content: /*
   * Copyright (c) 2017, Andreas Fagschlunger. All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   *   - Redistributions of source code must retain the above copyright
   *     notice, this list of conditions and the following disclaimer.
   *
   *   - Redistributions in binary form must reproduce the above copyright
   *     notice, this list of conditions and the following disclaimer in the
   *     documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
   * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
   * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
   * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
   * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
   * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
   * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  package at.o2xfs.emv.cvm.impl;
  
  import java.io.IOException;
  
  import at.o2xfs.emv.EMVTag;
  import at.o2xfs.emv.EMVTransaction;
  import at.o2xfs.emv.ProcessingState;
  import at.o2xfs.emv.ProcessingStateException;
  import at.o2xfs.emv.TVR;
  import at.o2xfs.emv.cvm.CVMResult;
  import at.o2xfs.emv.cvm.CVMethod;
  import at.o2xfs.emv.cvm.PINEnciphermentException;
  import at.o2xfs.emv.icc.CAPDU;
  import at.o2xfs.emv.icc.GetDataCommand;
  import at.o2xfs.emv.icc.RAPDU;
  import at.o2xfs.emv.icc.VerifyCommand;
  import at.o2xfs.emv.tlv.TLV;
  import at.o2xfs.emv.util.BinaryNumber;
  import at.o2xfs.log.Logger;
  import at.o2xfs.log.LoggerFactory;
  
  abstract class OfflinePINCVMethod implements CVMethod {
  
  	private static final Logger LOG = LoggerFactory
  			.getLogger(OfflinePINCVMethod.class);
  
  	protected EMVTransaction transaction = null;
  
  	@Override
  	public final CVMResult perform(EMVTransaction transaction) {
  		this.transaction = transaction;
  		return doPerform();
  	}
  
  	protected abstract CVMResult doPerform();
  
  	protected void checkPINTryCounter() throws PINEnciphermentException {
  		final String method = "checkPINTryCounter()";
  		CAPDU command = GetDataCommand.create(EMVTag.PIN_TRY_COUNTER.getTag());
  		try {
  			RAPDU response = transaction.getICReader().transmit(command);
  			new ProcessingState(response.getSW()).assertSuccessful();
  			int ptc = BinaryNumber.toInt(TLV.parse(response.getData())
  					.getValue());
  			if (LOG.isInfoEnabled()) {
  				LOG.info(method, "PTC: " + ptc);
  			}
  			if (ptc == 0) {
  				TVR tvr = transaction.getTVR();
  				tvr.getByte3().pinTryLimitExceeded();
  				throw new PINEnciphermentException("PTC is 0");
  			}
  		} catch (ProcessingStateException e) {
  			if (LOG.isErrorEnabled()) {
  				LOG.error(method, "Get PTC failed", e);
  			}
  		} catch (IOException e) {
  			if (LOG.isErrorEnabled()) {
  				LOG.error(method, "Get PTC failed", e);
  			}
  		}
  	}
  
  	protected void verify(int p2, byte[] pinData)
  			throws PINEnciphermentException {
  		try {
  			CAPDU command = new VerifyCommand(p2, pinData);
  			RAPDU response = transaction.getICReader().transmit(command);
  			new ProcessingState(response.getSW()).assertSuccessful();
  		} catch (ProcessingStateException e) {
  			checkPINTryLimit(e.getSW());
  			throw new PINEnciphermentException(e);
  		} catch (IOException e) {
  			throw new PINEnciphermentException(e);
  		}
  	}
  
  	private void checkPINTryLimit(int sw) {
  		final String method = "checkPINTryLimit(int)";
  		boolean exceeded = false;
  		if (sw == 0x6983 || sw == 0x6984) {
  			exceeded = true;
  		} else if ((sw & 0x63C0) == 0x63C0) {
  			int ptc = sw & 0x0F;
  			if (LOG.isInfoEnabled()) {
  				LOG.info(method, "New PTC: " + ptc);
  			}
  			exceeded = ptc == 0;
  		}
  		if (exceeded) {
  			TVR tvr = transaction.getTVR();
  			tvr.getByte3().pinTryLimitExceeded();
  		}
  	}
  }