Remove cryptoppwin submodule (#754)

third_party/cryptoppwin/include/cryptopp/chacha.h

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+// chacha.h - written and placed in the public domain by Jeffrey Walton.
+//            Based on Wei Dai's Salsa20, Botan's SSE2 implementation,
+//            and Bernstein's reference ChaCha family implementation at
+//            http://cr.yp.to/chacha.html.
+
+// The library added Bernstein's ChaCha classes at Crypto++ 5.6.4. The IETF
+// uses a slightly different implementation than Bernstein, and the IETF
+// ChaCha and XChaCha classes were added at Crypto++ 8.1. We wanted to maintain
+// ABI compatibility at the 8.1 release so the original ChaCha classes were not
+// disturbed. Instead new classes were added for IETF ChaCha. The back-end
+// implementation shares code as expected, however.
+
+/// \file chacha.h
+/// \brief Classes for ChaCha8, ChaCha12 and ChaCha20 stream ciphers
+/// \details Crypto++ provides Bernstein and ECRYPT's ChaCha from <a
+///  href="http://cr.yp.to/chacha/chacha-20080128.pdf">ChaCha, a
+///  variant of Salsa20</a> (2008.01.28). Crypto++ also provides the
+///  IETF implementation of ChaCha using the ChaChaTLS name. Bernstein's
+///  implementation is _slightly_ different from the TLS working group's
+///  implementation for cipher suites
+///  <tt>TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256</tt>,
+///  <tt>TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256</tt>,
+///  and <tt>TLS_DHE_RSA_WITH_CHACHA20_POLY1305_SHA256</tt>. Finally,
+///  the library provides <a
+///  href="https://tools.ietf.org/html/draft-arciszewski-xchacha">XChaCha:
+///  eXtended-nonce ChaCha and AEAD_XChaCha20_Poly1305 (rev. 03)</a>.
+/// \since ChaCha since Crypto++ 5.6.4, ChaChaTLS and XChaCha20 since Crypto++ 8.1
+
+#ifndef CRYPTOPP_CHACHA_H
+#define CRYPTOPP_CHACHA_H
+
+#include "strciphr.h"
+#include "secblock.h"
+
+NAMESPACE_BEGIN(CryptoPP)
+
+////////////////////////////// Bernstein ChaCha //////////////////////////////
+
+/// \brief ChaCha stream cipher information
+/// \since Crypto++ 5.6.4
+struct ChaCha_Info : public VariableKeyLength<32, 16, 32, 16, SimpleKeyingInterface::UNIQUE_IV, 8>
+{
+    /// \brief The algorithm name
+    /// \return the algorithm name
+    /// \details StaticAlgorithmName returns the algorithm's name as a static
+    ///  member function.
+    /// \details Bernstein named the cipher variants ChaCha8, ChaCha12 and
+    ///  ChaCha20. More generally, Bernstein called the family ChaCha{r}.
+    ///  AlgorithmName() provides the exact name once rounds are set.
+    static const char* StaticAlgorithmName() {
+        return "ChaCha";
+    }
+};
+
+/// \brief ChaCha stream cipher implementation
+/// \since Crypto++ 5.6.4
+class CRYPTOPP_NO_VTABLE ChaCha_Policy : public AdditiveCipherConcretePolicy<word32, 16>
+{
+public:
+    virtual ~ChaCha_Policy() {}
+    ChaCha_Policy() : m_rounds(ROUNDS) {}
+
+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);
+    unsigned int GetAlignment() const;
+    unsigned int GetOptimalBlockSize() const;
+
+    std::string AlgorithmName() const;
+    std::string AlgorithmProvider() const;
+
+    CRYPTOPP_CONSTANT(ROUNDS = 20);  // Default rounds
+    FixedSizeAlignedSecBlock<word32, 16> m_state;
+    unsigned int m_rounds;
+};
+
+/// \brief ChaCha stream cipher
+/// \details This is Bernstein and ECRYPT's ChaCha. It is _slightly_ different
+///  from the IETF's version of ChaCha called ChaChaTLS.
+/// \sa <a href="http://cr.yp.to/chacha/chacha-20080208.pdf">ChaCha, a variant
+///  of Salsa20</a> (2008.01.28).
+/// \since Crypto++ 5.6.4
+struct ChaCha : public ChaCha_Info, public SymmetricCipherDocumentation
+{
+    /// \brief ChaCha Encryption
+    typedef SymmetricCipherFinal<ConcretePolicyHolder<ChaCha_Policy, AdditiveCipherTemplate<> >, ChaCha_Info > Encryption;
+    /// \brief ChaCha Decryption
+    typedef Encryption Decryption;
+};
+
+////////////////////////////// IETF ChaChaTLS //////////////////////////////
+
+/// \brief IETF ChaCha20 stream cipher information
+/// \since Crypto++ 8.1
+struct ChaChaTLS_Info : public FixedKeyLength<32, SimpleKeyingInterface::UNIQUE_IV, 12>, FixedRounds<20>
+{
+    /// \brief The algorithm name
+    /// \return the algorithm name
+    /// \details StaticAlgorithmName returns the algorithm's name as a static
+    ///  member function.
