SHA|MessageDigest

import java.security.*;

/*
 *  TestEncrypt.javaA
 *  Author: MKing
 *  Last Date: 2005-11-21
 *  Description: A test progrm to encrypt a string using MD5 or SHA-1,etc.
 */

public class TestEncrypt {
   
        public TestEncrypt() {}
       
 public String Encrypt(String strSrc,String encName) {
                //parameter strSrc is a string will be encrypted,
                //parameter encName is the algorithm name will be used.
                //encName dafault to "MD5"
  MessageDigest md=null;
  String strDes=null;

  byte[] bt=strSrc.getBytes();
  try {
                        if (encName==null||encName.equals("")) {
                            encName="MD5";
                        }
   md=MessageDigest.getInstance(encName);
   md.update(bt);
                        strDes=bytes2Hex(md.digest());  //to HexString
  }
  catch (NoSuchAlgorithmException e) {
   System.out.println("Invalid algorithm.");
   return null;
  }
                return strDes;
 }

        public String bytes2Hex(byte[]bts) {
         String des="";
         String tmp=null;
         for (int i=0;i<bts.length;i++) {
                    tmp=(Integer.toHexString(bts[i] & 0xFF));
                    if (tmp.length()==1) {
                        des+="0";
                    }
                    des+=tmp;
                }
                return des;
        }
       
        public static void main(String[]args) {
            TestEncrypt te=new TestEncrypt();
            String strSrc="可以加密汉字.Oh,and english";
            System.out.println("Source String:"+strSrc);
            System.out.println("Encrypted String:");
            System.out.println("Use Def:"+te.Encrypt(strSrc,null));
            System.out.println("Use MD5:"+te.Encrypt(strSrc,"MD5"));
            System.out.println("Use SHA:"+te.Encrypt(strSrc,"SHA-1"));
            System.out.println("Use SHA-256:"+te.Encrypt(strSrc,"SHA-256"));
        }
}