Botan::PKCS7_Padding Class Reference

#include <mode_pad.h>

Inheritance diagram for Botan::PKCS7_Padding:

List of all members.

Public Member Functions
std::string	name () const
void	pad (byte[], u32bit, u32bit) const
virtual u32bit	pad_bytes (u32bit block_size, u32bit position) const
u32bit	unpad (const byte[], u32bit) const
bool	valid_blocksize (u32bit) const

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Detailed Description

PKCS#7 Padding

Definition at line 72 of file mode_pad.h.

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Member Function Documentation

std::string Botan::PKCS7_Padding::name

(

)

const [inline, virtual]

Returns:

name of the mode

Implements Botan::BlockCipherModePaddingMethod.

Definition at line 78 of file mode_pad.h.

Referenced by unpad().

{ return "PKCS7"; }

void Botan::PKCS7_Padding::pad	(	byte	block[],
		u32bit	size,
		u32bit	current_position
	)			const [virtual]

Parameters:

	block	output buffer
	size	of the block
	current_position	in the last block

Implements Botan::BlockCipherModePaddingMethod.

Definition at line 24 of file mode_pad.cpp.

   {
   for(u32bit j = 0; j != size; ++j)
      block[j] = (size-position);
   }

u32bit Botan::BlockCipherModePaddingMethod::pad_bytes	(	u32bit	block_size,
		u32bit	position
	)			const [virtual, inherited]

Parameters:

	block_size	of the cipher
	position	in the current block

Returns:

number of padding bytes that will be appended

Reimplemented in Botan::Null_Padding.

Definition at line 16 of file mode_pad.cpp.

   {
   return (bs - pos);
   }

u32bit Botan::PKCS7_Padding::unpad	(	const	block[],
		u32bit	size
	)			const [virtual]

Parameters:

	block	the last block
	size	the of the block

Implements Botan::BlockCipherModePaddingMethod.

Definition at line 33 of file mode_pad.cpp.

References name().

   {
   u32bit position = block[size-1];
   if(position > size)
      throw Decoding_Error(name());
   for(u32bit j = size-position; j != size-1; ++j)
      if(block[j] != position)
         throw Decoding_Error(name());
   return (size-position);
   }

bool Botan::PKCS7_Padding::valid_blocksize

(

u32bit

block_size

)

const [virtual]

Parameters:

block_size

of the cipher

Returns:

valid block size for this padding mode

Implements Botan::BlockCipherModePaddingMethod.

Definition at line 47 of file mode_pad.cpp.

   {
   if(size > 0 && size < 256)
      return true;
   else
      return false;
   }

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The documentation for this class was generated from the following files:

• src/filters/modes/mode_pad/mode_pad.h
• src/filters/modes/mode_pad/mode_pad.cpp