Botan: Botan::StreamCipher_Filter Class Reference

Botan 1.10.17

Public Member Functions | Protected Member Functions | List of all members
Botan::StreamCipher_Filter Class Reference

`#include <filters.h>`

Inheritance diagram for Botan::StreamCipher_Filter:

## Public Member Functions
virtual bool | attachable ()
virtual void | end_msg ()
std::string | name () const
void | set_iv (const InitializationVector &iv)
void | set_key (const SymmetricKey &key)
virtual void | start_msg ()
| StreamCipher_Filter (StreamCipher *cipher_obj)
| StreamCipher_Filter (StreamCipher *cipher_obj, const SymmetricKey &key)
| StreamCipher_Filter (const std::string &cipher)
| StreamCipher_Filter (const std::string &cipher, const SymmetricKey &key)
bool | valid_iv_length (size_t iv_len) const
bool | valid_keylength (size_t length) const
void | write (const byte input[], size_t input_len)
| ~StreamCipher_Filter ()

## Protected Member Functions
void | send (const byte in[], size_t length)
void | send (byte in)
void | send (const MemoryRegion< byte > &in)
void | send (const MemoryRegion< byte > &in, size_t length)

## Detailed Description

Stream Cipher Filter.

Definition at line 33 of file filters.h.

## Constructor & Destructor Documentation

## ◆ StreamCipher_Filter() [1/4]

Botan::StreamCipher_Filter::StreamCipher_Filter | ( | StreamCipher * | cipher_obj | ) |

Construct a stream cipher filter.

Parameters

  cipher_obj | a cipher object to use

Definition at line 17 of file algo_filt.cpp.

17 :
18 buffer(DEFAULT_BUFFERSIZE)
19 {
20 cipher = stream_cipher;
21 }

## ◆ StreamCipher_Filter() [2/4]

Botan::StreamCipher_Filter::StreamCipher_Filter | ( | StreamCipher * | cipher_obj,
|  | const SymmetricKey & | key
| ) |  |

Construct a stream cipher filter.

Parameters

  cipher_obj | a cipher object to use
  key | the key to use inside this filter

Definition at line 26 of file algo_filt.cpp.

References Botan::SymmetricAlgorithm::set_key().

27 :
28 buffer(DEFAULT_BUFFERSIZE)
29 {
30 cipher = stream_cipher;
31 cipher->set_key(key);
32 }
Botan::SymmetricAlgorithm::set_key
void set_key(const SymmetricKey &key)
Definition: sym_algo.h:60

## ◆ StreamCipher_Filter() [3/4]

Botan::StreamCipher_Filter::StreamCipher_Filter | ( | const std::string & | cipher | ) |

Construct a stream cipher filter.

Parameters

  cipher | the name of the desired cipher

Definition at line 37 of file algo_filt.cpp.

References Botan::Library_State::algorithm_factory(), Botan::Global_State_Management::global_state(), and Botan::Algorithm_Factory::make_stream_cipher().

37 :
38 buffer(DEFAULT_BUFFERSIZE)
39 {
40 Algorithm_Factory& af = global_state().algorithm_factory();
41 cipher = af.make_stream_cipher(sc_name);
42 }
Botan::Library_State::algorithm_factory
Algorithm_Factory & algorithm_factory() const
Definition: libstate.cpp:173
Botan::Global_State_Management::global_state
Library_State & global_state()
Definition: global_state.cpp:32

## ◆ StreamCipher_Filter() [4/4]

Botan::StreamCipher_Filter::StreamCipher_Filter | ( | const std::string & | cipher,
|  | const SymmetricKey & | key
| ) |  |

Construct a stream cipher filter.

Parameters

  cipher | the name of the desired cipher
  key | the key to use inside this filter

Definition at line 47 of file algo_filt.cpp.

References Botan::Library_State::algorithm_factory(), Botan::Global_State_Management::global_state(), Botan::Algorithm_Factory::make_stream_cipher(), and Botan::SymmetricAlgorithm::set_key().

48 :
49 buffer(DEFAULT_BUFFERSIZE)
50 {
51 Algorithm_Factory& af = global_state().algorithm_factory();
52 cipher = af.make_stream_cipher(sc_name);
53 cipher->set_key(key);
54 }
Botan::Library_State::algorithm_factory
Algorithm_Factory & algorithm_factory() const
Definition: libstate.cpp:173
Botan::SymmetricAlgorithm::set_key
void set_key(const SymmetricKey &key)
Definition: sym_algo.h:60
Botan::Global_State_Management::global_state
Library_State & global_state()
Definition: global_state.cpp:32

## ◆ ~StreamCipher_Filter()

Botan::StreamCipher_Filter::~StreamCipher_Filter | ( |  | ) |
| inline

Definition at line 95 of file filters.h.

95 { delete cipher; }

## Member Function Documentation

## ◆ attachable()

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 50 of file filter.h.

50 { return true; }

## ◆ end_msg()

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::PK_Signer_Filter, Botan::Zlib_Decompression, Botan::Bzip_Decompression, Botan::PK_Decryptor_Filter, Botan::PBE_PKCS5v20, Botan::Base64_Encoder, Botan::Hex_Encoder, Botan::PBE_PKCS5v15, Botan::Bzip_Compression, Botan::Zlib_Compression, and Botan::PK_Encryptor_Filter.

Definition at line 44 of file filter.h.

44 {}

## ◆ name()

std::string Botan::StreamCipher_Filter::name | ( |  | ) | const
| inlinevirtual

Returns
  descriptive name for this filter

Implements Botan::Filter.

Definition at line 37 of file filters.h.

