Java Program for Creating Message Digests

by J. Orlin Grabbe

The program listed below, testMD.java:

Java Source Code

testMD.java

import java.io.*;
import java.security.*;
import cryptix.util.core.Hex;
import cryptix.provider.md.*;

class testMD {

public static void main(String[] args) {

try {
     FileOutputStream outFile = new FileOutputStream("MD.out");
     PrintStream output = new PrintStream(outFile);

     byte b;
     String w;

     //SHA-1 Hash value of data 
     MessageDigest sha = MessageDigest.getInstance("SHA-1");

     FileInputStream fis = new FileInputStream(args[0]);
     while (fis.available() != 0) {
         b = (byte) fis.read();
         sha.update(b);
         };

     fis.close();

     byte[] hash = sha.digest();
     w = cryptix.util.core.Hex.dumpString(hash);
     output.println("the SHA-1 hash of " + args[0] + " is " + w);

     // MD5 Hash value of data 
     MessageDigest md5 = MessageDigest.getInstance("MD5");

     fis = new FileInputStream(args[0]);
     while (fis.available() != 0) {
        b = (byte) fis.read();
        md5.update(b);
        };

     fis.close();

     hash = md5.digest();
     w = cryptix.util.core.Hex.dumpString(hash);
     output.println("the MD5 hash of " + args[0] + " is " + w);

     // RIPEM128 Hash value of data 
     MessageDigest rpm128 = MessageDigest.getInstance("RIPEMD128");

     fis = new FileInputStream(args[0]);
     while (fis.available() != 0) {
        b = (byte) fis.read();
        rpm128.update(b);
        };

     fis.close();

     hash = rpm128.digest();
     w = cryptix.util.core.Hex.dumpString(hash);
     output.println("the RIPEM128 hash of " + args[0] + " is " + w);

     // RIPEM160 Hash value of data 
     MessageDigest rpm160 = MessageDigest.getInstance("RIPEMD160");

     fis = new FileInputStream(args[0]);
     while (fis.available() != 0) {
        b = (byte) fis.read();
        rpm160.update(b);
        };

     fis.close();

     hash = rpm160.digest();
     w = cryptix.util.core.Hex.dumpString(hash);
     output.println("the RIPEM160 hash of " + args[0] + " is " + w);

        } catch (Exception e) {
            System.err.println("Caught exception " + e.toString());
        }

     }}

Sample Text Program Input

data

Senator Hand N. Till
Washington, DC

Dear Senator:

This letter is to inform you we have
opened account no. 338907021 on your
behalf, and deposted therein a
legislative incentive payment of
$1 million.  For withdrawl, you will
need to use your password BJRGUD7693.

Yours very truly,

Arnold C. Creole
Vice President
Greater Caribbean Bank

Sample Program Output

MD.out

the SHA-1 hash of data is 1A01B56EB33FA84A 39EEDDD927977726 38331E94

the MD5 hash of data is 5670E64BF6CEBB46 31A25CF6990F82C0 

the RIPEM128 hash of data is B4BB17FD0E09091A 2DF095F0B9647B41 

the RIPEM160 hash of data is ABA54F46348F56D1 E492AE09A472D143 9D64E0F1

J. Orlin Grabbe is the author of International Financial Markets, and is an internationally recognized derivatives expert who has recently branched out into cryptology, banking security, and digital cash. His home page is located at http://www.aci.net/kalliste/homepage.html. He currently resides in Costa Rica.