Botan  1.11.10
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Botan::Cascade_Cipher Class Reference

#include <cascade.h>

Inheritance diagram for Botan::Cascade_Cipher:
Botan::BlockCipher Botan::SymmetricAlgorithm

Public Member Functions

size_t block_size () const
 
 Cascade_Cipher (BlockCipher *cipher1, BlockCipher *cipher2)
 
 Cascade_Cipher (const Cascade_Cipher &)=delete
 
void clear ()
 
BlockCipherclone () const
 
void decrypt (const byte in[], byte out[]) const
 
void decrypt (byte block[]) const
 
template<typename Alloc >
void decrypt (std::vector< byte, Alloc > &block) const
 
template<typename Alloc , typename Alloc2 >
void decrypt (const std::vector< byte, Alloc > &in, std::vector< byte, Alloc2 > &out) const
 
void decrypt_n (const byte in[], byte out[], size_t blocks) const
 
void encrypt (const byte in[], byte out[]) const
 
void encrypt (byte block[]) const
 
template<typename Alloc >
void encrypt (std::vector< byte, Alloc > &block) const
 
template<typename Alloc , typename Alloc2 >
void encrypt (const std::vector< byte, Alloc > &in, std::vector< byte, Alloc2 > &out) const
 
void encrypt_n (const byte in[], byte out[], size_t blocks) const
 
Key_Length_Specification key_spec () const
 
size_t maximum_keylength () const
 
size_t minimum_keylength () const
 
std::string name () const
 
Cascade_Cipheroperator= (const Cascade_Cipher &)=delete
 
size_t parallel_bytes () const
 
virtual size_t parallelism () const
 
void set_key (const SymmetricKey &key)
 
template<typename Alloc >
void set_key (const std::vector< byte, Alloc > &key)
 
void set_key (const byte key[], size_t length)
 
bool valid_keylength (size_t length) const
 

Detailed Description

Block Cipher Cascade

Definition at line 18 of file cascade.h.

Constructor & Destructor Documentation

Botan::Cascade_Cipher::Cascade_Cipher ( BlockCipher cipher1,
BlockCipher cipher2 
)

Create a cascade of two block ciphers

Parameters
cipher1the first cipher
cipher2the second cipher

Definition at line 83 of file cascade.cpp.

References block_size(), Botan::BlockCipher::block_size(), and name().

Referenced by clone().

83  :
84  m_cipher1(c1), m_cipher2(c2)
85  {
86  m_block = block_size_for_cascade(c1->block_size(), c2->block_size());
87 
88  if(block_size() % c1->block_size() || block_size() % c2->block_size())
89  throw Internal_Error("Failure in " + name() + " constructor");
90  }
size_t block_size() const
Definition: cascade.h:24
std::string name() const
Definition: cascade.cpp:46
Botan::Cascade_Cipher::Cascade_Cipher ( const Cascade_Cipher )
delete

Member Function Documentation

size_t Botan::Cascade_Cipher::block_size ( ) const
inlinevirtual
Returns
block size of this algorithm

Implements Botan::BlockCipher.

Definition at line 24 of file cascade.h.

Referenced by Cascade_Cipher(), decrypt_n(), and encrypt_n().

24 { return m_block; }
void Botan::Cascade_Cipher::clear ( )
virtual

Implements Botan::SymmetricAlgorithm.

Definition at line 40 of file cascade.cpp.

41  {
42  m_cipher1->clear();
43  m_cipher2->clear();
44  }
BlockCipher * Botan::Cascade_Cipher::clone ( ) const
virtual
Returns
new object representing the same algorithm as *this

Implements Botan::BlockCipher.

Definition at line 51 of file cascade.cpp.

References Cascade_Cipher().

52  {
53  return new Cascade_Cipher(m_cipher1->clone(),
54  m_cipher2->clone());
55  }
Cascade_Cipher(BlockCipher *cipher1, BlockCipher *cipher2)
Definition: cascade.cpp:83
void Botan::BlockCipher::decrypt ( const byte  in[],
byte  out[] 
) const
inlineinherited

Decrypt a block.

Parameters
inThe ciphertext block to be decypted as a byte array. Must be of length block_size().
outThe byte array designated to hold the decrypted block. Must be of length block_size().

Definition at line 57 of file block_cipher.h.

Referenced by Botan::DESX::decrypt_n(), Botan::XTS_Decryption::finish(), and Botan::CTS_Decryption::finish().

58  { decrypt_n(in, out, 1); }
virtual void decrypt_n(const byte in[], byte out[], size_t blocks) const =0
void Botan::BlockCipher::decrypt ( byte  block[]) const
inlineinherited

Decrypt a block.

Parameters
blockthe ciphertext block to be decrypted Must be of length block_size(). Will hold the result when the function has finished.

Definition at line 74 of file block_cipher.h.

