--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cryptoplugins/cryptospiplugins/source/softwarecrypto/rsafunction.h	Fri Nov 06 13:21:00 2009 +0200
@@ -0,0 +1,85 @@
+/*
+* Copyright (c) 2003-2009 Nokia Corporation and/or its subsidiary(-ies).
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of the License "Eclipse Public License v1.0"
+* which accompanies this distribution, and is available
+* at the URL "http://www.eclipse.org/legal/epl-v10.html".
+*
+* Initial Contributors:
+* Nokia Corporation - initial contribution.
+*
+* Contributors:
+*
+* Description: 
+*
+*/
+
+
+/**
+ @file
+ @internalComponent
+ @released
+*/
+
+#ifndef __RSAFUNCTION_H__
+#define __RSAFUNCTION_H__
+
+#include <e32base.h>
+#include "keys.h"
+
+using namespace CryptoSpi;
+
+class TInteger;
+
+class RSAFunction
+	{
+public:
+	static inline TBool IsInputValid(const TInteger& aInput, 
+		const TInteger& aModulus);
+	static inline void IsInputValidL(const TInteger& aInput, 
+		const TInteger& aModulus);
+	static void EncryptL(const CKey& aPublicKey,
+		const TInteger& aInput, RInteger& aOutput);
+	static void DecryptL(const CKey& aPrivateKey,
+		const TInteger& aInput, RInteger& aOutput);
+	static void SignL(const CKey& aPrivateKey,
+		const TInteger& aInput, RInteger& aOutput);
+	static void VerifyL(const CKey& aPublicKey,
+		const TInteger& aInput, RInteger& aOutput);
+private:
+	static void FunctionL(const TInteger& aModulus, const TInteger& aExponent,
+		const TInteger& aBase, RInteger& aOutput);
+	static void FunctionCRTL(const CKey& aPrivateKey,
+		const TInteger& aInput, RInteger& aOutput);
+private:
+	RSAFunction(void);
+	};
+
+/** Computes whether a given message representative is within the valid bounds
+ * for a given modulus, i.e. whether the message is representative within [0,n-1].
+ * @param aInput The message representative.
+ * @param aModulus The modulus.
+ * @return TBool representing whether or not the message representative is
+ * valid.
+ */
+TBool RSAFunction::IsInputValid(const TInteger& aInput, 
+	const TInteger& aModulus)
+	{
+	//See HAC 8.3 1.b
+	//Message (input) must be in the interval [0,n-1] (inclusive)
+	if( aInput.IsNegative() || aInput >= aModulus )
+		return EFalse;
+	else
+		return ETrue;
+	}
+
+void RSAFunction::IsInputValidL(const TInteger& aInput,
+	const TInteger& aModulus)
+	{
+	if(!IsInputValid(aInput, aModulus))
+		User::Leave(KErrArgument);
+	}
+
+#endif
+