MD5&SHA加密util类（Java）

 MD5&SHA加密util类（Java）

 package com.arui.util;
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
 public class EncryptUtils {
     /**
      * Encrypt string using MD5 algorithm
      */
     public final static String encryptMD5(String source) {
         if (source == null) {
             source = "";
         }
         String result = "";
         try {
             result = encrypt(source, "MD5");
         } catch (NoSuchAlgorithmException ex) {
             // this should never happen
             throw new RuntimeException(ex);
         }
         return result;
     }
     /**
      * Encrypt string using SHA algorithm
      */
     public final static String encryptSHA(String source) {
         if (source == null) {
             source = "";
         }
         String result = "";
         try {
             result = encrypt(source, "SHA");
         } catch (NoSuchAlgorithmException ex) {
             // this should never happen
             throw new RuntimeException(ex);
         }
         return result;
     }
     /**
      * Encrypt string
      */
     private final static String encrypt(String source, String algorithm)
             throws NoSuchAlgorithmException {
         byte[] resByteArray = encrypt(source.getBytes(), algorithm);
         return toHexString(resByteArray);
     }
     /**
      * Encrypt byte array.
      */
     private final static byte[] encrypt(byte[] source, String algorithm)
             throws NoSuchAlgorithmException {
         MessageDigest md = MessageDigest.getInstance(algorithm);
         md.reset();
         md.update(source);
         return md.digest();
     }
     /**
      * Get hex string from byte array
      */
     private final static String toHexString(byte[] res) {
         StringBuffer sb = new StringBuffer(res.length << 1);
         for (int i = 0; i < res.length; i++) {
             String digit = Integer.toHexString(0xFF & res[i]);
             if (digit.length() == 1) {
                 digit = '0' + digit;
             }
             sb.append(digit);
         }
         return sb.toString().toUpperCase();
     }
 }

 

原文链接： http://blog.csdn.net/arui319/article/details/5771804