public static byte[] Decrypt(byte[] cipher, byte[] nonce, byte[] key, byte[] additionalData = null)
{
if (additionalData == null)
{
additionalData = new byte[0];
}
if (key == null || key.Length != 32)
{
throw new KeyOutOfRangeException("key", (key == null) ? 0 : key.Length, string.Format("key must be {0} bytes in length.", 32));
}
if (nonce == null || nonce.Length != 12)
{
throw new NonceOutOfRangeException("nonce", (nonce == null) ? 0 : nonce.Length, string.Format("nonce must be {0} bytes in length.", 12));
}
if (additionalData.Length > 16 || additionalData.Length < 0)
{
throw new AdditionalDataOutOfRangeException(string.Format("additionalData must be between {0} and {1} bytes in length.", 0, 16));
}
byte[] array = new byte[cipher.Length - 16];
IntPtr intPtr = Marshal.AllocHGlobal(array.Length);
long num;
bool arg_DC_0 = SodiumLibrary.crypto_aead_aes256gcm_decrypt(intPtr, out num, null, cipher, (long)cipher.Length, additionalData, (long)additionalData.Length, nonce, key) != 0;
Marshal.Copy(intPtr, array, 0, (int)num);
Marshal.FreeHGlobal(intPtr);
if (arg_DC_0)
{
throw new CryptographicException("Error decrypting message.");
}
if ((long)array.Length == num)
{
return(array);
}
byte[] array2 = new byte[num];
Array.Copy(array, 0L, array2, 0L, num);
return(array2);
}