74 { decrypt_n(block, block, 1); }
virtual void decrypt_n(const byte in[], byte out[], size_t blocks) const =0
template<typename Alloc >
void Botan::BlockCipher::decrypt ( std::vector< byte, Alloc > &  block) const
inlineinherited

Decrypt one or more blocks

Parameters
blockthe input/output buffer (multiple of block_size())

Definition at line 91 of file block_cipher.h.

92  {
93  return decrypt_n(&block[0], &block[0], block.size() / block_size());
94  }
virtual void decrypt_n(const byte in[], byte out[], size_t blocks) const =0
virtual size_t block_size() const =0
template<typename Alloc , typename Alloc2 >
void Botan::BlockCipher::decrypt ( const std::vector< byte, Alloc > &  in,
std::vector< byte, Alloc2 > &  out 
) const
inlineinherited

Decrypt one or more blocks

Parameters
inthe input buffer (multiple of block_size())
outthe output buffer (same size as in)

Definition at line 114 of file block_cipher.h.

116  {
117  return decrypt_n(&in[0], &out[0], in.size() / block_size());
118  }
virtual void decrypt_n(const byte in[], byte out[], size_t blocks) const =0
virtual size_t block_size() const =0
void Botan::Cascade_Cipher::decrypt_n ( const byte  in[],
byte  out[],
size_t  blocks 
) const
virtual

Decrypt one or more blocks

Parameters
inthe input buffer (multiple of block_size())
outthe output buffer (same size as in)
blocksthe number of blocks to process

Implements Botan::BlockCipher.

Definition at line 22 of file cascade.cpp.

References block_size().

24  {
25  size_t c1_blocks = blocks * (block_size() / m_cipher1->block_size());
26  size_t c2_blocks = blocks * (block_size() / m_cipher2->block_size());
27 
28  m_cipher2->decrypt_n(in, out, c2_blocks);
29  m_cipher1->decrypt_n(out, out, c1_blocks);
30  }
size_t block_size() const
Definition: cascade.h:24
void Botan::BlockCipher::encrypt ( const byte  in[],
byte  out[] 
) const
inlineinherited

Encrypt a block.

Parameters
inThe plaintext block to be encrypted as a byte array. Must be of length block_size().
outThe byte array designated to hold the encrypted block. Must be of length block_size().

Definition at line 47 of file block_cipher.h.

Referenced by Botan::aont_package(), Botan::aont_unpackage(), Botan::DESX::encrypt_n(), Botan::XTS_Encryption::finish(), Botan::CTS_Encryption::finish(), Botan::CFB_Mode::start(), Botan::CBC_Encryption::update(), Botan::CFB_Encryption::update(), and Botan::CFB_Decryption::update().

48  { encrypt_n(in, out, 1); }
virtual void encrypt_n(const byte in[], byte out[], size_t blocks) const =0
void Botan::BlockCipher::encrypt ( byte  block[]) const
inlineinherited

Encrypt a block.

Parameters
blockthe plaintext block to be encrypted Must be of length block_size(). Will hold the result when the function has finished.

Definition at line 66 of file block_cipher.h.

66 { encrypt_n(block, block, 1); }
virtual void encrypt_n(const byte in[], byte out[], size_t blocks) const =0
template<typename Alloc >
void Botan::BlockCipher::encrypt ( std::vector< byte, Alloc > &  block) const
inlineinherited

Encrypt one or more blocks

Parameters
blockthe input/output buffer (multiple of block_size())

Definition at line 81 of file block_cipher.h.

82  {
83  return encrypt_n(&block[0], &block[0], block.size() / block_size());
84  }
virtual void encrypt_n(const byte in[], byte out[], size_t blocks) const =0
virtual size_t block_size() const =0
template<typename Alloc , typename Alloc2 >
void Botan::BlockCipher::encrypt ( const std::vector< byte, Alloc > &  in,
std::vector< byte, Alloc2 > &  out 
) const
inlineinherited

Encrypt one or more blocks

Parameters
inthe input buffer (multiple of block_size())
outthe output buffer (same size as in)

Definition at line 102 of file block_cipher.h.

104  {
105  return encrypt_n(&in[0], &out[0], in.size() / block_size());
106  }
virtual void encrypt_n(const byte in[], byte out[], size_t blocks) const =0
virtual size_t block_size() const =0
void Botan::Cascade_Cipher::encrypt_n ( const byte  in[],
byte  out[],
size_t  blocks 
) const
virtual

Encrypt one or more blocks

Parameters
inthe input buffer (multiple of block_size())
outthe output buffer (same size as in)
blocksthe number of blocks to process

Implements Botan::BlockCipher.

Definition at line 12 of file cascade.cpp.

References block_size().

