1 /*

     2 * Copyright (c) 1998-2009 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 * This file contains the implementation of the ASN1 integer class.

    16 * As noted in Notes.txt there are two approaches to the storage of data by

    17 * this class, it can either hold a copy of the data or a pointer to something

    18 * else which holds a copy of the data.

    19 * The object contained within this file encapsulates the ASN1 integer object

    20 * as described in X208 section 14 and the encoding described in X209 section

    21 * 8. 

    22 *

    23 */

    24 

    25 

    26 #include "asn1dec.h"

    27 #include <bigint.h>

    28 

    29 EXPORT_C TASN1DecInteger::TASN1DecInteger()

    30 

    31 	{

    32 	}

    33 

    34 EXPORT_C TInt TASN1DecInteger::DecodeDERShortL(const TDesC8& aSource,TInt& aPos)

    35 	{

    36 	TPtrC8 Source=aSource.Mid(aPos);

    37 	TASN1DecGeneric gen(Source);

    38 	gen.InitL();

    39 	TInt res = DecodeDERShortL(gen);

    40 	aPos+=gen.LengthDER();

    41 	return res;

    42 	}

    43 

    44 EXPORT_C TInt TASN1DecInteger::DecodeDERShortL(const TASN1DecGeneric& aSource)

    45 	{

    46 	TInt res = 0;

    47 	TPtrC8 ptr(aSource.GetContentDER());

    48 	//stop stupid compiler warning

    49 	TUint length = (TUint)(ptr.Length());

    50 	if (length == 0) // DEF055722 

    51 		{

    52 		User::Leave(KErrArgument);

    53 		}

    54 	if (length > sizeof(TInt))

    55 		{

    56 		User::Leave(KErrTooBig);

    57 		}

    58 	TInt8 i;

    59 	if (ptr[0]&128)

    60 		{

    61 		res = -1;

    62 		}

    63 	for (i=0;i<ptr.Length();i++)

    64 		{

    65 		res<<=8;

    66 		res+=ptr[i];

    67 		}

    68 	return res;

    69 	}

    70 

    71 EXPORT_C RInteger TASN1DecInteger::DecodeDERLongL(const TDesC8& aSource,TInt& aPos)

    72 	{

    73 	TPtrC8 Source=aSource.Right(aSource.Length() - aPos);

    74 	TASN1DecGeneric gen(Source);

    75 	gen.InitL();

    76 	RInteger res = DecodeDERLongL(gen);

    77 	aPos+=gen.LengthDER();

    78 	return res;

    79 	}

    80 

    81 EXPORT_C RInteger TASN1DecInteger::DecodeDERLongL(const TASN1DecGeneric& aSource)

    82 	{

    83 	const TDesC8& data = aSource.GetContentDER();

    84 //	JCS 14/03/2003: Changed call to NewL from NewSignedL() because current

    85 //	problem in RInteger for signed code means this sometimes returns incorrect

    86 //	results causing failure in certstore testcode.  However, making this change

    87 //	does cause problems in TASN1 now (posted defect DEF021796).

    88 	RInteger res = RInteger::NewL(data);//aSource.GetContentDER());

    89 	return (res);

    90 	}