|
sl@0
|
1 |
/*
|
|
sl@0
|
2 |
* Copyright (c) 2002-2009 Nokia Corporation and/or its subsidiary(-ies).
|
|
sl@0
|
3 |
* All rights reserved.
|
|
sl@0
|
4 |
* This component and the accompanying materials are made available
|
|
sl@0
|
5 |
* under the terms of the License "Eclipse Public License v1.0"
|
|
sl@0
|
6 |
* which accompanies this distribution, and is available
|
|
sl@0
|
7 |
* at the URL "http://www.eclipse.org/legal/epl-v10.html".
|
|
sl@0
|
8 |
*
|
|
sl@0
|
9 |
* Initial Contributors:
|
|
sl@0
|
10 |
* Nokia Corporation - initial contribution.
|
|
sl@0
|
11 |
*
|
|
sl@0
|
12 |
* Contributors:
|
|
sl@0
|
13 |
*
|
|
sl@0
|
14 |
* Description:
|
|
sl@0
|
15 |
* This file contains the implementation for class encoding bit strings in ASN1 DER.
|
|
sl@0
|
16 |
*
|
|
sl@0
|
17 |
*/
|
|
sl@0
|
18 |
|
|
sl@0
|
19 |
|
|
sl@0
|
20 |
/**
|
|
sl@0
|
21 |
@file
|
|
sl@0
|
22 |
*/
|
|
sl@0
|
23 |
|
|
sl@0
|
24 |
#include <asn1enc.h>
|
|
sl@0
|
25 |
|
|
sl@0
|
26 |
EXPORT_C CASN1EncBitString* CASN1EncBitString::NewLC(const TDesC8& aBitStr)
|
|
sl@0
|
27 |
{
|
|
sl@0
|
28 |
CASN1EncBitString* self = new (ELeave) CASN1EncBitString();
|
|
sl@0
|
29 |
CleanupStack::PushL(self);
|
|
sl@0
|
30 |
self->ConstructL(aBitStr);
|
|
sl@0
|
31 |
return self;
|
|
sl@0
|
32 |
}
|
|
sl@0
|
33 |
|
|
sl@0
|
34 |
EXPORT_C CASN1EncBitString* CASN1EncBitString::NewL(const TDesC8& aBitStr)
|
|
sl@0
|
35 |
{
|
|
sl@0
|
36 |
CASN1EncBitString* self = NewLC(aBitStr);
|
|
sl@0
|
37 |
CleanupStack::Pop(self);
|
|
sl@0
|
38 |
return self;
|
|
sl@0
|
39 |
}
|
|
sl@0
|
40 |
|
|
sl@0
|
41 |
EXPORT_C CASN1EncBitString* CASN1EncBitString::NewLC(const TDesC8& aBitStr,
|
|
sl@0
|
42 |
TUint aLengthBits)
|
|
sl@0
|
43 |
{
|
|
sl@0
|
44 |
CASN1EncBitString* self = new (ELeave) CASN1EncBitString();
|
|
sl@0
|
45 |
CleanupStack::PushL(self);
|
|
sl@0
|
46 |
self->ConstructL(aBitStr, aLengthBits);
|
|
sl@0
|
47 |
return self;
|
|
sl@0
|
48 |
}
|
|
sl@0
|
49 |
|
|
sl@0
|
50 |
EXPORT_C CASN1EncBitString* CASN1EncBitString::NewL(const TDesC8& aBitStr,
|
|
sl@0
|
51 |
TUint aLengthBits)
|
|
sl@0
|
52 |
{
|
|
sl@0
|
53 |
CASN1EncBitString* self = NewLC(aBitStr, aLengthBits);
|
|
sl@0
|
54 |
CleanupStack::Pop(self);
|
|
sl@0
|
55 |
return self;
|
|
sl@0
|
56 |
}
|
|
sl@0
|
57 |
|
|
sl@0
|
58 |
EXPORT_C CASN1EncBitString* CASN1EncBitString::NewL(const CASN1EncBase& aEncObj)
|
|
sl@0
|
59 |
{
|
|
sl@0
|
60 |
CASN1EncBitString* self = NewLC(aEncObj);
|
|
sl@0
|
61 |
CleanupStack::Pop(self);
|
|
sl@0
|
62 |
return self;
|
|
sl@0
|
63 |
}
|
|
sl@0
|
64 |
|
|
sl@0
|
65 |
EXPORT_C CASN1EncBitString* CASN1EncBitString::NewLC(const CASN1EncBase& aEncObj)
|
|
sl@0
|
66 |
{
|
|
sl@0
|
67 |
CASN1EncBitString* self = new (ELeave) CASN1EncBitString();
|
|
sl@0
|
68 |
CleanupStack::PushL(self);
|
|
sl@0
|
69 |
self->ConstructL(aEncObj);
|
|
sl@0
|
70 |
return self;
|
|
sl@0
|
71 |
}
|
|
sl@0
|
72 |
|
|
sl@0
|
73 |
EXPORT_C CASN1EncBitString::~CASN1EncBitString()
|
|
sl@0
|
74 |
{
|
|
sl@0
|
75 |
delete iContents;
|
|
sl@0
|
76 |
}
|
|
sl@0
|
77 |
|
|
sl@0
|
78 |
CASN1EncBitString::CASN1EncBitString()
|
|
sl@0
|
79 |
: CASN1EncPrimitive(EASN1BitString),
|
|
sl@0
|
80 |
iPadding(0)
|
|
sl@0
|
81 |
{
|
|
sl@0
|
82 |
}
|
|
sl@0
|
83 |
|
|
sl@0
|
84 |
void CASN1EncBitString::ConstructL(const TDesC8& aBitStr)
|
|
sl@0
|
85 |
{
|
|
sl@0
|
86 |
iContents = aBitStr.AllocL();
|
|
sl@0
|
87 |
CASN1EncPrimitive::ConstructL();
|
|
sl@0
|
88 |
}
|
|
sl@0
|
89 |
|
|
sl@0
|
90 |
void CASN1EncBitString::ConstructL(const TDesC8& aBitStr, TUint aLengthBits)
|
|
sl@0
|
91 |
{
|
|
sl@0
|
92 |
iContents = aBitStr.AllocL();
|
|
sl@0
|
93 |
CASN1EncPrimitive::ConstructL();
|
|
sl@0
|
94 |
TUint totalBits = aBitStr.Length() * 8;
|
|
sl@0
|
95 |
__ASSERT_ALWAYS(aLengthBits <= totalBits, User::Leave(KErrArgument));
|
|
sl@0
|
96 |
iPadding = (TUint8)(totalBits - aLengthBits);
|
|
sl@0
|
97 |
if(iPadding > 7)
|
|
sl@0
|
98 |
User::Leave(KErrArgument);
|
|
sl@0
|
99 |
}
|
|
sl@0
|
100 |
|
|
sl@0
|
101 |
/**
|
|
sl@0
|
102 |
* @internalTechnology
|
|
sl@0
|
103 |
* Constructs bit string from ASN.1 encoding object.
