+
* Exploded password hash keys
*/
const PASSWORD_HASH = 0;
const PASSWORD_SALT = 1;
const PASSWORD_VERSION = 2;
/**#@-*/
/**
* Array key of encryption key in deployment config
*/
const PARAM_CRYPT_KEY = 'crypt/key';
/**#@+
* Cipher versions
*/
const CIPHER_BLOWFISH = 0;
const CIPHER_RIJNDAEL_128 = 1;
const CIPHER_RIJNDAEL_256 = 2;
const CIPHER_LATEST = 2;
/**#@-*/
/**
* Default hash string delimiter
*/
const DELIMITER = ':';
/**
* @var array map of hash versions
*/
private $hashVersionMap = [
self::HASH_VERSION_MD5 => 'md5',
self::HASH_VERSION_SHA256 => 'sha256'
];
/**
* @var array map of password hash
*/
private $passwordHashMap = [
self::PASSWORD_HASH => '',
self::PASSWORD_SALT => '',
self::PASSWORD_VERSION => self::HASH_VERSION_LATEST
];
/**
* Indicate cipher
*
* @var int
*/
protected $cipher = self::CIPHER_LATEST;
/**
* Version of encryption key
*
* @var int
*/
protected $keyVersion;
/**
* Array of encryption keys
*
* @var string[]
*/
protected $keys = [];
/**
* @param Random $random
* @param DeploymentConfig $deploymentConfig
*/
public function __construct(
Random $random,
DeploymentConfig $deploymentConfig
) {
$this->random = $random;
// load all possible keys
$this->keys = preg_split('/\s+/s', trim($deploymentConfig->get(self::PARAM_CRYPT_KEY)));
$this->keyVersion = count($this->keys) - 1;
}
/**
* Check whether specified cipher version is supported
*
* Returns matched supported version or throws exception
*
* @param int $version
* @return int
* @throws \Exception
*/
public function validateCipher($version)
{
$types = [self::CIPHER_BLOWFISH, self::CIPHER_RIJNDAEL_128, self::CIPHER_RIJNDAEL_256];
$version = (int)$version;
if (!in_array($version, $types, true)) {
throw new \Exception((string)new \Magento\Framework\Phrase('Not supported cipher version'));
}
return $version;
}
/**
* @inheritdoc
*/
public function getHash($password, $salt = false, $version = self::HASH_VERSION_LATEST)
{
if ($salt === false) {
return $this->hash($password);
}
if ($salt === true) {
$salt = self::DEFAULT_SALT_LENGTH;
}
if (is_integer($salt)) {
$salt = $this->random->getRandomString($salt);
}
return implode(
self::DELIMITER,
[
$this->hash($salt . $password),
$salt,
$version
]
);
}
/**
* @inheritdoc
*/
public function hash($data, $version = self::HASH_VERSION_LATEST)
{
return hash($this->hashVersionMap[$version], $data);
}
/**
* @inheritdoc
*/
public function validateHash($password, $hash)
{
return $this->isValidHash($password, $hash);
}
/**
* @inheritdoc
*/
public function isValidHash($password, $hash)
{
$this->explodePasswordHash($hash);
foreach ($this->getPasswordVersion() as $hashVersion) {
$password = $this->hash($this->getPasswordSalt() . $password, $hashVersion);
}
return Security::compareStrings(
$password,
$this->getPasswordHash()
);
}
/**
* @inheritdoc
*/
public function validateHashVersion($hash, $validateCount = false)
{
$this->explodePasswordHash($hash);
$hashVersions = $this->getPasswordVersion();
return $validateCount
? end($hashVersions) === self::HASH_VERSION_LATEST && count($hashVersions) === 1
: end($hashVersions) === self::HASH_VERSION_LATEST;
}
/**
* @param string $hash
* @return array
*/
private function explodePasswordHash($hash)
{
$explodedPassword = explode(self::DELIMITER, $hash, 3);
foreach ($this->passwordHashMap as $key => $defaultValue) {
$this->passwordHashMap[$key] = (isset($explodedPassword[$key])) ? $explodedPassword[$key] : $defaultValue;
}
return $this->passwordHashMap;
}
/**
* @return string
*/
private function getPasswordHash()
{
return (string)$this->passwordHashMap[self::PASSWORD_HASH];
}
/**
* @return string
*/
private function getPasswordSalt()
{
return (string)$this->passwordHashMap[self::PASSWORD_SALT];
}
/**
* @return array
*/
