Added libnettle and libgmp support.

libnettle and libgmp is used by default. Old implementation uses
libgcrypt as default. If more and more Linux distributions offer
libnettle linked GnuTLS, then this change decrease library dependency
against libgcrypt and libgpg-error.  The current library detection for
libnettle and libgmp is very simple, just use AC_SEARCH_LIBS.
util::generateRandomData() was written using SimpleRandomizer, thus no
external library dependency from this function.

1 files changed, 59 insertions, 0 deletions

diff --git a/src/LibnettleARC4Encryptor.h b/src/LibnettleARC4Encryptor.h
new file mode 100644
index 00000000..bc71f781
--- /dev/null
+++ b/src/LibnettleARC4Encryptor.h
@@ -0,0 +1,59 @@
+/* <!-- copyright */
+/*
+ * aria2 - The high speed download utility
+ *
+ * Copyright (C) 2011 Tatsuhiro Tsujikawa
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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 --> */
+#ifndef D_LIBNETTLE_ARC4_ENCRYPTOR_H
+#define D_LIBNETTLE_ARC4_ENCRYPTOR_H
+
+#include "common.h"
+#include "LibnettleARC4Context.h"
+
+namespace aria2 {
+
+class ARC4Encryptor {
+private:
+  LibnettleARC4Context ctx_;
+public:
+  ARC4Encryptor();
+
+  ~ARC4Encryptor();
+
+  void init(const unsigned char* key, size_t keyLength);
+
+  void encrypt(unsigned char* out, size_t outLength,
+               const unsigned char* in, size_t inLength);
+};
+
+} // namespace aria2
+
+#endif // D_LIBNETTLE_ARC4_ENCRYPTOR_H