PHP加密技术的简单实现

<?phprequire_once 'config/database.config.php';$act=$_REQUEST['act'];$username=$_POST['username'];$password=md5($_POST['password']);if ($act=='reg') {  $sql="INSERT INTO user(username,password) VALUES('{$username}','{$password}')";  $result=mysqli_query($link, $sql);    if ($result) {    echo "Success";    echo "<meta http-equiv='refresh' content='1;url=login.html'/>";  }else {    echo "Failure!";    echo "<meta http-equiv='refresh' content='1;url=reg.html'/>";  }}elseif ($act=='login') {  $sql="SELECT * FROM user WHERE username='{$username}' AND password='{$password}'";  $result=mysqli_query($link, $sql);  $validate=mysqli_fetch_array($result);  //var_dump($validate);  if ($validate) {    echo "success";    echo "<meta http-equiv='refresh' content='1;url=http://www.baidu.com'/>";  }else {    echo "failure";    echo "<meta http-equiv='refresh' content='1;url=login.html'/>";  }}

mysql> SELECT * FROM user;+----+----------+----------------------------------+| id | username | password             |+----+----------+----------------------------------+| 1 | 123   | d41d8cd98f00b204e9800998ecf8427e || 2 | 123   | 5e12a8f9c9e959060fdcaea165393039 || 3 |     | d41d8cd98f00b204e9800998ecf8427e || 4 | root   | 202cb962ac59075b964b07152d234b70 || 5 | root   | 0c51f0ba4316a5c844397f69effe2d01 |+----+----------+----------------------------------+

/** * Crypt */echo crypt('shit');echo "<hr/>";echo crypt('shit','im');echo "<hr/>";if (CRYPT_EXT_DES) {  echo crypt('shit','this is a test');}echo "<hr/>";if (CRYPT_MD5) {  echo crypt('shit','$1$this is a test$');}

1223b8c30a347321299611f873b449ad$1$ed0.Ph..$fPbfhSOMLyNdtZn9krT8X/im37cLeO/JPaQth12A1V7QCns.$1$this is $Bu9FE8Y8oGnIbftjDA4ez0

/** * Sha1 */echo "<hr/>";echo sha1('shit');echo "<hr/>";echo sha1('shit',true);  echo "<hr/>";echo sha1('admin');

echo "<hr/>";echo sha1(sha1('admin',true));echo "<hr/>";echo sha1(md5('admin'));

/** * URL编码加密 */$str="this is a test";$result=urlencode($str);echo $result;echo "<hr/>";echo urldecode($result);echo "<hr/>";$str="login.php?username=shit&action=act%3 hape#123//";echo urlencode($str);echo "<hr/>";echo "<a href='index.php?username=shit&gender=male'>Shit Login</a>";print_r($_GET);echo "<hr/>";//所以地址栏进行一下编码，一方面是保密，一方面是处理特殊情况//比如username&shit是一个整体，不编码的话，浏览器是看不出的echo "<a href='index.php?username=username&shit&gender=male'>Shit Login2</a>";print_r($_GET);echo "<hr/>";$str="username&shit";$str2="username=".urlencode($str)."&gender=".urlencode("male");echo "<a href='index.php?".$str2."'>Shit Login3</a>";print_r($_GET);echo "<hr/>";//baidu example//https://www.baidu.com/s?ie=utf8&wd=url%E7%BC%96%E7%A0%81%E5%8A%A0%E5%AF%86&tn=87048150_dg//search url编码

this+is+a+testthis is a testlogin.php%3Fusername%3Dshit%26action%3Dact%253+hape%23123%5CShit LoginArray ( [username] => username&shit [gender] => male ) Shit Login2Array ( [username] => username&shit [gender] => male ) Shit Login3Array ( [username] => username&shit [gender] => male ) 

/** * Base64 */$data="I am king";echo base64_encode($data);echo "<hr/>";echo base64_decode(base64_encode($data));echo "<hr/>";echo base64_encode("中文测试");echo "<hr/>";// echo base64_decode("R0lGODlhAQABAIAAAP///wAAACH5BAAAAAAALAAAAAABAAEAAAICRAEAOw==");$data=file_get_contents("0.jpg");echo base64_encode($data);