105 lines
3.9 KiB
C++
105 lines
3.9 KiB
C++
// salsa.h - originally written and placed in the public domain by Wei Dai
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/// \file salsa.h
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/// \brief Classes for Salsa and Salsa20 stream ciphers
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#ifndef CRYPTOPP_SALSA_H
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#define CRYPTOPP_SALSA_H
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#include "strciphr.h"
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#include "secblock.h"
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// Clang 3.3 integrated assembler crash on Linux. Clang 3.4 due to compiler
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// error with .intel_syntax, http://llvm.org/bugs/show_bug.cgi?id=24232
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#if CRYPTOPP_BOOL_X32 || defined(CRYPTOPP_DISABLE_MIXED_ASM)
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# define CRYPTOPP_DISABLE_SALSA_ASM 1
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#endif
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NAMESPACE_BEGIN(CryptoPP)
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/// \brief Salsa20 core transform
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/// \param data the data to transform
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/// \param rounds the number of rounds
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/// \details Several algorithms, like CryptoBox and Scrypt, require access to
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/// the core Salsa20 transform. The current Crypto++ implementation does not
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/// lend itself to disgorging the Salsa20 cipher from the Salsa20 core transform.
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/// Instead Salsa20_Core is provided with customary accelerations.
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void Salsa20_Core(word32* data, unsigned int rounds);
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/// \brief Salsa20 stream cipher information
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/// \since Crypto++ 5.4
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struct Salsa20_Info : public VariableKeyLength<32, 16, 32, 16, SimpleKeyingInterface::UNIQUE_IV, 8>
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{
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static std::string StaticAlgorithmName() {return "Salsa20";}
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};
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/// \brief Salsa20 stream cipher operation
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/// \since Crypto++ 5.4
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class CRYPTOPP_NO_VTABLE Salsa20_Policy : public AdditiveCipherConcretePolicy<word32, 16>
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{
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protected:
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Salsa20_Policy() : m_rounds(ROUNDS) {}
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void CipherSetKey(const NameValuePairs ¶ms, const byte *key, size_t length);
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void OperateKeystream(KeystreamOperation operation, byte *output, const byte *input, size_t iterationCount);
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void CipherResynchronize(byte *keystreamBuffer, const byte *IV, size_t length);
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bool CipherIsRandomAccess() const {return true;}
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void SeekToIteration(lword iterationCount);
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#if (CRYPTOPP_BOOL_X86 || CRYPTOPP_BOOL_X32 || CRYPTOPP_BOOL_X64)
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unsigned int GetAlignment() const;
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unsigned int GetOptimalBlockSize() const;
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#endif
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std::string AlgorithmProvider() const;
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CRYPTOPP_CONSTANT(ROUNDS = 20); // Default rounds
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FixedSizeAlignedSecBlock<word32, 16> m_state;
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int m_rounds;
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};
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/// \brief Salsa20 stream cipher
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/// \details Salsa20 provides a variable number of rounds: 8, 12 or 20. The default number of rounds is 20.
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/// \sa <A HREF="https://cr.yp.to/snuffle/salsafamily-20071225.pdf">The Salsa20
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/// family of stream ciphers (20071225)</A>,
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/// <A HREF="https://cr.yp.to/snuffle.html">Snuffle 2005: the Salsa20 encryption
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/// function</A> and <A HREF="https://www.cryptopp.com/wiki/Salsa20">Salsa20</A>
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/// \since Crypto++ 5.4
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struct Salsa20 : public Salsa20_Info, public SymmetricCipherDocumentation
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{
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typedef SymmetricCipherFinal<ConcretePolicyHolder<Salsa20_Policy, AdditiveCipherTemplate<> >, Salsa20_Info> Encryption;
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typedef Encryption Decryption;
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};
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/// \brief XSalsa20 stream cipher information
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/// \since Crypto++ 5.4
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struct XSalsa20_Info : public FixedKeyLength<32, SimpleKeyingInterface::UNIQUE_IV, 24>
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{
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static std::string StaticAlgorithmName() {return "XSalsa20";}
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};
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/// \brief XSalsa20 stream cipher operation
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/// \since Crypto++ 5.4
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class CRYPTOPP_NO_VTABLE XSalsa20_Policy : public Salsa20_Policy
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{
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public:
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void CipherSetKey(const NameValuePairs ¶ms, const byte *key, size_t length);
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void CipherResynchronize(byte *keystreamBuffer, const byte *IV, size_t length);
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protected:
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FixedSizeSecBlock<word32, 8> m_key;
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};
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/// \brief XSalsa20 stream cipher
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/// \details XSalsa20 provides a variable number of rounds: 8, 12 or 20. The default number of rounds is 20.
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/// \sa <a href="http://www.cryptolounge.org/wiki/XSalsa20">XSalsa20</a>
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/// \since Crypto++ 5.4
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struct XSalsa20 : public XSalsa20_Info, public SymmetricCipherDocumentation
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{
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typedef SymmetricCipherFinal<ConcretePolicyHolder<XSalsa20_Policy, AdditiveCipherTemplate<> >, XSalsa20_Info> Encryption;
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typedef Encryption Decryption;
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};
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NAMESPACE_END
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#endif
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