Php source code analysis-DZX1.5 encryption and decryption function authcode usage-PHP Tutorial

Php source code analysis-DZX1.5 encryption and decryption function authcode usage. Php source code analysis-DZX1.5 encryption and decryption function authcode usage this article describes the php source code analysis-DZX1.5 encryption and decryption function authcode usage. Share it with you for your reference. Analysis of php source code analysis-DZX1.5 encryption and decryption function authcode usage

This article describes how to use the authcode function of DZX1.5 encryption and decryption in php source code analysis. Share it with you for your reference. The specific analysis is as follows:

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61

$ Authkey = ''; /** * @ Param string $ string: Enter the plaintext (or ciphertext) to be encrypted (or decrypted) * @ Param string $ operation: 'decode' or others. by default, this parameter indicates decryption, and other parameters include encryption. * @ Param string $ key: encryption/decryption key * @ Param int $ expiry: validity period */ Function authcode ($ string, $ operation = 'Decode', $ key = '', $ expiry = 0 ){ Global $ authkey; $ Ckey_length = 4; $ Key = md5 ($ key! = ''? $ Key: $ authkey ); $ Keya = md5 (substr ($ key, 0, 16 )); $ Keyb = md5 (substr ($ key, 16, 16 )); $ Keyc = $ ckey_length? ($ Operation = 'decode '? Substr ($ string, 0, $ ckey_length): substr (md5 (microtime (),-$ ckey_length )):''; $ Cryptkey = $ keya. md5 ($ keya. $ keyc ); $ Key_length = strlen ($ cryptkey ); $ String = $ operation = 'decode '? Base64_decode (substr ($ string, $ ckey_length): sprintf ('% 010d', $ expiry? $ Expiry + time (): 0). substr (md5 ($ string. $ keyb), 0, 16). $ string; $ String_length = strlen ($ string ); $ Result = ''; $ Box = range (1, 0,255 ); $ Rndkey = array (); For ($ I = 0; $ I <= 255; $ I ++ ){ $ Rndkey [$ I] = ord ($ cryptkey [$ I % $ key_length]); } For ($ j = $ I = 0; I I <256; $ I ++ ){ $ J = ($ j + $ box [$ I] + $ rndkey [$ I]) % 256; $ Tmp = $ box [$ I]; $ Box [$ I] = $ box [$ j]; $ Box [$ j] = $ tmp; } For ($ a = $ j = $ I = 0; $ I <$ string_length; $ I ++ ){ $ A = ($ a + 1) % 256; $ J = ($ j + $ box [$ a]) % 256; $ Tmp = $ box [$ a]; $ Box [$ a] = $ box [$ j]; $ Box [$ j] = $ tmp; $ Result. = chr (ord ($ string [$ I]) ^ ($ box [($ box [$ a] + $ box [$ j]) % 256]); } If ($ operation = 'decode '){ If (substr ($ result, 0, 10) = 0 | substr ($ result, 0, 10)-time ()> 0) & substr ($ result, 10, 16) = substr (md5 (substr ($ result, 26 ). $ keyb), 0, 16 )){ Return substr ($ result, 26 ); } Else { Return ''; } } Else { Return $ keyc. str_replace ('=', '', base64_encode ($ result )); } } $ Str = '000000 '; $ Key = '000000 '; Echo "Plaintext:". $ str; Echo" "; Echo "key:". $ key; $ Encode = authcode ($ str, '11', $ key ); Echo" "; Echo "encrypted ciphertext:". $ encode; Echo" "; $ Decode = authcode ($ encode, 'Decode', $ key ); Echo "decrypted plaintext:". $ decode; /* End of php */

The running result is as follows:

Plaintext: 1234

Secret key: 1234

Encrypted ciphertext: a52f67eXZGVy0HtQBo4vOREhq3WxnL6E2zlx75JGfoJW

Decrypted plaintext: 1234

I hope this article will help you with php programming.

Examples in this article describes the usage of DZX1.5 encryption and decryption function authcode in php source code analysis. Share it with you for your reference. Specific analysis...