JavaʵÏÖMD5¼ÓÃܽâÃÜÀà
	
    
    
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MD5¼ÓÃܽâÃÜÀà——MyMD5Util,´úÂëÈçÏ£º
package com.zyg.security.md5;   
  
import java.io.UnsupportedEncodingException;   
import java.security.MessageDigest;   
import java.security.NoSuchAlgorithmException;   
import java.security.SecureRandom;   
import java.util.Arrays;   
  
public class MyMD5Util {   
       
    private static final String HEX_NUMS_STR="0123456789ABCDEF";   
    private static final Integer SALT_LENGTH = 12;   
       
    /**   
     * ½«16½øÖÆ×Ö·û´®×ª»»³É×Ö½ÚÊý×é   
     * @param hex   
     * @return   
     */  
    public static byte[] hexStringToByte(String hex) {   
        int len = (hex.length() / 2);   
        byte[] result = new byte[len];   
        char[] hexChars = hex.toCharArray();   
        for (int i = 0; i < len; i++) {   
            int pos = i * 2;   
            result[i] = (byte) (HEX_NUMS_STR.indexOf(hexChars[pos]) << 4    
                            | HEX_NUMS_STR.indexOf(hexChars[pos + 1]));   
        }   
        return result;   
    }   
  
       
    /**  
     * ½«Ö¸¶¨byteÊý×éת»»³É16½øÖÆ×Ö·û´®  
     * @param b  
     * @return  
     */  
    public static String byteToHexString(byte[] b) {   
        StringBuffer hexString = new StringBuffer();   
        for (int i = 0; i < b.length; i++) {   
            String hex = Integer.toHexString(b[i] & 0xFF);   
            if (hex.length() == 1) {   
                hex = '0' + hex;   
            }   
            hexString.append(hex.toUpperCase());   
        }   
        return hexString.toString();   
    }   
       
    /**  
     * ÑéÖ¤¿ÚÁîÊÇ·ñºÏ·¨  
     * @param password  
     * @param passwordInDb  
     * @return  
     * @throws NoSuchAlgorithmException  
     * @throws UnsupportedEncodingException  
     */  
    public static boolean validPassword(Str
    
     
	
	
    
    
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