MD5 Hash in Java

 Hello Guys , 

    In Cryptography, MD5 widely used in Cryptographic hash function. MD5 produces a hash 128 bit.

The MD5 Stands for Message Digest.MD5 is Hashing algorithm is a cryptographic function that accepts a message of any length as input and returns as output a fixed-length digest value to be used for authentica- ting original message.

The MD5 function was originally designed for use a secure cryptographic function for authenticating Digital Signature.

Message Digest Class :

• To calculate cryptographic hashing value in Java, MessageDigest Class is used, under the package java.security.

• MessageDigest Class provides following cryptographic hash function to find hash value of a text, they are:

                  MD5

                  SHA-1

                  SHA-256

This Algorithms are initialized in static method called getInstance(). After selecting the algorithm it calculate the digest value and the return the results in byte array.

MD5 PROGRAM :

import java.io.*;

import java.util.*;

import java.math.BigInteger;

import java.security.MessageDigest;

import java.security.NoSuchAlgorithmException;

// Java Program to calculate MD5 hash value;

public class MD5{

  

      public static String getMD5(String input)

      {

          try {

                 // Static getinstance function is called hashing MD5

               

                 MessageDigest md = MessageDigest.getInstance("MD5");

               

                 // digest function called calculate message digest

                 // of input digest() and return to array of byte

               

                 byte [] messageDigest = md.digest(input.getBytes());

               

                 // Convert byte array into signum representation

               

                  BigInteger no = new BigInteger(1 , messageDigest);

               

                  // Convert message digest into hex value

               

                  String hashtext = no.toString(16);

                  while (hashtext.length() < 32 ){

                     hashtext = "0" + hashtext;

                  }

               

                   return hashtext;

                }

            // For Specifying wrong ,message digest algorithms

             catch(NoSuchAlgorithmException e){

                  throw new RuntimeException(e);

                }

                

      }

    public static void main(String args[])throws NoSuchAlgorithmException

    {

        System.out.print("Enter the word :");   

        Scanner scan = new Scanner(System.in);

        String s = scan.next();

        System.out.println(s+ " : " + getMD5(s));

    }

}   

Output :

Enter the word :infopsh

infopsh : 1d876a8c50f765b3ff69f5e0eede653a

Enter the word :Ps_Info

Ps_Info : 6ac274128ea03a0560266aeef7253b71

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