public static ECIESUnprocessResult unprocessMessage(string key, string tag, string message)
{
byte[] sharedKey = Encoding.ASCII.GetBytes(key);
byte[] Kenc = KDF.DeriveKey(sharedKey, KDF.DefaultRoundsEnc);
byte[] Kmac = KDF.DeriveKey(sharedKey, KDF.DefaultRoundsMac);
AesEncryptionProvider aes = new AesEncryptionProvider(Kenc);
byte[] tagByte = Encoding.ASCII.GetBytes(tag);
byte[] messageByte = Encoding.ASCII.GetBytes(message);
if (MAC.VerifyTag(tagByte, Kmac))
{
return new()
{
DeprocessedMessage = aes.Decrypt(messageByte, Kenc),
Status = MyEnum.Successful
}
}
;
else
{
return new()
{
DeprocessedMessage = "",
Status = MyEnum.Fail
}
};
}
}