Botan  1.11.15
Public Types | Public Member Functions
Botan::CAST_256 Class Reference

#include <cast256.h>

Inheritance diagram for Botan::CAST_256:
Botan::Block_Cipher_Fixed_Params< 16, 4, 32, 4 > Botan::BlockCipher Botan::SymmetricAlgorithm

List of all members.

Public Types

enum  
typedef SCAN_Name Spec

Public Member Functions

size_t block_size () const
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
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

CAST-256

Definition at line 18 of file cast256.h.


Member Typedef Documentation

typedef SCAN_Name Botan::BlockCipher::Spec [inherited]

Definition at line 22 of file block_cipher.h.


Member Enumeration Documentation

anonymous enum [inherited]

Definition at line 153 of file block_cipher.h.

{ BLOCK_SIZE = BS };

Member Function Documentation

size_t Botan::Block_Cipher_Fixed_Params< BS, KMIN, KMAX, KMOD >::block_size ( ) const [inline, virtual, inherited]
Returns:
block size of this algorithm

Implements Botan::BlockCipher.

Definition at line 154 of file block_cipher.h.

{ return BS; }
void Botan::CAST_256::clear ( ) [virtual]

Implements Botan::SymmetricAlgorithm.

Definition at line 223 of file cast256.cpp.

References Botan::zap().

   {
   zap(MK);
   zap(RK);
   }
BlockCipher* Botan::CAST_256::clone ( ) const [inline, virtual]
Returns:
new object representing the same algorithm as *this

Implements Botan::BlockCipher.

Definition at line 26 of file cast256.h.

{ return new CAST_256; }
void Botan::BlockCipher::decrypt ( const byte  in[],
byte  out[] 
) const [inline, inherited]

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 59 of file block_cipher.h.

Referenced by Botan::Camellia_128::decrypt_n(), Botan::DESX::decrypt_n(), Botan::Camellia_192::decrypt_n(), Botan::Camellia_256::decrypt_n(), Botan::XTS_Decryption::finish(), and Botan::CTS_Decryption::finish().

         { decrypt_n(in, out, 1); }
void Botan::BlockCipher::decrypt ( byte  block[]) const [inline, inherited]

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 76 of file block_cipher.h.

{ decrypt_n(block, block, 1); }
template<typename Alloc >
void Botan::BlockCipher::decrypt ( std::vector< byte, Alloc > &  block) const [inline, inherited]

Decrypt one or more blocks

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

Definition at line 93 of file block_cipher.h.

         {
         return decrypt_n(&block[0], &block[0], block.size() / block_size());
         }
template<typename Alloc , typename Alloc2 >
void Botan::BlockCipher::decrypt ( const std::vector< byte, Alloc > &  in,
std::vector< byte, Alloc2 > &  out 
) const [inline, inherited]

Decrypt one or more blocks

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

Definition at line 116 of file block_cipher.h.

         {
         return decrypt_n(&in[0], &out[0], in.size() / block_size());
         }
void Botan::CAST_256::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 97 of file cast256.cpp.

References Botan::Block_Cipher_Fixed_Params< 16, 4, 32, 4 >::BLOCK_SIZE, Botan::load_be< u32bit >(), and Botan::store_be().

   {
   for(size_t i = 0; i != blocks; ++i)
      {
      u32bit A = load_be<u32bit>(in, 0);
      u32bit B = load_be<u32bit>(in, 1);
      u32bit C = load_be<u32bit>(in, 2);
      u32bit D = load_be<u32bit>(in, 3);

