PHP encryption method and decryption method
Test file
test.php
<?php echo "hello world."; ?>
1. Encryption method:
<?php /* eval() 函数把字符串按照 PHP 代码来计算。该字符串必须是合法的 PHP 代码,且必须以分号结尾。 strtr() 字符替换 把字符串中的字符 "ia" 替换为 "eo":strtr("Hilla Warld","ia","eo"); */ function T_rndstr($length = "") { //返回随机字符串 $str = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; if ($length == "") { return str_shuffle($str); } else { return substr(str_shuffle($str), -$length); } } $T_k1 = T_rndstr(); //随机密匙1 $T_k2 = T_rndstr(); //随机密匙2 $vstr = file_get_contents("./test.php"); //要加密的文件 $v1 = base64_encode($vstr); $c = strtr($v1, $T_k1, $T_k2); //根据密匙替换对应字符 $c = $T_k1 . $T_k2 . $c; //$qn变量功能下面会讲解 $isqs = 3; if ($isqs == "1") { // 1 取随机字符串为变量名 $q = T_rndstr(); // 随机字符串 $q1 = substr($q, 2, 3); $q2 = substr($q, 10, 10); $q3 = substr($q, 20, 12); $q4 = substr($q, 30, 10); $q5 = substr($q, 40, 8); $q6 = substr($q, 5, 5); } else if ($isqs == "2") { // 2 为小写l和1组成,开头必须是字母 $q1 = "ll11l1l1"; $q2 = "l1lll11l"; $q3 = "ll1l1lll"; $q4 = "l1lll1l1"; $q5 = "l1l1ll11"; $q6 = "ll111l1l"; } else { // 大写O与数字0组成基本变量 $q1 = "O00O0O"; $q2 = "O0O000"; $q3 = "O0OO00"; $q4 = "OO0O00"; $q5 = "OO0000"; $q6 = "O00OO0"; } $keystr = 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"); /* 字符串,里面必须要有变量所需的字符,比如 base64_decode n1zb/ma5\vt0i28-pxuqy*6lrkdg9_ehcswo4+f37j $q1 = base $q3 = strtr $q4 = substr $q5 = 52 -> ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz 长度 $q1 .= 64_decode -> base64_decode */ $s = '$' . $q6 . '=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"); $' . $q1 . '=$' . $q6 . '{3}.$' . $q6 . '{6}.$' . $q6 . '{33}.$' . $q6 . '{30}; $' . $q3 . '=$' . $q6 . '{33}.$' . $q6 . '{10}.$' . $q6 . '{24}.$' . $q6 . '{10}.$' . $q6 . '{24}; $' . $q4 . '=$' . $q3 . '{0}.$' . $q6 . '{18}.$' . $q6 . '{3}.$' . $q3 . '{0}.$' . $q3 . '{1}.$' . $q6 . '{24}; $' . $q5 . '=$' . $q6 . '{7}.$' . $q6 . '{13}; $' . $q1 . '.=$' . $q6 . '{22}.$' . $q6 . '{36}.$' . $q6 . '{29}.$' . $q6 . '{26}.$' . $q6 . '{30}.$' . $q6 . '{32}.$' . $q6 . '{35}.$' . $q6 . '{26}.$' . $q6 . '{30}; eval($' . $q1 . '("' . base64_encode('$' . $q2 . '="' . $c . '";eval(\'?>\'.$' . $q1 . '($' . $q3 . '($' . $q4 . '($' . $q2 . ',$' . $q5 . '*2),$' . $q4 . '($' . $q2 . ',$' . $q5 . ',$' . $q5 . '),$' . $q4 . '($' . $q2 . ',0,$' . $q5 . '))));') . '"));'; echo $s; file_put_contents('./test_encode.php', '<?php '.$s.'?>'); ?>
Generate TEST_ENCODE.PHP file after running encryption
