MD5+Salt值

生成Salt值

package util;

import java.util.Random;

public class Salt {

    public String getSalt()
    {
    Random random = new Random();
    StringBuilder sBuilder = new StringBuilder(16);
    sBuilder.append(random.nextInt(99999999)).append(random.nextInt(99999999));
    int len = sBuilder.length();
    if (len < 16) {
        for (int i = 0; i < 16 - len; i++) {
            sBuilder.append("0");
        }
    }
    String salt = sBuilder.toString();
    return salt;
    }
}

MD5：

package util;

import java.security.MessageDigest;

import org.apache.commons.codec.binary.Hex;

public class MD5 {

    //使用Apache的Hex类实现Hex(16进制字符串和)和字节数组的互转
    private static String md5Hex(String str) {
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            byte[] digest = md.digest(str.getBytes());

            //
            return new String(new Hex().encode(digest));
            //

        } catch (Exception e) {
            e.printStackTrace();
            System.out.println(e.toString());
            return "";
        }
    }
    /**
     * 简单的MD5加密
     * @param password
     * @return
     */
    public  String getEsayStrMD5(String password) {

        char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
        try {
            byte strTemp[] = password.getBytes("UTF-8");
            MessageDigest mdTemp = MessageDigest.getInstance("MD5");
            mdTemp.update(strTemp);
            byte md[] = mdTemp.digest();
            int j = md.length;
            char str[] = new char[j * 2];
            int k = 0;
            for (int i = 0; i < j; i++) {
                byte byte0 = md[i];
                str[k++] = hexDigits[byte0 >>> 4 & 15];
                str[k++] = hexDigits[byte0 & 15];
            }
             //

            return new String(str);
           //

        } catch (Exception e) {
            return null;
        }
    }
    /**
     * 获取的salt和
     * @param password
     * @param salt
     * @return
     */
    public  String getSaltMD5(String password,String salt) {

        //System.out.println(password);
        password = md5Hex(password + salt);
        //System.out.println(password);
        char[] cs = new char[48];
        for (int i = 0; i <48 ; i += 3)
        {
            cs[i] = password.charAt(i / 3 * 2);
            char c = salt.charAt(i / 3);
            cs[i + 1] = c;
            cs[i + 2] = password.charAt(i / 3 * 2 + 1);

        }
        return String.valueOf(cs);
    }
}

Salt与MD5合并加密并验证

package util;

public class MD5_Salt {  

    public String get_MD5Salt(String password,String salt1,String salt2)
    {

        MD5 md5 =new MD5();
        String   password1=md5.getSaltMD5(password, salt1);
        String dbpassword =md5.getSaltMD5(password1, salt2);
        return dbpassword;

    }
    public boolean TF_Password_DBpassword(String password, String dbpassword,String salt1,String salt2)
    {
        int i=0;
        MD5 md5 =new MD5();
        password=md5.getSaltMD5(password, salt1);
        String dbpassword1 =md5.getSaltMD5(password, salt2);
        if(dbpassword1.equals(dbpassword))
        {
            i=1;
        }

        if(i==0)
        {
        return false;
        }
        else
        {
            return true;
        }

    }
}