在PHP中加密，使用AES/Rijndael在C＃（WP7/Silverlight）中解密

Question

我在我的Android應用程序中使用了用PHP編寫的REST服務，沒有太大麻煩。現在我試圖在Windows Phone應用程序中使用它，我已經瘋了！

我所知道的，到目前爲止：Silverlight will accept only Aes in CBC mode and PKCS7 padding.

我得到什麼：「填充是無效的不能刪除」的例外（見完整的代碼在底部）：

plaintext = srDecrypt.ReadToEnd(); 

如果我隱窩並在C＃中解密，使用相同的配置，它工作正常。當我嘗試使用PHP加密字符串在C＃中進行標識時，它會因上面提到的錯誤而失敗。

我的PHP腳本執行以下操作：

function encrypt128($message) { 
    $vector = "DB96A56CCA7A69FC"; 
    $key = "6DBC44F54CA3CFDEDDCA140CA46A99C1"; // PHP md5 function leaves it in lower case, so I just copied the key from C# debug. 

    //PKCS7 Padding 
    $block = mcrypt_get_block_size('rijndael_128', 'cbc'); 
    $pad = $block - (strlen($message) % $block); 
    $message.= str_repeat(chr($pad), $pad); 

    $cipher = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', 'cbc', ''); 
    mcrypt_generic_init($cipher, $key, $vector); 
    $result = mcrypt_generic($cipher, $message); 
    mcrypt_generic_deinit($cipher); 

    return base64_encode($result); 
} 

而在C＃（的Silverlight/Windows Phone 7的）我用下面的解密：

//Where buffer is the string data I got after calling the PHP REST service. 
DecryptStringFromBytes(Convert.FromBase64String(buffer), MD5Core.GetHash("7a272d3e41372c547a272d3e41372c54"), System.Text.Encoding.UTF8.GetBytes("DB96A56CCA7A69FC")); 

static string DecryptStringFromBytes(byte[] cipherText, byte[] Key, byte[] IV) 
{ 
    // Check arguments. 
    if (cipherText == null || cipherText.Length <= 0) 
     throw new ArgumentNullException("cipherText"); 
    if (Key == null || Key.Length <= 0) 
     throw new ArgumentNullException("Key"); 
    if (IV == null || IV.Length <= 0) 
     throw new ArgumentNullException("Key"); 

    // Declare the string used to hold 
    // the decrypted text. 
    string plaintext = null; 

    // Create an RijndaelManaged object 
    // with the specified key and IV. 
    using (AesManaged rijAlg = new AesManaged()) 
    { 
     rijAlg.Key = Key; 
     rijAlg.IV = IV; 

     // Create a decrytor to perform the stream transform. 
     ICryptoTransform decryptor = rijAlg.CreateDecryptor(rijAlg.Key, rijAlg.IV); 

     // Create the streams used for decryption. 
     using (MemoryStream msDecrypt = new MemoryStream(cipherText)) 
     { 
      using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read)) 
      { 
       using (StreamReader srDecrypt = new StreamReader(csDecrypt)) 
       { 

        // Read the decrypted bytes from the decrypting stream 
        // and place them in a string. 
        plaintext = srDecrypt.ReadToEnd(); 
       } 
      } 
     } 
    } 
    return plaintext; 
} 

最大的問題是：我是什麼做錯了？

在此先感謝！

Answer 1

因此，這裏的答案：

我DROP掉了MD5屁滾尿流的PHP和C＃，和他們現在工作正常。

爲防萬一你在這裏尋找相同的答案，這裏是一個示例代碼。不要忘了讓自己的密鑰和IV

PHP（雖然這些波紋管會的工作，不建議使用！）：

function encrypt128($message) { 
    $vector = "0000000000000000"; 
    $key = "00000000000000000000000000000000"; 

    $block = mcrypt_get_block_size('rijndael_128', 'cbc'); 
    $pad = $block - (strlen($message) % $block); 
    $message .= str_repeat(chr($pad), $pad); 

    $cipher = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', 'cbc', ''); 
    mcrypt_generic_init($cipher, $key, $vector); 
    $result = mcrypt_generic($cipher, $message); 
    mcrypt_generic_deinit($cipher); 

    return base64_encode($result); 
} 

C＃：

byte[] cripted = EncryptStringToBytes("Test", System.Text.Encoding.UTF8.GetBytes("00000000000000000000000000000000"), System.Text.Encoding.UTF8.GetBytes("0000000000000000")); 

Answer 2

加密/解密使用PHP：

class Cipher { 
    private $key, $iv; 
    function __construct() { 
     $this->key = "edrtjfjfjlldldld"; 
     $this->iv = "56666852251557009888889955123458"; 
    } 
    function encrypt($text) { 

     $block = mcrypt_get_block_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_CBC); 
     $padding = $block - (strlen($text) % $block); 
     $text .= str_repeat(chr($padding), $padding); 
     $crypttext = mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $this->key, $text, MCRYPT_MODE_CBC, $this->iv); 

     return base64_encode($crypttext); 
    } 

    function decrypt($input) { 
     $dectext = mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $this->key, base64_decode($input), MCRYPT_MODE_CBC, $this->iv); 
     return $dectext; 
    } 
} 

加密/解密中使用C＃：

public class RijndaelSimple 
    { 
     const string iv = "56666852251557009888889955123458"; 
     const string key = "edrtjfjfjlldldld"; 

     static public String EncryptRJ256(string plainText) 
     { 
      var encoding = new UTF8Encoding(); 
      var Key = encoding.GetBytes(key); 
      var IV = encoding.GetBytes(iv); 
      byte[] encrypted; 

      using (var rj = new RijndaelManaged()) 
      { 
       try 
       { 
        rj.Padding = PaddingMode.PKCS7; 
        rj.Mode = CipherMode.CBC; 
        rj.KeySize = 256; 
        rj.BlockSize = 256; 
        rj.Key = Key; 
        rj.IV = IV; 

        var ms = new MemoryStream(); 

        using (var cs = new CryptoStream(ms, rj.CreateEncryptor(Key, IV), CryptoStreamMode.Write)) 
        { 
         using (var sr = new StreamWriter(cs)) 
         { 
          sr.Write(plainText); 
         } 
         encrypted = ms.ToArray(); 
        } 
       } 
       finally 
       { 
        rj.Clear(); 
       } 
      } 

      return Convert.ToBase64String(encrypted); 
     } 

     static public String DecryptRJ256(string input) 
     { 
      byte[] cypher = Convert.FromBase64String(input); 

      var sRet = ""; 

      var encoding = new UTF8Encoding(); 
      var Key = encoding.GetBytes(key); 
      var IV = encoding.GetBytes(iv); 

      using (var rj = new RijndaelManaged()) 
      { 
       try 
       { 
        rj.Padding = PaddingMode.PKCS7; 
        rj.Mode = CipherMode.CBC; 
        rj.KeySize = 256; 
        rj.BlockSize = 256; 
        rj.Key = Key; 
        rj.IV = IV; 
        var ms = new MemoryStream(cypher); 

        using (var cs = new CryptoStream(ms, rj.CreateDecryptor(Key, IV), CryptoStreamMode.Read)) 
        { 
         using (var sr = new StreamReader(cs)) 
         { 
          sRet = sr.ReadLine(); 
         } 
        } 
       } 
       finally 
       { 
        rj.Clear(); 
       } 
      } 

      return sRet; 
     } 

    }