将我的加密库从Mcrypt升级到OpenSSL

Question

我正在使用以下通常引用的库进行加密。我想将其从Mcrypt升级到OpenSSL，以便不再使用不推荐使用的库。

<?php

namespace Utilities\Encryption;

/**
* A class to handle secure encryption and decryption of arbitrary data
*
* Note that this is not just straight encryption.  It also has a few other
* features in it to make the encrypted data far more secure.  Note that any
* other implementations used to decrypt data will have to do the same exact
*  operations.  
*
* Security Benefits:
*
* - Uses Key stretching
* - Hides the Initialization Vector
* - Does HMAC verification of source data
*
*/

class Encryption {

/**
 * @var string $cipher The mcrypt cipher to use for this instance
 */
protected $cipher = '';

/**
 * @var int $mode The mcrypt cipher mode to use
 */
protected $mode = '';

/**
 * @var int $rounds The number of rounds to feed into PBKDF2 for key generation
 */
protected $rounds = 100;

/**
 * Constructor!
 *
 * @param string $cipher The MCRYPT_* cypher to use for this instance
 * @param int    $mode   The MCRYPT_MODE_* mode to use for this instance
 * @param int    $rounds The number of PBKDF2 rounds to do on the key
 */
public function __construct($cipher, $mode, $rounds = 100) {
    $this->cipher = $cipher;
    $this->mode = $mode;
    $this->rounds = (int) $rounds;
}

/**
 * Decrypt the data with the provided key
 *
 * @param string $data The encrypted datat to decrypt
 * @param string $key  The key to use for decryption
 * 
 * @returns string|false The returned string if decryption is successful
 *                           false if it is not
 */
public function decrypt($data, $key) {
    $salt = substr($data, 0, 128);
    $enc = substr($data, 128, -64);
    $mac = substr($data, -64);

    list ($cipherKey, $macKey, $iv) = $this->getKeys($salt, $key);

    if ($mac !== hash_hmac('sha512', $enc, $macKey, true)) {
         return false;
    }

    $dec = mcrypt_decrypt($this->cipher, $cipherKey, $enc, $this->mode, $iv);

    $data = $this->unpad($dec);

    return $data;
}

/**
 * Encrypt the supplied data using the supplied key
 * 
 * @param string $data The data to encrypt
 * @param string $key  The key to encrypt with
 *
 * @returns string The encrypted data
 */
public function encrypt($data, $key) {
    $salt = mcrypt_create_iv(128, MCRYPT_DEV_URANDOM);
    list ($cipherKey, $macKey, $iv) = $this->getKeys($salt, $key);

    $data = $this->pad($data);

    $enc = mcrypt_encrypt($this->cipher, $cipherKey, $data, $this->mode, $iv);

    $mac = hash_hmac('sha512', $enc, $macKey, true);
    return $salt . $enc . $mac;
}

/**
 * Generates a set of keys given a random salt and a master key
 *
 * @param string $salt A random string to change the keys each encryption
 * @param string $key  The supplied key to encrypt with
 *
 * @returns array An array of keys (a cipher key, a mac key, and a IV)
 */
protected function getKeys($salt, $key) {
    $ivSize = mcrypt_get_iv_size($this->cipher, $this->mode);
    $keySize = mcrypt_get_key_size($this->cipher, $this->mode);
    $length = 2 * $keySize + $ivSize;

    $key = $this->pbkdf2('sha512', $key, $salt, $this->rounds, $length);

    $cipherKey = substr($key, 0, $keySize);
    $macKey = substr($key, $keySize, $keySize);
    $iv = substr($key, 2 * $keySize);
    return array($cipherKey, $macKey, $iv);
}

/**
 * Stretch the key using the PBKDF2 algorithm
 *
 * @see http://en.wikipedia.org/wiki/PBKDF2
 *
 * @param string $algo   The algorithm to use
 * @param string $key    The key to stretch
 * @param string $salt   A random salt
 * @param int    $rounds The number of rounds to derive
 * @param int    $length The length of the output key
 *
 * @returns string The derived key.
 */
protected function pbkdf2($algo, $key, $salt, $rounds, $length) {
    $size   = strlen(hash($algo, '', true));
    $len    = ceil($length / $size);
    $result = '';
    for ($i = 1; $i <= $len; $i++) {
        $tmp = hash_hmac($algo, $salt . pack('N', $i), $key, true);
        $res = $tmp;
        for ($j = 1; $j < $rounds; $j++) {
             $tmp  = hash_hmac($algo, $tmp, $key, true);
             $res ^= $tmp;
        }
        $result .= $res;
    }
    return substr($result, 0, $length);
}

