Refactor the structure of source files:

* New src/ripple/crypto and src/ripple/protocol directories
* Merged src/ripple/common into src/ripple/basics
* Move resource/api files up a level
* Add headers for "include what you use"
* Normalized include guards
* Renamed to JsonFields.h
* Remove obsolete files
* Remove net.h unity header
* Remove resource.h unity header
* Removed some deprecated unity includes

src/ripple/crypto/impl/DHUtil.cpp

@@ -0,0 +1,54 @@
+//------------------------------------------------------------------------------
+/*
+    This file is part of rippled: https://github.com/ripple/rippled
+    Copyright (c) 2012, 2013 Ripple Labs Inc.
+
+    Permission to use, copy, modify, and/or distribute this software for any
+    purpose  with  or without fee is hereby granted, provided that the above
+    copyright notice and this permission notice appear in all copies.
+
+    THE  SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+    WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES  OF
+    MERCHANTABILITY  AND  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+    ANY  SPECIAL ,  DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+    WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
+    ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+//==============================================================================
+
+#include <ripple/crypto/DHUtil.h>
+
+namespace ripple {
+
+std::string DH_der_gen (int iKeyLength)
+{
+    DH*         dh  = 0;
+    int         iCodes;
+    std::string strDer;
+
+    do
+    {
+        dh  = DH_generate_parameters (iKeyLength, DH_GENERATOR_5, nullptr, nullptr);
+        iCodes  = 0;
+        DH_check (dh, &iCodes);
+    }
+    while (iCodes & (DH_CHECK_P_NOT_PRIME | DH_CHECK_P_NOT_SAFE_PRIME | DH_UNABLE_TO_CHECK_GENERATOR | DH_NOT_SUITABLE_GENERATOR));
+
+    strDer.resize (i2d_DHparams (dh, nullptr));
+
+    unsigned char* next = reinterpret_cast<unsigned char*> (&strDer[0]);
+
+    (void) i2d_DHparams (dh, &next);
+
+    return strDer;
+}
+
+DH* DH_der_load (std::string const& strDer)
+{
+    const unsigned char* pbuf   = reinterpret_cast<const unsigned char*> (&strDer[0]);
+
+    return d2i_DHparams (nullptr, &pbuf, strDer.size ());
+}
+
+}