      round1(C, D, MK[44], RK[44]); round2(B, C, MK[45], RK[45]);
      round3(A, B, MK[46], RK[46]); round1(D, A, MK[47], RK[47]);
      round1(C, D, MK[40], RK[40]); round2(B, C, MK[41], RK[41]);
      round3(A, B, MK[42], RK[42]); round1(D, A, MK[43], RK[43]);
      round1(C, D, MK[36], RK[36]); round2(B, C, MK[37], RK[37]);
      round3(A, B, MK[38], RK[38]); round1(D, A, MK[39], RK[39]);
      round1(C, D, MK[32], RK[32]); round2(B, C, MK[33], RK[33]);
      round3(A, B, MK[34], RK[34]); round1(D, A, MK[35], RK[35]);
      round1(C, D, MK[28], RK[28]); round2(B, C, MK[29], RK[29]);
      round3(A, B, MK[30], RK[30]); round1(D, A, MK[31], RK[31]);
      round1(C, D, MK[24], RK[24]); round2(B, C, MK[25], RK[25]);
      round3(A, B, MK[26], RK[26]); round1(D, A, MK[27], RK[27]);
      round1(D, A, MK[23], RK[23]); round3(A, B, MK[22], RK[22]);
      round2(B, C, MK[21], RK[21]); round1(C, D, MK[20], RK[20]);
      round1(D, A, MK[19], RK[19]); round3(A, B, MK[18], RK[18]);
      round2(B, C, MK[17], RK[17]); round1(C, D, MK[16], RK[16]);
      round1(D, A, MK[15], RK[15]); round3(A, B, MK[14], RK[14]);
      round2(B, C, MK[13], RK[13]); round1(C, D, MK[12], RK[12]);
      round1(D, A, MK[11], RK[11]); round3(A, B, MK[10], RK[10]);
      round2(B, C, MK[ 9], RK[ 9]); round1(C, D, MK[ 8], RK[ 8]);
      round1(D, A, MK[ 7], RK[ 7]); round3(A, B, MK[ 6], RK[ 6]);
      round2(B, C, MK[ 5], RK[ 5]); round1(C, D, MK[ 4], RK[ 4]);
      round1(D, A, MK[ 3], RK[ 3]); round3(A, B, MK[ 2], RK[ 2]);
      round2(B, C, MK[ 1], RK[ 1]); round1(C, D, MK[ 0], RK[ 0]);

      store_be(out, A, B, C, D);

      in += BLOCK_SIZE;
      out += BLOCK_SIZE;
      }
   }
void Botan::BlockCipher::encrypt ( const byte  in[],
byte  out[] 
) const [inline, inherited]

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 49 of file block_cipher.h.

Referenced by Botan::aont_package(), Botan::aont_unpackage(), Botan::DESX::encrypt_n(), Botan::Camellia_128::encrypt_n(), Botan::Camellia_192::encrypt_n(), Botan::Camellia_256::encrypt_n(), Botan::XTS_Encryption::finish(), Botan::CTS_Encryption::finish(), Botan::CBC_Encryption::update(), Botan::CFB_Encryption::update(), and Botan::CFB_Decryption::update().

         { encrypt_n(in, out, 1); }
void Botan::BlockCipher::encrypt ( byte  block[]) const [inline, inherited]

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 68 of file block_cipher.h.

{ encrypt_n(block, block, 1); }
template<typename Alloc >
void Botan::BlockCipher::encrypt ( std::vector< byte, Alloc > &  block) const [inline, inherited]

Encrypt one or more blocks

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

Definition at line 83 of file block_cipher.h.

         {
         return encrypt_n(&block[0], &block[0], block.size() / block_size());
         }
template<typename Alloc , typename Alloc2 >
void Botan::BlockCipher::encrypt ( const std::vector< byte, Alloc > &  in,
std::vector< byte, Alloc2 > &  out 
) const [inline, inherited]

Encrypt one or more blocks

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

Definition at line 104 of file block_cipher.h.

         {
         return encrypt_n(&in[0], &out[0], in.size() / block_size());
         }
void Botan::CAST_256::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 53 of file cast256.cpp.

References Botan::Block_Cipher_Fixed_Params< 16, 4, 32, 4 >::BLOCK_SIZE, Botan::load_be< u32bit >(), and Botan::store_be().

   {
   for(size_t i = 0; i != blocks; ++i)
      {
      u32bit A = load_be<u32bit>(in, 0);
      u32bit B = load_be<u32bit>(in, 1);
      u32bit C = load_be<u32bit>(in, 2);
      u32bit D = load_be<u32bit>(in, 3);