private function getPasswordVersion()
{
return array_map('intval', explode(self::DELIMITER, $this->passwordHashMap[self::PASSWORD_VERSION]));
}
/**
* Prepend key and cipher versions to encrypted data after encrypting
*
* @param string $data
* @return string
*/
public function encrypt($data)
{
$crypt = $this->getCrypt();
if (null === $crypt) {
return $data;
}
return $this->keyVersion . ':' . $this->cipher . ':' . (MCRYPT_MODE_CBC ===
$crypt->getMode() ? $crypt->getInitVector() . ':' : '') . base64_encode(
$crypt->encrypt((string)$data)
);
}
/**
* Look for key and crypt versions in encrypted data before decrypting
*
* Unsupported/unspecified key version silently fallback to the oldest we have
* Unsupported cipher versions eventually throw exception
* Unspecified cipher version fallback to the oldest we support
*
* @param string $data
* @return string
*/
public function decrypt($data)
{
if ($data) {
$parts = explode(':', $data, 4);
$partsCount = count($parts);
$initVector = false;
// specified key, specified crypt, specified iv
if (4 === $partsCount) {
list($keyVersion, $cryptVersion, $iv, $data) = $parts;
$initVector = $iv ? $iv : false;
$keyVersion = (int)$keyVersion;
$cryptVersion = self::CIPHER_RIJNDAEL_256;
// specified key, specified crypt
} elseif (3 === $partsCount) {
list($keyVersion, $cryptVersion, $data) = $parts;
$keyVersion = (int)$keyVersion;
$cryptVersion = (int)$cryptVersion;
// no key version = oldest key, specified crypt
} elseif (2 === $partsCount) {
list($cryptVersion, $data) = $parts;
$keyVersion = 0;
$cryptVersion = (int)$cryptVersion;
// no key version = oldest key, no crypt version = oldest crypt
} elseif (1 === $partsCount) {
$keyVersion = 0;
$cryptVersion = self::CIPHER_BLOWFISH;
// not supported format
} else {
return '';
}
// no key for decryption
if (!isset($this->keys[$keyVersion])) {
return '';
}
$crypt = $this->getCrypt($this->keys[$keyVersion], $cryptVersion, $initVector);
if (null === $crypt) {
return '';
}
return trim($crypt->decrypt(base64_decode((string)$data)));
}
return '';
}
/**
* Return crypt model, instantiate if it is empty
*
* @param string|null $key NULL value means usage of the default key specified on constructor
* @return \Magento\Framework\Encryption\Crypt
* @throws \Exception
*/
public function validateKey($key)
{
if (preg_match('/\s/s', $key)) {
throw new \Exception((string)new \Magento\Framework\Phrase('The encryption key format is invalid.'));
}
return $this->getCrypt($key);
}
/**
* Attempt to append new key & version
*
* @param string $key
* @return $this
*/
public function setNewKey($key)
{
$this->validateKey($key);
$this->keys[] = $key;
$this->keyVersion += 1;
return $this;
}
/**
* Export current keys as string
*
* @return string
*/
public function exportKeys()
{
return implode("\n", $this->keys);
}
/**
* Initialize crypt module if needed
*
* By default initializes with latest key and crypt versions
*
* @param string $key
* @param int $cipherVersion
* @param bool $initVector
* @return Crypt|null
*/
protected function getCrypt($key = null, $cipherVersion = null, $initVector = true)
{
if (null === $key && null === $cipherVersion) {
$cipherVersion = self::CIPHER_RIJNDAEL_256;
}
if (null === $key) {
$key = $this->keys[$this->keyVersion];
}
if (!$key) {
return null;
}
if (null === $cipherVersion) {
$cipherVersion = $this->cipher;
}
$cipherVersion = $this->validateCipher($cipherVersion);
if ($cipherVersion === self::CIPHER_RIJNDAEL_128) {
$cipher = MCRYPT_RIJNDAEL_128;
$mode = MCRYPT_MODE_ECB;
} elseif ($cipherVersion === self::CIPHER_RIJNDAEL_256) {
$cipher = MCRYPT_RIJNDAEL_256;
$mode = MCRYPT_MODE_CBC;
} else {
$cipher = MCRYPT_BLOWFISH;
$mode = MCRYPT_MODE_ECB;
}
return new Crypt($key, $cipher, $mode, $initVector);
}
}