Initial revision

1 files changed, 32 insertions, 0 deletions

diff --git a/modexppc.h b/modexppc.h
new file mode 100644
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--- /dev/null
+++ b/modexppc.h
@@ -0,0 +1,32 @@
+#ifndef CRYPTOPP_MODEXPPC_H
+#define CRYPTOPP_MODEXPPC_H
+
+#include "modarith.h"
+#include "eprecomp.h"
+#include "smartptr.h"
+#include "pubkey.h"
+
+NAMESPACE_BEGIN(CryptoPP)
+
+class ModExpPrecomputation : public DL_GroupPrecomputation<Integer>
+{
+public:
+	// DL_GroupPrecomputation
+	bool NeedConversions() const {return true;}
+	Element ConvertIn(const Element &v) const {return m_mr->ConvertIn(v);}
+	virtual Element ConvertOut(const Element &v) const {return m_mr->ConvertOut(v);}
+	const AbstractGroup<Element> & GetGroup() const {return m_mr->MultiplicativeGroup();}
+	Element BERDecodeElement(BufferedTransformation &bt) const {return Integer(bt);}
+	void DEREncodeElement(BufferedTransformation &bt, const Element &v) const {v.DEREncode(bt);}
+
+	// non-inherited
+	void SetModulus(const Integer &v) {m_mr.reset(new MontgomeryRepresentation(v));}
+	const Integer & GetModulus() const {return m_mr->GetModulus();}
+
+private:
+	value_ptr<MontgomeryRepresentation> m_mr;
+};
+
+NAMESPACE_END
+
+#endif