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os/security/crypto/weakcrypto/source/asymmetric/rsaverifier.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 <asymmetric.h>

    20 #include <asymmetrickeys.h>

    21 #include <bigint.h>

    22 #include <securityerr.h>

    23 #include "rsafunction.h"

    24 

    25 /* CRSAVerifier */

    26 

    27 EXPORT_C CRSAVerifier::CRSAVerifier(void)

    28 	{

    29 	}

    30 

    31 EXPORT_C TBool CRSAVerifier::VerifyL(const TDesC8& aInput, 

    32 	const CRSASignature& aSignature) const

    33 	{

    34 	TBool retval = EFalse;

    35 	HBufC8* inverseSign = InverseSignLC(aSignature);

    36 	

    37 	if (inverseSign->Compare(aInput)==0)

    38 		{

    39 		retval = ETrue;

    40 		}

    41 	CleanupStack::PopAndDestroy(inverseSign);

    42 	return retval;	

    43 	}

    44 

    45 /* CRSAPKCS1v15Verifier */

    46 EXPORT_C CRSAPKCS1v15Verifier* CRSAPKCS1v15Verifier::NewL( 

    47 	const CRSAPublicKey& aKey)

    48 	{

    49 	CRSAPKCS1v15Verifier* self = NewLC(aKey);

    50 	CleanupStack::Pop();

    51 	return self;

    52 	}

    53 

    54 EXPORT_C CRSAPKCS1v15Verifier* CRSAPKCS1v15Verifier::NewLC(

    55 	const CRSAPublicKey& aKey)

    56 	{

    57 	CRSAPKCS1v15Verifier* self = new(ELeave) CRSAPKCS1v15Verifier(aKey);

    58 	CleanupStack::PushL(self);

    59 	self->ConstructL();

    60 	return self;

    61 	}

    62 

    63 TInt CRSAPKCS1v15Verifier::MaxInputLength(void) const

    64 	{

    65 	return MaxOutputLength() - iPadding->MinPaddingLength();	

    66 	}

    67 

    68 TInt CRSAPKCS1v15Verifier::MaxOutputLength(void) const

    69 	{

    70 	return iPublicKey.N().ByteCount();

    71 	}

    72 

    73 HBufC8* CRSAPKCS1v15Verifier::InverseSignLC(

    74 	const CRSASignature& aSignature) const

    75 	{

    76 	HBufC8* unpaddedBuf = HBufC8::NewMaxLC(MaxOutputLength());

    77 	TPtr8 unpaddedHash = unpaddedBuf->Des();

    78 

    79 	RInteger input = RInteger::NewL(aSignature.S());

    80 	CleanupStack::PushL(input);

    81 	RInteger output;

    82 

    83 	RSAFunction::VerifyL(iPublicKey, input, output);

    84 	CleanupStack::PushL(output);

    85 

    86 	TPtrC8 paddedHashPtr = *(output.BufferLC());

    87 	

    88 	iPadding->UnPadL(paddedHashPtr, unpaddedHash);

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

    90 	return unpaddedBuf;

    91 	}

    92 

    93 CRSAPKCS1v15Verifier::CRSAPKCS1v15Verifier(const CRSAPublicKey& aKey)

    94 	: iPublicKey(aKey)

    95 	{

    96 	}

    97 

    98 void CRSAPKCS1v15Verifier::ConstructL(void)

    99 	{

   100 	iPadding = CPaddingPKCS1Signature::NewL(MaxOutputLength());

   101 

   102 	// Check if MaxInputLength() makes sense, if not the key length must 

   103 	// be too small

   104 	if(MaxInputLength() <= 0)

   105 		{

   106 		User::Leave(KErrKeySize);

   107 		}

   108 	}

   109 

   110 CRSAPKCS1v15Verifier::~CRSAPKCS1v15Verifier(void)

   111 	{

   112 	delete iPadding;

   113 	}

   114
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