2010-11-14 Tatsuhiro Tsujikawa <t-tujikawa@users.sourceforge.net>

	Added .cc file for classes/structs that only provided by header
	file. Defined non-POD classes' ctor, dtor in .cc file.  Moved
	implementation code in header file to .cc file for major
	classes/strucsts.

1 files changed, 165 insertions, 0 deletions

diff --git a/src/LibgcryptDHKeyExchange.cc b/src/LibgcryptDHKeyExchange.cc
new file mode 100644
index 00000000..e7347b01
--- /dev/null
+++ b/src/LibgcryptDHKeyExchange.cc
@@ -0,0 +1,165 @@
+/* <!-- 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 "LibgcryptDHKeyExchange.h"
+#include "DlAbortEx.h"
+#include "StringFormat.h"
+
+namespace aria2 {
+
+namespace {
+void handleError(gcry_error_t err)
+{
+  throw DL_ABORT_EX
+    (StringFormat("Exception in libgcrypt routine(DHKeyExchange class): %s",
+                  gcry_strerror(err)).str());
+}
+} // namespace
+
+DHKeyExchange::DHKeyExchange()
+  : keyLength_(0),
+    prime_(0),
+    generator_(0),
+    privateKey_(0),
+    publicKey_(0)
+{}
+
+DHKeyExchange::~DHKeyExchange()
+{
+  gcry_mpi_release(prime_);
+  gcry_mpi_release(generator_);
+  gcry_mpi_release(privateKey_);
+  gcry_mpi_release(publicKey_);
+}
+
+void DHKeyExchange::init(const unsigned char* prime, size_t primeBits,
+                         const unsigned char* generator,
+                         size_t privateKeyBits)
+{
+  gcry_mpi_release(prime_);
+  gcry_mpi_release(generator_);
+  gcry_mpi_release(privateKey_);
+  {
+    gcry_error_t r = gcry_mpi_scan(&prime_, GCRYMPI_FMT_HEX,
+                                   prime, 0, 0);
+    if(r) {
+      handleError(r);
+    }
+  }
+  {
+    gcry_error_t r = gcry_mpi_scan(&generator_, GCRYMPI_FMT_HEX,
+                                   generator, 0, 0);
+    if(r) {
+      handleError(r);
+    }
+  }
+  privateKey_ = gcry_mpi_new(0);
+  gcry_mpi_randomize(privateKey_, privateKeyBits, GCRY_STRONG_RANDOM);
+  keyLength_ = (primeBits+7)/8;
+}
+
+void DHKeyExchange::generatePublicKey()
+{
+  gcry_mpi_release(publicKey_);
+  publicKey_ = gcry_mpi_new(0);
+  gcry_mpi_powm(publicKey_, generator_, privateKey_, prime_);
+}
+
+size_t DHKeyExchange::getPublicKey(unsigned char* out, size_t outLength) const
+{
+  if(outLength < keyLength_) {
+    throw DL_ABORT_EX
+      (StringFormat
+       ("Insufficient buffer for public key. expect:%lu, actual:%lu",
+        static_cast<unsigned long>(keyLength_),
+        static_cast<unsigned long>(outLength)).str());
+  }
+  memset(out, 0, outLength);
+  size_t publicKeyBytes = (gcry_mpi_get_nbits(publicKey_)+7)/8;
+  size_t offset = keyLength_-publicKeyBytes;
+  size_t nwritten;
+  gcry_error_t r = gcry_mpi_print(GCRYMPI_FMT_USG, out+offset,
+                                  outLength-offset, &nwritten, publicKey_);
+  if(r) {
+    handleError(r);
+  }
+  return nwritten;
+}
+
+void DHKeyExchange::generateNonce(unsigned char* out, size_t outLength) const
+{
+  gcry_create_nonce(out, outLength);
+}
+
+size_t DHKeyExchange::computeSecret(unsigned char* out, size_t outLength,
+                                    const unsigned char* peerPublicKeyData,
+                                    size_t peerPublicKeyLength) const
+{
+  if(outLength < keyLength_) {
+    throw DL_ABORT_EX
+      (StringFormat("Insufficient buffer for secret. expect:%lu, actual:%lu",
+                    static_cast<unsigned long>(keyLength_),
+                    static_cast<unsigned long>(outLength)).str());
+  }
+  gcry_mpi_t peerPublicKey;
+  {
+    gcry_error_t r = gcry_mpi_scan(&peerPublicKey,
+                                   GCRYMPI_FMT_USG,
+                                   peerPublicKeyData,
+                                   peerPublicKeyLength,
+                                   0);
+    if(r) {
+      handleError(r);
+    }
+  }
+  gcry_mpi_t secret = gcry_mpi_new(0);
+  gcry_mpi_powm(secret, peerPublicKey, privateKey_, prime_);
+  gcry_mpi_release(peerPublicKey);
+
+  memset(out, 0, outLength);
+  size_t secretBytes = (gcry_mpi_get_nbits(secret)+7)/8;
+  size_t offset = keyLength_-secretBytes;
+  size_t nwritten;
+  {
+    gcry_error_t r = gcry_mpi_print(GCRYMPI_FMT_USG, out+offset,
+                                    outLength-offset, &nwritten, secret);
+    gcry_mpi_release(secret);
+    if(r) {
+      handleError(r);
+    }
+  }
+  return nwritten;
+}
+
+} // namespace aria2