Botan  1.10.9
Public Types | Public Member Functions | List of all members
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 Botan::Algorithm

Public Types

enum  
 

Public Member Functions

size_t block_size () const
 
 CAST_256 ()
 
void clear ()
 
BlockCipherclone () const
 
void decrypt (const byte in[], byte out[]) const
 
void decrypt (byte block[]) 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
 
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)
 
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 Enumeration Documentation

anonymous enum
inherited

Constructor & Destructor Documentation

Botan::CAST_256::CAST_256 ( )
inline

Definition at line 28 of file cast256.h.

28 : MK(48), RK(48) {}

Member Function Documentation

size_t Botan::Block_Cipher_Fixed_Params< BS, KMIN, KMAX, KMOD >::block_size ( ) const
inlinevirtualinherited
Returns
block size of this algorithm

Implements Botan::BlockCipher.

Definition at line 108 of file block_cipher.h.

108 { return BS; }
void Botan::CAST_256::clear ( )
inlinevirtual

Zeroize internal state

Implements Botan::Algorithm.

Definition at line 24 of file cast256.h.

References Botan::zeroise().

24 { zeroise(MK); zeroise(RK); }
void zeroise(MemoryRegion< T > &vec)
Definition: secmem.h:415
BlockCipher* Botan::CAST_256::clone ( ) const
inlinevirtual

Get a new object representing the same algorithm as *this

Implements Botan::BlockCipher.

Definition at line 26 of file cast256.h.

26 { return new CAST_256; }
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().

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
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 95 of file cast256.cpp.

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

96  {
97  for(size_t i = 0; i != blocks; ++i)
98  {
99  u32bit A = load_be<u32bit>(in, 0);
100  u32bit B = load_be<u32bit>(in, 1);
101  u32bit C = load_be<u32bit>(in, 2);
102  u32bit D = load_be<u32bit>(in, 3);
103 
104  round1(C, D, MK[44], RK[44]); round2(B, C, MK[45], RK[45]);
105  round3(A, B, MK[46], RK[46]); round1(D, A, MK[47], RK[47]);
106  round1(C, D, MK[40], RK[40]); round2(B, C, MK[41], RK[41]);
107  round3(A, B, MK[42], RK[42]); round1(D, A, MK[43], RK[43]);
108  round1(C, D, MK[36], RK[36]); round2(B, C, MK[37], RK[37]);
109  round3(A, B, MK[38], RK[38]); round1(D, A, MK[39], RK[39]);
110  round1(C, D, MK[32], RK[32]); round2(B, C, MK[33], RK[33]);
111  round3(A, B, MK[34], RK[34]); round1(D, A, MK[35], RK[35]);
112  round1(C, D, MK[28], RK[28]); round2(B, C, MK[29], RK[29]);
113  round3(A, B, MK[30], RK[30]); round1(D, A, MK[31], RK[31]);
114  round1(C, D, MK[24], RK[24]); round2(B, C, MK[25], RK[25]);
115  round3(A, B, MK[26], RK[26]); round1(D, A, MK[27], RK[27]);
116  round1(D, A, MK[23], RK[23]); round3(A, B, MK[22], RK[22]);
117  round2(B, C, MK[21], RK[21]); round1(C, D, MK[20], RK[20]);
118  round1(D, A, MK[19], RK[19]); round3(A, B, MK[18], RK[18]);
119  round2(B, C, MK[17], RK[17]); round1(C, D, MK[16], RK[16]);
120  round1(D, A, MK[15], RK[15]); round3(A, B, MK[14], RK[14]);
121  round2(B, C, MK[13], RK[13]); round1(C, D, MK[12], RK[12]);
122  round1(D, A, MK[11], RK[11]); round3(A, B, MK[10], RK[10]);
123  round2(B, C, MK[ 9], RK[ 9]); round1(C, D, MK[ 8], RK[ 8]);
124  round1(D, A, MK[ 7], RK[ 7]); round3(A, B, MK[ 6], RK[ 6]);
125  round2(B, C, MK[ 5], RK[ 5]); round1(C, D, MK[ 4], RK[ 4]);
126  round1(D, A, MK[ 3], RK[ 3]); round3(A, B, MK[ 2], RK[ 2]);
127  round2(B, C, MK[ 1], RK[ 1]); round1(C, D, MK[ 0], RK[ 0]);
128 
129  store_be(out, A, B, C, D);
130 
131  in += BLOCK_SIZE;
132  out += BLOCK_SIZE;
133  }
134  }
u32bit load_be< u32bit >(const byte in[], size_t off)
Definition: loadstor.h:166
void store_be(u16bit in, byte out[2])
Definition: loadstor.h:412
unsigned int u32bit
Definition: types.h:32
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::OFB::cipher(), Botan::DESX::encrypt_n(), Botan::CFB_Encryption::set_iv(), Botan::OFB::set_iv(), Botan::XTS_Encryption::set_iv(), Botan::CFB_Decryption::set_iv(), and Botan::XTS_Decryption::set_iv().

