66 lines
2.1 KiB
C++
66 lines
2.1 KiB
C++
// salsa.h - written and placed in the public domain by Wei Dai
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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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NAMESPACE_BEGIN(CryptoPP)
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//! _
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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_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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FixedSizeAlignedSecBlock<word32, 16> m_state;
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int m_rounds;
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};
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/// <a href="http://www.cryptolounge.org/wiki/Salsa20">Salsa20</a>, variable rounds: 8, 12 or 20 (default 20)
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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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//! _
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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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/// <a href="http://www.cryptolounge.org/wiki/XSalsa20">XSalsa20</a>, variable rounds: 8, 12 or 20 (default 20)
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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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