Crypto++ 8.2 Free C++ class library of cryptographic schemes

twofish.h
Go to the documentation of this file.
1 // twofish.h - originally written and placed in the public domain by Wei Dai
2
3 /// \file twofish.h
4 /// \brief Classes for the Twofish block cipher
5
6 #ifndef CRYPTOPP_TWOFISH_H
7 #define CRYPTOPP_TWOFISH_H
8
9 #include "seckey.h"
10 #include "secblock.h"
11
12 NAMESPACE_BEGIN(CryptoPP)
13
14 /// \brief Twofish block cipher information
15 /// \since Crypto++ 3.1
16 struct Twofish_Info : public FixedBlockSize<16>, public VariableKeyLength<16, 16, 32, 8>, FixedRounds<16>
17 {
18 CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() {return "Twofish";}
19 };
20
21 /// \brief Twofish block cipher
22 /// \sa <a href="http://www.cryptopp.com/wiki/Twofish">Twofish</a>
23 /// \since Crypto++ 3.1
24 class Twofish : public Twofish_Info, public BlockCipherDocumentation
25 {
26 class CRYPTOPP_NO_VTABLE Base : public BlockCipherImpl<Twofish_Info>
27 {
28 public:
29 void UncheckedSetKey(const byte *userKey, unsigned int length, const NameValuePairs &params);
30
31 protected:
32 static word32 h0(word32 x, const word32 *key, unsigned int kLen);
33 static word32 h(word32 x, const word32 *key, unsigned int kLen);
34
35 static const byte q[2][256];
36 static const word32 mds[4][256];
37
38 FixedSizeSecBlock<word32, 40> m_k;
39 FixedSizeSecBlock<word32, 4*256> m_s;
40 };
41
42 class CRYPTOPP_NO_VTABLE Enc : public Base
43 {
44 public:
45 void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
46 };
47
48 class CRYPTOPP_NO_VTABLE Dec : public Base
49 {
50 public:
51 void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
52 };
53
54 public:
55 typedef BlockCipherFinal<ENCRYPTION, Enc> Encryption;
56 typedef BlockCipherFinal<DECRYPTION, Dec> Decryption;
57 };
58
59 typedef Twofish::Encryption TwofishEncryption;
60 typedef Twofish::Decryption TwofishDecryption;
61
62 NAMESPACE_END
63
64 #endif
BlockCipherDocumentation
Provides Encryption and Decryption typedefs used by derived classes to implement a block cipher...
Definition: seckey.h:398
BlockCipher
Interface for one direction (encryption or decryption) of a block cipher.
Definition: cryptlib.h:1278
secblock.h
Classes and functions for secure memory allocations.
FixedBlockSize
Inherited by algorithms with fixed block size.
Definition: seckey.h:40
Twofish
Twofish block cipher.
Definition: twofish.h:24
Twofish_Info
Twofish block cipher information.
Definition: twofish.h:16
seckey.h
Classes and functions for implementing secret key algorithms.
BlockCipherFinal< ENCRYPTION, Enc >
FixedSizeSecBlock< word32, 40 >
FixedRounds
Inherited by algorithms with fixed number of rounds.
Definition: seckey.h:52
VariableKeyLength
Inherited by keyed algorithms with variable key length.
Definition: seckey.h:165
BlockCipherImpl
Provides a base implementation of Algorithm and SimpleKeyingInterface for block ciphers.
Definition: seckey.h:305
CryptoPP
Crypto++ library namespace.
NameValuePairs
Interface for retrieving values given their names.
Definition: cryptlib.h:321