From 7aff1e4cb053394db57c2814d5fe1e6493e0cc75 Mon Sep 17 00:00:00 2001
From: watcherhd <watcherhd@e753b5eb-9565-29b2-b5c5-2cc6f99dfbcb>
Date: Sat, 26 Nov 2011 14:19:43 +0000
Subject: Project folders rename part 2

git-svn-id: http://miranda-plugins.googlecode.com/svn/trunk@214 e753b5eb-9565-29b2-b5c5-2cc6f99dfbcb
---
 Dbx_tree/encryption/ARC4.cpp | 129 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 129 insertions(+)
 create mode 100644 Dbx_tree/encryption/ARC4.cpp

(limited to 'Dbx_tree/encryption/ARC4.cpp')

diff --git a/Dbx_tree/encryption/ARC4.cpp b/Dbx_tree/encryption/ARC4.cpp
new file mode 100644
index 0000000..7f3780e
--- /dev/null
+++ b/Dbx_tree/encryption/ARC4.cpp
@@ -0,0 +1,129 @@
+/*
+
+dbx_tree: tree database driver for Miranda IM
+
+Copyright 2007-2008 Michael "Protogenes" Kunz,
+
+This program is free software; you can redistribute it and/or
+modify it under the terms of the GNU General Public License
+as published by the Free Software Foundation; either version 2
+of the License, or (at your option) any later version.
+
+This program 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 General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+
+*/
+
+#include "ARC4.h"
+#include <string.h>
+
+const wchar_t * ARC4::Name()
+{
+	return cName;
+}
+const wchar_t * ARC4::Description()
+{
+	return cDescription;
+}
+const uint32_t  ARC4::BlockSizeBytes()
+{
+	return cBlockSizeBytes;
+}
+const bool      ARC4::IsStreamCipher()
+{
+	return cIsStreamCipher;
+}
+
+ARC4::ARC4()
+{
+
+}
+ARC4::~ARC4()
+{
+
+}
+
+CCipher::TCipherInterface* ARC4::Create() 
+{
+	return (new ARC4())->m_Interface;
+}
+
+void ARC4::SetKey(void* Key, uint32_t KeyLength)
+{	
+	uint8_t swapbyte;
+	uint8_t index1;
+	uint8_t index2;
+	unsigned int i;
+
+	uint8_t * k = (uint8_t *) Key;
+
+	for (i = 0; i < 256; ++i)
+		State[i] = i;
+
+	x = 0;
+	y = 0;
+	index1 = 0;
+	index2 = 0;
+	for (i = 0; i < 256; ++i)
+	{
+		index2 = (k[index1] + State[i] + index2) & 0xff;
+		swapbyte = State[i];
+		State[i] = State[index2];
+		State[index2] = swapbyte;
+		index1 = (index1 + 1) % KeyLength;
+	}
+
+	for (i = 0; i < 3742; ++i)
+		Stream();
+
+	Backx = x;
+	Backy = y;
+	memcpy(BackState, State, sizeof(State));
+}
+
+inline uint8_t ARC4::Stream()
+{
+	uint8_t swapbyte;
+
+	x = (x + 1) & 0xff;
+	y = (State[x] + y) & 0xff;
+
+	swapbyte = State[x];
+	State[x] = State[y];
+	State[y] = swapbyte;
+
+	return State[ (State[x] + State[y]) & 0xff ];
+}
+
+void ARC4::Encrypt(void* Data, uint32_t Size, uint32_t Nonce, uint32_t StartByte)
+{	
+	uint8_t * dat = (uint8_t *) Data;
+	x = Backx;
+	y = Backy;
+	memcpy(State, BackState, sizeof(State));
+
+	for (unsigned int i = (Nonce + (Nonce >> 8) + (Nonce >> 16) + (Nonce >> 24)) & 0x1ff; i > 0; --i)
+		Stream();
+
+	while (Size > 0)
+	{
+		(*dat) = (*dat) ^ Stream();
+		--Size;
+		++dat;
+	}
+}
+void ARC4::Decrypt(void* Data, uint32_t Size, uint32_t Nonce, uint32_t StartByte)
+{
+	Encrypt(Data, Size, Nonce, StartByte);
+}
+
+extern "C" __declspec(dllexport) const TCipherInfo* CipherInfo(void * Reserved)
+{
+	return &ARC4::cCipherInfo;
+}
-- 
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