<?php $O00OO0=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"); $O00O0O=$O00OO0{3}.$O00OO0{6}.$O00OO0{33}.$O00OO0{30}; $O0OO00=$O00OO0{33}.$O00OO0{10}.$O00OO0{24}.$O00OO0{10}.$O00OO0{24}; $OO0O00=$O0OO00{0}.$O00OO0{18}.$O00OO0{3}.$O0OO00{0}.$O0OO00{1}.$O00OO0{24}; $OO0000=$O00OO0{7}.$O00OO0{13}; $O00O0O.=$O00OO0{22}.$O00OO0{36}.$O00OO0{29}.$O00OO0{26}.$O00OO0{30}.$O00OO0{32}.$O00OO0{35}.$O00OO0{26}.$O00OO0{30}; eval($O00O0O("JE8wTzAwMD0iTGhxQk16QW5Zc29qUlVmSVhKZVBGSFF2Q2FwRWtOVFpHY2lXdWxtYmdkclZ5S3R3RFNPeER2Z2pick1mT1hreXVHaFlTVW5FcFF3b1B0Y2lLQ2VSTkhkWlZhVElGc0FMeGxxV3ptSkJFejlXdFFNQ1BkTUZZUGphTzJ2b1lQVWtSWkJYSXhqM0kzVVhSUDRkSlcwbFl6OCt6d2s9IjtldmFsKCc/PicuJE8wME8wTygkTzBPTzAwKCRPTzBPMDAoJE8wTzAwMCwkT08wMDAwKjIpLCRPTzBPMDAoJE8wTzAwMCwkT08wMDAwLCRPTzAwMDApLCRPTzBPMDAoJE8wTzAwMCwwLCRPTzAwMDApKSkpOw==")); ?>
Analysis
<?php // 所有的$O00OO等等都是变量!!! /* 将 %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%6 解码成 n1zb/ma5\vt0i28-pxuqy*6lrkdg9_ehcswo4+f37j 并赋值给$O00OO0 */ $O00OO0=urldecode("%6E1%7A%62%2F%6D%615%5C%76%740%6928%2D%70%78%75%71%79%2A6%6C%72%6B%64%679%5F%65%68%63%73%77%6F4%2B%6637%6A"); // 从$O00OO0及其他变量字符串中获取对应字符后组成新的字符串,并赋值给对应的变量 // 例如 $O00OO0{3} 代表 n1zb/ma5\vt0i28-pxuqy*6lrkdg9_ehcswo4+f37j 字符串中的第三个字符,b // $O00O0O = "base" $O00O0O=$O00OO0{3}.$O00OO0{6}.$O00OO0{33}.$O00OO0{30}; // $O0OO00 = "strtr" $O0OO00=$O00OO0{33}.$O00OO0{10}.$O00OO0{24}.$O00OO0{10}.$O00OO0{24}; // $OO0O00 = "substr" $OO0O00=$O0OO00{0}.$O00OO0{18}.$O00OO0{3}.$O0OO00{0}.$O0OO00{1}.$O00OO0{24}; // $OO0000 = "52" $OO0000=$O00OO0{7}.$O00OO0{13}; // $O00O0O = "base64_decode" $O00O0O.=$O00OO0{22}.$O00OO0{36}.$O00OO0{29}.$O00OO0{26}.$O00OO0{30}.$O00OO0{32}.$O00OO0{35}.$O00OO0{26}.$O00OO0{30}; // 之后通过eval执行php代码 eval($O00O0O("JE8wTzAwMD0iTGhxQk16QW5Zc29qUlVmSVhKZVBGSFF2Q2FwRWtOVFpHY2lXdWxtYmdkclZ5S3R3RFNPeER2Z2pick1mT1hreXVHaFlTVW5FcFF3b1B0Y2lLQ2VSTkhkWlZhVElGc0FMeGxxV3ptSkJFejlXdFFNQ1BkTUZZUGphTzJ2b1lQVWtSWkJYSXhqM0kzVVhSUDRkSlcwbFl6OCt6d2s9IjtldmFsKCc/PicuJE8wME8wTygkTzBPTzAwKCRPTzBPMDAoJE8wTzAwMCwkT08wMDAwKjIpLCRPTzBPMDAoJE8wTzAwMCwkT08wMDAwLCRPTzAwMDApLCRPTzBPMDAoJE8wTzAwMCwwLCRPTzAwMDApKSkpOw==")); /* eval会执行后面的PHP代码 第一步为解码 $O00O0O 为 "base64_decode"。 即对后面的字符串进行base64解码 JE8wTzAwMD0iTGhxQk16QW5Zc29qUlVmSVhKZVBGSFF2Q2FwRWtOVFpHY2lXdWxtYmdkclZ5S3R3RFNPeER2Z2pick1mT1hreXVHaFlTVW5FcFF3b1B0Y2lLQ2VSTkhkWlZhVElGc0FMeGxxV3ptSkJFejlXdFFNQ1BkTUZZUGphTzJ2b1lQVWtSWkJYSXhqM0kzVVhSUDRkSlcwbFl6OCt6d2s9IjtldmFsKCc/PicuJE8wME8wTygkTzBPTzAwKCRPTzBPMDAoJE8wTzAwMCwkT08wMDAwKjIpLCRPTzBPMDAoJE8wTzAwMCwkT08wMDAwLCRPTzAwMDApLCRPTzBPMDAoJE8wTzAwMCwwLCRPTzAwMDApKSkpOw== 解码后 $O0O000="LhqBMzAnYsojRUfIXJePFHQvCapEkNTZGciWulmbgdrVyKtwDSOxDvgjbrMfOXkyuGhYSUnEpQwoPtciKCeRNHdZVaTIFsALxlqWzmJBEz9WtQMCPdMFYPjaO2voYPUkRZBXIxj3I3UXRP4dJW0lYz8+zwk="; eval('?>'.$O00O0O($O0OO00($OO0O00($O0O000,$OO0000*2),$OO0O00($O0O000,$OO0000,$OO0000),$OO0O00($O0O000,0,$OO0000)))); 第二步是执行解码后的代码 解码后为另外一份代码,根据加密算法可知$O0O000变量的值为密钥1+密钥2+源代码编码并进行替换后的字符串, 这边先将替换掉的字符串还原回去,之后再进行base64_decode进行解码,即可获得原来的代码!!! 注意:由于源代码已经包含<?php ?>,所以这边必须加入'?>' */ ?>
