MD5加密与验证

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53

package com.study;   import java.security.MessageDigest; import java.security.NoSuchAlgorithmException;   public class Md5Test {             public static String encodeByMD5(String userPwd){                   String pwdByMd5 = "";                   try {             MessageDigest md5 = MessageDigest.getInstance("MD5");                           byte[] bytePwd = md5.digest(userPwd.getBytes());                            StringBuffer hexValue = new StringBuffer();                             for (int i = 0; i < bytePwd.length; i++) {                   int val = ((int) bytePwd[i]) & 0xff;                   if (val < 16)                       hexValue.append("0");                   hexValue.append(Integer.toHexString(val));               }               pwdByMd5 = hexValue.toString();         } catch (NoSuchAlgorithmException e) {             e.printStackTrace();         }                                       return pwdByMd5;     }                  /**         * 验证输入的密码是否正确         * @param password    加密后的密码         * @param inputString    输入的字符串         * @return    验证结果，TRUE:正确 FALSE:错误         */          public static boolean validatePassword(String password, String inputString){              if(password.equals(encodeByMD5(inputString))){                   return true;              } else{                   return false;              }          }                }

　　与 0xff进行&运算 是为了用8字节的byte类型获取一个32字节的int类型数