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Auto calc pad offset on BoxUp test page

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This commit is contained in:
Greg Edwards 2014-05-16 20:12:14 -04:00
parent 15bbba55db
commit 86cdf830a7
1 changed files with 25 additions and 5 deletions
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30
gts/test/BoxUp.aspx.cs
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@ -21,19 +21,24 @@ namespace PkmnFoundations.GTS.debug
}
private static byte[] PAD = new byte[256];
protected void btnSend_Click(object sender, EventArgs e)
{
phDecoded.Visible = false;
byte[] data = fuBox.FileBytes;
FileStream s = File.Open(Server.MapPath("~/Box Upload Xor Pad.bin"), FileMode.Open);
byte[] pad = new byte[s.Length];
s.Read(pad, 0, pad.Length);
s.Read(PAD, 0, PAD.Length);
s.Close();
int padOffset = Convert.ToInt32(txtOffset.Text);
for (int x = 6; x < data.Length; x++)
if (txtOffset.Text.Length > 0)
{
data[x] ^= pad[(x + padOffset) % 256];
int padOffset = Convert.ToInt32(txtOffset.Text);
Encrypt(data, padOffset);
}
else
{
Decrypt(data);
}
litDecoded.Text = RenderHex(data.ToHexStringLower());
@ -56,5 +61,20 @@ namespace PkmnFoundations.GTS.debug
}
return builder.ToString();
}
public static void Encrypt(byte[] data, int padOffset)
{
// encrypt and decrypt are the same operation...
for (int x = 6; x < data.Length; x++)
{
data[x] ^= PAD[(x + padOffset) % 256];
}
}
public static void Decrypt(byte[] data)
{
int padOffset = (Array.IndexOf(PAD, data[6]) + 250) % 256;
Encrypt(data, padOffset);
}
}
}