1 files changed, 46 insertions, 0 deletions
diff --git a/src/lib/pubkey/blinding.h b/src/lib/pubkey/blinding.h
new file mode 100644
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+++ b/src/lib/pubkey/blinding.h
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+/*
+* Blinding for public key operations
+* (C) 1999-2010 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#ifndef BOTAN_BLINDER_H__
+#define BOTAN_BLINDER_H__
+
+#include <botan/bigint.h>
+#include <botan/reducer.h>
+
+namespace Botan {
+
+/**
+* Blinding Function Object
+*/
+class BOTAN_DLL Blinder
+   {
+   public:
+      BigInt blind(const BigInt& x) const;
+      BigInt unblind(const BigInt& x) const;
+
+      bool initialized() const { return reducer.initialized(); }
+
+      Blinder() {}
+
+      /**
+      * Construct a blinder
+      * @param mask the forward (blinding) mask
+      * @param inverse_mask the inverse of mask (depends on algo)
+      * @param modulus of the group operations are performed in
+      */
+      Blinder(const BigInt& mask,
+              const BigInt& inverse_mask,
+              const BigInt& modulus);
+
+   private:
+      Modular_Reducer reducer;
+      mutable BigInt e, d;
+   };
+
+}
+
+#endif