Encryption method for PHP source code

Instance 1

The code is as follows

Copy Code

<?php Function Encode_file_contents ($filename) { $type =strtolower (STRRCHR ($filename, '. '), 1); if (' php ' = = $type && is_file ($filename) && is_writable ($filename)) {//If it is a PHP file and is writable, compress the encoding $ Contents = file_get_contents ($filename);//Determine whether the file has been encoded for processing $contents = Php_strip_whitespace ($filename); //Remove PHP header and tail logo $headerPos = strpos ($contents, ' <?php '); $footerPos = Strrpos ($contents, '?> '); $contents = substr ($contents, $headerPos +5, $footerPos-$headerPos); $encode = Base64_encode (Gzdeflate ($contents));//start encoding $encode = ' <?php '. N Eval (gzinflate (Base64_decode) ("."). $encode. "';")); Nn?> "; Return file_put_contents ($filename, $encode); } return false; } //Call function $filename = ' dam.php '; Encode_file_contents ($filename); Echo OK, encryption complete! "

Instance 2

The code is as follows

Copy Code

<?php function randabc ($length = "") {//return random string $str = "ABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZ"; Return Str_shuffle ($STR); } $filename = ' dam.php '; $T _k1=randabc ()/With secret key 1 $T _k2=randabc ()/With secret key 2 $vstr =file_get_contents ($filename);//files to be encrypted $v 1=base64_encode ($VSTR); $c =strtr ($v 1, $T _k1, $T _k2);//replace the corresponding character according to the key. $c = $T _k1. $T _k2. $c; $q 1= "o00o0o"; $q 2= "o0o000"; $q 3= "o0oo00"; $q 4= "oo0o00"; $q 5= "OO0000"; $q 6= "O00oo0"; $s = ' $ '. $q 6. ' =urldecode ("%6e1%7a%62%2f%6d%615%5c%76%740%6928%2d%70%78%75%71%79%2a6%6c%72%6b%64%679%5f%65%68%63%73%77%6f4%2b %6637%6A "); $ '. $q 1. ' =$ '. $q 6. ' {3}.$ '. $q 6. ' {6}.$ '. $q 6. ' {33}.$ '. $q 6. ' {30};$ '. $q 3. ' =$ '. $q 6. ' {33}.$ '. $q 6. ' {10}.$ '. $q 6. ' {24}.$ '. $q 6. ' {10}.$ '. $q 6. ' {24};$ '. $q 4. ' =$ '. $q 3. ' {0}.$ '. $q 6. ' {18}.$ '. $q 6. ' {3}.$ '. $q 3. ' {0}.$ '. $q 3. ' {1}.$ '. $q 6. ' {24};$ '. $q 5. ' =$ '. $q 6. ' {7}.$ '. $q 6. ' {13};$ '. $q 1. " =$ '. $q 6. ' {22}.$ '. $q 6. ' {36}.$ '. $q 6. ' {29}.$ '. $q 6. ' {26}.$ '. $q 6. ' {30}.$ '. $q 6. ' {32}.$ '. $q 6. ' {35}.$ '. $q 6. ' {26}.$ '. $q 6. ' {30};eval ($ '. $q 1. " ("'. Base64_encode (' $ ') $q 2." = "'. $c. '"; eval ('?> '. $ ') $q 1. ' ($ '. $q 3. " ($ '. $q 4. " ($ '. $q 2. ', $ '. $q 5. ' *2), $ '. $q 4. ' ($ '. $q 2. ', $ '. $q 5. ', $ '. $q 5. '), $ '. $q 4. ' ($ '. $q 2. ', 0,$ '. $q 5 "))); '; $s = ' <?php '. $s. ' ?> '; echo "OK, encryption complete!" "; Generate the encrypted PHP file $FPP 1 = fopen (' dam.php ', ' W '); Fwrite ($FPP 1, $s) or die (' Write file error '); ?>