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os/security/crypto/weakcryptospi/source/padding/pkcs7.cpp
author sl
Tue, 10 Jun 2014 14:32:02 +0200
changeset 1 260cb5ec6c19
permissions -rw-r--r--
Update contrib. 
     1 /*

     2 * Copyright (c) 2003-2009 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 */

    17 

    18 

    19 #include <e32base.h>

    20 #include <padding.h>

    21 #include <securityerr.h>

    22 #include <cryptopanic.h>

    23 

    24 #include "paddingshim.h"

    25 

    26 /* CPaddingPKCS7 */

    27 EXPORT_C CPaddingPKCS7* CPaddingPKCS7::NewL(TInt aBlockBytes)

    28 	{

    29 	__ASSERT_ALWAYS(aBlockBytes > 0, User::Leave(KErrArgument));

    30 	return CPaddingPKCS7Shim::NewL(aBlockBytes);

    31 	}

    32 

    33 EXPORT_C CPaddingPKCS7* CPaddingPKCS7::NewLC(TInt aBlockBytes)

    34 	{

    35 	CPaddingPKCS7* self = CPaddingPKCS7::NewL(aBlockBytes);

    36 	CleanupStack::PushL(self);

    37 	return self;

    38 	}

    39 

    40 EXPORT_C CPaddingPKCS7::CPaddingPKCS7(TInt aBlockBytes):CPadding(aBlockBytes)

    41 	{

    42 	}

    43 

    44 void CPaddingPKCS7::DoPadL(const TDesC8& aInput,TDes8& aOutput)

    45 	{

    46 	TInt paddingBytes = BlockSize()-(aInput.Length()%BlockSize());		

    47 	aOutput.Append(aInput);

    48 	aOutput.SetLength(aOutput.Length()+paddingBytes);

    49 	for (TInt i=1;i<=paddingBytes;i++)

    50 		{

    51 		aOutput[aOutput.Length()-i]=(TUint8)(paddingBytes);

    52 		}

    53 	}

    54 

    55 void CPaddingPKCS7::UnPadL(const TDesC8& aInput,TDes8& aOutput)

    56 	{

    57 	TUint inputLen = aInput.Length();

    58  	TUint paddingLen = (TUint)(aInput[inputLen - 1]);

    59 

    60 	if (paddingLen > inputLen)

    61  		{

    62  		User::Leave(KErrInvalidPadding);

    63  		}

    64    

    65 	TInt outlen = aInput.Length() - paddingLen;

    66 

    67 	__ASSERT_DEBUG(aOutput.MaxLength() >= outlen, User::Panic(KCryptoPanic, ECryptoPanicOutputDescriptorOverflow));

    68 

    69 	aOutput.Append(aInput.Left(outlen));

    70 	for (TInt i=outlen;i<inputLen;i++)

    71 		{

    72 		//All padding bytes must equal the length of padding expected

    73 		if (aInput[i]!=paddingLen)

    74 			{

    75 			User::Leave(KErrInvalidPadding);

    76 			}

    77 		}

    78 	}

    79 

    80 TInt CPaddingPKCS7::MinPaddingLength(void) const

    81 	{

    82 	//if aInputBytes is 1 less than the blocksize then we get 1 byte of padding

    83 	return 1;

    84 	}

    85 

    86 TInt CPaddingPKCS7::MaxPaddedLength(TInt aInputBytes) const

    87 	{

    88 	TUint padBytes = BlockSize() - (aInputBytes % BlockSize());

    89 	return padBytes + aInputBytes;

    90 	}

    91
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