      round1(C, D, MK[ 0], RK[ 0]); round2(B, C, MK[ 1], RK[ 1]);
      round3(A, B, MK[ 2], RK[ 2]); round1(D, A, MK[ 3], RK[ 3]);
      round1(C, D, MK[ 4], RK[ 4]); round2(B, C, MK[ 5], RK[ 5]);
      round3(A, B, MK[ 6], RK[ 6]); round1(D, A, MK[ 7], RK[ 7]);
      round1(C, D, MK[ 8], RK[ 8]); round2(B, C, MK[ 9], RK[ 9]);
      round3(A, B, MK[10], RK[10]); round1(D, A, MK[11], RK[11]);
      round1(C, D, MK[12], RK[12]); round2(B, C, MK[13], RK[13]);
      round3(A, B, MK[14], RK[14]); round1(D, A, MK[15], RK[15]);
      round1(C, D, MK[16], RK[16]); round2(B, C, MK[17], RK[17]);
      round3(A, B, MK[18], RK[18]); round1(D, A, MK[19], RK[19]);
      round1(C, D, MK[20], RK[20]); round2(B, C, MK[21], RK[21]);
      round3(A, B, MK[22], RK[22]); round1(D, A, MK[23], RK[23]);
      round1(D, A, MK[27], RK[27]); round3(A, B, MK[26], RK[26]);
      round2(B, C, MK[25], RK[25]); round1(C, D, MK[24], RK[24]);
      round1(D, A, MK[31], RK[31]); round3(A, B, MK[30], RK[30]);
      round2(B, C, MK[29], RK[29]); round1(C, D, MK[28], RK[28]);
      round1(D, A, MK[35], RK[35]); round3(A, B, MK[34], RK[34]);
      round2(B, C, MK[33], RK[33]); round1(C, D, MK[32], RK[32]);
      round1(D, A, MK[39], RK[39]); round3(A, B, MK[38], RK[38]);
      round2(B, C, MK[37], RK[37]); round1(C, D, MK[36], RK[36]);
      round1(D, A, MK[43], RK[43]); round3(A, B, MK[42], RK[42]);
      round2(B, C, MK[41], RK[41]); round1(C, D, MK[40], RK[40]);
      round1(D, A, MK[47], RK[47]); round3(A, B, MK[46], RK[46]);
      round2(B, C, MK[45], RK[45]); round1(C, D, MK[44], RK[44]);

      store_be(out, A, B, C, D);

      in += BLOCK_SIZE;
      out += BLOCK_SIZE;
      }
   }
Key_Length_Specification Botan::Block_Cipher_Fixed_Params< BS, KMIN, KMAX, KMOD >::key_spec ( ) const [inline, virtual, inherited]
Returns:
object describing limits on key size

Implements Botan::SymmetricAlgorithm.

Definition at line 156 of file block_cipher.h.

         {
         return Key_Length_Specification(KMIN, KMAX, KMOD);
         }
size_t Botan::SymmetricAlgorithm::maximum_keylength ( ) const [inline, inherited]
Returns:
minimum allowed key length

Definition at line 36 of file sym_algo.h.

References Botan::Key_Length_Specification::maximum_keylength().

         {
         return key_spec().maximum_keylength();
         }
size_t Botan::SymmetricAlgorithm::minimum_keylength ( ) const [inline, inherited]
Returns:
maxmium allowed key length

Definition at line 44 of file sym_algo.h.

         {
         return key_spec().minimum_keylength();
         }
std::string Botan::CAST_256::name ( ) const [inline, virtual]

Implements Botan::SymmetricAlgorithm.

Definition at line 25 of file cast256.h.

{ return "CAST-256"; }
size_t Botan::BlockCipher::parallel_bytes ( ) const [inline, inherited]
Returns:
prefererred parallelism of this cipher in bytes

Definition at line 37 of file block_cipher.h.

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

         {
         return parallelism() * block_size() * BOTAN_BLOCK_CIPHER_PAR_MULT;
         }
virtual size_t Botan::BlockCipher::parallelism ( ) const [inline, virtual, inherited]
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 32 of file block_cipher.h.

{ return 1; }
void Botan::SymmetricAlgorithm::set_key ( const SymmetricKey key) [inline, inherited]

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_set_key(), Botan::TLS::Session::decrypt(), Botan::TLS::Session::encrypt(), and Botan::pbkdf2().

         {
         set_key(key.begin(), key.length());
         }
template<typename Alloc >
void Botan::SymmetricAlgorithm::set_key ( const std::vector< byte, Alloc > &  key) [inline, inherited]

Definition at line 69 of file sym_algo.h.

         {
         set_key(&key[0], key.size());
         }
void Botan::SymmetricAlgorithm::set_key ( const byte  key[],
size_t  length 
) [inline, inherited]

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.

         {
         if(!valid_keylength(length))
            throw Invalid_Key_Length(name(), length);
         key_schedule(key, length);
         }
bool Botan::SymmetricAlgorithm::valid_keylength ( size_t  length) const [inline, inherited]

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().

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

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