Botan::CFB_Decryption Class Reference

#include <cfb.h>

Inheritance diagram for Botan::CFB_Decryption:

Public Member Functions
virtual bool	attachable ()
	CFB_Decryption (BlockCipher *cipher, size_t feedback=0)
	CFB_Decryption (BlockCipher *cipher, const SymmetricKey &key, const InitializationVector &iv, size_t feedback=0)
virtual void	end_msg ()
Key_Length_Specification	key_spec () const override
std::string	name () const
void	set_iv (const InitializationVector &)
void	set_key (const SymmetricKey &key)
virtual void	start_msg ()
bool	valid_iv_length (size_t iv_len) const
bool	valid_keylength (size_t length) const
	~CFB_Decryption ()

Protected Member Functions
virtual void	send (const byte in[], size_t length)
void	send (byte in)
void	send (const secure_vector< byte > &in)
void	send (const std::vector< byte > &in)
void	send (const secure_vector< byte > &in, size_t length)
void	send (const std::vector< byte > &in, size_t length)

Detailed Description

CFB Decryption

Definition at line 52 of file cfb.h.

Constructor & Destructor Documentation

Botan::CFB_Decryption::CFB_Decryption	(	BlockCipher *	cipher,
		size_t	feedback = 0
	)

Definition at line 98 of file cfb.cpp.

References Botan::BlockCipher::block_size(), and Botan::ASN1::to_string().

   {
   cipher = ciph;
   feedback = fback_bits ? fback_bits / 8: cipher->block_size();

   buffer.resize(cipher->block_size());
   state.resize(cipher->block_size());
   position = 0;

   if(feedback == 0 || fback_bits % 8 != 0 || feedback > cipher->block_size())
      throw Invalid_Argument("CFB_Decryption: Invalid feedback size " +
                             std::to_string(fback_bits));
   }

Botan::CFB_Decryption::CFB_Decryption	(	BlockCipher *	cipher,
		const SymmetricKey &	key,
		const InitializationVector &	iv,
		size_t	feedback = 0
	)

Definition at line 115 of file cfb.cpp.

References Botan::BlockCipher::block_size(), set_iv(), set_key(), and Botan::ASN1::to_string().

   {
   cipher = ciph;
   feedback = fback_bits ? fback_bits / 8: cipher->block_size();

   buffer.resize(cipher->block_size());
   state.resize(cipher->block_size());
   position = 0;

   if(feedback == 0 || fback_bits % 8 != 0 || feedback > cipher->block_size())
      throw Invalid_Argument("CFB_Decryption: Invalid feedback size " +
                             std::to_string(fback_bits));

   set_key(key);
   set_iv(iv);
   }

Botan::CFB_Decryption::~CFB_Decryption ( )

inline

Definition at line 73 of file cfb.h.

{ delete cipher; }

Member Function Documentation

virtual bool Botan::Filter::attachable ( )

inlinevirtualinherited

Check whether this filter is an attachable filter.

Returns

true if this filter is attachable, false otherwise

Reimplemented in Botan::SecureQueue, and Botan::DataSink.

Definition at line 52 of file filter.h.

{ return true; }

virtual void Botan::Filter::end_msg ( )

inlinevirtualinherited

Notify that the current message is finished; flush buffers and do end-of-message processing (if any).

Reimplemented in Botan::MAC_Filter, Botan::Hash_Filter, Botan::PK_Verifier_Filter, Botan::Base64_Decoder, Botan::Hex_Decoder, Botan::Zlib_Decompression, Botan::Lzma_Decompression, Botan::PK_Signer_Filter, Botan::Bzip_Decompression, Botan::PK_Decryptor_Filter, Botan::Base64_Encoder, Botan::PBE_PKCS5v15, Botan::PBE_PKCS5v20, Botan::Hex_Encoder, Botan::Lzma_Compression, Botan::Bzip_Compression, Botan::Zlib_Compression, and Botan::PK_Encryptor_Filter.

Definition at line 46 of file filter.h.

{}

Key_Length_Specification Botan::CFB_Decryption::key_spec ( ) const

inlineoverridevirtual

Returns

object describing limits on key size

Implements Botan::Keyed_Filter.

Definition at line 61 of file cfb.h.

{ return cipher->key_spec(); }

std::string Botan::CFB_Decryption::name ( ) const

inlinevirtual

Returns

descriptive name for this filter

Implements Botan::Filter.

Definition at line 55 of file cfb.h.

Referenced by set_iv().

{ return cipher->name() + "/CFB"; }

void Botan::Filter::send ( const byte  in[], size_t  length  )

protectedvirtualinherited

Parameters

in	some input for the filter
length	the length of in

Reimplemented in Botan::Threaded_Fork.

Definition at line 28 of file filter.cpp.

References Botan::Filter::write().

