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/*
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* Copyright (c) 2003-2009 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of the License "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:
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*
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*/
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#include <e32base.h>
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#include <padding.h>
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#include <securityerr.h>
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#include <cryptopanic.h>
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#include "paddingshim.h"
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/* CPaddingPKCS7 */
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EXPORT_C CPaddingPKCS7* CPaddingPKCS7::NewL(TInt aBlockBytes)
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{
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__ASSERT_ALWAYS(aBlockBytes > 0, User::Leave(KErrArgument));
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return CPaddingPKCS7Shim::NewL(aBlockBytes);
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}
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EXPORT_C CPaddingPKCS7* CPaddingPKCS7::NewLC(TInt aBlockBytes)
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{
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CPaddingPKCS7* self = CPaddingPKCS7::NewL(aBlockBytes);
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CleanupStack::PushL(self);
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return self;
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}
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EXPORT_C CPaddingPKCS7::CPaddingPKCS7(TInt aBlockBytes):CPadding(aBlockBytes)
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{
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}
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void CPaddingPKCS7::DoPadL(const TDesC8& aInput,TDes8& aOutput)
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{
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TInt paddingBytes = BlockSize()-(aInput.Length()%BlockSize());
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aOutput.Append(aInput);
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aOutput.SetLength(aOutput.Length()+paddingBytes);
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for (TInt i=1;i<=paddingBytes;i++)
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{
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aOutput[aOutput.Length()-i]=(TUint8)(paddingBytes);
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}
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}
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void CPaddingPKCS7::UnPadL(const TDesC8& aInput,TDes8& aOutput)
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{
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TUint inputLen = aInput.Length();
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TUint paddingLen = (TUint)(aInput[inputLen - 1]);
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if (paddingLen > inputLen)
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{
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User::Leave(KErrInvalidPadding);
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}
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TInt outlen = aInput.Length() - paddingLen;
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__ASSERT_DEBUG(aOutput.MaxLength() >= outlen, User::Panic(KCryptoPanic, ECryptoPanicOutputDescriptorOverflow));
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aOutput.Append(aInput.Left(outlen));
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for (TInt i=outlen;i<inputLen;i++)
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{
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//All padding bytes must equal the length of padding expected
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if (aInput[i]!=paddingLen)
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{
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User::Leave(KErrInvalidPadding);
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}
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}
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}
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TInt CPaddingPKCS7::MinPaddingLength(void) const
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{
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//if aInputBytes is 1 less than the blocksize then we get 1 byte of padding
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return 1;
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}
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TInt CPaddingPKCS7::MaxPaddedLength(TInt aInputBytes) const
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{
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TUint padBytes = BlockSize() - (aInputBytes % BlockSize());
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return padBytes + aInputBytes;
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}
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