PHP aes算法

PHP aes算法

1. function aes128cbcEncrypt($key, $text)
2. {
3. /**
4. * Open the cipher
5. */
6. $td = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, '');
7. if (! $td)
8. {
9. throw new GeneralSecurityException('Invalid mcrypt cipher, check your libmcrypt library and php-mcrypt extention');
10. }
11. // replaced MCRYPT_DEV_RANDOM with MCRYPT_RAND since windows doesn't have /dev/rand :)
12. srand((double)microtime() * 1000000);
13. $iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
14. /**
15. * Intialize encryption
16. */
17. mcrypt_generic_init($td, $key, $iv);
18. /**
19. * Encrypt data
20. */
21. $encrypted = mcrypt_generic($td, $text);
22. /**
23. * Terminate encryption handler
24. */
25. mcrypt_generic_deinit($td);
26. /**
27. * AES-128-CBC encryption. The IV is returned as the first 16 bytes
28. * of the cipher text.
29. */
30. return $iv . $encrypted;
31. }
33. function aes128cbcDecrypt($key, $encrypted_text)
34. {
35. /**
36. * Open the cipher
37. */
38. $td = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, '');
39. if (is_callable('mb_substr'))
40. {
41. $iv = mb_substr($encrypted_text, 0, Crypto_CIPHER_BLOCK_SIZE, 'latin1');
42. }
43. else
44. {
45. $iv = substr($encrypted_text, 0, Crypto_CIPHER_BLOCK_SIZE);
46. }
47. /**
48. * Initialize encryption module for decryption
49. */
50. mcrypt_generic_init($td, $key, $iv);
51. /**
52. * Decrypt encrypted string
53. */
54. if (is_callable('mb_substr'))
55. {
56. $encrypted = mb_substr($encrypted_text, Crypto_CIPHER_BLOCK_SIZE, mb_strlen($encrypted_text, 'latin1'), 'latin1');
57. }
58. else
59. {
60. $encrypted = substr($encrypted_text, Crypto_CIPHER_BLOCK_SIZE);
61. }
62. $decrypted = mdecrypt_generic($td, $encrypted);
63. /**
64. * Terminate decryption handle and close module
65. */
66. mcrypt_generic_deinit($td);
67. mcrypt_module_close($td);
68. /**
69. * Show string
70. */
71. return trim($decrypted);
72. }
73. define('Crypto_CIPHER_BLOCK_SIZE', 16);
74. $a = aes128cbcEncrypt('pass', 'this is text');
75. echo base64_encode($a) . "/r/n";
76. $b = aes128cbcDecrypt('pass', $a);
77. echo $b . "/r/n";
78. $c = aes128cbcDecrypt('pass', base64_decode(base64_encode($a)));
79. echo $c . "/r/n";
80. ?>

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