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PONo response from MIFARE CLASSIC
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copied!<p>I'm trying to authenticate any sector of a MIFARE classic card. I'm using a twinlinx mymax sticker (which makes almost any bluetooth device NFC enabled). It sends commands to a connected NFC tag. I've already made a connection and sent and recieved data with a Ultralight C tag, but so far I had no success on accessing a Mifare Classic. Here is my authentication code:</p> <pre><code> private boolean authenticate(int sector, byte[] key, boolean keyA) { byte[] cmd = new byte[12]; // First byte is the command if (keyA) { cmd[0] = 0x60; // phHal_eMifareAuthentA } else { cmd[0] = 0x61; // phHal_eMifareAuthentB } // Second byte is block address cmd[1] = (byte) 0x03; // Next 6 bytes are the key System.arraycopy(key, 0, cmd, 2, 6); // Next 4 bytes is the UID System.arraycopy(Answer, 3, cmd, 8,4); byte[] test = null; //this makes a connection to the NFC tag (and this works) TR.ConnectToExternalCard(AUTH, (byte)0x00); //checking if the tag is still connected if (TR.isCardPresent() == true){ //sending command to authenticate test = TR.SendCommandPropAndWaitResponse(cmd, (byte) 0x00); } try { if (test != null) { return true; } } </code></pre> <p>I'm using standard MIFARE Classic keys, the tags are fresh from the factory. The complete command (in bytes) which is sent to the tag is:</p> <p>[0x60, 0x3, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf3, 0xf4, 0xa9, 0xfb]</p> <p>Any Ideas? The tag seems to be non-responsive... tried accessing other Classic tags but also had no success. Thanks!</p>

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