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https://github.com/shadps4-emu/ext-cryptopp.git
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85 lines
3.1 KiB
C++
85 lines
3.1 KiB
C++
// salsa.h - 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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// TODO: work around GCC 4.8+ issue with SSE2 ASM until the exact details are known
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// and fix is released. Duplicate with "valgrind ./cryptest.exe tv salsa"
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// "Inline assembly operands don't work with .intel_syntax", http://llvm.org/bugs/show_bug.cgi?id=24232
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#if CRYPTOPP_BOOL_X32 || defined(CRYPTOPP_DISABLE_INTEL_ASM) || (CRYPTOPP_GCC_VERSION >= 40800)
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# define CRYPTOPP_DISABLE_SALSA_ASM
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#endif
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NAMESPACE_BEGIN(CryptoPP)
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//! \class Salsa20_Info
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//! \brief Salsa stream cipher information
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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 const char *StaticAlgorithmName() {return "Salsa20";}
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};
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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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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) && !defined(CRYPTOPP_DISABLE_SALSA_ASM)
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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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FixedSizeAlignedSecBlock<word32, 16> m_state;
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int m_rounds;
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};
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//! \class Salsa20
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//! \brief Salsa20 stream cipher information
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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="http://www.cryptolounge.org/wiki/XSalsa20">XSalsa20</a>
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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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//! \class XSalsa20_Info
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//! \brief XSalsa20 stream cipher information
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struct XSalsa20_Info : public FixedKeyLength<32, SimpleKeyingInterface::UNIQUE_IV, 24>
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{
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static const char *StaticAlgorithmName() {return "XSalsa20";}
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};
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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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//! \class XSalsa20
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//! \brief XSalsa20 stream cipher information
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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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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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