2. Decryption method
<?php // 加密的文件格式必须固定!! /* $O00OO0=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"); $O00O0O=$O00OO0{3}.$O00OO0{6}.$O00OO0{33}.$O00OO0{30}; $O0OO00=$O00OO0{33}.$O00OO0{10}.$O00OO0{24}.$O00OO0{10}.$O00OO0{24}; $OO0O00=$O0OO00{0}.$O00OO0{18}.$O00OO0{3}.$O0OO00{0}.$O0OO00{1}.$O00OO0{24}; $OO0000=$O00OO0{7}.$O00OO0{13}; $O00O0O.=$O00OO0{22}.$O00OO0{36}.$O00OO0{29}.$O00OO0{26}.$O00OO0{30}.$O00OO0{32}.$O00OO0{35}.$O00OO0{26}.$O00OO0{30}; eval($O00O0O("JE8wTzAwMD0iTmV5SElCamZRdk......1UYVNuUUpnY21UYVVoOCtoTm89IjtldmFsKCc/=="));?> */ // 要解密的文件,去掉php标识 $encode_sourcecode = file_get_contents("./test_e.php"); $encode_sourcecode = str_replace('<?php','', $encode_sourcecode); $encode_sourcecode = str_replace('?>','', $encode_sourcecode); // 提取第一次需要解密的内容 // 即JE8wTzAwMD0iTmV5SElCamZRdk......1UYVNuUUpnY21UYVVoOCtoTm89IjtldmFsKCc/== echo '</br></br>------------------------------$encode_sourcecode_content</br>'; $start = strripos($encode_sourcecode, '("') + 2; $end = strripos($encode_sourcecode, '")'); $encode_sourcecode_content = substr($encode_sourcecode, $start, $end - $start); echo $encode_sourcecode_content; // 解密加密部分的代码后的内容 // $O0O000="NeyHIBjfQvDMwo......JoSptgMdl3M3JgSKQTiB0nuh8+hNo="; eval('......OO0000)))); echo '</br></br>------------------------------$decode_sourcecode_content</br>'; $decode_sourcecode_content = base64_decode($encode_sourcecode_content); echo $decode_sourcecode_content; // 解密后还是一个加密的代码,需要再次解码,所以要再次提取需要被解密的内容出来 // 即NeyHIBjfQvDMwo......JoSptgMdl3M3JgSKQTiB0nuh8+hNo= echo '</br></br>------------------------------$decode_sourcecode_content_encode_content</br>'; $start = stripos($decode_sourcecode_content, '"') + 1; $end = strripos($decode_sourcecode_content, '"') ; $decode_sourcecode_content_encode_content = substr($decode_sourcecode_content, $start, $end - $start); echo $decode_sourcecode_content_encode_content; // 根据加密规则,替换字符并解码,即可得到原文件 echo '</br></br>------------------------------$decode_sourcecode_content_encode_content</br>'; $origin_content = base64_decode(strtr( substr($decode_sourcecode_content_encode_content, 104), substr($decode_sourcecode_content_encode_content, 52, 52), substr($decode_sourcecode_content_encode_content, 0, 52))); var_dump($origin_content); file_put_contents('./test_origin.php', $origin_content); ?>
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