1 files changed, 69 insertions, 0 deletions
diff --git a/old/botan/src/pubkey/dh/dh_core.cpp b/old/botan/src/pubkey/dh/dh_core.cpp
new file mode 100644
index 0000000..78a26a8
--- /dev/null
+++ b/old/botan/src/pubkey/dh/dh_core.cpp
@@ -0,0 +1,69 @@
+/*
+* PK Algorithm Core
+* (C) 1999-2007 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#include <botan/dh_core.h>
+#include <botan/numthry.h>
+#include <botan/pk_engine.h>
+#include <botan/parsing.h>
+#include <algorithm>
+
+namespace Botan {
+
+namespace {
+
+const u32bit BLINDING_BITS = BOTAN_PRIVATE_KEY_OP_BLINDING_BITS;
+
+}
+
+/*
+* DH_Core Constructor
+*/
+DH_Core::DH_Core(RandomNumberGenerator& rng,
+                 const DL_Group& group, const BigInt& x)
+   {
+   op = Engine_Core::dh_op(group, x);
+
+   const BigInt& p = group.get_p();
+
+   BigInt k(rng, std::min(p.bits()-1, BLINDING_BITS));
+
+   if(k != 0)
+      blinder = Blinder(k, power_mod(inverse_mod(k, p), x, p), p);
+   }
+
+/*
+* DH_Core Copy Constructor
+*/
+DH_Core::DH_Core(const DH_Core& core)
+   {
+   op = 0;
+   if(core.op)
+      op = core.op->clone();
+   blinder = core.blinder;
+   }
+
+/*
+* DH_Core Assignment Operator
+*/
+DH_Core& DH_Core::operator=(const DH_Core& core)
+   {
+   delete op;
+   if(core.op)
+      op = core.op->clone();
+   blinder = core.blinder;
+   return (*this);
+   }
+
+/*
+* DH Operation
+*/
+BigInt DH_Core::agree(const BigInt& i) const
+   {
+   return blinder.unblind(op->agree(blinder.blind(i)));
+   }
+
+}