CPaddingPKCS7 Class Reference

#include <padding.h>

class CPaddingPKCS7 : public CPadding

Inherits from

CPaddingPKCS7
- CPadding
  - CBase

Public Member Functions
virtual TInt	MaxPaddedLength(TInt)
virtual TInt	MinPaddingLength(void)
IMPORT_C CPaddingPKCS7 *	NewL(TInt)
IMPORT_C CPaddingPKCS7 *	NewLC(TInt)
virtual void	UnPadL(const TDesC8 &, TDes8 &)

Protected Member Functions
	CPaddingPKCS7(TInt)

Inherited Functions
	CBase::CBase()
	CBase::Delete(CBase *)
	CBase::Extension_(TUint,TAny &,TAny )
	CBase::operator new(TUint)
	CBase::operator new(TUint,TAny *)
	CBase::operator new(TUint,TLeave)
	CBase::operator new(TUint,TLeave,TUint)
	CBase::operator new(TUint,TUint)
	CBase::~CBase()
	CPadding::BlockSize(void)const
	CPadding::CPadding(TInt)
	CPadding::GetExtension(TUint,TAny &,TAny )
	CPadding::MaxUnPaddedLength(TInt)const
	CPadding::PadL(const TDesC8 &,TDes8 &)
	CPadding::SetBlockSize(TInt)

Detailed Description

This concrete subclass of CPadding implements padding according to the PKCS#7/TLS standard.

Constructor & Destructor Documentation

CPaddingPKCS7 ( TInt )

IMPORT_C

CPaddingPKCS7

(

TInt

aBlockBytes

)

[protected]

Constructor

Parameters
aBlockBytes	The block size in bytes.

Member Function Documentation

MaxPaddedLength ( TInt )

TInt

MaxPaddedLength

(

TInt

aInputBytes

)

const [virtual]

Reimplemented from CPadding::MaxPaddedLength(TInt)const

Gets the size of the aOutput buffer, in a call to PadL(), must be in order to accommodate a block size of BlockSize() and an input size of aInputBytes.

Note:

By default, this function returns the output of BlockSize(). If a derived padding system outputs more than a single block of padding, one must override this function and return the appropriate value.

Parameters
aInputBytes	The amount of data to be padded out in bytes.

Return Value: A TInt representing the maximum amount of padded output data (in bytes) for a given block and input size.

MinPaddingLength ( void )

TInt

MinPaddingLength

(

void

)

const [virtual]

Reimplemented from CPadding::MinPaddingLength(void)const

Gets the smallest number of bytes that PadL() will ever add to aInput in order to get a valid block aligned aOutput.

For example, in SSLv3 padding, if the block size is 8 and aInput is 7 bytes, it will append 1 byte of padding. For SSLv3 padding, this is the smallest amount possible as an 8 byte input will add another block size (8 more bytes) of padded data.

Return Value: A TInt containing the smallest number of padding bytes possible.

NewL ( TInt )

IMPORT_C CPaddingPKCS7 *

NewL

(

TInt

aBlockBytes

)

[static]

Creates a new CPaddingPKCS7 object.

Parameters
aBlockBytes	The block size in bytes.

Return Value: A pointer to the new CPaddingPKCS7 object.

NewLC ( TInt )

IMPORT_C CPaddingPKCS7 *

NewLC

(

TInt

aBlockBytes

)

[static]

Creates a new CPaddingPKCS7 object and leaves a pointer to it on the cleanup stack.

Parameters
aBlockBytes	The block size in bytes.

Return Value: A pointer to the new CPaddingPKCS7 object.

UnPadL ( const TDesC8 &, TDes8 & )

void	UnPadL	(	const TDesC8 &	aInput,
			TDes8 &	aOutput
		)	[virtual]

Reimplemented from CPadding::UnPadL(const TDesC8 &,TDes8 &)

Removes padding from aInput and appends unpadded result to aOutput.

Parameters
aInput	Data to be unpadded.
aOutput	On return, the unpadded data.