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
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 51 of file cast256.cpp.

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

52  {
53  for(size_t i = 0; i != blocks; ++i)
54  {
55  u32bit A = load_be<u32bit>(in, 0);
56  u32bit B = load_be<u32bit>(in, 1);
57  u32bit C = load_be<u32bit>(in, 2);
58  u32bit D = load_be<u32bit>(in, 3);
59 
60  round1(C, D, MK[ 0], RK[ 0]); round2(B, C, MK[ 1], RK[ 1]);
61  round3(A, B, MK[ 2], RK[ 2]); round1(D, A, MK[ 3], RK[ 3]);
62  round1(C, D, MK[ 4], RK[ 4]); round2(B, C, MK[ 5], RK[ 5]);
63  round3(A, B, MK[ 6], RK[ 6]); round1(D, A, MK[ 7], RK[ 7]);
64  round1(C, D, MK[ 8], RK[ 8]); round2(B, C, MK[ 9], RK[ 9]);
65  round3(A, B, MK[10], RK[10]); round1(D, A, MK[11], RK[11]);
66  round1(C, D, MK[12], RK[12]); round2(B, C, MK[13], RK[13]);
67  round3(A, B, MK[14], RK[14]); round1(D, A, MK[15], RK[15]);
68  round1(C, D, MK[16], RK[16]); round2(B, C, MK[17], RK[17]);
69  round3(A, B, MK[18], RK[18]); round1(D, A, MK[19], RK[19]);
70  round1(C, D, MK[20], RK[20]); round2(B, C, MK[21], RK[21]);
71  round3(A, B, MK[22], RK[22]); round1(D, A, MK[23], RK[23]);
72  round1(D, A, MK[27], RK[27]); round3(A, B, MK[26], RK[26]);
73  round2(B, C, MK[25], RK[25]); round1(C, D, MK[24], RK[24]);
74  round1(D, A, MK[31], RK[31]); round3(A, B, MK[30], RK[30]);
75  round2(B, C, MK[29], RK[29]); round1(C, D, MK[28], RK[28]);
76  round1(D, A, MK[35], RK[35]); round3(A, B, MK[34], RK[34]);
77  round2(B, C, MK[33], RK[33]); round1(C, D, MK[32], RK[32]);
78  round1(D, A, MK[39], RK[39]); round3(A, B, MK[38], RK[38]);
79  round2(B, C, MK[37], RK[37]); round1(C, D, MK[36], RK[36]);
80  round1(D, A, MK[43], RK[43]); round3(A, B, MK[42], RK[42]);
81  round2(B, C, MK[41], RK[41]); round1(C, D, MK[40], RK[40]);
82  round1(D, A, MK[47], RK[47]); round3(A, B, MK[46], RK[46]);
83  round2(B, C, MK[45], RK[45]); round1(C, D, MK[44], RK[44]);
84 
85  store_be(out, A, B, C, D);
86 
87  in += BLOCK_SIZE;
88  out += BLOCK_SIZE;
89  }
90  }
u32bit load_be< u32bit >(const byte in[], size_t off)
Definition: loadstor.h:166
void store_be(u16bit in, byte out[2])
Definition: loadstor.h:412
unsigned int u32bit
Definition: types.h:32
Key_Length_Specification Botan::Block_Cipher_Fixed_Params< BS, KMIN, KMAX, KMOD >::key_spec ( ) const
inlinevirtualinherited
Returns
object describing limits on key size

Implements Botan::SymmetricAlgorithm.

Definition at line 110 of file block_cipher.h.

111  {
112  return Key_Length_Specification(KMIN, KMAX, KMOD);
113  }
size_t Botan::SymmetricAlgorithm::maximum_keylength ( ) const
inlineinherited
Returns
minimum allowed key length

Definition at line 33 of file sym_algo.h.

34  {
35  return key_spec().maximum_keylength();
36  }
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 41 of file sym_algo.h.

42  {
43  return key_spec().minimum_keylength();
44  }
size_t minimum_keylength() const
Definition: key_spec.h:61
virtual Key_Length_Specification key_spec() const =0
std::string Botan::CAST_256::name ( ) const
inlinevirtual
Returns
name of this algorithm

Implements Botan::Algorithm.

Definition at line 25 of file cast256.h.

25 { return "CAST-256"; }
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.

References block_size.

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
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 68 of file sym_algo.h.

69  {
70  if(!valid_keylength(length))
71  throw Invalid_Key_Length(name(), length);
72  key_schedule(key, length);
73  }
bool valid_keylength(size_t length) const
Definition: sym_algo.h:51
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 51 of file sym_algo.h.

Referenced by Botan::aont_package(), Botan::aont_unpackage(), Botan::HMAC_RNG::HMAC_RNG(), Botan::Lion::Lion(), Botan::Randpool::Randpool(), and Botan::EAX_Base::valid_keylength().

52  {
53  return key_spec().valid_keylength(length);
54  }
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: