Tamir.SharpSsh.jsch.Session.updateKeys C# (CSharp) Method

		private void updateKeys(KeyExchange kex) 
		{
			byte[] K=kex.getK();
			byte[] H=kex.getH();
			HASH hash=kex.getHash();

			String[] guess=kex._guess;

			if(session_id==null)
			{
				session_id=new byte[H.Length];
				System.Array.Copy(H, 0, session_id, 0, H.Length);
			}

			/*
			  Initial IV client to server:     HASH (K || H || "A" || session_id)
			  Initial IV server to client:     HASH (K || H || "B" || session_id)
			  Encryption key client to server: HASH (K || H || "C" || session_id)
			  Encryption key server to client: HASH (K || H || "D" || session_id)
			  Integrity key client to server:  HASH (K || H || "E" || session_id)
			  Integrity key server to client:  HASH (K || H || "F" || session_id)
			*/

			buf.Reset();
			buf.WriteMPInt(K);
			buf.WriteByte(H);
			buf.WriteByte((byte)0x41);
			buf.WriteByte(session_id);
			hash.update(buf.buffer, 0, buf.index);
			IVc2s=hash.digest();

			int j=buf.index-session_id.Length-1;

			buf.buffer[j]++;
			hash.update(buf.buffer, 0, buf.index);
			IVs2c=hash.digest();

			buf.buffer[j]++;
			hash.update(buf.buffer, 0, buf.index);
			Ec2s=hash.digest();

			buf.buffer[j]++;
			hash.update(buf.buffer, 0, buf.index);
			Es2c=hash.digest();

			buf.buffer[j]++;
			hash.update(buf.buffer, 0, buf.index);
			MACc2s=hash.digest();

			buf.buffer[j]++;
			hash.update(buf.buffer, 0, buf.index);
			MACs2c=hash.digest();

			try
			{
				s2ccipher = (Cipher)System.Activator.CreateInstance(System.Type.GetType(getConfig(guess[KeyExchange.PROPOSAL_ENC_ALGS_STOC])));
				while(s2ccipher.getBlockSize()>Es2c.Length)
				{
					buf.Reset();
					buf.WriteMPInt(K);
					buf.WriteByte(H);
					buf.WriteByte(Es2c);
					hash.update(buf.buffer, 0, buf.index);
					byte[] foo=hash.digest();
					byte[] bar=new byte[Es2c.Length+foo.Length];
					System.Array.Copy(Es2c, 0, bar, 0, Es2c.Length);
					System.Array.Copy(foo, 0, bar, Es2c.Length, foo.Length);
					Es2c=bar;
				}
				s2ccipher.init(Cipher.DECRYPT_MODE, Es2c, IVs2c);
				cipher_size=s2ccipher.getIVSize();
				s2cmac = (MAC)System.Activator.CreateInstance(System.Type.GetType(getConfig(guess[KeyExchange.PROPOSAL_MAC_ALGS_STOC])));
				s2cmac.init(MACs2c);
				mac_buf=new byte[s2cmac.getBlockSize()];

				c2scipher = (Cipher)System.Activator.CreateInstance(System.Type.GetType(getConfig(guess[KeyExchange.PROPOSAL_ENC_ALGS_CTOS])));
				while(c2scipher.getBlockSize()>Ec2s.Length)
				{
					buf.Reset();
					buf.WriteMPInt(K);
					buf.WriteByte(H);
					buf.WriteByte(Ec2s);
					hash.update(buf.buffer, 0, buf.index);
					byte[] foo=hash.digest();
					byte[] bar=new byte[Ec2s.Length+foo.Length];
					System.Array.Copy(Ec2s, 0, bar, 0, Ec2s.Length);
					System.Array.Copy(foo, 0, bar, Ec2s.Length, foo.Length);
					Ec2s=bar;
				}
				c2scipher.init(Cipher.ENCRYPT_MODE, Ec2s, IVc2s);

				c2smac = (MAC)System.Activator.CreateInstance(System.Type.GetType(getConfig(guess[KeyExchange.PROPOSAL_MAC_ALGS_CTOS])));
				c2smac.init(MACc2s);

				if(!(guess[KeyExchange.PROPOSAL_COMP_ALGS_CTOS] == "none"))
				{
					String foo=getConfig(guess[KeyExchange.PROPOSAL_COMP_ALGS_CTOS]);
					if(foo!=null)
					{
						try
						{
							deflater = (Compression)System.Activator.CreateInstance(System.Type.GetType(foo));
							int level=6;
							try{ level=System.Convert.ToInt32(getConfig("compression_level"));}
							catch(Exception){ }
							deflater.init(Compression.DEFLATER, level);
						}
						catch(Exception)
						{
							System.Console.Error.WriteLine(foo+" isn't accessible.");
						}
					}
				}
				else
				{
					if(deflater!=null)
					{
						deflater=null;
					}
				}
				if(guess[KeyExchange.PROPOSAL_COMP_ALGS_STOC] != "none")
				{
					String foo=getConfig(guess[KeyExchange.PROPOSAL_COMP_ALGS_STOC]);
					if(foo!=null)
					{
						try
						{
							inflater = (Compression)System.Activator.CreateInstance(System.Type.GetType(foo));
							inflater.init(Compression.INFLATER, 0);
						}
						catch(Exception)
						{
							System.Console.Error.WriteLine(foo+" isn't accessible.");
						}
					}
				}
				else
				{
					if(inflater!=null)
					{
						inflater=null;
					}
				}
			}
			catch(Exception e){ System.Console.Error.WriteLine("updatekeys: "+e); }
		}