[C#][developers] read sv.t & create a sv.t

[cyberninjah]

Here is a little snippet how to read the silkroad version from the sv.t
and create a sv.t in C#.

Thanks to pushedx for the explanation about the file structure.

        public static void WriteSVTFile(byte[] buffer, int newVersion)
        {
            pk2Reader.Blowfish bf = new pk2Reader.Blowfish(Encoding.ASCII.GetBytes("SILKROADVERSION"), 0, 8);
            Array.Reverse(buffer, 4, 4);
            Array.Reverse(buffer, 8, 4);
            bf.Decrypt(buffer, 4, buffer, 4, 8);
            Array.Reverse(buffer, 4, 4);
            Array.Reverse(buffer, 8, 4);

            int version;
            int.TryParse(Encoding.ASCII.GetString(buffer, 4, 4), out version);

            byte[] tmp = Encoding.ASCII.GetBytes(newVersion.ToString());

            tmp.CopyTo(buffer, 4);

            Array.Reverse(buffer, 8, 4);
            Array.Reverse(buffer, 4, 4);
            bf.Encrypt(buffer, 4, buffer, 4, 8);
            Array.Reverse(buffer, 8, 4);
            Array.Reverse(buffer, 4, 4);

            File.WriteAllBytes("sv.t", buffer);
        }

        public static uint ReadVersion(byte[] buffer)
        {
            pk2Reader.Blowfish bf = new pk2Reader.Blowfish(Encoding.ASCII.GetBytes("SILKROADVERSION"), 0, 8);
            Array.Reverse(buffer, 4, 4);
            Array.Reverse(buffer, 8, 4);
            bf.Decrypt(buffer, 4, buffer, 4, 8);
            Array.Reverse(buffer, 4, 4);
            Array.Reverse(buffer, 8, 4);


            int version;
            int.TryParse(Encoding.ASCII.GetString(buffer, 4, 4), out version);

            if (PatchInfo.lastClientVersion != 0)
            {
                PatchInfo.lastClientVersion = (uint)version;
            }

            return (uint)version;
        }

[qkuh]

Can be done more easily.

[tarek1500]

I tried your come for ReadVersion , but doesn't read version correctly , when Array.Reverse removed it read well

[onekyh]

Originally Posted by qkuh

Can be done more easily.

Yeah, but still. It works.


10/10.

[LemoniscooL]

i know this is sort of an old thread, but it deserves more thanks

[Thabo]

nice source

[spiele13]

Hey,

i know its an old thread, but i searched for two days now and i can't find anything.
Could you guys please post the defenition of Blowfish function Decrypt/Encrypt.

Greets, spiele13.

[DaxterSoul]

Originally Posted by spiele13

but i searched for two days

I'm sure you did.

Silkroad uses the Blowfish in ECB Mode.
You could either use the Blowfish class which is publicly available for use in various language from it's .
Or you use the one which pushedx included in his .

[spiele13]

Originally Posted by DaxterSoul

I'm sure you did.

Silkroad uses the Blowfish in ECB Mode.
You could either use the Blowfish class which is publicly available for use in various language from it's .
Or you use the one which pushedx included in his .

I did and i have the SilkroadSecurityApi, but there is no Decrypt/Encrypt function.
The bytes that are important are 4-12, i know that too. I tried to decode them but i failed. Thats why i ask here. :/

Thank you anyway for the answere.

[DaxterSoul]

Originally Posted by spiele13

I did and i have the SilkroadSecurityApi, but there is no Decrypt/Encrypt function.

Sometimes you need to think outside the box, because encrypt and decrypt are just names for a function.
,

Originally Posted by spiele13

The bytes that are important are 4-12, i know that too. I tried to decode them but i failed. Thats why i ask here. :/

There is a much simpler way to read them, you don't really need to fuzz with those indices that much.

Have a look at this , it might help you.

[spiele13]

Originally Posted by DaxterSoul

Sometimes you need to think outside the box, because encrypt and decrypt are just names for a function.
,





There is a much simpler way to read them, you don't really need to fuzz with those indices that much.

Have a look at this , it might help you.

Thank you very much. I did know that i could use Decode/Encode but they have less parameters, so i was not sure. My problem was that i read the file the wrong way and so every function of mine had a wrong buffer.

Thank you again for the helpful answers.

[DaxterSoul]

Originally Posted by spiele13

Thank you very much. I did know that i could use Decode/Encode but they have less parameters, so i was not sure.

You might need to read something about then, because this technique is heavily used everywhere in .NET.