1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/os/security/cryptoplugins/cryptospiplugins/source/softwarecrypto/rsafunction.cpp	Fri Jun 15 03:10:57 2012 +0200
     1.3 @@ -0,0 +1,138 @@
     1.4 +/*
     1.5 +* Copyright (c) 2003-2009 Nokia Corporation and/or its subsidiary(-ies).
     1.6 +* All rights reserved.
     1.7 +* This component and the accompanying materials are made available
     1.8 +* under the terms of the License "Eclipse Public License v1.0"
     1.9 +* which accompanies this distribution, and is available
    1.10 +* at the URL "http://www.eclipse.org/legal/epl-v10.html".
    1.11 +*
    1.12 +* Initial Contributors:
    1.13 +* Nokia Corporation - initial contribution.
    1.14 +*
    1.15 +* Contributors:
    1.16 +*
    1.17 +* Description: 
    1.18 +*
    1.19 +*/
    1.20 +
    1.21 +
    1.22 +#include <bigint.h>
    1.23 +#include "keys.h"
    1.24 +#include <asymmetrickeys.h>
    1.25 +#include <cryptospi/cryptospidef.h>
    1.26 +#include <cryptospi/cryptoparams.h>
    1.27 +#include "rsafunction.h"
    1.28 +#include "mont.h"
    1.29 +
    1.30 +using namespace CryptoSpi;
    1.31 +
    1.32 +// Public Encrypt
    1.33 +void RSAFunction::EncryptL(const CKey& aPublicKey,
    1.34 +	const TInteger& aInput, RInteger& aOutput)
    1.35 +	{
    1.36 +	const TInteger& N = aPublicKey.GetBigIntL(KRsaKeyParameterNUid);
    1.37 +	const TInteger& E = aPublicKey.GetBigIntL(KRsaKeyParameterEUid);
    1.38 +	FunctionL(N, E, aInput, aOutput);
    1.39 +	}
    1.40 +
    1.41 +// Private Decrypt
    1.42 +void RSAFunction::DecryptL(const CKey& aPrivateKey, const TInteger& aInput, RInteger& aOutput)
    1.43 +	{
    1.44 +	if (aPrivateKey.KeyProperty().iKeyType == KRsaPrivateKeyStandardUid)
    1.45 +		{
    1.46 +		const TInteger& N = aPrivateKey.GetBigIntL(KRsaKeyParameterNUid);
    1.47 +		const TInteger& D = aPrivateKey.GetBigIntL(KRsaKeyParameterDUid);
    1.48 +		FunctionL(N, D, aInput, aOutput);
    1.49 +		}
    1.50 +	else if (aPrivateKey.KeyProperty().iKeyType == KRsaPrivateKeyCRTUid)
    1.51 +		{
    1.52 +		FunctionCRTL(aPrivateKey, aInput, aOutput);
    1.53 +		}
    1.54 +	else
    1.55 +		{
    1.56 +		User::Leave(KErrNotSupported);
    1.57 +		}
    1.58 +	}
    1.59 +
    1.60 +// Private Encrypt
    1.61 +void RSAFunction::SignL(const CKey& aPrivateKey, const TInteger& aInput, RInteger& aOutput)
    1.62 +	{
    1.63 +	if (aPrivateKey.KeyProperty().iKeyType == KRsaPrivateKeyStandardUid)
    1.64 +		{
    1.65 +		const TInteger& N = aPrivateKey.GetBigIntL(KRsaKeyParameterNUid);
    1.66 +		const TInteger& D = aPrivateKey.GetBigIntL(KRsaKeyParameterDUid);
    1.67 +		FunctionL(N, D, aInput, aOutput);
    1.68 +		}
    1.69 +	else if (aPrivateKey.KeyProperty().iKeyType == KRsaPrivateKeyCRTUid)
    1.70 +		{
