How to decrypt C# code in php

[Dinesh Pise]

Hi friends,

I have written code C# for encryption using Rijndael algorithm.Now i want to decrypt it in php. I tried for that but not getting exact string which i encrypted.
Below is the encryption code for C#.

 
public string Encrypt(string textToBeEncrypted, string Password) 
    { 

        RijndaelManaged RijndaelCipher = new RijndaelManaged(); 
        ICryptoTransform Encryptor = null; 
        byte[] plainText = null; 
        try 
        { 
            byte[] Salt = Encoding.ASCII.GetBytes(Password.Length.ToString()); 
            PasswordDeriveBytes SecretKey = new PasswordDeriveBytes(Password, Salt); 
            //Creates a symmetric encryptor object. 
            Encryptor = RijndaelCipher.CreateEncryptor(SecretKey.GetBytes(32), SecretKey.GetBytes(16)); 
            plainText = Encoding.Unicode.GetBytes(textToBeEncrypted); 


        } 
        catch (Exception ex) 
        { 
            string str = "Method Name: " + MethodBase.GetCurrentMethod().Name + " | Description: " + ex.Message + ex.InnerException; 
            log.Error(str); 

        } 
        return Convert.ToBase64String(Encryptor.TransformFinalBlock(plainText, 0, plainText.Length)); 

    } 

Decryption code in php is

function decryptData($value){ 
$key = "same key used in above c# code"; 
   $crypttext = $value; 
   $iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB); 
   $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND); 
   $decrypttext = mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $key, $crypttext, MCRYPT_MODE_ECB, $iv); 
   return trim($decrypttext); 
}

Using above php code ,I am not getting original value. Kindly advice.....

Regards,
Dinesh Pise

[Nick Charles]

I would first verify that a specific plain text string gets encrypted to the exact same encrypted and encoded string in both environments. If not, then the algorithms are not compatible (perhaps due to differences in interpretation of the algorithm, or perhaps in one group 'tweaking' the algorithm to 'make it better'). If the encoded strings are not the same, you will have to try other algorithms until you find one that generates the same encoded string on both platforms.