MD5加密

MD5加密 - 云代码 http://yuncode.net/code/c_50b460ae6791910

 

 

import java.security.MessageDigest;/** * 对密码进行加密和验证的程序 */public class Password {/** 十六进制下数字到字符的映射数组 */private final static String[] hexDigits = { "0", "1", "2", "3", "4", "5","6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };/** * 把inputString加密。 *  * @param inputString *            待加密的字符串 * @return */public static String createPassword(String inputString) {return encodeByMD5(inputString);}/** * 验证输入的密码是否正确 *  * @param password *            真正的密码（加密后的真密码） * @param inputString *            输入的字符串 * @return */public static boolean authenticatePassword(String password,String inputString) {if (password.equals(encodeByMD5(inputString))) {return true;} else {return false;}}/** * 对字符串进行MD5编码 *  * @param originString * @return */private static String encodeByMD5(String originString) {if (originString != null) {try {MessageDigest md = MessageDigest.getInstance("MD5");byte[] results = md.digest(originString.getBytes());String resultString = byteArrayToHexString(results);return resultString.toUpperCase();} catch (Exception ex) {ex.printStackTrace();}}return null;}/** * 转换字节数组为16进制字串 *  * @param b *            字节数组 * @return 十六进制字串 */private static String byteArrayToHexString(byte[] b) {StringBuffer resultSb = new StringBuffer();for (int i = 0; i < b.length; i++) {resultSb.append(byteToHexString(b[i]));}return resultSb.toString();}/** * 将一个字节转化成16进制形式的字符串 *  * @param b * @return */private static String byteToHexString(byte b) {int n = b;if (n < 0)n = 256 + n;int d1 = n / 16;int d2 = n % 16;return hexDigits[d1] + hexDigits[d2];}public static void main(String[] args) {String password = Password.createPassword("888888");System.out.println("对888888用MD5摘要后的字符串：" + password);String inputString = "8888";System.out.println("8888与密码匹配？"+ Password.authenticatePassword(password, inputString));inputString = "888888";System.out.println("888888与密码匹配？"+ Password.authenticatePassword(password, inputString));}}