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external/crypto++-5.61/salsa.h

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+// salsa.h - written and placed in the public domain by Wei Dai
+
+#ifndef CRYPTOPP_SALSA_H
+#define CRYPTOPP_SALSA_H
+
+#include "strciphr.h"
+
+NAMESPACE_BEGIN(CryptoPP)
+
+//! _
+struct Salsa20_Info : public VariableKeyLength<32, 16, 32, 16, SimpleKeyingInterface::UNIQUE_IV, 8>
+{
+	static const char *StaticAlgorithmName() {return "Salsa20";}
+};
+
+class CRYPTOPP_NO_VTABLE Salsa20_Policy : public AdditiveCipherConcretePolicy<word32, 16>
+{
+protected:
+	void CipherSetKey(const NameValuePairs &params, const byte *key, size_t length);
+	void OperateKeystream(KeystreamOperation operation, byte *output, const byte *input, size_t iterationCount);
+	void CipherResynchronize(byte *keystreamBuffer, const byte *IV, size_t length);
+	bool CipherIsRandomAccess() const {return true;}
+	void SeekToIteration(lword iterationCount);
+#if CRYPTOPP_BOOL_X86 || CRYPTOPP_BOOL_X64
+	unsigned int GetAlignment() const;
+	unsigned int GetOptimalBlockSize() const;
+#endif
+
+	FixedSizeAlignedSecBlock<word32, 16> m_state;
+	int m_rounds;
+};
+
+/// <a href="http://www.cryptolounge.org/wiki/Salsa20">Salsa20</a>, variable rounds: 8, 12 or 20 (default 20)
+struct Salsa20 : public Salsa20_Info, public SymmetricCipherDocumentation
+{
+	typedef SymmetricCipherFinal<ConcretePolicyHolder<Salsa20_Policy, AdditiveCipherTemplate<> >, Salsa20_Info> Encryption;
+	typedef Encryption Decryption;
+};
+
+//! _
+struct XSalsa20_Info : public FixedKeyLength<32, SimpleKeyingInterface::UNIQUE_IV, 24>
+{
+	static const char *StaticAlgorithmName() {return "XSalsa20";}
+};
+
+class CRYPTOPP_NO_VTABLE XSalsa20_Policy : public Salsa20_Policy
+{
+public:
+	void CipherSetKey(const NameValuePairs &params, const byte *key, size_t length);
+	void CipherResynchronize(byte *keystreamBuffer, const byte *IV, size_t length);
+
+protected:
+	FixedSizeSecBlock<word32, 8> m_key;
+};
+
+/// <a href="http://www.cryptolounge.org/wiki/XSalsa20">XSalsa20</a>, variable rounds: 8, 12 or 20 (default 20)
+struct XSalsa20 : public XSalsa20_Info, public SymmetricCipherDocumentation
+{
+	typedef SymmetricCipherFinal<ConcretePolicyHolder<XSalsa20_Policy, AdditiveCipherTemplate<> >, XSalsa20_Info> Encryption;
+	typedef Encryption Decryption;
+};
+
+NAMESPACE_END
+
+#endif