import java.security.MessageDigest;

import java.util.Random;

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

public class PasswordUtil {

/**

* 生成含有隨機(jī)鹽的密碼

*/

public static String generate(String password) {

Random r = new Random();

StringBuilder sb = new StringBuilder(16);

sb.append(r.nextInt(99999999)).append(r.nextInt(99999999));

int len = sb.length();

if (len < 16) {

for (int i = 0; i < 16 - len; i++) {

sb.append("0");

}

}

String salt = sb.toString();

password = md5Hex(password + salt);

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 new String(cs);

}

/**

* 校驗(yàn)密碼是否正確

*/

public static boolean verify(String password, String md5) {

char[] cs1 = new char[32];

char[] cs2 = new char[16];

for (int i = 0; i < 48; i += 3) {

cs1[i / 3 * 2] = md5.charAt(i);

cs1[i / 3 * 2 + 1] = md5.charAt(i + 2);

cs2[i / 3] = md5.charAt(i + 1);

}

String salt = new String(cs2);

return md5Hex(password + salt).equals(new String(cs1));

}

/**

* 獲取十六進(jìn)制字符串形式的MD5摘要

*/

public static String md5Hex(String src) {

try {

MessageDigest md5 = MessageDigest.getInstance("MD5");

byte[] bs = md5.digest(src.getBytes());

return new String(new Hex().encode(bs));

} catch (Exception e) {

return null;

}

}

public static void main(String[] args) {

String password = generate("admin");

System.out.println(verify("admin", password));

}

}

引至：http://blog.csdn.net/xiaocha2008/article/details/42872195

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