关于des加密与解密实现方法(php net两个版本)

3. /**

4. des 加密 解密
5. */
6. class STD3Des
7. {
8. private $key = "";
9. private $iv = "";

10. /**

11. * 构造，传递二个已经进行base64_encode的KEY与IV
12. *
13. * @param string $key
14. * @param string $iv
15. */
16. function __construct ($key, $iv)
17. {
18. if (empty($key) || empty($iv)) {
19. echo 'key and iv is not valid';
20. exit();
21. }
22. $this->key = $key;
23. $this->iv = $iv;
24. }

25. /**

26. *加密
27. * @param $value
28. * @return
29. */
30. public function encrypt ($value)
31. {
32. $td = mcrypt_module_open(MCRYPT_3DES, '', MCRYPT_MODE_CBC, '');
33. $iv = base64_decode($this->iv);
34. $value = $this->PaddingPKCS7($value);
35. $key = base64_decode($this->key);
36. mcrypt_generic_init($td, $key, $iv);
37. $ret = base64_encode(mcrypt_generic($td, $value));
38. mcrypt_generic_deinit($td);
39. mcrypt_module_close($td);
40. return $ret;
41. }

42. /**

43. *解密
44. * @param $value
45. * @return
46. */
47. public function decrypt ($value)
48. {
49. $td = mcrypt_module_open(MCRYPT_3DES, '', MCRYPT_MODE_CBC, '');
50. $iv = base64_decode($this->iv);
51. $key = base64_decode($this->key);
52. mcrypt_generic_init($td, $key, $iv);
53. $ret = trim(mdecrypt_generic($td, base64_decode($value)));
54. $ret = $this->UnPaddingPKCS7($ret);
55. mcrypt_generic_deinit($td);
56. mcrypt_module_close($td);
57. return $ret;
58. }

59. private function PaddingPKCS7 ($data)

60. {
61. $block_size = mcrypt_get_block_size('tripledes', 'cbc');
62. $padding_char = $block_size - (strlen($data) % $block_size);
63. $data .= str_repeat(chr($padding_char), $padding_char);
64. return $data;
65. }

66. private function UnPaddingPKCS7($text)

67. {
68. $pad = ord($text{strlen($text) - 1});
69. if ($pad > strlen($text)) {
70. return false;
71. }
72. if (strspn($text, chr($pad), strlen($text) - $pad) != $pad) {
73. return false;
74. }
75. return substr($text, 0, - 1 * $pad);
76. }
77. }

78. //使用

79. include('STD3Des.class.php');
80. $key='abcdefgh';
81. $iv='abcdefgh';
82. $msg='test string';
83. $des=new STD3Des(base64_encode($key),base64_encode($iv));
84. $rs1=$des->encrypt($msg);
85. echo $rs1.'
    ';
86. $rs2=$des->decrypt($rs1);
87. echo $rs2;

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2、.net版本

3. //des 加密 解密

4. sealed public class CryptoHelper
5. {
6. ///
   /// Encrypts the specified input.

   ///
7. /// The input.
8. /// key
9. /// iv
10. ///
11. public static string EncryptDes(string input, byte[] key, byte[] iv)
12. {
13. if (input == null || input.Length == 0)
14. return String.Empty;

15. DESCryptoServiceProvider des = new DESCryptoServiceProvider();

16. MemoryStream ms = null;
17. CryptoStream encStream = null;
18. StreamWriter sw = null;
19. string result = String.Empty;

20. try

21. {
22. ms = new MemoryStream();

23. // Create a CryptoStream using the memory stream and the

24. // CSP DES key.
25. //des.Mode = CipherMode.CBC;
26. //des.Padding = PaddingMode.PKCS7;
27. encStream = new CryptoStream(ms, des.CreateEncryptor(key, iv), CryptoStreamMode.Write);

28. // Create a StreamWriter to write a string

29. // to the stream.
30. sw = new StreamWriter(encStream);

31. // Write the plaintext to the stream.

32. sw.Write(input);

33. sw.Flush();

34. encStream.FlushFinalBlock();
35. ms.Flush();

36. result = Convert.ToBase64String(ms.GetBuffer(), 0, Convert.ToInt32(ms.Length, CultureInfo.InvariantCulture));

37. }
38. finally
39. {
40. //close objects
41. if (sw != null)
42. sw.Close();
43. if (encStream != null)
44. encStream.Close();
45. if (ms != null)
46. ms.Close();
47. }

48. // Return the encrypted string

49. return result;
50. }
51. ///
    /// Decrypts the specified input.

    ///
52. /// the input.
53. /// key
54. /// iv
55. ///
56. public static string DecryptDes(string input, byte[] key, byte[] iv)
57. {
58. byte[] buffer;
59. try { buffer = Convert.FromBase64String(input); }
60. catch (System.ArgumentNullException) { return String.Empty; }
61. // length is zero, or not an even multiple of four (plus a few other cases)
62. catch (System.FormatException) { return String.Empty; }

63. DESCryptoServiceProvider des = new DESCryptoServiceProvider();

64. MemoryStream ms = null;
65. CryptoStream encStream = null;
66. StreamReader sr = null;
67. string result = String.Empty;

68. try

69. {
70. ms = new MemoryStream(buffer);

71. // Create a CryptoStream using the memory stream and the

72. // CSP DES key.
73. encStream = new CryptoStream(ms, des.CreateDecryptor(key, iv), CryptoStreamMode.Read);

74. // Create a StreamReader for reading the stream.

75. sr = new StreamReader(encStream);

76. // Read the stream as a string.

77. result = sr.ReadToEnd();
78. }
79. finally
80. {
81. //close objects
82. if (sr != null)
83. sr.Close();
84. if (encStream != null)
85. encStream.Close();
86. if (ms != null)
87. ms.Close();
88. }

89. return result;

90. }
91. }

92. //调用

93. string key = "abcdefgh";
94. string iv = "abcdefgh";
95. string msg="test string";
96. string rs1 = CryptoHelper.EncryptDes(msg, System.Text.Encoding.ASCII.GetBytes(key), System.Text.Encoding.ASCII.GetBytes(iv));
97. string rs2 = CryptoHelper.DecryptDes(rs1, System.Text.Encoding.ASCII.GetBytes(key), System.Text.Encoding.ASCII.GetBytes(iv));

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