# Cryptography Tutorials - Tutorial Addendum - Bulletin Abstract - MD5 Algorithm

31 December 18:00

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Step 5. Output. The capacity in absorber words A, B, C, D are alternate in arrangement with

low-order byte first.

MD5 Accomplishing in Java

Sun provides MD5 algorithm in Java beneath their JCE ( Java Cryptography Extension) package,

which is included in JDK 1.5.

Sun s accomplishing of MD5 can be accessed through a all-encompassing chic alleged MessageDigest.

Here are the capital methods of MessageDigest class:

• getInstance("MD5") - Allotment a bulletin abstract item represents a specific accomplishing

of MD5 algorithm from the absence provider, Sun.

•

• getProvider() - Allotment the provider name of the accepted object.

•

• update(bytes) - Updates the ascribe bulletin by appending a byte arrangement at the end.

•

• digest() - Performs MD5 algorithm on the accepted ascribe bulletin and allotment the bulletin digest

as a byte array. This adjustment aswell resets the ascribe bulletin to an abandoned byte string.

•

• reset() - Resets the ascribe bulletin to an abandoned byte string.

•

Here is a sample Java program to appearance you how to use the MessageDigest chic to accomplish some tests

on MD5 algorithms.

`     /**     * JceMd5Test.java     * Absorb (c) 2006 by Dr.  Yang, http://www.yang.com/     */    import java.security.*;    class JceMd5Test {       accessible changeless abandoned main(String[] a) {          try {             MessageDigest md = MessageDigest.getInstance("MD5");             System.out.println("Message abstract item info: ");             System.out.println("   Algorithm = "+md.getAlgorithm());             System.out.println("   Provider = "+md.getProvider());             System.out.println("   toString = "+md.toString());             Cord ascribe = "";             md.update(input.getBytes());           	 byte[] achievement = md.digest();             System.out.println();             System.out.println("MD5(""+input+"") =");             System.out.println("   "+bytesToHex(output));             ascribe = "abc";             md.update(input.getBytes());           	 achievement = md.digest();             System.out.println();             System.out.println("MD5(""+input+"") =");             System.out.println("   "+bytesToHex(output));             ascribe = "abcdefghijklmnopqrstuvwxyz";             md.update(input.getBytes());           	 achievement = md.digest();             System.out.println();             System.out.println("MD5(""+input+"") =");             System.out.println("   "+bytesToHex(output));                       } bolt (Exception e) {             System.out.println("Exception: "+e);          }       }       accessible changeless Cord bytesToHex(byte[] b) {          burn hexDigit[] = { 0 ,  1 ,  2 ,  3 ,  4 ,  5 ,  6 ,  7 ,                              8 ,  9 ,  A ,  B ,  C ,  D ,  E ,  F };          StringBuffer buf = new StringBuffer();          for (int j=0; j<b.length; j++) {             buf.append(hexDigit[(b[j] >> 4) & 0x0f]);             buf.append(hexDigit[b[j] & 0x0f]);          }          acknowledgment buf.toString();       }    }    `

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