|
sl@0
|
1 |
/*
|
|
sl@0
|
2 |
* Copyright (c) 2003-2009 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 |
*
|
|
sl@0
|
16 |
*/
|
|
sl@0
|
17 |
|
|
sl@0
|
18 |
|
|
sl@0
|
19 |
#include <e32base.h>
|
|
sl@0
|
20 |
#include <padding.h>
|
|
sl@0
|
21 |
#include <securityerr.h>
|
|
sl@0
|
22 |
#include <cryptopanic.h>
|
|
sl@0
|
23 |
|
|
sl@0
|
24 |
/* CPaddingPKCS7 */
|
|
sl@0
|
25 |
EXPORT_C CPaddingPKCS7* CPaddingPKCS7::NewL(TInt aBlockBytes)
|
|
sl@0
|
26 |
{
|
|
sl@0
|
27 |
__ASSERT_ALWAYS(aBlockBytes > 0, User::Leave(KErrArgument));
|
|
sl@0
|
28 |
return new(ELeave)CPaddingPKCS7(aBlockBytes);
|
|
sl@0
|
29 |
}
|
|
sl@0
|
30 |
|
|
sl@0
|
31 |
EXPORT_C CPaddingPKCS7* CPaddingPKCS7::NewLC(TInt aBlockBytes)
|
|
sl@0
|
32 |
{
|
|
sl@0
|
33 |
CPaddingPKCS7* self = CPaddingPKCS7::NewL(aBlockBytes);
|
|
sl@0
|
34 |
CleanupStack::PushL(self);
|
|
sl@0
|
35 |
return self;
|
|
sl@0
|
36 |
}
|
|
sl@0
|
37 |
|
|
sl@0
|
38 |
EXPORT_C CPaddingPKCS7::CPaddingPKCS7(TInt aBlockBytes):CPadding(aBlockBytes)
|
|
sl@0
|
39 |
{
|
|
sl@0
|
40 |
}
|
|
sl@0
|
41 |
|
|
sl@0
|
42 |
void CPaddingPKCS7::DoPadL(const TDesC8& aInput,TDes8& aOutput)
|
|
sl@0
|
43 |
{
|
|
sl@0
|
44 |
TInt paddingBytes = BlockSize()-(aInput.Length()%BlockSize());
|
|
sl@0
|
45 |
aOutput.Append(aInput);
|
|
sl@0
|
46 |
aOutput.SetLength(aOutput.Length()+paddingBytes);
|
|
sl@0
|
47 |
for (TInt i=1;i<=paddingBytes;i++)
|
|
sl@0
|
48 |
{
|
|
sl@0
|
49 |
aOutput[aOutput.Length()-i]=(TUint8)(paddingBytes);
|
|
sl@0
|
50 |
}
|
|
sl@0
|
51 |
}
|
|
sl@0
|
52 |
|
|
sl@0
|
53 |
void CPaddingPKCS7::UnPadL(const TDesC8& aInput,TDes8& aOutput)
|
|
sl@0
|
54 |
{
|
|
sl@0
|
55 |
TUint inputLen = aInput.Length();
|
|
sl@0
|
56 |
TUint paddingLen = (TUint)(aInput[inputLen - 1]);
|
|
sl@0
|
57 |
|
|
sl@0
|
58 |
if (paddingLen > inputLen)
|
|
sl@0
|
59 |
{
|
|
sl@0
|
60 |
User::Leave(KErrInvalidPadding);
|
|
sl@0
|
61 |
}
|
|
sl@0
|
62 |
|
|
sl@0
|
63 |
TInt outlen = aInput.Length() - paddingLen;
|
|
sl@0
|
64 |
|
|
sl@0
|
65 |
__ASSERT_DEBUG(aOutput.MaxLength() >= outlen, User::Panic(KCryptoPanic, ECryptoPanicOutputDescriptorOverflow));
|
|
sl@0
|
66 |
|
|
sl@0
|
67 |
aOutput.Append(aInput.Left(outlen));
|
|
sl@0
|
68 |
for (TInt i=outlen;i<inputLen;i++)
|
|
sl@0
|
69 |
{
|
|
sl@0
|
70 |
//All padding bytes must equal the length of padding expected
|
|
sl@0
|
71 |
if (aInput[i]!=paddingLen)
|
|
sl@0
|
72 |
{
|
|
sl@0
|
73 |
User::Leave(KErrInvalidPadding);
|
|
sl@0
|
74 |
}
|
|
sl@0
|
75 |
}
|
|
sl@0
|
76 |
}
|
|
sl@0
|
77 |
|
|
sl@0
|
78 |
TInt CPaddingPKCS7::MinPaddingLength(void) const
|
|
sl@0
|
79 |
{
|
|
sl@0
|
80 |
//if aInputBytes is 1 less than the blocksize then we get 1 byte of padding
|
|
sl@0
|
81 |
return 1;
|
|
sl@0
|
82 |
}
|
|
sl@0
|
83 |
|
|
sl@0
|
84 |
TInt CPaddingPKCS7::MaxPaddedLength(TInt aInputBytes) const
|
|
sl@0
|
85 |
{
|
|
sl@0
|
86 |
TUint padBytes = BlockSize() - (aInputBytes % BlockSize());
|
|
sl@0
|
87 |
return padBytes + aInputBytes;
|
|
sl@0
|
88 |
}
|
|
sl@0
|
89 |
|