package cn.sunzn.md5;

import java.security.MessageDigest;

import java.security.NoSuchAlgorithmException;

public class Str2MD5 {

    public static void main(String[] args) {

        MD5("sunzn");

    }

    private static String MD5(String sourceStr) {

        String result = "";

        try {

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

            md.update(sourceStr.getBytes());

            byte b[] = md.digest();

            int i;

            StringBuffer buf = new StringBuffer("");

            for (int offset = 0; offset < b.length; offset++) {

                i = b[offset];

                if (i < 0)

                    i += 256;

                if (i < 16)

                    buf.append("0");

                buf.append(Integer.toHexString(i));

            }

            result = buf.toString();

            System.out.println("MD5(" + sourceStr + ",32) = " + result);

            System.out.println("MD5(" + sourceStr + ",16) = " + buf.toString().substring(8, 24));

        } catch (NoSuchAlgorithmException e) {

            System.out.println(e);

        }

        return result;

    }

}

MD5(sunzn,32) = 40379db889f9124819228947faaeb1f7

MD5(sunzn,16) = 89f9124819228947