1 files changed, 79 insertions, 0 deletions
diff --git a/src/libzrtpcpp/crypto/TwoCFB.cpp b/src/libzrtpcpp/crypto/TwoCFB.cpp
new file mode 100755
index 0000000..be3dda4
--- /dev/null
+++ b/src/libzrtpcpp/crypto/TwoCFB.cpp
@@ -0,0 +1,79 @@
+/*
+  Copyright (C) 2011 by Werner Dittmann
+
+  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
+
+ * In addition, as a special exception, the copyright holders give
+ * permission to link the code of portions of this program with the
+ * OpenSSL library under certain conditions as described in each
+ * individual source file, and distribute linked combinations
+ * including the two.
+ * You must obey the GNU General Public License in all respects
+ * for all of the code used other than OpenSSL.  If you modify
+ * file(s) with this exception, you may extend this exception to your
+ * version of the file(s), but you are not obligated to do so.  If you
+ * do not wish to do so, delete this exception statement from your
+ * version.  If you delete this exception statement from all source
+ * files in the program, then also delete it here.
+ */
+
+/** Copyright (C) 2011
+ *
+ * @author  Werner Dittmann <Werner.Dittmann@t-online.de>
+ */
+
+#include <string.h>
+
+#include <libzrtpcpp/crypto/twoCFB.h>
+#include <libzrtpcpp/crypto/twofish.h>
+
+static int initialized = 0;
+
+void twoCfbEncrypt(uint8_t* key, int32_t keyLength, uint8_t* IV, uint8_t *data,
+                   int32_t dataLength)
+{
+    Twofish_key keyCtx;
+    int usedBytes = 0;
+
+    if (!initialized) {
+        Twofish_initialise();
+        initialized = 1;
+    }
+
+    memset(&keyCtx, 0, sizeof(Twofish_key));
+    Twofish_prepare_key(key, keyLength, &keyCtx);
+
+    Twofish_cfb128_encrypt(&keyCtx, (Twofish_Byte*)data, (Twofish_Byte*)data,
+			   (size_t)dataLength, (Twofish_Byte*)IV, &usedBytes);
+}
+
+
+void twoCfbDecrypt(uint8_t* key, int32_t keyLength, const uint8_t* IV, uint8_t *data,
+                   int32_t dataLength)
+{
+    Twofish_key keyCtx;
+    int usedBytes = 0;
+
+    if (!initialized) {
+        Twofish_initialise();
+        initialized = 1;
+    }
+
+    memset(&keyCtx, 0, sizeof(Twofish_key));
+    Twofish_prepare_key(key, keyLength, &keyCtx);
+
+    Twofish_cfb128_decrypt(&keyCtx, (Twofish_Byte*)data, (Twofish_Byte*)data, 
+			   (size_t)dataLength, (Twofish_Byte*)IV, &usedBytes);
+}