Botan  1.10.9
Public Member Functions | List of all members
Botan::ANSI_X923_Padding Class Reference

#include <mode_pad.h>

Inheritance diagram for Botan::ANSI_X923_Padding:
Botan::BlockCipherModePaddingMethod

Public Member Functions

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

Detailed Description

ANSI X9.23 Padding

Definition at line 84 of file mode_pad.h.

Member Function Documentation

std::string Botan::ANSI_X923_Padding::name ( ) const
inlinevirtual
Returns
name of the mode

Implements Botan::BlockCipherModePaddingMethod.

Definition at line 90 of file mode_pad.h.

Referenced by unpad().

90 { return "X9.23"; }
void Botan::ANSI_X923_Padding::pad ( byte  block[],
size_t  size,
size_t  current_position 
) const
virtual
Parameters
blockoutput buffer
sizeof the block
current_positionin the last block

Implements Botan::BlockCipherModePaddingMethod.

Definition at line 65 of file mode_pad.cpp.

66  {
67  for(size_t j = 0; j != size-position; ++j)
68  block[j] = 0;
69  block[size-position-1] = static_cast<byte>(size-position);
70  }
unsigned char byte
Definition: types.h:22
size_t Botan::BlockCipherModePaddingMethod::pad_bytes ( size_t  block_size,
size_t  position 
) const
virtualinherited
Parameters
block_sizeof the cipher
positionin the current block
Returns
number of padding bytes that will be appended

Reimplemented in Botan::Null_Padding.

Definition at line 17 of file mode_pad.cpp.

18  {
19  return (bs - pos);
20  }
size_t Botan::ANSI_X923_Padding::unpad ( const byte  block[],
size_t  size 
) const
virtual
Parameters
blockthe last block
sizethe of the block

Implements Botan::BlockCipherModePaddingMethod.

Definition at line 75 of file mode_pad.cpp.

References name().

76  {
77  size_t position = block[size-1];
78  if(position > size)
79  throw Decoding_Error(name());
80  for(size_t j = size-position; j != size-1; ++j)
81  if(block[j] != 0)
82  throw Decoding_Error(name());
83  return (size-position);
84  }
std::string name() const
Definition: mode_pad.h:90
bool Botan::ANSI_X923_Padding::valid_blocksize ( size_t  block_size) const
virtual
Parameters
block_sizeof the cipher
Returns
valid block size for this padding mode

Implements Botan::BlockCipherModePaddingMethod.

Definition at line 89 of file mode_pad.cpp.

90  {
91  if(size > 0 && size < 256)
92  return true;
93  else
94  return false;
95  }

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