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162 lines
5.0 KiB
162 lines
5.0 KiB
![]()
4 years ago
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// tea.h - originally written and placed in the public domain by Wei Dai
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/// \file tea.h
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/// \brief Classes for the TEA, BTEA and XTEA block ciphers
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#ifndef CRYPTOPP_TEA_H
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#define CRYPTOPP_TEA_H
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#include "seckey.h"
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#include "secblock.h"
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#include "misc.h"
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NAMESPACE_BEGIN(CryptoPP)
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/// \brief TEA block cipher information
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struct TEA_Info : public FixedBlockSize<8>, public FixedKeyLength<16>, public VariableRounds<32>
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{
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/// \brief The algorithm name
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/// \returns the algorithm name
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/// \details StaticAlgorithmName returns the algorithm's name as a static
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/// member function.
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CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() {return "TEA";}
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};
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/// \brief TEA block cipher
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/// \sa <a href="http://www.cryptopp.com/wiki/TEA">TEA</a>
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class TEA : public TEA_Info, public BlockCipherDocumentation
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{
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/// \brief TEA block cipher default operation
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class CRYPTOPP_NO_VTABLE Base : public BlockCipherImpl<TEA_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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FixedSizeSecBlock<word32, 4> m_k;
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word32 m_limit;
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};
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/// \brief TEA 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 TEA 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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typedef TEA::Encryption TEAEncryption;
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typedef TEA::Decryption TEADecryption;
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/// \brief XTEA block cipher information
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struct XTEA_Info : public FixedBlockSize<8>, public FixedKeyLength<16>, public VariableRounds<32>
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{
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/// \brief The algorithm name
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/// \returns the algorithm name
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/// \details StaticAlgorithmName returns the algorithm's name as a static
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/// member function.
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CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() {return "XTEA";}
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};
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/// \brief XTEA block cipher
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/// \sa <a href="http://www.cryptopp.com/wiki/TEA">XTEA</a>
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class XTEA : public XTEA_Info, public BlockCipherDocumentation
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{
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/// \brief XTEA block cipher default operation
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class CRYPTOPP_NO_VTABLE Base : public BlockCipherImpl<XTEA_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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FixedSizeSecBlock<word32, 4> m_k;
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word32 m_limit;
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};
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/// \brief XTEA 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 XTEA 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 BTEA block cipher information
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struct BTEA_Info : public FixedKeyLength<16>
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{
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/// \brief The algorithm name
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/// \returns the algorithm name
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/// \details StaticAlgorithmName returns the algorithm's name as a static
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/// member function.
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CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() {return "BTEA";}
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};
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/// \brief BTEA block cipher
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/// \details Corrected Block TEA as described in "xxtea". This class hasn't been tested yet.
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/// \sa <A HREF="http://www.movable-type.co.uk/scripts/xxtea.pdf">Correction to xtea</A> and
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/// <a href="http://www.cryptopp.com/wiki/TEA">Corrected Block TEA</a>.
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class BTEA : public BTEA_Info, public BlockCipherDocumentation
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{
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/// \brief BTEA block cipher default operation
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class CRYPTOPP_NO_VTABLE Base : public AlgorithmImpl<SimpleKeyingInterfaceImpl<BlockCipher, BTEA_Info>, BTEA_Info>
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{
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public:
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void UncheckedSetKey(const byte *key, unsigned int length, const NameValuePairs ¶ms)
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{
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CRYPTOPP_UNUSED(length), CRYPTOPP_UNUSED(params);
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m_blockSize = params.GetIntValueWithDefault("BlockSize", 60*4);
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GetUserKey(BIG_ENDIAN_ORDER, m_k.begin(), 4, key, KEYLENGTH);
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}
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unsigned int BlockSize() const {return m_blockSize;}
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protected:
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FixedSizeSecBlock<word32, 4> m_k;
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unsigned int m_blockSize;
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};
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/// \brief BTEA 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 BTEA 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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NAMESPACE_END
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#endif
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