Botan::BlockCipherModePaddingMethod Class Reference

#include <mode_pad.h>

Inheritance diagram for Botan::BlockCipherModePaddingMethod:

List of all members.

Public Member Functions
virtual std::string	name () const =0
virtual void	pad (byte block[], u32bit size, u32bit current_position) const =0
virtual u32bit	pad_bytes (u32bit block_size, u32bit position) const
virtual u32bit	unpad (const byte block[], u32bit size) const =0
virtual bool	valid_blocksize (u32bit block_size) const =0
virtual	~BlockCipherModePaddingMethod ()

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Detailed Description

Block Cipher Mode Padding Method This class is pretty limited, it cannot deal well with randomized padding methods, or any padding method that wants to add more than one block. For instance, it should be possible to define cipher text stealing mode as simply a padding mode for CBC, which happens to consume the last two block (and requires use of the block cipher).

Definition at line 25 of file mode_pad.h.

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Constructor & Destructor Documentation

virtual Botan::BlockCipherModePaddingMethod::~BlockCipherModePaddingMethod

(

)

[inline, virtual]

virtual destructor

Definition at line 66 of file mode_pad.h.

{}

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Member Function Documentation

virtual std::string Botan::BlockCipherModePaddingMethod::name

(

)

const [pure virtual]

Returns:

name of the mode

Implemented in Botan::PKCS7_Padding, Botan::ANSI_X923_Padding, Botan::OneAndZeros_Padding, and Botan::Null_Padding.

Referenced by Botan::CBC_Decryption::CBC_Decryption(), Botan::CBC_Encryption::CBC_Encryption(), Botan::ECB_Decryption::name(), Botan::ECB_Encryption::name(), Botan::CBC_Decryption::name(), and Botan::CBC_Encryption::name().

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

Parameters:

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

Implemented in Botan::PKCS7_Padding, Botan::ANSI_X923_Padding, Botan::OneAndZeros_Padding, and Botan::Null_Padding.

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

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);
   }

virtual u32bit Botan::BlockCipherModePaddingMethod::unpad	(	const byte	block[],
		u32bit	size
	)			const [pure virtual]

Parameters:

	block	the last block
	size	the of the block

Implemented in Botan::PKCS7_Padding, Botan::ANSI_X923_Padding, Botan::OneAndZeros_Padding, and Botan::Null_Padding.

virtual bool Botan::BlockCipherModePaddingMethod::valid_blocksize

(

u32bit

block_size

)

const [pure virtual]

Parameters:

block_size

of the cipher

Returns:

valid block size for this padding mode

Implemented in Botan::PKCS7_Padding, Botan::ANSI_X923_Padding, Botan::OneAndZeros_Padding, and Botan::Null_Padding.

Referenced by Botan::CBC_Decryption::CBC_Decryption(), and Botan::CBC_Encryption::CBC_Encryption().

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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