[Notes] several PHP encryption algorithms-php Tutorial

[Note] several PHP encryption algorithms 1. Discuz authcode

 0 verify data validity // substr ($ result, 10, 16) = substr (md5 (substr ($ result, 26 ). $ keyb), 0, 16) verify data integrity // verify data validity. please refer to the unencrypted plaintext format 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 {// Save the dynamic key in the ciphertext, this is also the reason why different ciphertext texts can be decrypted in the same plain text. // because the encrypted ciphertext may be special characters, the replication process may be lost, therefore, return $ keyc is encoded in base64 format. str_replace ('=', '', base64_encode ($ result) ;}}$ a =" www.test.com "; $ B = authcode ($ a," ENCODE ", "abc123"); echo $ B."
"; Echo authcode ($ B," DECODE "," abc123 ");

2. simple symmetric encryption algorithm

 * @ Date * @ update 2014-10-10 * @ return String */function encode ($ string = '', $ skey = 'cxphp ') {$ strArr = str_split (base64_encode ($ string); $ strCount = count ($ strArr); foreach (str_split ($ skey) as $ key => $ value) $ key <$ strCount & $ strArr [$ key]. = $ value; return str_replace (array ('=', '+', '/'), array ('o0o0o', 'o000o', 'oo00o '), join ('', $ strArr ));} /*** decryption of simple symmetric encryption algorithm * @ param String $ string the String to be decrypted * @ param String $ skey decryption KEY * @ author Anyon Zou
 
  
* @ Date * @ update 2014-10-10 * @ return String */function decode ($ string = '', $ skey = 'cxphp ') {$ strArr = str_split (str_replace (array ('Oss 0o', 'Oss 000o', 'oo00o'), array ('=', '+ ','/'), $ string), 2); $ strCount = count ($ strArr); foreach (str_split ($ skey) as $ key => $ value) $ key <= $ strCount & isset ($ strArr [$ key]) & $ strArr [$ key] [1] ===$ value & $ strArr [$ key] = $ strArr [$ key] [0]; return base64_decode (join ('', $ strArr);} echo'
  
'; $ Str = '2014 23365247,54, four classical styles'; echo "string:". $ str ."
"; Echo" encode: ". ($ enstring = encode ($ str )).'
'; Echo "decode:". decode ($ enstring );
3. DES encryption and decryption
  
   Key = $ key; if ($ iv = 0) {$ this-> iv = $ key;} else {$ this-> iv = $ iv ;}} // encryption function encrypt ($ str) {$ size = mcrypt_get_block_size (MCRYPT_DES, MCRYPT_MODE_CBC); $ str = $ this-> pkcs5Pad ($ str, $ size ); $ data = mcrypt_cbc (MCRYPT_DES, $ this-> key, $ str, MCRYPT_ENCRYPT, $ this-> iv); // $ data = strtoupper (bin2hex ($ data )); // return the uppercase hexadecimal string return base64_encode ($ data);} // decrypt func Tion decrypt ($ str) {$ str = base64_decode ($ str); // $ strBin = $ this-> hex2bin (strtolower ($ str )); $ str = mcrypt_cbc (MCRYPT_DES, $ this-> key, $ str, MCRYPT_DECRYPT, $ this-> iv); $ str = $ this-> pkcs5Unpad ($ str ); return $ str;} function hex2bin ($ hexData) {$ binData = ""; for ($ I = 0; $ I <strlen ($ hexData); $ I + = 2) {$ binData. = chr (hexdec (substr ($ hexData, $ I, 2 )));} Return $ binData;} function pkcs5Pad ($ text, $ blocksize) {$ pad = $ blocksize-(strlen ($ text) % $ blocksize); return $ text. str_repeat (chr ($ pad), $ pad);} function pkcs5Unpad ($ text) {$ pad = ord ($ text {strlen ($ text)-1 }); if ($ pad> strlen ($ text) return false; if (strspn ($ text, chr ($ pad), strlen ($ text)-$ pad )! = $ Pad) return false; return substr ($ text, 0,-1 * $ pad) ;}}$ str = 'abc'; $ key = '2016 '; // $ crypt = new DES ($ key); $ mstr = $ crypt-> encrypt ($ str ); $ str = $ crypt-> decrypt ($ mstr); echo $ str. '<=> '. $ mstr;
4. PHP hex2bin
  
   '; Echo hexXbin ($ t );