37 { return cipher->name(); }
Botan::Algorithm::name
virtual std::string name() const =0

## ◆ send() [1/4]

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

Parameters

  in | some input for the filter
  length | the length of in

Definition at line 28 of file filter.cpp.

References Botan::MemoryRegion< T >::clear(), Botan::MemoryRegion< T >::size(), and Botan::Filter::write().

Referenced by Botan::PK_Encryptor_Filter::end_msg(), Botan::Zlib_Compression::end_msg(), Botan::Bzip_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::Zlib_Decompression::end_msg(), Botan::PK_Signer_Filter::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::Bzip_Compression::write(), Botan::Zlib_Compression::write(), write(), Botan::Bzip_Decompression::write(), Botan::Zlib_Decompression::write(), Botan::Hex_Decoder::write(), and Botan::Base64_Decoder::write().

29 {
30 bool nothing_attached = true;
31 for(size_t j = 0; j != total_ports(); ++j)
32 if(next[j])
33 {
34 if(write_queue.size())
35 next[j]->write(&write_queue[0], write_queue.size());
36 next[j]->write(input, length);
37 nothing_attached = false;
38 }
39
40 if(nothing_attached)
41 write_queue += std::make_pair(input, length);
42 else
43 write_queue.clear();
44 }
Botan::Filter::write
virtual void write(const byte input[], size_t length)=0
Botan::MemoryRegion::clear
void clear()
Definition: secmem.h:158
Botan::MemoryRegion::size
size_t size() const
Definition: secmem.h:29

## ◆ send() [2/4]

void Botan::Filter::send | ( | byte | in | ) |
| inlineprotectedinherited

Parameters

  in | some input for the filter

Definition at line 63 of file filter.h.

References Botan::Filter::send().

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

63 { send(&in, 1); }
Botan::Filter::send
void send(const byte in[], size_t length)
Definition: filter.cpp:28

## ◆ send() [3/4]

void Botan::Filter::send | ( | const MemoryRegion< byte > & | in | ) |
| inlineprotectedinherited

Parameters

  in | some input for the filter

Definition at line 68 of file filter.h.

References Botan::Filter::send(), and Botan::MemoryRegion< T >::size().

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

68 { send(&in[0], in.size()); }
Botan::Filter::send
void send(const byte in[], size_t length)
Definition: filter.cpp:28
Botan::MemoryRegion::size
size_t size() const
Definition: secmem.h:29

## ◆ send() [4/4]

void Botan::Filter::send | ( | const MemoryRegion< 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 74 of file filter.h.

75 {
76 send(&in[0], length);
77 }
Botan::Filter::send
void send(const byte in[], size_t length)
Definition: filter.cpp:28

## ◆ set_iv()

void Botan::StreamCipher_Filter::set_iv | ( | const InitializationVector & | iv | ) |
| virtual

Set the initialization vector for this filter.

Parameters

  iv | the initialization vector to set

Reimplemented from Botan::Keyed_Filter.

Definition at line 59 of file algo_filt.cpp.

References Botan::OctetString::begin(), Botan::OctetString::length(), and Botan::StreamCipher::set_iv().

60 {
61 cipher->set_iv(iv.begin(), iv.length());
62 }
Botan::StreamCipher::set_iv
virtual void set_iv(const byte iv[], size_t iv_len)
Definition: stream_cipher.cpp:12

## ◆ set_key()

void Botan::StreamCipher_Filter::set_key | ( | const SymmetricKey & | key | ) |
| inlinevirtual

Set the key of this filter.

Parameters

  key | the key to set

Implements Botan::Keyed_Filter.

Definition at line 59 of file filters.h.

59 { cipher->set_key(key); }
Botan::SymmetricAlgorithm::set_key
void set_key(const SymmetricKey &key)
Definition: sym_algo.h:60

## ◆ start_msg()

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::EAX_Base, Botan::Bzip_Decompression, Botan::PBE_PKCS5v20, Botan::PBE_PKCS5v15, Botan::Bzip_Compression, and Botan::Zlib_Compression.

Definition at line 38 of file filter.h.

38 {}

## ◆ valid_iv_length()

bool Botan::StreamCipher_Filter::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 46 of file filters.h.

47 { return cipher->valid_iv_length(iv_len); }
Botan::StreamCipher::valid_iv_length
virtual bool valid_iv_length(size_t iv_len) const
Definition: stream_cipher.cpp:19

## ◆ valid_keylength()

bool Botan::StreamCipher_Filter::valid_keylength | ( | size_t | length | ) | const
| inlinevirtual

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

Implements Botan::Keyed_Filter.

Definition at line 66 of file filters.h.

67 { return cipher->valid_keylength(length); }
Botan::SymmetricAlgorithm::valid_keylength
bool valid_keylength(size_t length) const
Definition: sym_algo.h:51

## ◆ write()

void Botan::StreamCipher_Filter::write | ( | const byte | input[],
|  | size_t | input_len
| ) |  |
| virtual

Write input data

Parameters

  input | data
  input_len | length of input in bytes

Implements Botan::Filter.

Definition at line 67 of file algo_filt.cpp.

References Botan::StreamCipher::cipher(), Botan::Filter::send(), and Botan::MemoryRegion< T >::size().

68 {
69 while(length)
70 {
71 size_t copied = std::min<size_t>(length, buffer.size());
72 cipher->cipher(input, &buffer[0], copied);
73 send(buffer, copied);
74 input += copied;
75 length -= copied;
76 }
77 }
Botan::Filter::send
void send(const byte in[], size_t length)
Definition: filter.cpp:28
Botan::StreamCipher::cipher
virtual void cipher(const byte in[], byte out[], size_t len)=0
Botan::MemoryRegion::size
size_t size() const
Definition: secmem.h:29

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

- src/filters/filters.h
- src/filters/algo_filt.cpp