    1.71 +		FunctionCRTL(aPrivateKey, aInput, aOutput);
    1.72 +		}
    1.73 +	else
    1.74 +	{
    1.75 +		User::Leave(KErrNotSupported);
    1.76 +	}
    1.77 +}
    1.78 +
    1.79 +// Public Decrypt
    1.80 +void RSAFunction::VerifyL(const CKey& aPublicKey,
    1.81 +	const TInteger& aInput, RInteger& aOutput)
    1.82 +	{
    1.83 +	const TInteger& N = aPublicKey.GetBigIntL(KRsaKeyParameterNUid);
    1.84 +	const TInteger& E = aPublicKey.GetBigIntL(KRsaKeyParameterEUid);
    1.85 +	FunctionL(N, E, aInput, aOutput);
    1.86 +	}
    1.87 +	
    1.88 +// The RSA Trapdoor Function
    1.89 +void RSAFunction::FunctionL(const TInteger& aModulus, const TInteger& aExponent, 
    1.90 +							 const TInteger& aBase, RInteger& aOutput)
    1.91 +	{
    1.92 +	IsInputValidL(aBase, aModulus);
    1.93 +
    1.94 +	aOutput = TInteger::ModularExponentiateL(aBase, aExponent, aModulus);
    1.95 +	}
    1.96 +
    1.97 +// The CRT version of the RSA Trapdoor Function
    1.98 +void RSAFunction::FunctionCRTL(const CKey& aPrivateKey,
    1.99 +								const TInteger& aInput, RInteger& aOutput)
   1.100 +	{
   1.101 +	const TInteger& N = aPrivateKey.GetBigIntL(KRsaKeyParameterNUid);
   1.102 +	IsInputValidL(aInput, N);
   1.103 +
   1.104 +	const TInteger& P = aPrivateKey.GetBigIntL(KRsaKeyParameterPUid);
   1.105 +	const TInteger& Q = aPrivateKey.GetBigIntL(KRsaKeyParameterQUid);
   1.106 +	const TInteger& DP = aPrivateKey.GetBigIntL(KRsaKeyParameterDPUid);
   1.107 +	const TInteger& DQ = aPrivateKey.GetBigIntL(KRsaKeyParameterDQUid);
   1.108 +	const TInteger& QInv = aPrivateKey.GetBigIntL(KRsaKeyParameterQInvUid);
   1.109 +
   1.110 +	CMontgomeryStructure* montP = CMontgomeryStructure::NewLC(P);
   1.111 +	CMontgomeryStructure* montQ = CMontgomeryStructure::NewLC(Q);
   1.112 +	
   1.113 +	// m1 = c^(dP) mod(p)
   1.114 +	RInteger inputReduced = aInput.ModuloL(P);
   1.115 +	CleanupStack::PushL(inputReduced);
   1.116 +	const TInteger& m1 = montP->ExponentiateL(inputReduced, DP);
   1.117 +	CleanupStack::PopAndDestroy(&inputReduced);
   1.118 +
   1.119 +	// m2 = c^(dQ) mod(Q)
   1.120 +	inputReduced = aInput.ModuloL(Q);
   1.121 +	CleanupStack::PushL(inputReduced);
   1.122 +	const TInteger& m2 = montQ->ExponentiateL(inputReduced, DQ);
   1.123 +	CleanupStack::PopAndDestroy(&inputReduced);
   1.124 +	
   1.125 +	// Calculate CRT
   1.126 +	// h = (m1-m2) qInv mod(p)
   1.127 +	RInteger h = m1.MinusL(m2);
   1.128 +	CleanupStack::PushL(h);
   1.129 +	h *= QInv;
   1.130 +	h %= P;
   1.131 +
   1.132 +	// m = m2 + q * h
   1.133 +	h *= Q;
   1.134 +	h += m2;
   1.135 +
   1.136 +	aOutput = h;
   1.137 +	CleanupStack::Pop(&h);
   1.138 +
   1.139 +	CleanupStack::PopAndDestroy(montQ);
   1.140 +	CleanupStack::PopAndDestroy(montP);
   1.141 +	}