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;
  
  import at.o2xfs.common.Bytes;
  
  public class PINBlock {
  
  	private static final int FILLER = 0xF;
  
  	private final byte[] pinBlock = new byte[8];
  
  	private final String pin;
  
  	private int pinIndex = 0;
  
  	public PINBlock(String pin) {
  		this.pin = pin;
  		create();
  	}
  
  	private void create() {
  		pinBlock[0] = 0x02 << 4;
  		pinBlock[0] |= (byte) pin.length();
  		for (int i = 1; i < pinBlock.length; i++) {
  			pinBlock[i] = (byte) (nextInt() << 4);
  			pinBlock[i] |= nextInt();
  		}
  	}
  
  	private int nextInt() {
  		if (pinIndex < pin.length()) {
  			return toInt(pin.charAt(pinIndex++));
  		}
  		return FILLER;
  	}
  
  	private int toInt(char c) {
  		return c - 48;
  	}
  
  	public byte[] getPINBlock() {
  		return Bytes.copy(pinBlock);
  	}
  }