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Merge pull request #244 from surr/auth

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Authenticate devices with long uids
This commit is contained in:
Rotzbua
2016-10-31 12:46:39 +01:00
committed by GitHub
parent ee94e03906 76adf6e383
commit 82f12a607a
1 changed files with 6 additions and 2 deletions
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8
MFRC522.cpp
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@@ -843,8 +843,12 @@ MFRC522::StatusCode MFRC522::PCD_Authenticate(byte command, ///< PICC_CMD_MF_AU
for (byte i = 0; i < MF_KEY_SIZE; i++) { // 6 key bytes
sendData[2+i] = key->keyByte[i];
}
for (byte i = 0; i < 4; i++) { // The first 4 bytes of the UID
sendData[8+i] = uid->uidByte[i];
// Use the last uid bytes as specified in http://cache.nxp.com/documents/application_note/AN10927.pdf
// section 3.2.5 "MIFARE Classic Authentication".
// The only missed case is the MF1Sxxxx shortcut activation,
// but it requires cascade tag (CT) byte, that is not part of uid.
for (byte i = 0; i < 4; i++) { // The last 4 bytes of the UID
sendData[8+i] = uid->uidByte[i+uid->size-4];
}
// Start the authentication.