mirror of
https://github.com/jellyfin/jellyfin.git
synced 2025-11-03 19:17:24 -05:00
69 lines
1.7 KiB
C#
69 lines
1.7 KiB
C#
// This code is derived from jcifs smb client library <jcifs at samba dot org>
|
|
// Ported by J. Arturo <webmaster at komodosoft dot net>
|
|
//
|
|
// This library is free software; you can redistribute it and/or
|
|
// modify it under the terms of the GNU Lesser General Public
|
|
// License as published by the Free Software Foundation; either
|
|
// version 2.1 of the License, or (at your option) any later version.
|
|
//
|
|
// This library is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
// Lesser General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU Lesser General Public
|
|
// License along with this library; if not, write to the Free Software
|
|
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
namespace SharpCifs.Util
|
|
{
|
|
public class Rc4
|
|
{
|
|
internal byte[] S;
|
|
|
|
internal int I;
|
|
|
|
internal int J;
|
|
|
|
public Rc4()
|
|
{
|
|
}
|
|
|
|
public Rc4(byte[] key)
|
|
{
|
|
Init(key, 0, key.Length);
|
|
}
|
|
|
|
public virtual void Init(byte[] key, int ki, int klen)
|
|
{
|
|
S = new byte[256];
|
|
for (I = 0; I < 256; I++)
|
|
{
|
|
S[I] = unchecked((byte)I);
|
|
}
|
|
for (I = J = 0; I < 256; I++)
|
|
{
|
|
J = (J + key[ki + I % klen] + S[I]) & unchecked(0xff);
|
|
byte t = S[I];
|
|
S[I] = S[J];
|
|
S[J] = t;
|
|
}
|
|
I = J = 0;
|
|
}
|
|
|
|
public virtual void Update(byte[] src, int soff, int slen, byte[] dst, int doff)
|
|
{
|
|
int slim;
|
|
slim = soff + slen;
|
|
while (soff < slim)
|
|
{
|
|
I = (I + 1) & unchecked(0xff);
|
|
J = (J + S[I]) & unchecked(0xff);
|
|
byte t = S[I];
|
|
S[I] = S[J];
|
|
S[J] = t;
|
|
dst[doff++] = unchecked((byte)(src[soff++] ^ S[(S[I] + S[J]) & unchecked(0xff)]));
|
|
}
|
|
}
|
|
}
|
|
}
|