这篇文章主要介绍了php实现的AES加密类定义与用法,结合完整实例形式分析了基于php的AES加密类实现及使用方法,需要的朋友可以参考下。

本文实例讲述了php实现的AES加密类定义与用法，分享给大家供大家参考，具体如下：

CryptAES.class.php文件：

1. <?php
2. class CryptAES
3. {
4. protected $cipher = MCRYPT_RIJNDAEL_128;
5. protected $mode = MCRYPT_MODE_ECB;
6. protected $pad_method = NULL;
7. protected $secret_key = '';
8. protected $iv = '';
9. public function set_cipher($cipher)
10. {
11. $this->cipher = $cipher;
12. }
13. public function set_mode($mode)
14. {
15. $this->mode = $mode;
16. }
17. public function set_iv($iv)
18. {
19. $this->iv = $iv;
20. }
21. public function set_key($key)
22. {
23. $this->secret_key = $key;
24. }
25. public function require_pkcs5()
26. {
27. $this->pad_method = 'pkcs5';
28. }
29. protected function pad_or_unpad($str, $ext)
30. {
31. if ( is_null($this->pad_method) )
32. {
33. return $str;
34. }
35. else
36. {
37. $func_name = __CLASS__ . '::' . $this->pad_method . '_' . $ext . 'pad';
38. if ( is_callable($func_name) )
39. {
40. $size = mcrypt_get_block_size($this->cipher, $this->mode);
41. return call_user_func($func_name, $str, $size);
42. }
43. }
44. return $str;
45. }
46. protected function pad($str)
47. {
48. return $this->pad_or_unpad($str, '');
49. }
50. protected function unpad($str)
51. {
52. return $this->pad_or_unpad($str, 'un');
53. }
54. public function encrypt($str)
55. {
56. $str = $this->pad($str);
57. $td = mcrypt_module_open($this->cipher, '', $this->mode, '');
58. if ( emptyempty($this->iv) )
59. {
60. $iv = @mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
61. }
62. else
63. {
64. $iv = $this->iv;
65. }
66. mcrypt_generic_init($td, $this->secret_key, $iv);
67. $cyper_text = mcrypt_generic($td, $str);
68. //$rt=base64_encode($cyper_text);
69. $rt = bin2hex($cyper_text);
70. mcrypt_generic_deinit($td);
71. mcrypt_module_close($td);
72. return $rt;
73. }
74. public function decrypt($str){
75. $td = mcrypt_module_open($this->cipher, '', $this->mode, '');
76. if ( emptyempty($this->iv) )
77. {
78. $iv = @mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
79. }
80. else
81. {
82. $iv = $this->iv;
83. }
84. mcrypt_generic_init($td, $this->secret_key, $iv);
85. $decrypted_text = mdecrypt_generic($td, self::hex2bin($str));
86. //$decrypted_text = mdecrypt_generic($td, base64_decode($str));
87. $rt = $decrypted_text;
88. mcrypt_generic_deinit($td);
89. mcrypt_module_close($td);
90. return $this->unpad($rt);
91. }
92. public static function hex2bin($hexdata) {
93. $bindata = '';
94. $length = strlen($hexdata);
95. for ($i=0; $i < $length; $i += 2)
96. {
97. $bindata .= chr(hexdec(substr($hexdata, $i, 2)));
98. }
99. return $bindata;
100. }
101. public static function pkcs5_pad($text, $blocksize)
102. {
103. $pad = $blocksize - (strlen($text) % $blocksize);
104. return $text . str_repeat(chr($pad), $pad);
105. }
106. public static function pkcs5_unpad($text)
107. {
108. $pad = ord($text{strlen($text) - 1});
109. if ($pad > strlen($text)) return false;
110. if (strspn($text, chr($pad), strlen($text) - $pad) != $pad) return false;
111. return substr($text, 0, -1 * $pad);
112. }
113. }
114. ?>

用法：

1. require_once("CryptAES.class.php");
2. $keyStr = 'ss4fs4skfhksk';
3. $aes = new CryptAES();
4. $keyStr = $aes->hex2bin($keyStr);
5. $aes->set_key($keyStr);
6. $aes->require_pkcs5();
7. $d = $aes->encrypt($data);

注：这里需要在php.ini中开启：extension=php_mcrypt.dll