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本文實例講述了PHP實現的AES雙向加密解密功能。分享給大家供大家參考，具體如下：

01<?php
02/*
03 * Created on 2018-9-1
04 *
05 * To change the template for this generated file go to
06 * Window - Preferences - PHPeclipse - PHP - Code Templates
07 */
08 /**
09 用法：
10 Security::encrypt($str,$key);
11 Security::decrypt($str,$key);
12 */
13 class Security {
14  public static function encrypt($input, $key) {
15   $size = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_ECB);
16   $input = Security::pkcs5_pad($input, $size);
17   $td = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_ECB, '');
18   $iv = mcrypt_create_iv (mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
19   mcrypt_generic_init($td, $key, $iv);
20   $data = mcrypt_generic($td, $input);
21   mcrypt_generic_deinit($td);
22   mcrypt_module_close($td);
23   $data = base64_encode($data);
24   return $data;
25  }
26  private static function pkcs5_pad ($text, $blocksize) {
27   $pad = $blocksize - (strlen($text) % $blocksize);
28   return $text . str_repeat(chr($pad), $pad);
29  }
30  public static function decrypt($sStr, $sKey) {
31   $decrypted= mcrypt_decrypt(
32    MCRYPT_RIJNDAEL_128,
33    $sKey,
34    base64_decode($sStr),
35    MCRYPT_MODE_ECB
36   );
37   $dec_s = strlen($decrypted);
38   $padding = ord($decrypted[$dec_s-1]);
39   $decrypted = substr($decrypted, 0, -$padding);
40   return $decrypted;
41  }
42 }
43//用法示例：
44$str = "www.jfrwli.cn";
45$key = "123456";
46echo "原始字符串：".$str."<br/>";
47$pwdstr = Security::encrypt($str,$key);
48echo "加密后：".$pwdstr."<br/>";
49$destr = Security::decrypt($pwdstr,$key);
50echo "解密結果：".$destr;
51?>