Various encryption-related stuff.

[libdcp.git] / src / key.cc

diff --git a/src/key.cc b/src/key.cc
new file mode 100644 (file)
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+++ b/src/key.cc
@@ -0,0 +1,99 @@
+/*
+    Copyright (C) 2013 Carl Hetherington <cth@carlh.net>
+
+    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., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#include <sstream>
+#include <string>
+#include <iomanip>
+#include "AS_DCP.h"
+#include "KM_prng.h"
+#include "KM_util.h"
+#include "key.h"
+
+using std::string;
+using std::stringstream;
+using std::setw;
+using std::setfill;
+using namespace libdcp;
+
+Key::Key ()
+       : _value (new uint8_t[ASDCP::KeyLen])
+{
+       Kumu::FortunaRNG rng;
+       rng.FillRandom (_value, ASDCP::KeyLen);
+}
+
+Key::Key (uint8_t const * value)
+       : _value (new uint8_t[ASDCP::KeyLen])
+{
+       memcpy (_value, value, ASDCP::KeyLen);
+}
+
+Key::Key (string value)
+       : _value (new uint8_t[ASDCP::KeyLen])
+{
+       unsigned int length;
+       Kumu::hex2bin (value.c_str(), _value, ASDCP::KeyLen, &length);
+}
+
+Key::Key (Key const & other)
+       : _value (new uint8_t[ASDCP::KeyLen])
+{
+       memcpy (_value, other._value, ASDCP::KeyLen);
+}
+
+Key::~Key ()
+{
+       delete[] _value;
+}
+
+Key &
+Key::operator= (Key const & other)
+{
+       if (this == &other) {
+               return *this;
+       }
+       
+       memcpy (_value, other._value, ASDCP::KeyLen);
+       return *this;
+}
+
+string
+Key::hex () const
+{
+       stringstream g;
+       
+       for (unsigned int i = 0; i < ASDCP::KeyLen; ++i) {
+               g << setw(2) << setfill('0') << std::hex << static_cast<int> (_value[i]);
+       }
+
+       return g.str ();
+}
+
+bool
+libdcp::operator== (Key const & a, Key const & b)
+{
+       return memcmp (a.value(), b.value(), ASDCP::KeyLen) == 0;
+}
+
+bool
+libdcp::operator!= (Key const & a, Key const & b)
+{
+       return !(a == b);
+}
+