1 files changed, 83 insertions, 0 deletions
diff --git a/src/pk/pubkey/rsa_op.cpp b/src/pk/pubkey/rsa_op.cpp
new file mode 100644
index 000000000..0b151bf3b
--- /dev/null
+++ b/src/pk/pubkey/rsa_op.cpp
@@ -0,0 +1,83 @@
+/*************************************************
+* IF (RSA/RW) Operation Source File              *
+* (C) 1999-2007 Jack Lloyd                       *
+*************************************************/
+
+#include <botan/eng_def.h>
+#include <botan/pow_mod.h>
+#include <botan/numthry.h>
+#include <botan/reducer.h>
+
+namespace Botan {
+
+namespace {
+
+/*************************************************
+* Default IF Operation                           *
+*************************************************/
+class Default_IF_Op : public IF_Operation
+   {
+   public:
+      BigInt public_op(const BigInt& i) const
+         { return powermod_e_n(i); }
+      BigInt private_op(const BigInt&) const;
+
+      IF_Operation* clone() const { return new Default_IF_Op(*this); }
+
+      Default_IF_Op(const BigInt&, const BigInt&, const BigInt&,
+                    const BigInt&, const BigInt&, const BigInt&,
+                    const BigInt&, const BigInt&);
+   private:
+      Fixed_Exponent_Power_Mod powermod_e_n, powermod_d1_p, powermod_d2_q;
+      Modular_Reducer reducer;
+      BigInt c, q;
+   };
+
+/*************************************************
+* 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);
+   }
+
+}
+
+/*************************************************
+* Acquire an IF op                               *
+*************************************************/
+IF_Operation* Default_Engine::if_op(const BigInt& e, const BigInt& n,
+                                    const BigInt& d, const BigInt& p,
+                                    const BigInt& q, const BigInt& d1,
+                                    const BigInt& d2, const BigInt& c) const
+   {
+   return new Default_IF_Op(e, n, d, p, q, d1, d2, c);
+   }
+
+}