PHP使用DES进行加密和解密

 1 //$input - stuff to decrypt
 2 
 3     //$key - the secret key to use
 4 
 5 
 6 
 7     function do_mencrypt($input, $key)
 8 
 9     {
10 
11         $input = str_replace(""n", "", $input);
12 
13         $input = str_replace(""t", "", $input);
14 
15         $input = str_replace(""r", "", $input);
16 
17         $key = substr(md5($key), 0, 24);
18 
19         $td = mcrypt_module_open('tripledes', '', 'ecb', '');
20 
21         $iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
22 
23         mcrypt_generic_init($td, $key, $iv);
24 
25         $encrypted_data = mcrypt_generic($td, $input);
26 
27         mcrypt_generic_deinit($td);
28 
29         mcrypt_module_close($td);
30 
31         return trim(chop(base64_encode($encrypted_data)));
32 
33     }
34 
35     
36 
37     //$input - stuff to decrypt
38 
39     //$key - the secret key to use
40 
41     
42 
43     function do_mdecrypt($input, $key)
44 
45     {
46 
47         $input = str_replace(""n", "", $input);
48 
49         $input = str_replace(""t", "", $input);
50 
51         $input = str_replace(""r", "", $input);
52 
53         $input = trim(chop(base64_decode($input)));
54 
55         $td = mcrypt_module_open('tripledes', '', 'ecb', '');
56 
57         $key = substr(md5($key), 0, 24);
58 
59         $iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
60 
61         mcrypt_generic_init($td, $key, $iv);
62 
63         $decrypted_data = mdecrypt_generic($td, $input);
64 
65         mcrypt_generic_deinit($td);
66 
67         mcrypt_module_close($td);
68 
69         return trim(chop($decrypted_data));
70 
71 
72     }