IMPLEMENTATION OF MD5 ALGORITHM using Java

AIM:

To write a program in java to  calculate the message digest of a text using the MD-5.

ALGORITHM:

Step1: Append padding bits to the input plain text

Step2: Append length

Step3: Initialize MD buffer

Step4: Process message in 512-bit(16word)blocks

Step5: Display the hashed text.

PROGRAM:

import java.io.FileInputStream;

import java.io.UnsupportedEncodingException;

importjava.math.BigInteger;

import java.security.MessageDigest;

import java.security.NoSuchAlgorithmException;

public class MD5 {

    public static String getMD5(String input) {

        try {

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

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

BigInteger number = new BigInteger(1, messageDigest);

            String hashtext = number.toString(16);

            // Now we need to zero pad it if you actually want the full 32 chars.

while (hashtext.length() < 32) {

hashtext = "0" + hashtext;

            }

            return hashtext;

        }

        catch (NoSuchAlgorithmException e) {

            throw new RuntimeException(e);

        }

    }

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

System.out.println(getMD5("hai"));

    }

}

OUTPUT: