1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/os/security/crypto/weakcrypto/source/padding/pkcs7.cpp	Fri Jun 15 03:10:57 2012 +0200
     1.3 @@ -0,0 +1,89 @@
     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 <e32base.h>
    1.23 +#include <padding.h>
    1.24 +#include <securityerr.h>
    1.25 +#include <cryptopanic.h>
    1.26 +
    1.27 +/* CPaddingPKCS7 */
    1.28 +EXPORT_C CPaddingPKCS7* CPaddingPKCS7::NewL(TInt aBlockBytes)
    1.29 +	{
    1.30 +	__ASSERT_ALWAYS(aBlockBytes > 0, User::Leave(KErrArgument));
    1.31 +	return new(ELeave)CPaddingPKCS7(aBlockBytes);
    1.32 +	}
    1.33 +
    1.34 +EXPORT_C CPaddingPKCS7* CPaddingPKCS7::NewLC(TInt aBlockBytes)
    1.35 +	{
    1.36 +	CPaddingPKCS7* self = CPaddingPKCS7::NewL(aBlockBytes);
    1.37 +	CleanupStack::PushL(self);
    1.38 +	return self;
    1.39 +	}
    1.40 +
    1.41 +EXPORT_C CPaddingPKCS7::CPaddingPKCS7(TInt aBlockBytes):CPadding(aBlockBytes)
    1.42 +	{
    1.43 +	}
    1.44 +
    1.45 +void CPaddingPKCS7::DoPadL(const TDesC8& aInput,TDes8& aOutput)
    1.46 +	{
    1.47 +	TInt paddingBytes = BlockSize()-(aInput.Length()%BlockSize());		
    1.48 +	aOutput.Append(aInput);
    1.49 +	aOutput.SetLength(aOutput.Length()+paddingBytes);
    1.50 +	for (TInt i=1;i<=paddingBytes;i++)
    1.51 +		{
    1.52 +		aOutput[aOutput.Length()-i]=(TUint8)(paddingBytes);
    1.53 +		}
    1.54 +	}
    1.55 +
    1.56 +void CPaddingPKCS7::UnPadL(const TDesC8& aInput,TDes8& aOutput)
    1.57 +	{
    1.58 +	TUint inputLen = aInput.Length();
    1.59 + 	TUint paddingLen = (TUint)(aInput[inputLen - 1]);
    1.60 +
    1.61 +	if (paddingLen > inputLen)
    1.62 + 		{
    1.63 + 		User::Leave(KErrInvalidPadding);
    1.64 + 		}
    1.65 +   
    1.66 +	TInt outlen = aInput.Length() - paddingLen;
    1.67 +
    1.68 +	__ASSERT_DEBUG(aOutput.MaxLength() >= outlen, User::Panic(KCryptoPanic, ECryptoPanicOutputDescriptorOverflow));
    1.69 +
    1.70 +	aOutput.Append(aInput.Left(outlen));
    1.71 +	for (TInt i=outlen;i<inputLen;i++)
    1.72 +		{
    1.73 +		//All padding bytes must equal the length of padding expected
    1.74 +		if (aInput[i]!=paddingLen)
    1.75 +			{
    1.76 +			User::Leave(KErrInvalidPadding);
    1.77 +			}
    1.78 +		}
    1.79 +	}
    1.80 +
    1.81 +TInt CPaddingPKCS7::MinPaddingLength(void) const
    1.82 +	{
    1.83 +	//if aInputBytes is 1 less than the blocksize then we get 1 byte of padding
    1.84 +	return 1;
    1.85 +	}
    1.86 +
    1.87 +TInt CPaddingPKCS7::MaxPaddedLength(TInt aInputBytes) const
    1.88 +	{
    1.89 +	TUint padBytes = BlockSize() - (aInputBytes % BlockSize());
    1.90 +	return padBytes + aInputBytes;
    1.91 +	}
    1.92 +