掌上六安加密Api分析

api 逆向

PHP加密解密代码

<?php
        //Enter your code here, enjoy!
$uc_key="f4fna96cdnf27i8W9Jd7bV6T1sadf9z5Zcaaby0W6ob88raaf126OOo659HUhoji";
function rc4($key, $str) {
    $s = array();
	for ($i = 0; $i < 256; $i++) {
        $s[$i] = $i;
	}
	$j = 0;
    for ($i = 0; $i < 256; $i++) {
		$j = ($j + $s[$i] + ord($key[$i % strlen($key)])) % 256;
		$x = $s[$i];
		$s[$i] = $s[$j];
		$s[$j] = $x;
	}
	$i = 0;
    $j = 0;
	$res = '';
    for ($y = 0; $y < strlen($str); $y++) {
        $i = ($i + 1) % 256;
        $j = ($j + $s[$i]) % 256;
        $x = $s[$i];
		$s[$i] = $s[$j];
		$s[$j] = $x;
        $res .= $str[$y] ^ chr($s[($s[$i] + $s[$j]) % 256]);
    }
    return $res;
}
function decode($sourse, $key){
    $key = md5($key);
    $keya = md5(substr($key, 0, 16));
    $keyb = md5(substr($key, 16, 16));
    $cryptkey = $keya.md5($keya.substr($sourse, 0, 4));
    $body = rc4($cryptkey, base64_decode(substr($sourse,4)));
    return substr($body,26);
}
function encode($sourse, $key){
    $key = md5($key);
    $keya = md5(substr($key, 0, 16));
    $keyb = md5(substr($key, 16, 16));
    $keyc = "f4fn";
    $body = $keyc.base64_encode(rc4($keya.md5($keya.$keyc), "0000000000".substr(md5($sourse.$keyb), 0, 16).$sourse));
    return $body;
}
$result = decode($en_body, $uc_key);