110 lines
3.2 KiB
C++
110 lines
3.2 KiB
C++
// cast.h - originally written and placed in the public domain by Wei Dai
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/// \file cast.h
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/// \brief Classes for the CAST-128 and CAST-256 block ciphers
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/// \since Crypto++ 2.2
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#ifndef CRYPTOPP_CAST_H
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#define CRYPTOPP_CAST_H
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#include "seckey.h"
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#include "secblock.h"
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NAMESPACE_BEGIN(CryptoPP)
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/// \brief CAST block cipher base
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/// \since Crypto++ 2.2
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class CAST
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{
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protected:
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static const word32 S[8][256];
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};
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/// \brief CAST128 block cipher information
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/// \since Crypto++ 2.2
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struct CAST128_Info : public FixedBlockSize<8>, public VariableKeyLength<16, 5, 16>
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{
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CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() {return "CAST-128";}
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};
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/// \brief CAST128 block cipher
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/// \sa <a href="http://www.cryptopp.com/wiki/CAST-128">CAST-128</a>
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/// \since Crypto++ 2.2
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class CAST128 : public CAST128_Info, public BlockCipherDocumentation
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{
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/// \brief CAST128 block cipher default operation
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class CRYPTOPP_NO_VTABLE Base : public CAST, public BlockCipherImpl<CAST128_Info>
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{
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public:
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void UncheckedSetKey(const byte *userKey, unsigned int length, const NameValuePairs ¶ms);
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protected:
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bool reduced;
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FixedSizeSecBlock<word32, 32> K;
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mutable FixedSizeSecBlock<word32, 3> m_t;
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};
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/// \brief CAST128 block cipher encryption operation
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class CRYPTOPP_NO_VTABLE Enc : public Base
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{
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public:
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void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
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};
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/// \brief CAST128 block cipher decryption operation
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class CRYPTOPP_NO_VTABLE Dec : public Base
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{
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public:
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void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
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};
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public:
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typedef BlockCipherFinal<ENCRYPTION, Enc> Encryption;
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typedef BlockCipherFinal<DECRYPTION, Dec> Decryption;
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};
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/// \brief CAST256 block cipher information
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/// \since Crypto++ 4.0
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struct CAST256_Info : public FixedBlockSize<16>, public VariableKeyLength<16, 16, 32, 4>
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{
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CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() {return "CAST-256";}
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};
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/// \brief CAST256 block cipher
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/// \sa <a href="http://www.cryptopp.com/wiki/CAST-256">CAST-256</a>
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/// \since Crypto++ 4.0
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class CAST256 : public CAST256_Info, public BlockCipherDocumentation
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{
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/// \brief CAST256 block cipher default operation
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class CRYPTOPP_NO_VTABLE Base : public CAST, public BlockCipherImpl<CAST256_Info>
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{
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public:
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void UncheckedSetKey(const byte *userKey, unsigned int length, const NameValuePairs ¶ms);
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void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
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protected:
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static const word32 t_m[8][24];
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static const unsigned int t_r[8][24];
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static void Omega(int i, word32 kappa[8]);
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FixedSizeSecBlock<word32, 8*12> K;
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mutable FixedSizeSecBlock<word32, 8> kappa;
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mutable FixedSizeSecBlock<word32, 3> m_t;
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};
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public:
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typedef BlockCipherFinal<ENCRYPTION, Base> Encryption;
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typedef BlockCipherFinal<DECRYPTION, Base> Decryption;
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};
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typedef CAST128::Encryption CAST128Encryption;
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typedef CAST128::Decryption CAST128Decryption;
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typedef CAST256::Encryption CAST256Encryption;
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typedef CAST256::Decryption CAST256Decryption;
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NAMESPACE_END
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#endif
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