|
|
sl@0
|
104 |
* @param aEncObj ASN.1 encoding object to wrap in bit string.
|
|
sl@0
|
105 |
* @note First produces raw DER encoding from the object, then creates
|
|
sl@0
|
106 |
* a bit string using other construct function.
|
|
sl@0
|
107 |
*/
|
|
sl@0
|
108 |
void CASN1EncBitString::ConstructL(const CASN1EncBase& aEncObj)
|
|
sl@0
|
109 |
{
|
|
sl@0
|
110 |
// produce raw DER encoding from the created ASN.1 encoding
|
|
sl@0
|
111 |
TUint len = aEncObj.LengthDER();
|
|
sl@0
|
112 |
HBufC8* intDer = HBufC8::NewMaxLC(len);
|
|
sl@0
|
113 |
TPtr8 ptrDer = intDer->Des();
|
|
sl@0
|
114 |
TUint pos = 0;
|
|
sl@0
|
115 |
aEncObj.WriteDERL(ptrDer, pos);
|
|
sl@0
|
116 |
// wrap the produced DER encoding into a bit string
|
|
sl@0
|
117 |
ConstructL(*intDer);
|
|
sl@0
|
118 |
// cleanup
|
|
sl@0
|
119 |
CleanupStack::PopAndDestroy(intDer);
|
|
sl@0
|
120 |
}
|
|
sl@0
|
121 |
|
|
sl@0
|
122 |
/**
|
|
sl@0
|
123 |
* @internalTechnology
|
|
sl@0
|
124 |
* Calculates length of DER-encoded bit string contents. For non empty
|
|
sl@0
|
125 |
* bit strings this differs from octet string in the extra leading byte
|
|
sl@0
|
126 |
* containing the number of unused bits in the last octet.
|
|
sl@0
|
127 |
*/
|
|
sl@0
|
128 |
void CASN1EncBitString::CalculateContentsLengthDER()
|
|
sl@0
|
129 |
{
|
|
sl@0
|
130 |
iContentsLengthDER = iContents->Length();
|
|
sl@0
|
131 |
if (iContentsLengthDER > 0)
|
|
sl@0
|
132 |
{
|
|
sl@0
|
133 |
iContentsLengthDER++;
|
|
sl@0
|
134 |
}
|
|
sl@0
|
135 |
}
|
|
sl@0
|
136 |
|
|
sl@0
|
137 |
/**
|
|
sl@0
|
138 |
* @internalTechnology
|
|
sl@0
|
139 |
* Writes DER-encoded bit string contents to aBuf. Prepends
|
|
sl@0
|
140 |
* the actual bit string octets with extra octet containing
|
|
sl@0
|
141 |
* number of unused bits in the last octet. Before writing,
|
|
sl@0
|
142 |
* converts contents of the bit string to big-endian form.
|
|
sl@0
|
143 |
* @param aBuf Buffer to write to; must be long enough;
|
|
sl@0
|
144 |
* see #CalculateContentsLengthDER method.
|
|
sl@0
|
145 |
*/
|
|
sl@0
|
146 |
void CASN1EncBitString::WriteContentsDERL(TDes8& aBuf) const
|
|
sl@0
|
147 |
{
|
|
sl@0
|
148 |
if (iContents->Length() > 0)
|
|
sl@0
|
149 |
{
|
|
sl@0
|
150 |
aBuf[0] = iPadding;
|
|
sl@0
|
151 |
TUint len = iContents->Length();
|
|
sl@0
|
152 |
// We do not need to swap bits, as it is already done.
|
|
sl@0
|
153 |
aBuf.Replace(1, len, *iContents);
|
|
sl@0
|
154 |
}
|
|
sl@0
|
155 |
else
|
|
sl@0
|
156 |
{
|
|
sl@0
|
157 |
// no padding octet for the empty bit string
|
|
sl@0
|
158 |
aBuf.SetLength(0);
|
|
sl@0
|
159 |
}
|
|
sl@0
|
160 |
}
|