Botan::PKCS7_Padding Class Reference

#include <mode_pad.h>

Inheritance diagram for Botan::PKCS7_Padding:

List of all members.

Public Member Functions
void	add_padding (secure_vector< byte > &buffer, size_t final_block_bytes, size_t block_size) const override
std::string	name () const
size_t	unpad (const byte[], size_t) const
bool	valid_blocksize (size_t bs) const

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Detailed Description

PKCS#7 Padding

Definition at line 59 of file mode_pad.h.

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Member Function Documentation

void Botan::PKCS7_Padding::add_padding	(	secure_vector< byte > &	buffer,
		size_t	final_block_bytes,
		size_t	block_size
	)		const [override, virtual]

Implements Botan::BlockCipherModePaddingMethod.

Definition at line 36 of file mode_pad.cpp.

   {
   const byte pad_value = block_size - last_byte_pos;

   for(size_t i = 0; i != pad_value; ++i)
      buffer.push_back(pad_value);
   }

std::string Botan::PKCS7_Padding::name

(

)

const [inline, virtual]

Returns:

name of the mode

Implements Botan::BlockCipherModePaddingMethod.

Definition at line 70 of file mode_pad.h.

Referenced by unpad().

{ return "PKCS7"; }

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

Parameters:

block	the last block
size	the of the block

Implements Botan::BlockCipherModePaddingMethod.

Definition at line 49 of file mode_pad.cpp.

References name().

   {
   size_t position = block[size-1];

   if(position > size)
      throw Decoding_Error("Bad padding in " + name());

   for(size_t j = size-position; j != size-1; ++j)
      if(block[j] != position)
         throw Decoding_Error("Bad padding in " + name());

   return (size-position);
   }

bool Botan::PKCS7_Padding::valid_blocksize

(

size_t

block_size

)

const [inline, virtual]

Parameters:

block_size

of the cipher

Returns:

valid block size for this padding mode

Implements Botan::BlockCipherModePaddingMethod.

Definition at line 68 of file mode_pad.h.

{ return (bs > 0 && bs < 256); }

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

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