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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 | 31 | 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 |
33 | | class CAST128 : public CAST128_Info, public BlockCipherDocumentation |
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 ¶ms); |
40 | | |
41 | | protected: |
42 | | bool reduced; |
43 | | FixedSizeSecBlock<word32, 32> K; |
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: |
62 | | typedef BlockCipherFinal<ENCRYPTION, Enc> Encryption; |
63 | | typedef BlockCipherFinal<DECRYPTION, Dec> Decryption; |
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 | 0 | 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 |
76 | | class CAST256 : public CAST256_Info, public BlockCipherDocumentation |
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 ¶ms); |
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 | | |
91 | | FixedSizeSecBlock<word32, 8*12> K; |
92 | | mutable FixedSizeSecBlock<word32, 8> kappa; |
93 | | mutable FixedSizeSecBlock<word32, 3> m_t; |
94 | | }; |
95 | | |
96 | | public: |
97 | | typedef BlockCipherFinal<ENCRYPTION, Base> Encryption; |
98 | | typedef BlockCipherFinal<DECRYPTION, Base> Decryption; |
99 | | }; |
100 | | |
101 | | typedef CAST128::Encryption CAST128Encryption; |
102 | | typedef CAST128::Decryption CAST128Decryption; |
103 | | |
104 | | typedef CAST256::Encryption CAST256Encryption; |
105 | | typedef CAST256::Decryption CAST256Decryption; |
106 | | |
107 | | NAMESPACE_END |
108 | | |
109 | | #endif |