calculate MD5 checksum for a file

"Steve" <>
6 May 2006 10:20:36 -0700
I want to write a java program to calculate MD5 checksum for a tomcat
file downloaded from apache's site:

0bb2827c5eacf570b6064e24e0e6653b *apache-tomcat-5.5.17.exe

Here's the code I wrote, but I got the result
740171421a803f50dd573fd38b469a9b, which is different from the one in
tomcat's site. I am using the hex result.

byte[] b = createChecksum(args[0]);
for (int i=0; i<b.length; i++)
   String s = Integer.toString( ( b[i] & 0xff ) + 0x100, 16 /* radix */
).substring( 1 );

   public static byte[] createChecksum(String filename) throws
     InputStream fis = new FileInputStream(filename);

     byte[] buffer = new byte[1024];
     MessageDigest complete = MessageDigest.getInstance("MD5");
     int numRead;
     do {
      numRead =;
      if (numRead > 0) {
        complete.update(buffer, 0, numRead);
      } while (numRead != -1);
     return complete.digest();

Any ideas why? please advise.


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