PHP encryption and decryption instance code, php encryption and decryption instance

PHP encryption and decryption instance code, php encryption and decryption instance

The key code is as follows:

<? Phpfunction I _array_column ($ input, $ columnKey, $ indexKey = null) {if (! Function_exists ('array _ column ') {$ columnKeyIsNumber = (is_numeric ($ columnKey ))? True: false; $ indexKeyIsNull = (is_null ($ indexKey ))? True: false; $ indexKeyIsNumber = (is_numeric ($ indexKey ))? True: false; $ result = array (); foreach (array) $ input as $ key => $ row) {if ($ columnKeyIsNumber) {$ tmp = array_slice ($ row, $ columnKey, 1); $ tmp = (is_array ($ tmp )&&! Empty ($ tmp ))? Current ($ tmp): null;} else {$ tmp = isset ($ row [$ columnKey])? $ Row [$ columnKey]: null;} if (! $ IndexKeyIsNull) {if ($ indexKeyIsNumber) {$ key = array_slice ($ row, $ indexKey, 1); $ key = (is_array ($ key )&&! Empty ($ key ))? Current ($ key): null; $ key = is_null ($ key )? 0: $ key;} else {$ key = isset ($ row [$ indexKey])? $ Row [$ indexKey]: 0 ;}$ result [$ key] = $ tmp;} return $ result;} else {return array_column ($ input, $ columnKey, $ indexKey) ;}} function randcode ($ len, $ mode = 2) {$ rcode = ''; switch ($ mode) {case 1: // remove confusing characters such as 0, o, O, and l. $ chars = 'taobao'; break; case 2: // pure number $ chars = '2016'; break; case 3: // All numbers + uppercase/lowercase letters $ chars = 'abcdefghijklmnopqrstuvwxyz0123456789abcdefghijklmnopqrs Tuvwxyz '; break; case 4: // full number + uppercase/lowercase letters + special characters $ chars = 'abcdefghijklmnopqrstuvwxyz0123456789abcdefghijklmnopqrstuvwxyz ~! @ # $ % ^ & * () '; Break;} $ count = strlen ($ chars)-1; mt_srand (double) microtime () * 1000000 ); for ($ I = 0; $ I <$ len; $ I ++) {$ rcode. = $ chars [mt_rand (0, $ count)];} return $ rcode ;} /*** $ string plaintext or ciphertext * $ operation encryption ENCODE or decryption DECODE * $ key * $ expiry key validity period */function authcode ($ string, $ operation = 'decode', $ key = '', $ expiry = 0) {$ ckey_length = 4; $ key = md5 ($ key ); $ keya = md5 (substr ($ key, 0, 16); $ keyb = md5 (subs Tr ($ 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 (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 ));}}

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