Java Code Examples for javacard.framework.OwnerPIN#update()

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Example 1
Source File: CardEdge.java    From SatochipApplet with GNU Affero General Public License v3.0 4 votes vote down vote up 
/** 
 * This function changes a PIN code. The DATA portion contains both the old and
 * the new PIN codes. 
 * 
 * ins: 0x44
 * p1: PIN number (0x00-0x07)
 * p2: 0x00
 * data: [PIN_size(1b) | old_PIN | PIN_size(1b) | new_PIN ] 
 * return: none (throws an exception in case of wrong PIN)
 */
private short ChangePIN(APDU apdu, byte[] buffer) {
	/*
	 * Here I suppose the PIN code is small enough that 2 of them enter in
	 * the buffer TODO: Verify the assumption and eventually adjust code to
	 * support reading PINs in multiple read()s
	 */
	byte pin_nb = buffer[ISO7816.OFFSET_P1];
	if ((pin_nb < 0) || (pin_nb >= MAX_NUM_PINS))
		ISOException.throwIt(SW_INCORRECT_P1);
	OwnerPIN pin = pins[pin_nb];
	if (pin == null)
		ISOException.throwIt(SW_INCORRECT_P1);
	if (buffer[ISO7816.OFFSET_P2] != (byte) 0x00)
		ISOException.throwIt(SW_INCORRECT_P2);
	short bytesLeft = Util.makeShort((byte) 0x00, buffer[ISO7816.OFFSET_LC]);
	// At least 1 character for each PIN code
	if (bytesLeft < 4)
		ISOException.throwIt(SW_INVALID_PARAMETER);
	byte pin_size = buffer[ISO7816.OFFSET_CDATA];
	if (bytesLeft < (short) (1 + pin_size + 1))
		ISOException.throwIt(SW_INVALID_PARAMETER);
	if (!CheckPINPolicy(buffer, (short) (ISO7816.OFFSET_CDATA + 1), pin_size))
		ISOException.throwIt(SW_INVALID_PARAMETER);
	byte new_pin_size = buffer[(short) (ISO7816.OFFSET_CDATA + 1 + pin_size)];
	if (bytesLeft < (short) (1 + pin_size + 1 + new_pin_size))
		ISOException.throwIt(SW_INVALID_PARAMETER);
	if (!CheckPINPolicy(buffer, (short) (ISO7816.OFFSET_CDATA + 1 + pin_size + 1), new_pin_size))
		ISOException.throwIt(SW_INVALID_PARAMETER);
	
	byte triesRemaining	= pin.getTriesRemaining();
	if (triesRemaining == (byte) 0x00)
		ISOException.throwIt(SW_IDENTITY_BLOCKED);
	if (!pin.check(buffer, (short) (ISO7816.OFFSET_CDATA + 1), pin_size)) {
		LogoutIdentity(pin_nb);
		ISOException.throwIt((short)(SW_PIN_FAILED + triesRemaining - 1));
	}
	
	pin.update(buffer, (short) (ISO7816.OFFSET_CDATA + 1 + pin_size + 1), new_pin_size);
	// JC specifies this resets the validated flag. So we do.
	logged_ids &= (short) ((short) 0xFFFF ^ (0x01 << pin_nb));
	
	return (short)0;
}