SHA1散列

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class SHA1 {
     public String Encrypt(String strSrc) {
           MessageDigest md = null;
           String strDes = null;

            byte[] bt = strSrc.getBytes();
            try {

                md = MessageDigest. getInstance("SHA-1");
                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) {
           SHA1 te = new SHA1();
           String strSrc = "abcd";
           System. out.println( "Use SHA:" + te.Encrypt(strSrc).toUpperCase());
     }
}