diff options
| author | Vadim Dashevskiy <watcherhd@gmail.com> | 2012-05-15 10:38:20 +0000 |
|---|---|---|
| committer | Vadim Dashevskiy <watcherhd@gmail.com> | 2012-05-15 10:38:20 +0000 |
| commit | 48540940b6c28bb4378abfeb500ec45a625b37b6 (patch) | |
| tree | 2ef294c0763e802f91d868bdef4229b6868527de /plugins/Dbx_tree/encryption/ARC4.cpp | |
| parent | 5c350913f011e119127baeb32a6aedeb4f0d33bc (diff) | |
initial commit
git-svn-id: http://svn.miranda-ng.org/main/trunk@2 1316c22d-e87f-b044-9b9b-93d7a3e3ba9c
Diffstat (limited to 'plugins/Dbx_tree/encryption/ARC4.cpp')
| -rw-r--r-- | plugins/Dbx_tree/encryption/ARC4.cpp | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/plugins/Dbx_tree/encryption/ARC4.cpp b/plugins/Dbx_tree/encryption/ARC4.cpp new file mode 100644 index 0000000000..7f3780e6a2 --- /dev/null +++ b/plugins/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;
+}
|