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关于des加密与解密实现方法(php net两个版本)

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Libérer: 2016-07-25 09:04:25
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  1. /**

  2. des 加密 解密
  3. */
  4. class STD3Des
  5. {
  6. private $key = "";
  7. private $iv = "";
  8. /**

  9. * 构造,传递二个已经进行base64_encode的KEY与IV
  10. *
  11. * @param string $key
  12. * @param string $iv
  13. */
  14. function __construct ($key, $iv)
  15. {
  16. if (empty($key) || empty($iv)) {
  17. echo 'key and iv is not valid';
  18. exit();
  19. }
  20. $this->key = $key;
  21. $this->iv = $iv;
  22. }
  23. /**

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

  41. *解密
  42. * @param $value
  43. * @return
  44. */
  45. public function decrypt ($value)
  46. {
  47. $td = mcrypt_module_open(MCRYPT_3DES, '', MCRYPT_MODE_CBC, '');
  48. $iv = base64_decode($this->iv);
  49. $key = base64_decode($this->key);
  50. mcrypt_generic_init($td, $key, $iv);
  51. $ret = trim(mdecrypt_generic($td, base64_decode($value)));
  52. $ret = $this->UnPaddingPKCS7($ret);
  53. mcrypt_generic_deinit($td);
  54. mcrypt_module_close($td);
  55. return $ret;
  56. }
  57. private function PaddingPKCS7 ($data)

  58. {
  59. $block_size = mcrypt_get_block_size('tripledes', 'cbc');
  60. $padding_char = $block_size - (strlen($data) % $block_size);
  61. $data .= str_repeat(chr($padding_char), $padding_char);
  62. return $data;
  63. }
  64. private function UnPaddingPKCS7($text)

  65. {
  66. $pad = ord($text{strlen($text) - 1});
  67. if ($pad > strlen($text)) {
  68. return false;
  69. }
  70. if (strspn($text, chr($pad), strlen($text) - $pad) != $pad) {
  71. return false;
  72. }
  73. return substr($text, 0, - 1 * $pad);
  74. }
  75. }
  76. //使用

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

  1. //des 加密 解密

  2. sealed public class CryptoHelper
  3. {
  4. ///
  5. /// Encrypts the specified input.
  6. ///
  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. ///
  52. /// Decrypts the specified input.
  53. ///
  54. /// the input.
  55. /// key
  56. /// iv
  57. ///
  58. public static string DecryptDes(string input, byte[] key, byte[] iv)
  59. {
  60. byte[] buffer;
  61. try { buffer = Convert.FromBase64String(input); }
  62. catch (System.ArgumentNullException) { return String.Empty; }
  63. // length is zero, or not an even multiple of four (plus a few other cases)
  64. catch (System.FormatException) { return String.Empty; }
  65. DESCryptoServiceProvider des = new DESCryptoServiceProvider();

  66. MemoryStream ms = null;
  67. CryptoStream encStream = null;
  68. StreamReader sr = null;
  69. string result = String.Empty;
  70. try

  71. {
  72. ms = new MemoryStream(buffer);
  73. // Create a CryptoStream using the memory stream and the

  74. // CSP DES key.
  75. encStream = new CryptoStream(ms, des.CreateDecryptor(key, iv), CryptoStreamMode.Read);
  76. // Create a StreamReader for reading the stream.

  77. sr = new StreamReader(encStream);
  78. // Read the stream as a string.

  79. result = sr.ReadToEnd();
  80. }
  81. finally
  82. {
  83. //close objects
  84. if (sr != null)
  85. sr.Close();
  86. if (encStream != null)
  87. encStream.Close();
  88. if (ms != null)
  89. ms.Close();
  90. }
  91. return result;

  92. }
  93. }
  94. //调用

  95. string key = "abcdefgh";
  96. string iv = "abcdefgh";
  97. string msg="test string";
  98. string rs1 = CryptoHelper.EncryptDes(msg, System.Text.Encoding.ASCII.GetBytes(key), System.Text.Encoding.ASCII.GetBytes(iv));
  99. string rs2 = CryptoHelper.DecryptDes(rs1, System.Text.Encoding.ASCII.GetBytes(key), System.Text.Encoding.ASCII.GetBytes(iv));
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看完以上两段代码,不知道你有收获没有?个人比较喜欢php版的des加密与解密方法,简洁清晰。 脚本学堂(bbs.it-home.org),专心为您。



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