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, 115 insertions, 0 deletions

diff --git a/src/LibnettleMessageDigestImpl.cc b/src/LibnettleMessageDigestImpl.cc
new file mode 100644
index 00000000..d8eac9b7
--- /dev/null
+++ b/src/LibnettleMessageDigestImpl.cc
@@ -0,0 +1,115 @@
+/* <!-- 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 --> */
+#include "LibnettleMessageDigestImpl.h"
+
+#include <algorithm>
+
+#include "array_fun.h"
+#include "HashFuncEntry.h"
+
+namespace aria2 {
+
+MessageDigestImpl::MessageDigestImpl(const nettle_hash* hashInfo)
+  : hashInfo_(hashInfo),
+    ctx_(new char[hashInfo->context_size])
+{
+  reset();
+}
+
+MessageDigestImpl::~MessageDigestImpl()
+{
+  delete [] ctx_;
+}
+
+SharedHandle<MessageDigestImpl> MessageDigestImpl::sha1()
+{
+  return SharedHandle<MessageDigestImpl>(new MessageDigestImpl(&nettle_sha1));
+}
+
+typedef HashFuncEntry<const nettle_hash*> CHashFuncEntry;
+typedef FindHashFunc<const nettle_hash*> CFindHashFunc;
+
+namespace {
+CHashFuncEntry hashFuncs[] = {
+  CHashFuncEntry("sha-1", &nettle_sha1),
+  CHashFuncEntry("sha-224", &nettle_sha224),
+  CHashFuncEntry("sha-256", &nettle_sha256),
+  CHashFuncEntry("sha-384", &nettle_sha384),
+  CHashFuncEntry("sha-512", &nettle_sha512),
+  CHashFuncEntry("md5", &nettle_md5)
+};
+} // namespace
+
+SharedHandle<MessageDigestImpl> MessageDigestImpl::create
+(const std::string& hashType)
+{
+  const nettle_hash* hashInfo =
+    getHashFunc(vbegin(hashFuncs), vend(hashFuncs), hashType);
+  return SharedHandle<MessageDigestImpl>(new MessageDigestImpl(hashInfo));
+}
+
+bool MessageDigestImpl::supports(const std::string& hashType)
+{
+  return vend(hashFuncs) != std::find_if(vbegin(hashFuncs), vend(hashFuncs),
+                                         CFindHashFunc(hashType));
+}
+
+size_t MessageDigestImpl::getDigestLength(const std::string& hashType)
+{
+  const nettle_hash* hashInfo =
+    getHashFunc(vbegin(hashFuncs), vend(hashFuncs), hashType);
+  return hashInfo->digest_size;
+}
+
+size_t MessageDigestImpl::getDigestLength() const
+{
+  return hashInfo_->digest_size;
+}
+
+void MessageDigestImpl::reset()
+{
+  hashInfo_->init(ctx_);
+}
+void MessageDigestImpl::update(const void* data, size_t length)
+{
+  hashInfo_->update(ctx_, length, static_cast<const uint8_t*>(data));
+}
+
+void MessageDigestImpl::digest(unsigned char* md)
+{
+  hashInfo_->digest(ctx_, getDigestLength(), md);
+}
+
+} // namespace aria2