01.<?php

02.class Crypt3Des

03.{

04.private $key = "";

05.private $iv = "";

06./**

07.* 构造，传递二个已经进行base64_encode的KEY与IV

08.*

09.* @param string $key

10.* @param string $iv

11.*/

12.function __construct ($key, $iv)

13.{

14.if (empty($key) || empty($iv)) {

15.echo 'key and iv is not valid';

16.exit();

17.}

18.$this->key = $key;

19.$this->iv = $iv;

20.}

21./**

22.*加密

23.* @param <type> $value

24.* @return <type>

25.*/

26.public function encrypt ($value)

27.{

28.$td = mcrypt_module_open(MCRYPT_3DES, '', MCRYPT_MODE_CBC, '');

29.$iv = base64_decode($this->iv);

30.$value = $this->PaddingPKCS7($value);

31.$key = base64_decode($this->key);

32.mcrypt_generic_init($td, $key, $iv);

33.$ret = base64_encode(mcrypt_generic($td, $value));

34.mcrypt_generic_deinit($td);

35.mcrypt_module_close($td);

36.return $ret;

37.}

38./**

39.*解密

40.* @param <type> $value

41.* @return <type>

42.*/

43.public function decrypt ($value)

44.{

45.$td = mcrypt_module_open(MCRYPT_3DES, '', MCRYPT_MODE_CBC, '');

46.$iv = base64_decode($this->iv);

47.$key = base64_decode($this->key);

48.mcrypt_generic_init($td, $key, $iv);

49.$ret = trim(mdecrypt_generic($td, base64_decode($value)));

50.$ret = $this->UnPaddingPKCS7($ret);

51.mcrypt_generic_deinit($td);

52.mcrypt_module_close($td);

53.return $ret;

54.}

55.private function PaddingPKCS7 ($data)

56.{

57.$block_size = mcrypt_get_block_size('tripledes', 'cbc');

58.$padding_char = $block_size - (strlen($data) % $block_size);

59.$data .= str_repeat(chr($padding_char), $padding_char);

60.return $data;

61.}

62.private function UnPaddingPKCS7 ($text)

63.{

64.$pad = ord($text{strlen($text) - 1});

65.if ($pad > strlen($text)) {

66.return false;

67.}

68.if (strspn($text, chr($pad), strlen($text) - $pad) != $pad) {

69.return false;

70.}

71.return substr($text, 0, - 1 * $pad);

72.}

73.}

74.?>