package org.uic.barcode; import java.io.IOException; import java.security.InvalidKeyException; import java.security.NoSuchAlgorithmException; import java.security.PublicKey; import java.security.SignatureException; import java.util.zip.DataFormatException; import org.uic.barcode.dynamicFrame.Constants; import org.uic.barcode.dynamicFrame.DataType; import org.uic.barcode.dynamicFrame.DynamicFrame; import org.uic.barcode.dynamicFrame.Level1DataType; import org.uic.barcode.dynamicFrame.Level2DataType; import org.uic.barcode.dynamicFrame.SequenceOfDataType; import org.uic.barcode.staticFrame.StaticFrame; import org.uic.barcode.staticFrame.UFLEXDataRecord; import org.uic.barcode.staticFrame.UTLAYDataRecord; import org.uic.barcode.staticFrame.ticketLayoutBarcode.TicketLayout; import org.uic.ticket.EncodingFormatException; import org.uic.ticket.UicRailTicketCoder; import org.uic.ticket.api.spec.IUicRailTicket; /** * The Class Decoder. * * signature validation and decoding of UIC bar codes * */ public class Decoder { /** The dynamic frame. */ private DynamicFrame dynamicFrame = null; /** The static frame. */ private StaticFrame staticFrame = null; /** The uic ticket coder. */ private UicRailTicketCoder uicTicketCoder = null; /** The uic ticket. */ private IUicRailTicket uicTicket = null; /** The layout. */ private TicketLayout layout = null; /** The data. */ byte[] data = null; /** * Instantiates a new decoder. * * @param data the data * @throws IOException Signals that an I/O exception has occurred. * @throws EncodingFormatException the encoding format exception * @throws DataFormatException the data format exception */ public Decoder (byte[] data) throws IOException, EncodingFormatException, DataFormatException { this.data = data; decode(data); } /** * Validate level 1. * * @param key the public key * @param signingAlg the signing algorithm OID * @return the return code indicating errors * @throws InvalidKeyException the invalid key exception * @throws NoSuchAlgorithmException the no such algorithm exception * @throws SignatureException the signature exception * @throws IllegalArgumentException the illegal argument exception * @throws UnsupportedOperationException the unsupported operation exception * @throws IOException Signals that an I/O exception has occurred. * @throws EncodingFormatException the encoding format exception */ public int validateLevel1(PublicKey key, String signingAlg) throws InvalidKeyException, NoSuchAlgorithmException, SignatureException, IllegalArgumentException, UnsupportedOperationException, IOException, EncodingFormatException { if (!isStaticHeader(data)) { return dynamicFrame.validateLevel1(key) ; } else { if (staticFrame.verifyByAlgorithmOid(key,signingAlg)) { return Constants.LEVEL1_VALIDATION_OK; } else { return Constants.LEVEL1_VALIDATION_FRAUD; } } } /** * Validate level 2. * * @return the return code indicating errors */ public int validateLevel2() { if (!isStaticHeader(data)) { return dynamicFrame.validateLevel2() ; } else { return Constants.LEVEL2_VALIDATION_NO_SIGNATURE; } } /** * Decode. * * @param data the byte array raw data * @throws IOException Signals that an I/O exception has occurred. * @throws EncodingFormatException the encoding format exception * @throws DataFormatException the data format exception */ public void decode(byte[] data) throws IOException, EncodingFormatException, DataFormatException { if (!isStaticHeader(data)) { dynamicFrame = DynamicFrame.decode(data); Level2DataType level2 = dynamicFrame.getLevel2SignedData(); Level1DataType level1 = level2.getLevel1Data(); SequenceOfDataType dataList = level1.getData(); for (DataType level1Content : dataList) { uicTicketCoder = new UicRailTicketCoder(); if (level1Content.getFormat().equals("FCB1")) { uicTicket = uicTicketCoder.decodeFromAsn(level1Content.getByteData(), 1); } else if (level1Content.getFormat().equals("FCB2")) { uicTicket = uicTicketCoder.decodeFromAsn(level1Content.getByteData(), 2); } } } else if (isStaticHeader(data)){ staticFrame = new StaticFrame(); staticFrame.decode(data); UFLEXDataRecord flex = staticFrame.getuFlex(); if (flex != null) { uicTicket = flex.getTicket(); } UTLAYDataRecord tlay = staticFrame.getuTlay(); if (tlay != null) { layout = tlay.getLayout(); } } } /** * Checks if is static header. * * @param data the data * @return true, if is static header */ private boolean isStaticHeader(byte[] data) { byte[] start = "#UT".getBytes(); if (start[0] != data[0] || start[1]!= start[1] || start[2] != data[2]) return false; return true; } /** * Gets the uic ticket. * * @return the uic ticket */ public IUicRailTicket getUicTicket() { return uicTicket; } /** * Gets the layout. * * @return the layout */ public TicketLayout getLayout() { return layout; } /** * Gets the dynamic header. * * @return the dynamic header */ public DynamicFrame getDynamicHeader() { return dynamicFrame; } /** * Sets the dynamic header. * * @param dynamicHeader the new dynamic header */ public void setDynamicHeader(DynamicFrame dynamicHeader) { this.dynamicFrame = dynamicHeader; } /** * Gets the static frame. * * @return the static frame */ public StaticFrame getStaticFrame() { return staticFrame; } /** * Sets the static frame. * * @param staticFrame the new static frame */ public void setStaticFrame(StaticFrame staticFrame) { this.staticFrame = staticFrame; } public DataType getLevel2Data() { if (!isStaticHeader(data) && dynamicFrame.getLevel2SignedData() != null) { return dynamicFrame.getLevel2SignedData().getLevel2Data(); } return null; } }