lucidiot
/
kaitai_struct_csharp_runtime
1
0
Fork 0
Code Issues Pull Requests Releases Activity

Implemented multi-byte XOR processing

This commit is contained in:
Daniel Walder 2016-07-24 17:05:00 +10:00
parent e3b89666cd
commit 9f60c18de7
1 changed files with 26 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

28
KaitaiStream.cs
View File

@ -366,12 +366,36 @@ namespace Kaitai
return r;
}
public byte[] ProcessXorInt(byte[] value, int xorValue)
/// <summary>
/// Performs XOR processing with given data, XORing every byte of the input with a single value.
/// </summary>
/// <param name="value">The data toe process</param>
/// <param name="key">The key value to XOR with</param>
/// <returns>Processed data</returns>
public byte[] ProcessXor(byte[] value, int key)
{
var result = new byte[value.Length];
for (int i = 0; i < value.Length; i++)
{
result[i] = (byte) (value[i] ^ xorValue);
result[i] = (byte)(value[i] ^ key);
}
return result;
}
/// <summary>
/// Performs XOR processing with given data, XORing every byte of the input with a key
/// array, repeating from the beginning of the key array if necessary
/// </summary>
/// <param name="value">The data toe process</param>
/// <param name="key">The key array to XOR with</param>
/// <returns>Processed data</returns>
public byte[] ProcessXor(byte[] value, byte[] key)
{
var keyLen = key.Length;
var result = new byte[value.Length];
for (int i = 0, j = 0; i < value.Length; i++, j = (j + 1) % keyLen)
{
result[i] = (byte)(value[i] ^ key[j]);
}
return result;
}