protected function pad($data) {
    $length = mcrypt_get_block_size($this->cipher, $this->mode);
    $padAmount = $length - strlen($data) % $length;
    if ($padAmount == 0) {
        $padAmount = $length;
    }
    return $data . str_repeat(chr($padAmount), $padAmount);
}

protected function unpad($data) {
    $length = mcrypt_get_block_size($this->cipher, $this->mode);
    $last = ord($data[strlen($data) - 1]);
    if ($last > $length) return false;
    if (substr($data, -1 * $last) !== str_repeat(chr($last), $last)) {
        return false;
    }
    return substr($data, 0, -1 * $last);
 }
}

更新：我一直在尝试通过将库转换为OpenSSL来解密使用OpenSSL使用Mcrypt加密的字符串。

然后，我使用上面的代码使用密钥对字符串加密，并尝试使用下面的代码和相同的密钥解密该值。但是我只是得到一个空白的答复。如果我注释掉：

$ data = $ this-> unpad（$ dec）

在解密函数中，我得到了一个字符串，但它只是混杂字符（很像第一次加密时的样子。）

<?php

namespace Utilities\Encryption;

/**
* A class to handle secure encryption and decryption of arbitrary data
*
* Note that this is not just straight encryption.  It also has a few other
*  features in it to make the encrypted data far more secure.  Note that any
*  other implementations used to decrypt data will have to do the same exact
*  operations.  
*
* Security Benefits:
*
* - Uses Key stretching
* - Hides the Initialization Vector
* - Does HMAC verification of source data
*
*/
class EncryptionOpenSsl {

/**
 * @var string $cipher The mcrypt cipher to use for this instance
 */
protected $cipher = '';

/**
 * @var int $mode The mcrypt cipher mode to use
 */
protected $mode = '';

/**
 * @var int $rounds The number of rounds to feed into PBKDF2 for key generation
 */
protected $rounds = 100;

/**
 * Constructor!
 *
 * @param string $cipher The MCRYPT_* cypher to use for this instance
 * @param int    $mode   The MCRYPT_MODE_* mode to use for this instance
 * @param int    $rounds The number of PBKDF2 rounds to do on the key
 */
public function __construct($cipher, $rounds = 100) {
    $this->cipher = $cipher;
    // $this->mode = MCRYPT_MODE_CBC;
    $this->rounds = (int) $rounds;
}

/**
 * Decrypt the data with the provided key
 *
 * @param string $data The encrypted datat to decrypt
 * @param string $key  The key to use for decryption
 * 
 * @returns string|false The returned string if decryption is successful
 *                           false if it is not
 */
public function decrypt($data, $key) {
    $salt = substr($data, 0, 128);
    $enc = substr($data, 128, -64);
    $mac = substr($data, -64);

    list ($cipherKey, $macKey, $iv) = $this->getKeys($salt, $key);

    if ($mac !== hash_hmac('sha512', $enc, $macKey, true)) {
         return false;
    }
    $dec = openssl_decrypt($enc, $this->cipher, $key, OPENSSL_RAW_DATA, $iv);
    // $dec = mcrypt_decrypt($this->cipher, $cipherKey, $enc, $this->mode, $iv);

    $data = $this->unpad($dec);

    return $data;
}

/**
 * Encrypt the supplied data using the supplied key
 * 
 * @param string $data The data to encrypt
 * @param string $key  The key to encrypt with
 *
 * @returns string The encrypted data
 */
public function encrypt($data, $key) {
    $salt = mcrypt_create_iv(128, MCRYPT_DEV_URANDOM);
    list ($cipherKey, $macKey, $iv) = $this->getKeys($salt, $key);

    $data = $this->pad($data);

    $enc = mcrypt_encrypt($this->cipher, $cipherKey, $data, $this->mode, $iv);

    $mac = hash_hmac('sha512', $enc, $macKey, true);
    return $salt . $enc . $mac;
}

/**
 * Generates a set of keys given a random salt and a master key
 *
 * @param string $salt A random string to change the keys each encryption
 * @param string $key  The supplied key to encrypt with
 *
 * @returns array An array of keys (a cipher key, a mac key, and a IV)
 */
protected function getKeys($salt, $key) {
    $ivSize = mcrypt_get_iv_size(MCRYPT_BLOWFISH, MCRYPT_MODE_CBC);
    $keySize = mcrypt_get_key_size(MCRYPT_BLOWFISH, MCRYPT_MODE_CBC);
    $length = 2 * $keySize + $ivSize;

