/// <summary>
/// Decrypt data IV + DATA with given key
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="encryptedText"></param>
/// <param name="Key"></param>
/// <returns></returns>
public static string Decrypt <T>(string encryptedText, string Key) where T : SymmetricAlgorithm, new()
{
AesCryptoServiceProvider aesCryptoServiceProvider = new AesCryptoServiceProvider();
byte[] IV = new byte[aesCryptoServiceProvider.BlockSize / 8];
string plainTest;
byte[] ciperData = Convert.FromBase64String(encryptedText);
byte[] ciperText = GCM.SubArray(ciperData, IV.Length, ciperData.Length - IV.Length);
using (T cipher = new T())
{
cipher.Key = System.Convert.FromBase64String(Key);
cipher.IV = GCM.SubArray(ciperData, 0, IV.Length);
cipher.Mode = CipherMode.CBC;
ICryptoTransform decryptor = cipher.CreateDecryptor(cipher.Key, cipher.IV);
using (MemoryStream ms = new MemoryStream(ciperText))
{
using (CryptoStream cs = new CryptoStream(ms, decryptor, CryptoStreamMode.Read))
{
using (StreamReader sr = new StreamReader(cs))
{
plainTest = sr.ReadToEnd();
}
}
}
}
return(plainTest);
}
/// <summary>
/// Return encrypted data IV + Data
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="plainText"></param>
/// <param name="Key"></param>
/// <param name="IV"></param>
/// <returns></returns>
public static string Encrypt <T>(string plainText, string Key, string IV) where T : SymmetricAlgorithm, new()
{
byte[] encrypted;
byte[] encryptedData;
using (T cipher = new T())
{
cipher.Key = System.Convert.FromBase64String(Key);
cipher.IV = System.Convert.FromBase64String(IV);
cipher.Mode = CipherMode.CBC;
ICryptoTransform encryptor = cipher.CreateEncryptor(cipher.Key, cipher.IV);
using (MemoryStream ms = new MemoryStream())
{
using (CryptoStream cs = new CryptoStream(ms, encryptor, CryptoStreamMode.Write))
{
using (StreamWriter sw = new StreamWriter(cs))
{
sw.Write(plainText);
}
encrypted = ms.ToArray();
}
}
encryptedData = GCM.Concat(cipher.IV, encrypted);
}
return(Convert.ToBase64String(encryptedData));;
}
