1 files changed, 85 insertions, 0 deletions
diff --git a/extra/yassl/taocrypt/src/dh.cpp b/extra/yassl/taocrypt/src/dh.cpp
new file mode 100644
index 00000000000..e5a6a562c52
--- /dev/null
+++ b/extra/yassl/taocrypt/src/dh.cpp
@@ -0,0 +1,85 @@
+/* dh.cpp                                
+ *
+ * Copyright (C) 2003 Sawtooth Consulting Ltd.
+ *
+ * This file is part of yaSSL.
+ *
+ * yaSSL 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.
+ *
+ * yaSSL 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ */
+
+
+/* dh.cpp implements Diffie-Hellman support
+*/
+
+#include "runtime.hpp"
+#include "dh.hpp"
+#include "asn.hpp"
+#include <cmath>
+
+namespace TaoCrypt {
+
+
+// Generate a DH Key Pair
+void DH::GenerateKeyPair(RandomNumberGenerator& rng, byte* priv, byte* pub)
+{
+    GeneratePrivate(rng, priv);
+    GeneratePublic(priv, pub);
+}
+
+
+// Generate private value
+void DH::GeneratePrivate(RandomNumberGenerator& rng, byte* priv)
+{
+    Integer x(rng, Integer::One(), p_ - 1);
+    x.Encode(priv, p_.ByteCount());
+}
+
+
+// Generate public value
+void DH::GeneratePublic(const byte* priv, byte* pub)
+{
+    const word32 bc(p_.ByteCount());
+    Integer x(priv, bc);
+    Integer y(a_exp_b_mod_c(g_, x, p_));
+    y.Encode(pub, bc);
+}
+
+
+// Generate Agreement
+void DH::Agree(byte* agree, const byte* priv, const byte* otherPub)
+{
+    const word32 bc(p_.ByteCount());
+    Integer x(priv, bc);
+    Integer y(otherPub, bc);
+
+    Integer z(a_exp_b_mod_c(y, x, p_));
+    z.Encode(agree, bc);
+}
+
+
+DH::DH(Source& source)
+{
+    Initialize(source);
+}
+
+
+void DH::Initialize(Source& source)
+{
+    DH_Decoder decoder(source);
+    decoder.Decode(*this);
+}
+
+
+} // namespace