    $key = $this->pbkdf2('sha512', $key, $salt, $this->rounds, $length);

    $cipherKey = substr($key, 0, $keySize);
    $macKey = substr($key, $keySize, $keySize);
    $iv = substr($key, 2 * $keySize);
    return array($cipherKey, $macKey, $iv);
}

/**
 * Stretch the key using the PBKDF2 algorithm
 *
 * @see http://en.wikipedia.org/wiki/PBKDF2
 *
 * @param string $algo   The algorithm to use
 * @param string $key    The key to stretch
 * @param string $salt   A random salt
 * @param int    $rounds The number of rounds to derive
 * @param int    $length The length of the output key
 *
 * @returns string The derived key.
 */
protected function pbkdf2($algo, $key, $salt, $rounds, $length) {
    $size   = strlen(hash($algo, '', true));
    $len    = ceil($length / $size);
    $result = '';
    for ($i = 1; $i <= $len; $i++) {
        $tmp = hash_hmac($algo, $salt . pack('N', $i), $key, true);
        $res = $tmp;
        for ($j = 1; $j < $rounds; $j++) {
             $tmp  = hash_hmac($algo, $tmp, $key, true);
             $res ^= $tmp;
        }
        $result .= $res;
    }
    return substr($result, 0, $length);
}

protected function pad($data) {
    $length = mcrypt_get_block_size(MCRYPT_BLOWFISH, MCRYPT_MODE_CBC);
    $padAmount = $length - strlen($data) % $length;
    if ($padAmount == 0) {
        $padAmount = $length;
    }
    return $data . str_repeat(chr($padAmount), $padAmount);
}

protected function unpad($data) {
    $length = mcrypt_get_block_size(MCRYPT_BLOWFISH, MCRYPT_MODE_CBC);
    $last = ord($data[strlen($data) - 1]);
    if ($last > $length) return false;
    if (substr($data, -1 * $last) !== str_repeat(chr($last), $last)) {
        return false;
    }
    return substr($data, 0, -1 * $last);
 }
}

Answer 1

解密程序的以下代码对我有用：

public function decrypt($data, $key) {
    $salt = substr($data, 0, 128);
    $enc = substr($data, 128, -64);
    $mac = substr($data, -64);

    list ($cipherKey, $macKey, $iv) = $this->getKeys($salt, $key);

    if ($mac !== hash_hmac('sha512', $enc, $macKey, true)) {
         return false;
    }

    $dec = openssl_decrypt($enc, $this->cipher, $cipherKey, OPENSSL_RAW_DATA, $iv);

    return $dec;
}

测试：

$keys = [
    'this is a secret key.',
    'G906m70p(IhzA5T&5x7(w0%a631)u)%D6E79cIYJQ!iP2U(xT13q6)tJ6gZ3D2wi&0")7cP5',
    chr(6) . chr(200) . chr(16) . 'my key ' . chr(3) . chr(4) . chr(192) . chr(254) . ' zyx0987!!',
    'and finally one more key to test with here:',
];


$data = [
    'A',
    'This is a test',
    'now test encrypting something a little bit longer with 1234567890.',
    '$length = mcrypt_get_block_size(MCRYPT_BLOWFISH, MCRYPT_MODE_CBC); $last = ord($data[strlen($data) - 1]);',
    'Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec sit amet pharetra urna. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Ut fringilla, quam sed eleifend eleifend, justo turpis consectetur tellus, quis tristique eros erat at nibh. Nunc dictum neque vel diam molestie fermentum. Pellentesque dignissim dui quis tortor eleifend, ut maximus elit egestas. Donec posuere odio et auctor porta. Quisque placerat condimentum maximus. Curabitur luctus dolor eget sem luctus, in dignissim tortor venenatis. Mauris eget nulla nisl.',
];

$failures = 0;

foreach ($data as $datum) {
    foreach ($keys as $key) {
        $enc = new Encryption(MCRYPT_BLOWFISH, MCRYPT_MODE_CBC);

        $encrypted = $enc->encrypt($datum, $key);

        $dec = new EncryptionOpenSsl('bf-cbc');

        $decrypted = $dec->decrypt($encrypted, $key);

        if (strcmp($datum, $decrypted) !== 0) {
            echo "Encryption with key '$key' of '$datum' failed.  '$decrypted' != '$datum'<br><br>\n\n";
            $failures++;
        }
    }
}

if ($failures) {
    echo "$failures tests failed.<br>\n";
} else {
    echo "ALL OKAY<br>\n";
}

如果您可以确定它也适用，那么我可以整理答案并添加最终的工作代码。