From 354bb40e75d94466e91fe6960523612c9d17ccfb Mon Sep 17 00:00:00 2001
From: Karen Arutyunov <karen@codesynthesis.com>
Date: Thu, 2 Nov 2017 23:11:29 +0300
Subject: Add implementation

---
 mysql/extra/yassl/taocrypt/src/dh.cpp | 103 ++++++++++++++++++++++++++++++++++
 1 file changed, 103 insertions(+)
 create mode 100644 mysql/extra/yassl/taocrypt/src/dh.cpp

(limited to 'mysql/extra/yassl/taocrypt/src/dh.cpp')

diff --git a/mysql/extra/yassl/taocrypt/src/dh.cpp b/mysql/extra/yassl/taocrypt/src/dh.cpp
new file mode 100644
index 0000000..615a8c6
--- /dev/null
+++ b/mysql/extra/yassl/taocrypt/src/dh.cpp
@@ -0,0 +1,103 @@
+/*
+   Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved.
+
+   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; version 2 of the License.
+
+   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; see the file COPYING. If not, write to the
+   Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
+   MA  02110-1301  USA.
+*/
+
+
+/* dh.cpp implements Diffie-Hellman support
+*/
+
+#include "runtime.hpp"
+#include "dh.hpp"
+#include "asn.hpp"
+#include <math.h>
+
+namespace TaoCrypt {
+
+
+namespace {  // locals
+
+unsigned int DiscreteLogWorkFactor(unsigned int n)
+{
+    // assuming discrete log takes about the same time as factoring
+    if (n<5)
+        return 0;
+    else
+        return (unsigned int)(2.4 * pow((double)n, 1.0/3.0) *
+                pow(log(double(n)), 2.0/3.0) - 5);
+}
+
+} // namespace locals
+
+
+// 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(), min(p_ - 1,
+        Integer::Power2(2*DiscreteLogWorkFactor(p_.BitCount())) ) );
+    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, word32
+               otherSz)
+{
+    const word32 bc(p_.ByteCount());
+    Integer x(priv, bc);
+    Integer y;
+    if (otherSz)
+        y.Decode(otherPub, otherSz);
+    else
+        y.Decode(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
-- 
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