Multiple tries to authenticate

[davyvr]

Hi there,

I have a bit of a problem with authentication. I want my program to find out if a card has the default authentication key as KeyB (called KeyDefault in my software) or a key I made myself (KeyPrivate). So I want to try both authentications, and if default rewrite the authentication. For this I made this function:

Serial.println("Logging in to RFID tag ..."); byte TagType = mfrc522.PICC_GetType(mfrc522.uid.sak); if (TagType != MFRC522::PICC_TYPE_MIFARE_1K) { Serial.println("Wrong tag type! Use MiFare 1k tags"); Serial.println(""); return false; }

byte status = mfrc522.PCD_Authenticate(MFRC522::PICC_CMD_MF_AUTH_KEY_A, trailerBlock, &KeyDefault, &(mfrc522.uid)); if (status!= MFRC522::STATUS_OK) { Serial.println("Tag security key A corrupt, throw away!"); Serial.println(""); return false; }

status = mfrc522.PCD_Authenticate(MFRC522::PICC_CMD_MF_AUTH_KEY_B, trailerBlock, &KeyDefault, &(mfrc522.uid)); if (status!= MFRC522::STATUS_OK) { mfrc522.PCD_StopCrypto1(); status = mfrc522.PCD_Authenticate(MFRC522::PICC_CMD_MF_AUTH_KEY_B, trailerBlock, &KeyPrivate, &(mfrc522.uid)); if (status!= MFRC522::STATUS_OK) { mfrc522.PCD_StopCrypto1(); Serial.println("Tag security key B corrupt, throw away!"); Serial.println(""); return false; } else { SetAccess = false; return true; } } else { SetAccess = true; return true; }

The problem is: PICC_CMD_MF_AUTH_KEY_B doesn't work if KEYB is equal to KeyPrivate. If I switch both places (KeyDefault & KeyPrivate) then it works. So the first time I try to authenticate KeyB works, but the second time doesn't. How can I try two different keys for KeyB? Am I making a syntax error or forgetting something?

Kind regards, Davy Van Rossem

[norbertoramos]

Hi I solve the problem calling // Reinicia la tarjeta mfrc522.PICC_IsNewCardPresent(); mfrc522.PICC_ReadCardSerial();
After each try. Regards

[mdxs]

@davyvr Is this still a problem for you (after trying the solution proposed by @norbertoramos)? Otherwise, I think this ticket should be closed.

[mdxs]

Can be closed, no response must mean all is fine.