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

#include <mode_pad.h>

Inheritance diagram for Botan::OneAndZeros_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

One And Zeros Padding

Definition at line 96 of file mode_pad.h.

Member Function Documentation

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

Implements Botan::BlockCipherModePaddingMethod.

Definition at line 102 of file mode_pad.h.

Referenced by unpad().

102 { return "OneAndZeros"; }
void Botan::OneAndZeros_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 100 of file mode_pad.cpp.

101  {
102  block[0] = 0x80;
103  for(size_t j = 1; j != size; ++j)
104  block[j] = 0x00;
105  }
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::OneAndZeros_Padding::unpad ( const byte  block[],
size_t  size 
) const
virtual
Parameters
blockthe last block
sizethe of the block

Implements Botan::BlockCipherModePaddingMethod.

Definition at line 110 of file mode_pad.cpp.

References name().

111  {
112  while(size)
113  {
114  if(block[size-1] == 0x80)
115  break;
116  if(block[size-1] != 0x00)
117  throw Decoding_Error(name());
118  size--;
119  }
120  if(!size)
121  throw Decoding_Error(name());
122  return (size-1);
123  }
std::string name() const
Definition: mode_pad.h:102
bool Botan::OneAndZeros_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 128 of file mode_pad.cpp.

129  {
130  return (size > 0);
131  }

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