Sha1Bean.java

package gov.nist.registry.common2.io;

import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;
import java.io.File;
import java.io.InputStream;
import java.security.MessageDigest;

import javax.activation.DataHandler;
import javax.activation.FileDataSource;

public class Sha1Bean {

    public static final String PROP_SAMPLE_PROPERTY = "sampleProperty";
    
    private PropertyChangeSupport propertySupport;
    
    /**
     * Holds value of property byteStream.
     */
    private byte[] byteStream;
    
    public Sha1Bean() {
        propertySupport = new PropertyChangeSupport(this);
    }
    
    
    public void addPropertyChangeListener(PropertyChangeListener listener) {
        propertySupport.addPropertyChangeListener(listener);
    }
    
    public void removePropertyChangeListener(PropertyChangeListener listener) {
        propertySupport.removePropertyChangeListener(listener);
    }
    
    /**
     * Setter for property byteStream.
     * @param byteStream New value of property byteStream.
     */
    public void setByteStream(byte[] byteStream) {
        this.byteStream = byteStream;
    }
    
    /**
     * Getter for property sha1.
     * @return Value of property sha1.
     */
    public byte[] getSha1() throws Exception {
        if (byteStream == null)
            throw new Exception("Sha1Bean:getSha1: byteStream is null");
        MessageDigest md = null;
        try { md = MessageDigest.getInstance("SHA1"); }
        catch(Exception e) {}
        byte[] result = md.digest(byteStream);
        return result;
    }
    
    /**
     * Getter for property sha1String.
     * @return Value of property sha1String.
     */
    public String getSha1String() throws Exception {
        byte[] sha1 = getSha1();
        StringBuffer buf = new StringBuffer();
        for(int i=0; i<sha1.length; i++) {
            String h = Integer.toHexString(sha1[i] & 0xff);
            if(h.length() == 1) h = "0" + h;
            buf.append(h);
        }
        return new String(buf);
    }
    
    public String getSha1File(File input) throws Exception {
		javax.activation.DataHandler dataHandler = new javax.activation.DataHandler(new FileDataSource(input));
		InputStream is = dataHandler.getInputStream();
		int file_length = (int) input.length();
		byte[] inb = new byte[file_length];
		is.read(inb);
        setByteStream(inb);
        return getSha1String();
    }
    
    public String getSha1(DataHandler dataHandler, int size) throws Exception {
		InputStream is = dataHandler.getInputStream();
		byte[] inb = new byte[size];
		is.read(inb);
        setByteStream(inb);
        return getSha1String();
    }
    
    // SHA1 of Jelani Nelson is:
    // 35 75 fe eb 4c 2f d2 f5 b5 e0 b1 8d ae 06 15 9e 28 9e 73 ad 
    
    public static void main(String[] argv) throws Exception {
        
//        String in = "Jelani Nelson";
//        byte[] inb = in.getBytes();
//        Sha1Bean sb = new Sha1Bean();
//        sb.setByteStream(inb);
//        System.out.println("sha1 of 'Jelani Nelson' is " + sb.getSha1String());
        
        String fin = Io.stringFromFile(new File("/Users/bill/ihe/testing/sha1/utf8ccds/gallowYounger.xml"));
        byte[] inb = fin.getBytes();
        Sha1Bean sb = new Sha1Bean();
        sb.setByteStream(inb);
        System.out.println(sb.getSha1String());

//        fin = Io.stringFromFile(new File("/Users/bill/tmp/hash/rep.txt"));
//        inb = fin.getBytes();
//        sb = new Sha1Bean();
//        sb.setByteStream(inb);
//        System.out.println("sha1 of 'rep.txt' is " + sb.getSha1String());
    }

	
}