1 files changed, 47 insertions, 0 deletions
diff --git a/botan/src/pubkey/if_algo/if_op.cpp b/botan/src/pubkey/if_algo/if_op.cpp
new file mode 100644
index 0000000..27aef45
--- /dev/null
+++ b/botan/src/pubkey/if_algo/if_op.cpp
@@ -0,0 +1,47 @@
+/*
+* IF (RSA/RW) Operation
+* (C) 1999-2007 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#include <botan/if_op.h>
+#include <botan/numthry.h>
+
+namespace Botan {
+
+/*
+* Default_IF_Op Constructor
+*/
+Default_IF_Op::Default_IF_Op(const BigInt& e, const BigInt& n, const BigInt&,
+                             const BigInt& p, const BigInt& q,
+                             const BigInt& d1, const BigInt& d2,
+                             const BigInt& c)
+   {
+   powermod_e_n = Fixed_Exponent_Power_Mod(e, n);
+
+   if(d1 != 0 && d2 != 0 && p != 0 && q != 0)
+      {
+      powermod_d1_p = Fixed_Exponent_Power_Mod(d1, p);
+      powermod_d2_q = Fixed_Exponent_Power_Mod(d2, q);
+      reducer = Modular_Reducer(p);
+      this->c = c;
+      this->q = q;
+      }
+   }
+
+/*
+* Default IF Private Operation
+*/
+BigInt Default_IF_Op::private_op(const BigInt& i) const
+   {
+   if(q == 0)
+      throw Internal_Error("Default_IF_Op::private_op: No private key");
+
+   BigInt j1 = powermod_d1_p(i);
+   BigInt j2 = powermod_d2_q(i);
+   j1 = reducer.reduce(sub_mul(j1, j2, c));
+   return mul_add(j1, q, j2);
+   }
+
+}