crypto/weakcrypto/source/asymmetric/rsaencryptor.cpp
changeset 71 dd83586b62d6
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/crypto/weakcrypto/source/asymmetric/rsaencryptor.cpp	Fri Jun 11 15:32:35 2010 +0300
@@ -0,0 +1,97 @@
+/*
+* 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: 
+*
+*/
+
+
+#include <asymmetric.h>
+#include <asymmetrickeys.h>
+#include <bigint.h>
+#include <padding.h>
+#include <cryptostrength.h>
+#include <securityerr.h>
+#include <cryptopanic.h>
+#include "rsafunction.h"
+
+
+EXPORT_C CRSAPKCS1v15Encryptor* CRSAPKCS1v15Encryptor::NewL( 
+	const CRSAPublicKey& aKey)
+	{
+	CRSAPKCS1v15Encryptor* self = NewLC(aKey);
+	CleanupStack::Pop(self);
+	return self;
+	}
+
+EXPORT_C CRSAPKCS1v15Encryptor* CRSAPKCS1v15Encryptor::NewLC(
+	const CRSAPublicKey& aKey)
+	{
+	CRSAPKCS1v15Encryptor* self = new(ELeave) CRSAPKCS1v15Encryptor(aKey);
+	CleanupStack::PushL(self);
+	self->ConstructL();
+	return self;
+	}
+
+TInt CRSAPKCS1v15Encryptor::MaxInputLength(void) const
+	{
+	return MaxOutputLength() - iPadding->MinPaddingLength();
+	}
+
+TInt CRSAPKCS1v15Encryptor::MaxOutputLength() const
+	{
+	return iPublicKey.N().ByteCount();	
+	}
+
+void CRSAPKCS1v15Encryptor::EncryptL(const TDesC8& aInput, TDes8& aOutput)const
+	{
+	__ASSERT_DEBUG(aOutput.MaxLength() >= MaxOutputLength(), User::Panic(KCryptoPanic, ECryptoPanicOutputDescriptorOverflow));
+	__ASSERT_DEBUG(aInput.Length() <= MaxInputLength(), User::Panic(KCryptoPanic, ECryptoPanicInputTooLarge));
+
+	HBufC8* buf = HBufC8::NewLC(MaxOutputLength());
+	TPtr8 ptr = buf->Des();
+	
+	iPadding->DoPadL(aInput, ptr);
+	RInteger input = RInteger::NewL(ptr);
+	CleanupStack::PushL(input);
+	
+	RInteger output;
+	RSAFunction::EncryptL(iPublicKey, input, output);
+	CleanupStack::PushL(output);
+
+	aOutput.Append(*(output.BufferLC()));
+	CleanupStack::PopAndDestroy(4, buf); //BufferLC, output, input, buf
+	}
+
+CRSAPKCS1v15Encryptor::CRSAPKCS1v15Encryptor(const CRSAPublicKey& aKey) 
+	: iPublicKey(aKey)
+	{
+	}
+
+void CRSAPKCS1v15Encryptor::ConstructL(void)
+	{
+	iPadding = CPaddingPKCS1Encryption::NewL(MaxOutputLength());
+
+	// Check if MaxInputLength() makes sense, if not the key length must 
+	// be too small
+	if(MaxInputLength() <= 0)
+		{
+		User::Leave(KErrKeySize);
+		}
+	TCrypto::IsAsymmetricWeakEnoughL(iPublicKey.N().BitCount());
+	}
+
+CRSAPKCS1v15Encryptor::~CRSAPKCS1v15Encryptor(void)
+	{
+	delete iPadding;
+	}