Crypto++  8.2
Free C++ class library of cryptographic schemes
cast.h
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1 // cast.h - originally written and placed in the public domain by Wei Dai
2 
3 /// \file cast.h
4 /// \brief Classes for the CAST-128 and CAST-256 block ciphers
5 /// \since Crypto++ 2.2
6 
7 #ifndef CRYPTOPP_CAST_H
8 #define CRYPTOPP_CAST_H
9 
10 #include "seckey.h"
11 #include "secblock.h"
12 
13 NAMESPACE_BEGIN(CryptoPP)
14 
15 /// \brief CAST block cipher base
16 /// \since Crypto++ 2.2
17 class CAST
18 {
19 protected:
20  static const word32 S[8][256];
21 };
22 
23 /// \brief CAST128 block cipher information
24 /// \since Crypto++ 2.2
25 struct CAST128_Info : public FixedBlockSize<8>, public VariableKeyLength<16, 5, 16>
26 {
27  CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() {return "CAST-128";}
28 };
29 
30 /// \brief CAST128 block cipher
31 /// \sa <a href="http://www.cryptopp.com/wiki/CAST-128">CAST-128</a>
32 /// \since Crypto++ 2.2
34 {
35  /// \brief CAST128 block cipher default operation
36  class CRYPTOPP_NO_VTABLE Base : public CAST, public BlockCipherImpl<CAST128_Info>
37  {
38  public:
39  void UncheckedSetKey(const byte *userKey, unsigned int length, const NameValuePairs &params);
40 
41  protected:
42  bool reduced;
44  mutable FixedSizeSecBlock<word32, 3> m_t;
45  };
46 
47  /// \brief CAST128 block cipher encryption operation
48  class CRYPTOPP_NO_VTABLE Enc : public Base
49  {
50  public:
51  void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
52  };
53 
54  /// \brief CAST128 block cipher decryption operation
55  class CRYPTOPP_NO_VTABLE Dec : public Base
56  {
57  public:
58  void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
59  };
60 
61 public:
64 };
65 
66 /// \brief CAST256 block cipher information
67 /// \since Crypto++ 4.0
68 struct CAST256_Info : public FixedBlockSize<16>, public VariableKeyLength<16, 16, 32, 4>
69 {
70  CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() {return "CAST-256";}
71 };
72 
73 /// \brief CAST256 block cipher
74 /// \sa <a href="http://www.cryptopp.com/wiki/CAST-256">CAST-256</a>
75 /// \since Crypto++ 4.0
77 {
78  /// \brief CAST256 block cipher default operation
79  class CRYPTOPP_NO_VTABLE Base : public CAST, public BlockCipherImpl<CAST256_Info>
80  {
81  public:
82  void UncheckedSetKey(const byte *userKey, unsigned int length, const NameValuePairs &params);
83  void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
84 
85  protected:
86  static const word32 t_m[8][24];
87  static const unsigned int t_r[8][24];
88 
89  static void Omega(int i, word32 kappa[8]);
90 
92  mutable FixedSizeSecBlock<word32, 8> kappa;
93  mutable FixedSizeSecBlock<word32, 3> m_t;
94  };
95 
96 public:
99 };
100 
103 
106 
107 NAMESPACE_END
108 
109 #endif
Provides Encryption and Decryption typedefs used by derived classes to implement a block cipher.
Definition: seckey.h:398
Classes and functions for secure memory allocations.
CAST128 block cipher.
Definition: cast.h:33
Inherited by algorithms with fixed block size.
Definition: seckey.h:40
CAST256 block cipher.
Definition: cast.h:76
Classes and functions for implementing secret key algorithms.
CAST block cipher base.
Definition: cast.h:17
Inherited by keyed algorithms with variable key length.
Definition: seckey.h:165
CAST256 block cipher information.
Definition: cast.h:68
Provides a base implementation of Algorithm and SimpleKeyingInterface for block ciphers.
Definition: seckey.h:305
Crypto++ library namespace.
CAST128 block cipher information.
Definition: cast.h:25
Interface for retrieving values given their names.
Definition: cryptlib.h:321