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os/security/cryptoservices/certificateandkeymgmt/asn1/oiddec.cpp
author sl@SLION-WIN7.fritz.box
Fri, 15 Jun 2012 03:10:57 +0200
changeset 0 bde4ae8d615e
permissions -rw-r--r--
First public contribution. 
     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 Object ID base class.

    16 *

    17 */

    18 

    19 

    20 #include "asn1dec.h"

    21 

    22 const TInt KMaxOIDLength = 164;

    23 

    24 EXPORT_C TASN1DecObjectIdentifier::TASN1DecObjectIdentifier(void)

    25 	{

    26 	}

    27 

    28 EXPORT_C HBufC* TASN1DecObjectIdentifier::DecodeDERL(const TDesC8& aSource,TInt& aPos)

    29 	{

    30 	TASN1DecGeneric gen(aSource.Right(aSource.Length() - aPos));

    31 	gen.InitL();

    32 	HBufC* res = DecodeDERL(gen);

    33 	aPos+=gen.LengthDER();

    34 	return res;

    35 	}

    36 

    37 EXPORT_C HBufC* TASN1DecObjectIdentifier::DecodeDERL(const TASN1DecGeneric& aSource)

    38 	{

    39 	TFixedArray<TInt, KNumberOfIDs>* oid = new(ELeave) TFixedArray<TInt, KNumberOfIDs>;

    40 	CleanupStack::PushL(oid);

    41 	TInt count = DecodeContentsL(*oid, aSource.GetContentDER());

    42 	HBufC* res = HBufC::NewLC(KMaxOIDLength);

    43 	TPtr pRes = res->Des();

    44 	if (count > 0)

    45 		{

    46 		pRes.AppendNum((*oid)[0]);

    47 		for (TInt i = 1; i < count; i++)

    48 			{

    49 			pRes.Append('.');

    50 			pRes.AppendNum((*oid)[i]);

    51 			}

    52 		}

    53 	CleanupStack::Pop();//res

    54 	CleanupStack::PopAndDestroy();//oid

    55 	return res;

    56 	}

    57 

    58 TInt TASN1DecObjectIdentifier::DecodeContentsL(TFixedArray<TInt, KNumberOfIDs>& aArray, const TDesC8& aSource)

    59 	{

    60 	TInt l = aSource.Length();

    61 	TInt i=0;

    62 	TInt SubID=0;

    63 	TInt SIDn=0;

    64 	if(l < 1)

    65 		{

    66 		User::Leave(KErrArgument);

    67 		}

    68 	SubID+=aSource[i];

    69 	i++;

    70 	if (SubID>=80)

    71 		{

    72 		aArray[SIDn++]=2;

    73 		SubID-=80;

    74 		}

    75 	else

    76 		{

    77 		if (SubID>=40)

    78 			{

    79 			aArray[SIDn++]=1;

    80 			SubID-=40;

    81 			}

    82 		else

    83 			{

    84 			aArray[SIDn++]=0;

    85 			}

    86 		}

    87 	aArray[SIDn++]=SubID;

    88 	for (;i < l;)

    89 		{

    90 		SubID=0;

    91 		while (aSource[i]&0x80)

    92 			{

    93 			// if shifting by 7 does not increase the value its overflowed

    94 			if ( SubID && ((SubID << 7) <= SubID) )

    95 				{

    96 				User::Leave(KErrOverflow);

    97 				}

    98 				

    99 			SubID<<=7;

   100 			SubID+=aSource[i]&0x7f;

   101 			if(i == (l-1))

   102 				{

   103 				User::Leave(KErrArgument);

   104 				}

   105 			i++;

   106 			}

   107 		if ( SubID && ((SubID << 7) <= SubID) )

   108 			{

   109 			User::Leave(KErrOverflow);

   110 			}

   111 		SubID<<=7;

   112 		SubID+=aSource[i];

   113 		

   114 		i++;

   115 		if (SIDn >= KNumberOfIDs) 

   116 			{

   117 			User::Leave(KErrOverflow);

   118 			}

   119 		aArray[SIDn++]=SubID;

   120 		}

   121 	return SIDn;

   122 	}
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