need C# code to decode XOR string

Can anyone help me with a method in C# to decode a XOR encrypted string from second life? All my attempts so far have failed to get eh correct answer.

First off i should say i don't know c# but here is what i hacked together

I have to head out i'll fix this in a couple hours.

char [] XorBase64Strings(char [] s1, char[] s2)
{
byte [] out = new Byte[s1.Length];
byte [] s1 = new Byte[s1.Length];
byte [] s2 = new Byte[s2.Length];
s1 = System.Convert.FromBase64CharArray(s1);
s2 = System.Convert.FromBase64CharArray(s2);

long a = s1.length();
long b = 0;
while(b < a)
{
s1
}
return Convert.ToBase64CharArray()
}


def XorBase64Strings(s1, s2):
s1 = b64decode(s1) # internally this works with
s2 = b64decode(s2) # the decoded strings
while len(s2) < len(s1): s2 += s2 # repeat s2 until it's at least as long as s1
out = ""
for index in range(len(s1)): # take each character from s1
out += chr( ord(s1[index]) ^ ord(s2[index]) ) # and XOR it with one from s2
return b64encode(out)

Ok i am at work and sadly i did not bring a encoded string from SL with me to test with.

Below is the code i tried to use but it failed with SL XOR strings. works fine for its own but not SL's

                                private static string NormalStringToBase64String(string normalString)
		{
			Encoding asciiEncoding = Encoding.ASCII;
			byte[] byteArray = new byte[asciiEncoding.GetByteCount(normalString)];
			byteArray = asciiEncoding.GetBytes(normalString);

			// Perform Base64 transform.
			return Convert.ToBase64String(byteArray);
		}

		private static string Base64StringToNormalString(string base64String)
		{
			byte[] byteArray  = Convert.FromBase64String(base64String);
			Encoding asciiEncoding = Encoding.ASCII;
			return asciiEncoding.GetString(byteArray);
		}

		public static string EncodeXOR(string CodeKey, string text)
		{
			string CodeKey64 = NormalStringToBase64String(CodeKey);
			string text64 = NormalStringToBase64String(text);
			string output = PerformXOR(CodeKey64, text64);
			return NormalStringToBase64String(output);
		}

		public static string DecodeXOR(string CodeKey, string XORtext)
		{
			string CodeKey64 = NormalStringToBase64String(CodeKey);
			string text = Base64StringToNormalString(XORtext);
			string output = PerformXOR(CodeKey64, text);
			return Base64StringToNormalString(output);
		}

		//each char in the string is xor'd with another char, namely the key. to decrypt, just run the same function again
		private static string PerformXOR(string CodeKey, string DataIn)
		{
			char[] output = String.Copy(DataIn).ToCharArray();
			int cnt = 0;
			for (int i=0; i<DataIn.Length; i++)
			{
				output = (char)(DataIn ^ CodeKey[cnt]);
				cnt++;
				if(cnt >= CodeKey.Length)
				{
					cnt = 0;
				}
			}
			return new String(output);
		}

Just a few minor things, SL uses UTF-8 for it's encoding

Beyond that i don't see anything wrong with your code, but then as i said before... i've never writen anything in C# or uses the .net libraries so i i don't how the different functions work.
You should try to isolate any errors by using try-catch

		private static string NormalStringToBase64String(string normalString)
		{
			Encoding charEncoding = Encoding.UTF8;
			byte[] byteArray = new byte[asciiEncoding.GetByteCount(normalString)];
			byteArray = charEncoding.GetBytes(normalString);

			// Perform Base64 transform.
			return Convert.ToBase64String(byteArray);
		}

		private static string Base64StringToNormalString(string base64String)
		{
			Encoding charEncoding = Encoding.UTF8;
			byte[] byteArray  = Convert.FromBase64String(base64String);
			return charEncoding.GetString(byteArray);
		}

		public static string EncodeXOR(string CodeKey, string text)
		{
			string CodeKey64 = NormalStringToBase64String(CodeKey);
			string text64 = NormalStringToBase64String(text);
			string output = PerformXOR(CodeKey64, text64);
			return NormalStringToBase64String(output);
		}

		public static string DecodeXOR(string CodeKey, string XORtext)
		{
			string CodeKey64 = NormalStringToBase64String(CodeKey);
			string text = Base64StringToNormalString(XORtext);
			string output = PerformXOR(CodeKey64, text);
			return Base64StringToNormalString(output);
		}

		//each char in the string is xor'd with another char, namely the key. to decrypt, just run the same function again
		private static string PerformXOR(string CodeKey, string DataIn)
		{
			char[] output = String.Copy(DataIn).ToCharArray();
			int cnt = 0;
			for (int i=0; i<DataIn.Length; i++)
			{
				output = (char)(DataIn ^ CodeKey[cnt]);
				cnt++;
				if(cnt >= CodeKey.Length)
				{
					cnt = 0;
				}
			}
			return new String(output);
		}

Thanks i will try that tonight. The issues i seem to have when i debug my code seem to be realting to be when to and when no to do the base64 encode and decode. I could be wrong on that but thats when it looks like it all goes wrong.

I will have to wait till tonight when i can login and drop an object in SL that i can connect to to test it. I deleted my test object by mistake before i logged last night.

You could be write with the encodign beinghte problem as that would make sense

^^' it's unlikely that the encoding is the issue... but then again...

well the issue is mainly that the string ends up not being a valid base64 string. If i am encoding the caracters incorrectly it could be part of the problem.

Still not working. got all the base64 encode/decode working now so it is jus the XOR that is wrong

ok guys here is a progress update. I have it all work except for one small thing.

It seems that when encoding with XOR if the end of the second string that is passed in is reached the whole thing is repeated again. This would not be an issue except for the 5 extra characters they add between the end of the string and the restart of the string. These 5 characters seem to change based of the content of the string but are not effected by the first string passed into the function. So far i have only tested this with 4 letter strings for the second string.

so far i have been unable to work out how these 5 extra letters are generated. There must be a formula to it but i just can't spot it. can anyone help me out with this?

If anyone else is working on the same problem let me know maybe we can work together on this.

any hints, tips or maybe answers would be great!

ok guys someone must have worked this out for one of the languages can't anyone help me with a formula for the XOR encryption/decription and the extra characters added to the second string. it does nto need to be in C# i just need the info.