public static ECIESUnprocessResult unprocessMessage(string key, string tag, string encryptedMessage)
{
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(encryptedMessage);
if (MAC.VerifyTag(tagByte, Kmac))
{
return new()
{
DeprocessedMessage = aes.Decrypt(messageByte, Kenc),
Status = MyEnum.Successful
}
}
;
else
{
return new()
{
DeprocessedMessage = "",
Status = MyEnum.Fail
}
};
}
}
public static ECIESProcessResult processMessage(string key, 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[] encryptedMessage = aes.Encrypt(message, Kenc);
byte[] signedMessage = MAC.GetTag(encryptedMessage, Kmac);
return(new()
{
Tag = Encoding.ASCII.GetString(signedMessage),
EncryptedMessage = Encoding.ASCII.GetString(encryptedMessage)
});
}