Symaptic: os/security/crypto/weakcryptospi/test/tplugins/src/rsaimpl.cpp@bde4ae8d615e

     1 /*

     2 * Copyright (c) 2006-2009 Nokia Corporation and/or its subsidiary(-ies).

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

     5 * under the terms of the License "Eclipse Public License v1.0"

     6 * which accompanies this distribution, and is available

     7 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

8 *

     9 * Initial Contributors:

    10 * Nokia Corporation - initial contribution.

    11 *

    12 * Contributors:

    13 *

    14 * Description:

    15 *

    16 */

    19 #include "rsaimpl.h"

    20 #include "rsafunction.h"

    21 #include "pluginconfig.h"

    22 #include <cryptopanic.h>

    23 #include <cryptostrength.h>

    24 #include <securityerr.h>

    26 using namespace SoftwareCrypto;

    28 /* CRSAImpl */

    29 CRSAImpl::CRSAImpl(

    30 	TUid aImplementationUid,

    31 	TUid aCryptoMode,

    32 	TUid aPadding) :

    33 	CAsymmetricCipherImpl(aCryptoMode, aPadding),

    34 	iImplementationUid(aImplementationUid)

    35 	{

    36 	}

    38 CRSAImpl* CRSAImpl::NewL(TUid aImplementationUid, const CKey& aKey, TUid aCryptoMode, TUid aPadding)

    39 	{

    40 	CRSAImpl* self = CRSAImpl::NewLC(aImplementationUid, aKey, aCryptoMode, aPadding);

    41 	CleanupStack::Pop(self);

    42 	return self;

    43 	}

    45 CRSAImpl* CRSAImpl::NewLC(TUid aImplementationUid, const CKey& aKey, TUid aCryptoMode, TUid aPadding)

    46 	{

    47 	CRSAImpl* self = new(ELeave) CRSAImpl(aImplementationUid, aCryptoMode, aPadding);

    48 	CleanupStack::PushL(self);

    49 	self->ConstructL(aKey);

    50 	return self;

    51 	}

    53 CRSAImpl::~CRSAImpl()

    54 	{

    55 	}

    57 TInt CRSAImpl::GetMaximumOutputLengthL() const

    58 	{

    59 	const TInteger& N = iKey->GetBigIntL(KRsaKeyParameterNUid);

    61 	if (iCryptoMode.iUid == KCryptoModeDecrypt)

    62 		return N.ByteCount() - iPadding->MinPaddingLength();

    63 	else

    64 		return N.ByteCount();

    65 	}

    67 TInt CRSAImpl::GetMaximumInputLengthL() const

    68 	{

    69 	const TInteger& N = iKey->GetBigIntL(KRsaKeyParameterNUid);

    71 	if (iCryptoMode.iUid == KCryptoModeEncrypt)

    72 		return N.ByteCount() - iPadding->MinPaddingLength();

    73 	else

    74 		return N.ByteCount();

    75 	}

    77 void CRSAImpl::ConstructL(const CKey& aKey)

    78 	{

    79 	const TInteger& N = aKey.GetBigIntL(KRsaKeyParameterNUid);

    80 	TCrypto::IsAsymmetricWeakEnoughL(N.BitCount());

    81 	CAsymmetricCipherImpl::ConstructL(aKey);

    83 	if (! IsValidKeyLengthL(N.ByteCount()))

    84 		{

    85 		User::Leave(KErrKeySize);

    86 		}

    87 	}

    89 CExtendedCharacteristics* CRSAImpl::CreateExtendedCharacteristicsL()

    90 	{

    91 	// All Symbian software plug-ins have unlimited concurrency, cannot be reserved

    92 	// for exclusive use and are not CERTIFIED to be standards compliant.

    93 	return CExtendedCharacteristics::NewL(KMaxTInt, EFalse);

    94 	}

    96 const CExtendedCharacteristics* CRSAImpl::GetExtendedCharacteristicsL()

    97 	{

    98 	return CRSAImpl::CreateExtendedCharacteristicsL();

    99 	}

   101 TUid CRSAImpl::ImplementationUid() const

   102 	{

   103 	return iImplementationUid;

   104 	}

   106 void CRSAImpl::EncryptL(const TDesC8& aInput, TDes8& aOutput) const

   107 	{

   108 	__ASSERT_DEBUG(aOutput.MaxLength() >= GetMaximumOutputLengthL(), User::Panic(KCryptoPanic, ECryptoPanicOutputDescriptorOverflow));

   109 	__ASSERT_DEBUG(aInput.Length() <= GetMaximumInputLengthL(), User::Panic(KCryptoPanic, ECryptoPanicInputTooLarge));

   111 	HBufC8* buf = HBufC8::NewLC(GetMaximumOutputLengthL());

   112 	TPtr8 ptr = buf->Des();

   114 	iPadding->PadL(aInput, ptr);

   115 	RInteger input = RInteger::NewL(ptr);

   116 	CleanupStack::PushL(input);

   118 	RInteger output;

   119 	RSAFunction::EncryptL(*iKey, input, output);

   120 	CleanupStack::PushL(output);

   122 	aOutput.Append(*(output.BufferLC()));

   123 	CleanupStack::PopAndDestroy(4, buf); //BufferLC, output, input, buf

   124 	}

   126 void CRSAImpl::DecryptL(const TDesC8& aInput, TDes8& aOutput) const

   127 	{

   128 	__ASSERT_DEBUG(aOutput.MaxLength() >= GetMaximumOutputLengthL(), User::Panic(KCryptoPanic, ECryptoPanicOutputDescriptorOverflow));

   129 	__ASSERT_DEBUG(aInput.Length() <= GetMaximumInputLengthL(), User::Panic(KCryptoPanic, ECryptoPanicInputTooLarge));

   131 	RInteger input = RInteger::NewL(aInput);

   132 	CleanupStack::PushL(input);

   134 	RInteger output;

   136 	RSAFunction::DecryptL(*iKey, input, output);

   137 	CleanupStack::PushL(output);

   139 	TPtrC8 ptr = *(output.BufferLC());

   140 	iPadding->UnPadL(ptr, aOutput);

   142 	CleanupStack::PopAndDestroy(3, &input); //BufferLC(), output, input

   143 	}

   145 void CRSAImpl::ProcessL(const TDesC8& aInput, TDes8& aOutput)

   146 	{

   147 	if (iCryptoMode.iUid == KCryptoModeEncrypt)

   148 		{

   149 		EncryptL(aInput, aOutput);

   150 		}

   151 	else

   152 		{

   153 		DecryptL(aInput, aOutput);

   154 		}

   155 	}

   157 TBool CRSAImpl::IsValidKeyLengthL(TInt aKeyBytes) const

   158 	{

   159 	if (aKeyBytes < 1)

   160 		return EFalse;

   162 	switch (iCryptoMode.iUid)

   163 		{

   164 		case KCryptoModeEncrypt:

   165 			// Check if GetMaximumInputLengthL() makes sense,

   166 			// if not the key length must be too small

   167 			if (GetMaximumInputLengthL() <= 0)

   168 				return EFalse;

   169 			break;

   171 		case KCryptoModeDecrypt:

   172 			// Check if GetMaximumOutputLengthL() makes sense,

   173 			// if not the key length must be too small

   174 			if (GetMaximumOutputLengthL() <= 0)

   175 				return EFalse;

   176 			break;

   177 		}

   178 	return ETrue;

   179 	}

author	sl@SLION-WIN7.fritz.box
	Fri, 15 Jun 2012 03:10:57 +0200
changeset 0	bde4ae8d615e
permissions	-rw-r--r--