1 files changed, 84 insertions, 0 deletions
diff --git a/external/crypto++-5.6.3/salsa.h b/external/crypto++-5.6.3/salsa.h
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+++ b/external/crypto++-5.6.3/salsa.h
@@ -0,0 +1,84 @@
+// salsa.h - written and placed in the public domain by Wei Dai
+
+//! \file salsa.h
+//! \brief Classes for Salsa and Salsa20 stream ciphers
+
+#ifndef CRYPTOPP_SALSA_H
+#define CRYPTOPP_SALSA_H
+
+#include "strciphr.h"
+#include "secblock.h"
+
+// TODO: work around GCC 4.8+ issue with SSE2 ASM until the exact details are known
+//   and fix is released. Duplicate with "valgrind ./cryptest.exe tv salsa"
+// "Inline assembly operands don't work with .intel_syntax", http://llvm.org/bugs/show_bug.cgi?id=24232
+#if CRYPTOPP_BOOL_X32 || defined(CRYPTOPP_DISABLE_INTEL_ASM) || (CRYPTOPP_GCC_VERSION >= 40800)
+# define CRYPTOPP_DISABLE_SALSA_ASM
+#endif
+
+NAMESPACE_BEGIN(CryptoPP)
+
+//! \class Salsa20_Info
+//! \brief Salsa block cipher information
+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_X32 || CRYPTOPP_BOOL_X64) && !defined(CRYPTOPP_DISABLE_SALSA_ASM)
+	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)
+//! \class Salsa20
+//! \brief Salsa20 block cipher information
+//! \details Salsa20 provides a variable number of rounds: 8, 12 or 20. The default number of rounds is 20.
+struct Salsa20 : public Salsa20_Info, public SymmetricCipherDocumentation
+{
+	typedef SymmetricCipherFinal<ConcretePolicyHolder<Salsa20_Policy, AdditiveCipherTemplate<> >, Salsa20_Info> Encryption;
+	typedef Encryption Decryption;
+};
+
+//! \class XSalsa20_Info
+//! \brief XSalsa20 block cipher information
+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)
+//! \class XSalsa20
+//! \brief XSalsa20 block cipher information
+//! \details XSalsa20 provides a variable number of rounds: 8, 12 or 20. The default number of rounds is 20.
+struct XSalsa20 : public XSalsa20_Info, public SymmetricCipherDocumentation
+{
+	typedef SymmetricCipherFinal<ConcretePolicyHolder<XSalsa20_Policy, AdditiveCipherTemplate<> >, XSalsa20_Info> Encryption;
+	typedef Encryption Decryption;
+};
+
+NAMESPACE_END
+
+#endif