I am trying to "decode" this following Base64 string:
OBFZDTcPCxlCKhdXCQ0kMQhKPh9uIgYIAQxALBtZAwUeOzcdcUEeW0dMO1kbPElWCV1ISFFKZ0kdWFlLAURPZhEFQVseXVtPOUUICVhMAzcfZ14AVEdIVVgfAUIBWVpOUlAeaUVMXFlKIy9rGUN0VF08Oz1POxFfTCcVFw1LMQNbBQYWAQ==
This is what I know about the string itself:
The original string is first passed through the following code:
private static string m000493(string p0, string p1)
{
StringBuilder builder = new StringBuilder(p0);
StringBuilder builder2 = new StringBuilder(p1);
StringBuilder builder3 = new StringBuilder(p0.Length);
int num = 0;
Label_0084:
while (num < builder.Length)
{
int num2 = 0;
while (num2 < p1.Length)
{
if ((num == builder.Length) || (num2 == builder2.Length))
{
MessageBox.Show("EH?");
goto Label_0084;
}
char ch = builder[num];
char ch2 = builder2[num2];
ch = (char)(ch ^ ch2);
builder3.Append(ch);
num2++;
num++;
}
}
return m0001cd(builder3.ToString());
}
The p1
part in the code is supposed to be the string "_p0lizei.
".
It is then converted to a Base64 string by the following code:
private static string m0001cd(string p0)
{
string str2;
try
{
byte[] buffer = new byte[p0.Length];
str2 = Convert.ToBase64String(Encoding.UTF8.GetBytes(p0));
}
catch (Exception exception)
{
throw new Exception("Error in base64Encode" + exception.Message);
}
return str2;
}
The question is, how do I decode the Base64 string so that I can find out what the original string is?
Simple:
byte[] data = Convert.FromBase64String(encodedString);
string decodedString = Encoding.UTF8.GetString(data);