2010-11-11 Tatsuhiro Tsujikawa <t-tujikawa@users.sourceforge.net>

Replaced MessageDigestContext with MessageDigest.  Cleaned up
	unnecessary functions in MessageDigestHelper.
	* src/BtPieceMessage.cc
	* src/Checksum.h
	* src/DHTTokenTracker.cc
	* src/DownloadCommand.cc
	* src/DownloadCommand.h
	* src/HashFuncEntry.h
	* src/IteratableChecksumValidator.cc
	* src/IteratableChecksumValidator.h
	* src/IteratableChunkChecksumValidator.cc
	* src/IteratableChunkChecksumValidator.h
	* src/LibgcryptMessageDigestImpl.cc
	* src/LibgcryptMessageDigestImpl.h
	* src/LibsslMessageDigestImpl.cc
	* src/LibsslMessageDigestImpl.h
	* src/MSEHandshake.cc
	* src/MSEHandshake.h
	* src/Makefile.am
	* src/MessageDigest.cc
	* src/MessageDigest.h
	* src/MessageDigestHelper.cc
	* src/MessageDigestHelper.h
	* src/MessageDigestImpl.h
	* src/MetalinkParserController.cc
	* src/Piece.cc
	* src/Piece.h
	* src/UTMetadataDataExtensionMessage.cc
	* src/bittorrent_helper.cc
	* src/messageDigest.cc: Removed
	* src/messageDigest.h: Removed
	* src/util.cc
	* src/version_usage.cc
	* test/BittorrentHelperTest.cc
	* test/GZipDecoderTest.cc
	* test/GZipDecodingStreamFilterTest.cc
	* test/IteratableChecksumValidatorTest.cc
	* test/IteratableChunkChecksumValidatorTest.cc
	* test/Makefile.am
	* test/MessageDigestHelperTest.cc
	* test/MessageDigestTest.cc
	* test/Metalink2RequestGroupTest.cc
	* test/MetalinkProcessorTest.cc
	* test/PieceTest.cc
	* test/TestUtil.cc
	* test/TestUtil.h
	* test/UTMetadataDataExtensionMessageTest.cc
	* test/UTMetadataPostDownloadHandlerTest.cc

src/MessageDigest.cc

@@ -0,0 +1,178 @@
+/* <!-- copyright */
+/*
+ * aria2 - The high speed download utility
+ *
+ * Copyright (C) 2010 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 "MessageDigest.h"
+#include "MessageDigestImpl.h"
+#include "util.h"
+#include "array_fun.h"
+
+namespace aria2 {
+
+namespace {
+struct HashTypeEntry {
+  std::string hashType;
+  int strength;
+  HashTypeEntry(const std::string& hashType, int strength):
+    hashType(hashType), strength(strength) {}
+};
+} // namespace
+
+namespace {
+HashTypeEntry hashTypes[] = {
+  HashTypeEntry("sha-1", 1),
+  HashTypeEntry("sha-256", 2),
+  HashTypeEntry("md5", 0)
+};
+} // namespace aria2
+
+MessageDigest::MessageDigest()
+{}
+
+MessageDigest::~MessageDigest()
+{}
+
+SharedHandle<MessageDigest> MessageDigest::sha1()
+{
+  SharedHandle<MessageDigest> md(new MessageDigest());
+  md->pImpl_ = MessageDigestImpl::sha1();
+  return md;
+}
+
+SharedHandle<MessageDigest> MessageDigest::create(const std::string& hashType)
+{
+  SharedHandle<MessageDigest> md(new MessageDigest());
+  md->pImpl_ = MessageDigestImpl::create(hashType);
+  return md;
+}
+
+bool MessageDigest::supports(const std::string& hashType)
+{
+  return MessageDigestImpl::supports(hashType);
+}
+
+std::string MessageDigest::getSupportedHashTypeString()
+{
+  std::string s;
+  for(HashTypeEntry* i = vbegin(hashTypes), *eoi = vend(hashTypes); i != eoi;
+      ++i) {
+    if(MessageDigestImpl::supports(i->hashType)) {
+      if(!s.empty()) {
+        s += ", ";
+      }
+      s += i->hashType;
+    }
+  }
+  return s;
+}
+
+size_t MessageDigest::getDigestLength(const std::string& hashType)
+{
+  return MessageDigestImpl::getDigestLength(hashType);
+}
+
+namespace {
+class FindHashTypeEntry {
+private:
+  const std::string& hashType_;
+public:
+  FindHashTypeEntry(const std::string& hashType):hashType_(hashType)
+  {}
+
+  bool operator()(const HashTypeEntry& entry) const
+  {
+    return hashType_ == entry.hashType;
+  }
+};
+} // namespace
+
+bool MessageDigest::isStronger(const std::string& lhs, const std::string& rhs)
+{
+  HashTypeEntry* lEntry = std::find_if(vbegin(hashTypes), vend(hashTypes),
+                                       FindHashTypeEntry(lhs));
+  HashTypeEntry* rEntry = std::find_if(vbegin(hashTypes), vend(hashTypes),
+                                       FindHashTypeEntry(rhs));
+  if(lEntry == vend(hashTypes) || rEntry == vend(hashTypes)) {
+    return false;
+  }
+  return lEntry->strength > rEntry->strength;
+}
+
+bool MessageDigest::isValidHash
+(const std::string& hashType, const std::string& hexDigest)
+{
+  return util::isHexDigit(hexDigest) &&
+    supports(hashType) && getDigestLength(hashType)*2 == hexDigest.size();
+}
+
+std::string MessageDigest::getCanonicalHashType(const std::string& hashType)
+{
+  if("sha1" == hashType) {
+    return "sha-1";
+  } else if("sha256" == hashType) {
+    return "sha-256";
+  } else {
+    return hashType;
+  }
+}
+
+size_t MessageDigest::getDigestLength() const
+{
+  return pImpl_->getDigestLength();
+}
+
+void MessageDigest::reset()
+{
+  pImpl_->reset();
+}
+
+void MessageDigest::update(const void* data, size_t length)
+{
+  pImpl_->update(data, length);
+}
+
+void MessageDigest::digest(unsigned char* md)
+{
+  pImpl_->digest(md);
+}
+
+std::string MessageDigest::hexDigest()
+{
+  size_t length = pImpl_->getDigestLength();
+  array_ptr<unsigned char> buf(new unsigned char[length]);
+  pImpl_->digest(buf);
+  std::string hd = util::toHex(buf, length);
+  return hd;
+}
+
+} // namespace aria2