Referenced by Botan::PK_Encryptor_Filter::end_msg(), Botan::Zlib_Compression::end_msg(), Botan::Bzip_Compression::end_msg(), Botan::Lzma_Compression::end_msg(), Botan::Hex_Encoder::end_msg(), Botan::Base64_Encoder::end_msg(), Botan::PK_Decryptor_Filter::end_msg(), Botan::Bzip_Decompression::end_msg(), Botan::PK_Signer_Filter::end_msg(), Botan::Lzma_Decompression::end_msg(), Botan::Zlib_Decompression::end_msg(), Botan::Hex_Decoder::end_msg(), Botan::Base64_Decoder::end_msg(), Botan::PK_Verifier_Filter::end_msg(), Botan::Hash_Filter::end_msg(), Botan::MAC_Filter::end_msg(), Botan::Bzip_Compression::flush(), Botan::Zlib_Compression::flush(), Botan::Lzma_Compression::flush(), Botan::Bzip_Compression::write(), Botan::Zlib_Compression::write(), Botan::Lzma_Compression::write(), Botan::StreamCipher_Filter::write(), Botan::Bzip_Decompression::write(), Botan::Lzma_Decompression::write(), Botan::Zlib_Decompression::write(), Botan::Hex_Decoder::write(), and Botan::Base64_Decoder::write().

   {
   bool nothing_attached = true;
   for(size_t j = 0; j != total_ports(); ++j)
      if(next[j])
         {
         if(write_queue.size())
            next[j]->write(&write_queue[0], write_queue.size());
         next[j]->write(input, length);
         nothing_attached = false;
         }

   if(nothing_attached)
      write_queue += std::make_pair(input, length);
   else
      write_queue.clear();
   }

void Botan::Filter::send ( byte  in )

inlineprotectedinherited

Parameters

in	some input for the filter

Definition at line 65 of file filter.h.

References Botan::Filter::send().

Referenced by Botan::Filter::send().

{ send(&in, 1); }

void Botan::Filter::send ( const secure_vector< byte > &  in )

inlineprotectedinherited

Parameters

in	some input for the filter

Definition at line 70 of file filter.h.

References Botan::Filter::send().

Referenced by Botan::Filter::send().

{ send(&in[0], in.size()); }

void Botan::Filter::send ( const std::vector< byte > &  in )

inlineprotectedinherited

Parameters

in	some input for the filter

Definition at line 75 of file filter.h.

References Botan::Filter::send().

Referenced by Botan::Filter::send().

{ send(&in[0], in.size()); }

void Botan::Filter::send ( const secure_vector< byte > &  in, size_t  length  )

inlineprotectedinherited

Parameters

in	some input for the filter
length	the number of bytes of in to send

Definition at line 81 of file filter.h.

         {
         send(&in[0], length);
         }

void Botan::Filter::send ( const std::vector< byte > &  in, size_t  length  )

inlineprotectedinherited

Parameters

in	some input for the filter
length	the number of bytes of in to send

Definition at line 90 of file filter.h.

         {
         send(&in[0], length);
         }

void Botan::CFB_Decryption::set_iv ( const InitializationVector &  iv )

virtual

Set the initialization vector of this filter. Note: you should call set_iv() only after you have called set_key()

Parameters

iv	the initialization vector to use

Reimplemented from Botan::Keyed_Filter.

Definition at line 135 of file cfb.cpp.

References Botan::OctetString::bits_of(), Botan::BlockCipher::encrypt(), Botan::OctetString::length(), name(), valid_iv_length(), and Botan::zeroise().

Referenced by CFB_Decryption().

   {
   if(!valid_iv_length(iv.length()))
      throw Invalid_IV_Length(name(), iv.length());

   state = iv.bits_of();
   zeroise(buffer);
   position = 0;

   cipher->encrypt(state, buffer);
   }

void Botan::CFB_Decryption::set_key ( const SymmetricKey &  key )

inlinevirtual

Set the key of this filter

Parameters

key	the key to use

Implements Botan::Keyed_Filter.

Definition at line 59 of file cfb.h.

Referenced by CFB_Decryption().

{ cipher->set_key(key); }

virtual void Botan::Filter::start_msg ( )

inlinevirtualinherited

Start a new message. Must be closed by end_msg() before another message can be started.

Reimplemented in Botan::Zlib_Decompression, Botan::Lzma_Decompression, Botan::Bzip_Decompression, Botan::PBE_PKCS5v15, Botan::PBE_PKCS5v20, Botan::Lzma_Compression, Botan::Bzip_Compression, and Botan::Zlib_Compression.

Definition at line 40 of file filter.h.

{}

bool Botan::CFB_Decryption::valid_iv_length ( size_t  length ) const

inlinevirtual

Check whether an IV length is valid for this filter

Parameters

length

the IV length to be checked for validity

Returns

true if the IV length is valid, false otherwise

Reimplemented from Botan::Keyed_Filter.

Definition at line 63 of file cfb.h.

Referenced by set_iv().

         { return (iv_len == cipher->block_size()); }

bool Botan::Keyed_Filter::valid_keylength ( size_t  length ) const

inlineinherited

Check whether a key length is valid for this filter

Parameters

length

the key length to be checked for validity

Returns

true if the key length is valid, false otherwise

Definition at line 41 of file key_filt.h.

         {
         return key_spec().valid_keylength(length);
         }

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

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