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我试图对第三方项目使用的base64编码的应用程序进行逆向工程,所以我可以创建一个自定义用户界面。我的方法在一个例子中取得了成功,但在其他例子中似乎并未达到标准(少数字符不太正确)。数据库中base64解码/编码不一致
AQAAAAAAGQBec2lwOigwMjAxMjM0NTZbMC05XSspQC4qFwBzaXA6MDIwMTIyMTEzQDEyNy4wLjAuMQAA
^^实际base64编码
AQAAAAAAEABec2lwOigwMjAxMjM0NTZbMC05XSspQC4qEwBzaXA6MDIwMTIyMTEzQDEyNy4wLjAuMQoA
,以配合PHP方法
由于控制字符^^最好的尝试,我实现了一些JSON编码,以使其更容易识别正在用于变量的字符串。该字符串与本例匹配,但base64编码结果与预期的实际不同。
$actualfour = 'AQAAAAAAGQBec2lwOigwMjAxMjM0NTZbMC05XSspQC4qFwBzaXA6MDIwMTIyMTEzQDEyNy4wLjAuMQAA';
echo "".$actualfour;
echo "<br />";
$four = chr(01);
$four .= chr(00);
$four .= chr(00);
$four .= chr(00);
$four .= chr(00);
$four .= chr(00);
$four .= chr(16);
$four .= chr(00);
$four .= '^sip:(02[0-9]+)@.*';
$four .= chr(19);
$four .= chr(00);
$four .= 'sip:[email protected]
'.chr(00);
$jsonfour = json_encode($four);
echo "unencoded: ".$jsonfour;
echo "<br />";
$encodefour = base64_encode($four);
echo "".$encodefour;
echo "<br />";
$jsonencodefour = json_encode(base64_decode($encodefour));
echo "encoded: ".$jsonencodefour;
echo "<br />";
if ($encodefour != $actualfour) { echo "FAIL"; } else { echo "PASS"; }
^^代码方法
AQAAAAAAGQBec2lwOigwMjAxMjM0NTZbMC05XSspQC4qFwBzaXA6MDIwMTIyMTEzQDEyNy4wLjAuMQAA
unencoded: "\u0001\u0000\u0000\u0000\u0000\u0000\u0010\u0000^sip:(02[0-9]+)@.*\u0013\u0000sip:[email protected]\n\u0000"
AQAAAAAAEABec2lwOigwMjAxMjM0NTZbMC05XSspQC4qEwBzaXA6MDIwMTIyMTEzQDEyNy4wLjAuMQoA
encoded: "\u0001\u0000\u0000\u0000\u0000\u0000\u0010\u0000^sip:(02[0-9]+)@.*\u0013\u0000sip:[email protected]\n\u0000"
FAIL
^^输出