14  {
15  size_t c1_blocks = blocks * (block_size() / m_cipher1->block_size());
16  size_t c2_blocks = blocks * (block_size() / m_cipher2->block_size());
17 
18  m_cipher1->encrypt_n(in, out, c1_blocks);
19  m_cipher2->encrypt_n(out, out, c2_blocks);
20  }
size_t block_size() const
Definition: cascade.h:24
Key_Length_Specification Botan::Cascade_Cipher::key_spec ( ) const
inlinevirtual
Returns
object describing limits on key size

Implements Botan::SymmetricAlgorithm.

Definition at line 26 of file cascade.h.

27  {
28  return Key_Length_Specification(m_cipher1->maximum_keylength() +
29  m_cipher2->maximum_keylength());
30  }
size_t Botan::SymmetricAlgorithm::maximum_keylength ( ) const
inlineinherited
Returns
minimum allowed key length

Definition at line 36 of file sym_algo.h.

Referenced by Botan::PBE_PKCS5v20::PBE_PKCS5v20().

37  {
38  return key_spec().maximum_keylength();
39  }
size_t maximum_keylength() const
Definition: key_spec.h:69
virtual Key_Length_Specification key_spec() const =0
size_t Botan::SymmetricAlgorithm::minimum_keylength ( ) const
inlineinherited
Returns
maxmium allowed key length

Definition at line 44 of file sym_algo.h.

45  {
46  return key_spec().minimum_keylength();
47  }
size_t minimum_keylength() const
Definition: key_spec.h:61
virtual Key_Length_Specification key_spec() const =0
std::string Botan::Cascade_Cipher::name ( ) const
virtual

Implements Botan::SymmetricAlgorithm.

Definition at line 46 of file cascade.cpp.

Referenced by Cascade_Cipher().

47  {
48  return "Cascade(" + m_cipher1->name() + "," + m_cipher2->name() + ")";
49  }
Cascade_Cipher& Botan::Cascade_Cipher::operator= ( const Cascade_Cipher )
delete
size_t Botan::BlockCipher::parallel_bytes ( ) const
inlineinherited
Returns
prefererred parallelism of this cipher in bytes

Definition at line 35 of file block_cipher.h.

Referenced by Botan::XTS_Mode::update_granularity(), Botan::ECB_Mode::update_granularity(), and Botan::CBC_Mode::update_granularity().

36  {
37  return parallelism() * block_size() * BOTAN_BLOCK_CIPHER_PAR_MULT;
38  }
virtual size_t parallelism() const
Definition: block_cipher.h:30
virtual size_t block_size() const =0
virtual size_t Botan::BlockCipher::parallelism ( ) const
inlinevirtualinherited
Returns
native parallelism of this cipher in blocks

Reimplemented in Botan::AES_256_NI, Botan::AES_192_NI, Botan::AES_128_NI, Botan::IDEA_SSE2, Botan::Noekeon_SIMD, Botan::Serpent_SIMD, and Botan::XTEA_SIMD.

Definition at line 30 of file block_cipher.h.

30 { return 1; }
void Botan::SymmetricAlgorithm::set_key ( const SymmetricKey key)
inlineinherited

Set the symmetric key of this object.

Parameters
keythe SymmetricKey to be set.

Definition at line 63 of file sym_algo.h.

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

Referenced by Botan::aont_package(), Botan::aont_unpackage(), Botan::MAC_Filter::MAC_Filter(), and Botan::StreamCipher_Filter::StreamCipher_Filter().

64  {
65  set_key(key.begin(), key.length());
66  }
void set_key(const SymmetricKey &key)
Definition: sym_algo.h:63
template<typename Alloc >
void Botan::SymmetricAlgorithm::set_key ( const std::vector< byte, Alloc > &  key)
inlineinherited

Definition at line 69 of file sym_algo.h.

70  {
71  set_key(&key[0], key.size());
72  }
void set_key(const SymmetricKey &key)
Definition: sym_algo.h:63
void Botan::SymmetricAlgorithm::set_key ( const byte  key[],
size_t  length 
)
inlineinherited

Set the symmetric key of this object.

Parameters
keythe to be set as a byte array.
lengthin bytes of key param

Definition at line 79 of file sym_algo.h.

80  {
81  if(!valid_keylength(length))
82  throw Invalid_Key_Length(name(), length);
83  key_schedule(key, length);
84  }
bool valid_keylength(size_t length) const
Definition: sym_algo.h:54
virtual std::string name() const =0
bool Botan::SymmetricAlgorithm::valid_keylength ( size_t  length) const
inlineinherited

Check whether a given key length is valid for this algorithm.

Parameters
lengththe key length to be checked.
Returns
true if the key length is valid.

Definition at line 54 of file sym_algo.h.

Referenced by Botan::aont_package(), and Botan::aont_unpackage().

55  {
56  return key_spec().valid_keylength(length);
57  }
bool valid_keylength(size_t length) const
Definition: key_spec.h:51
virtual Key_Length_Specification key_spec() const =0

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