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HomeBackend DevelopmentPHP TutorialAnalysis of the specific usage of PHP encryption and decryption function authcode_PHP tutorial

The specific example code of PHP encryption and decryption function authcode is as follows:

  1. // Parameter explanation
  2. // $string: plaintext or ciphertext
  3. // $operation: DECODE means decryption, others means encryption
  4. // $key: Key
  5. // $expiry: Ciphertext validity period
  6. function authcode($string, $operation =
    'DECODE', $key = '', $expiry = 0) {
  7. // Dynamic key length, the same plaintext will generate different ciphertext, relying on the dynamic key
  8. $ckey_length = 4;
  9. // Key
  10. $key = md5($key ? $key : $GLOBALS['discuz_auth_key']);
  11. // Key a will participate in encryption and decryption
  12. $ keya = md5(substr($key, 0, 16));
  13. // key b Will be used for data integrity verification
  14. $keyb = md5(substr ($key, 16, 16));
  15. // Key c is used to change the generated ciphertext
  16. $ keyc = $ckey_length ? ($operation == 'DECODE'
    ? substr($string, 0, $ckey_length): substr (md5
    (microtime()), -$ckey_length)) : '';
  17. //The key used by the PHP encryption and decryption function authcode to participate in the operation
  18. $cryptkey = $keya.md5($keya.$keyc);
  19. $key_length = strlen($cryptkey);
  20. // Plain text, the first 10 bits are used to save Timestamp, verify data validity when decrypting.
    10 to 26 bits are used to save $keyb (key b). Data integrity will be verified through this key during decryption.
  21. // If it is decoding, it will start from the $ckey_length bit, because the $ckey_
    length bit before the ciphertext saves the dynamic key to ensure correct decryption
  22. $string = $operation == 'DECODE' ? base64_decode(substr
    ($string, $ckey_length)) : sprintf( '%010d', $expiry ?
    $expiry + time() : 0).substr(md5($string.$keyb), 0, 16).$string;
  23. $string_length = strlen($string);
  24. $result = '';
  25. (0, 255); 🎜>();
  26. //PHP encryption and decryption function authcode generates key book for($i
  27. =
  28. 0; $i = 255; $i++) {
  29. $rndkey[$i] = ord($cryptkey[$i % $key_length]);
  30. }
  31. //Using a fixed algorithm to scramble the key book and increase randomness seems very complicated. In fact, it will not increase the strength of the ciphertext for( $j = $i
  32. = 0
  33. ; $i

  34. 256
  35. ; $i++) {
  36. $j = ($j + $box[$i] + $rndkey[$i]) % 256; $tmp = $box[$i]; $box[$i] = $box[$j];
  37. $box [$j] = $tmp;
  38. }
  39. //PHP encryption and decryption function authcode core encryption and decryption part
  40. for($a
  41. = $
  42. j
  43. = $
  44. i
  45. =
  46. 0
  47. ; $i
  48. $string_length; $i++) {
  49. $a = ($a + 1) % 256; $j = ($j + $box[$a]) % 256; $tmp
  50. = $box[$a] ;
  51. $box[$a] = $box[$j];
  52. $box[$j] = $tmp;
  53. // PHP encryption and decryption function authcode gets the key from the key book, performs XOR, and then converts it into characters
  54. $result
  55. .= chr
  56. (ord($string[$i]) ^ (
  57. $box[($box[$a] + $box[$j]) % 256]));
  58. }
  59. if($operation
  60. == 'DECODE') { // substr($result, 0, 10) == 0 Verify data validity // substr($result, 0, 10) - time()
    >
  61. 0 Verify data validity
  62. // substr($result, 10, 16) == substr(md5(substr
  63. ($result, 26).$keyb), 0, 16) Verify data integrity // Verify data validity, please see the format of unencrypted plaintext
  64. if((substr($result, 0, 10) == 0 || substr( $result, 0, 10) - time()
  65. >
  66. 0) && substr($result, 10, 16) == substr(md5(substr($result, 26).$keyb), 0, 16)) {
  67. return substr($result, 26);
  68. } else {
  69. return '';
  70. }
  71. } else {
  72. //PHP encryption and decryption function authcode saves the dynamic key in the ciphertext, which is why the same plaintext can be decrypted after
    producing different ciphertexts
  73. // Because the encrypted ciphertext may contain some special characters,
    may be lost during the copying process, so base64 encoding is used
  74. return $ keyc.str_replace('=', '',
    base64_encode($result));
  75. }
  76. }

The above code is the specific usage of PHP encryption and decryption function authcode. I hope you can initially grasp the meaning of this function through the content introduced in this article.


www.bkjia.comtruehttp: //www.bkjia.com/PHPjc/446263.htmlTechArticleThe specific example code of PHP encryption and decryption function authcode is as follows: //Parameter explanation//$string: plain text or cipher text //$operation: DECODE means decryption, others means encryption //$key: key //$expir...
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