Crypto++ 8.9 Free C++ class library of cryptographic schemes

twofish.h
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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
BlockCipherFinal< ENCRYPTION, Enc >
BlockCipher
Interface for one direction (encryption or decryption) of a block cipher.
Definition: cryptlib.h:1288
BlockCipherImpl
Provides a base implementation of Algorithm and SimpleKeyingInterface for block ciphers.
Definition: seckey.h:306
FixedBlockSize
Inherited by algorithms with fixed block size.
Definition: seckey.h:41
FixedRounds
Inherited by algorithms with fixed number of rounds.
Definition: seckey.h:53
FixedSizeSecBlock< word32, 40 >
NameValuePairs
Interface for retrieving values given their names.
Definition: cryptlib.h:327
Twofish
Twofish block cipher.
Definition: twofish.h:25
VariableKeyLength
Inherited by keyed algorithms with variable key length.
Definition: seckey.h:166
word32
unsigned int word32
32-bit unsigned datatype
Definition: config_int.h:72
CryptoPP
Crypto++ library namespace.
secblock.h
Classes and functions for secure memory allocations.
seckey.h
Classes and functions for implementing secret key algorithms.
BlockCipherDocumentation
Provides Encryption and Decryption typedefs used by derived classes to implement a block cipher.
Definition: seckey.h:399
Twofish_Info
Twofish block cipher information.
Definition: twofish.h:17