从MySQL中选择加密数据

时间:2015-03-26 15:50:59

标签: php mysql encryption

我将一些加密信息存储在MySQL数据库中,但由于某种原因我无法将其恢复。我将加密数据存储为 BINARY(46)。为什么我的选择语句失败了?

这是我的SELECT语句:

SELECT max(created) FROM incentive_sales WHERE incentive_sales.accountID = :aid

所以我不应该为select语句加密accountID(:aid)吗?

这是我的加密功能:

private function _encrypt($decrypted, $password, $salt = '|SgQLL*ea!UMwf^s%'){
  // Build a 256-bit $key which is a SHA256 hash of $salt and $password.
  $key = hash('SHA256', $salt . $password, true);
  // Build $iv and $iv_base64.  We use a block size of 128 bits (AES compliant) and CBC mode.  (Note: ECB mode is inadequate as IV is not used.)
  srand(); $iv = mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC), MCRYPT_RAND);
  if (strlen($iv_base64 = rtrim(base64_encode($iv), '=')) != 22){
    return false;    
  }
  // Encrypt $decrypted using $key.
  $encrypted = base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $key, $decrypted, MCRYPT_MODE_CBC, $iv));
  return $iv_base64.$encrypted;
}

我的解密功能:

private function _decrypt($encrypted, $password, $salt = '|SgQLL*ea!UMwf^s%'){
  // Build a 256-bit $key which is a SHA256 hash of $salt and $password.
  $key = hash('SHA256', $salt . $password, true);
  // Retrieve $iv which is the first 22 characters plus ==, base64_decoded.
  $iv = base64_decode(substr($encrypted, 0, 22) . '==');
  // Remove $iv from $encrypted.
  $encrypted = substr($encrypted, 22);
  // Decrypt the data.
  $decrypted = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $key, base64_decode($encrypted), MCRYPT_MODE_CBC, $iv)
  return $decrypted;
}

1 个答案:

答案 0 :(得分:0)

正确的答案是,"据我所知,你不能将加密数据用作where子句中的选择,因为它总是不同的。"

为了避免这种情况(因为我希望能够根据加密数据进行选择),我还存储了加密数据的散列/加盐值,然后我在select语句中使用该值。