public static string Decrypt(byte[] encryptedData, string sharedKey, byte[] salt)
{
var aesData = encryptedData;
var password = Encoding.UTF8.GetBytes(sharedKey);
var md5 = MD5.Create();
var preKeyLength = password.Length + salt.Length;
var preKey = new byte[preKeyLength];
Buffer.BlockCopy(password, 0, preKey, 0, password.Length);
Buffer.BlockCopy(salt, 0, preKey, password.Length, salt.Length);
var key = md5.ComputeHash(preKey);
var preIVLength = key.Length + preKeyLength;
var preIV = new byte[preIVLength];
Buffer.BlockCopy(key, 0, preIV, 0, key.Length);
Buffer.BlockCopy(preKey, 0, preIV, key.Length, preKey.Length);
var iv = md5.ComputeHash(preIV);
md5.Clear();
// Decrypt using AES
var rijndael = new RijndaelManaged
{
Mode = CipherMode.CBC,
Padding = PaddingMode.None,
KeySize = 128,
BlockSize = 128,
};
var rijndaelDecryptor = rijndael.CreateDecryptor(key, iv);
var clearData = rijndaelDecryptor.TransformFinalBlock(aesData, 0, aesData.Length);
var clearText = new ASCIIEncoding().GetString(clearData);
////When decrypted it comes back with a new line character at the end, whcih it gets rid of
return clearText.SplitOnNewLine().First();
}