+    /// \details This is the IETF's variant of Bernstein's ChaCha from RFC
+    ///  8439. IETF ChaCha is called ChaChaTLS in the Crypto++ library. It
+    ///  is _slightly_ different from Bernstein's implementation.
+    static const char* StaticAlgorithmName() {
+        return "ChaChaTLS";
+    }
+};
+
+/// \brief IETF ChaCha20 stream cipher implementation
+/// \since Crypto++ 8.1
+class CRYPTOPP_NO_VTABLE ChaChaTLS_Policy : public AdditiveCipherConcretePolicy<word32, 16>
+{
+public:
+    virtual ~ChaChaTLS_Policy() {}
+    ChaChaTLS_Policy() : m_counter(0) {}
+
+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);
+    unsigned int GetAlignment() const;
+    unsigned int GetOptimalBlockSize() const;
+
+    std::string AlgorithmName() const;
+    std::string AlgorithmProvider() const;
+
+    FixedSizeAlignedSecBlock<word32, 16+8> m_state;
+    unsigned int m_counter;
+    CRYPTOPP_CONSTANT(ROUNDS = ChaChaTLS_Info::ROUNDS);
+    CRYPTOPP_CONSTANT(KEY = 16);  // Index into m_state
+    CRYPTOPP_CONSTANT(CTR = 24);  // Index into m_state
+};
+
+/// \brief IETF ChaCha20 stream cipher
+/// \details This is the IETF's variant of Bernstein's ChaCha from RFC 8439.
+///  IETF ChaCha is called ChaChaTLS in the Crypto++ library. It is
+///  _slightly_ different from the Bernstein implementation. ChaCha-TLS
+///  can be used for cipher suites
+///  <tt>TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256</tt>,
+///  <tt>TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256</tt>, and
+///  <tt>TLS_DHE_RSA_WITH_CHACHA20_POLY1305_SHA256</tt>.
+/// \sa <a href="https://tools.ietf.org/html/rfc8439">RFC 8439, ChaCha20 and
+///  Poly1305 for IETF Protocols</a>, <A
+///  HREF="https://mailarchive.ietf.org/arch/msg/cfrg/gsOnTJzcbgG6OqD8Sc0GO5aR_tU">How
+///  to handle block counter wrap in IETF's ChaCha algorithm?</A> and
+///  <A HREF="https://github.com/weidai11/cryptopp/issues/790">Issue
+///  790, ChaChaTLS results when counter block wraps</A>.
+/// \since Crypto++ 8.1
+struct ChaChaTLS : public ChaChaTLS_Info, public SymmetricCipherDocumentation
+{
+    /// \brief ChaCha-TLS Encryption
+    typedef SymmetricCipherFinal<ConcretePolicyHolder<ChaChaTLS_Policy, AdditiveCipherTemplate<> >, ChaChaTLS_Info > Encryption;
+    /// \brief ChaCha-TLS Decryption
+    typedef Encryption Decryption;
+};
+
+////////////////////////////// IETF XChaCha20 draft //////////////////////////////
+
+/// \brief IETF XChaCha20 stream cipher information
+/// \since Crypto++ 8.1
+struct XChaCha20_Info : public FixedKeyLength<32, SimpleKeyingInterface::UNIQUE_IV, 24>
+{
+    /// \brief The algorithm name
+    /// \return the algorithm name
+    /// \details StaticAlgorithmName returns the algorithm's name as a static
+    ///  member function.
+    /// \details This is the IETF's XChaCha from draft-arciszewski-xchacha.
+    static const char* StaticAlgorithmName() {
+        return "XChaCha20";
+    }
+};
+
+/// \brief IETF XChaCha20 stream cipher implementation
+/// \since Crypto++ 8.1
+class CRYPTOPP_NO_VTABLE XChaCha20_Policy : public AdditiveCipherConcretePolicy<word32, 16>
+{
+public:
+    virtual ~XChaCha20_Policy() {}
+    XChaCha20_Policy() : m_counter(0), m_rounds(ROUNDS) {}
+
+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 false;}
+    void SeekToIteration(lword iterationCount);
+    unsigned int GetAlignment() const;
+    unsigned int GetOptimalBlockSize() const;
+
+    std::string AlgorithmName() const;
+    std::string AlgorithmProvider() const;
+
+    FixedSizeAlignedSecBlock<word32, 16+8> m_state;
+    unsigned int m_counter, m_rounds;
+    CRYPTOPP_CONSTANT(ROUNDS = 20);  // Default rounds
+    CRYPTOPP_CONSTANT(KEY = 16);  // Index into m_state
+};
+
+/// \brief IETF XChaCha20 stream cipher
+/// \details This is the IETF's XChaCha from draft-arciszewski-xchacha.
+/// \sa <a href="https://tools.ietf.org/html/draft-arciszewski-xchacha">XChaCha:
+///  eXtended-nonce ChaCha and AEAD_XChaCha20_Poly1305 (rev. 03)</a>, <A
+///  HREF="https://mailarchive.ietf.org/arch/msg/cfrg/gsOnTJzcbgG6OqD8Sc0GO5aR_tU">How
+///  to handle block counter wrap in IETF's ChaCha algorithm?</A> and
+///  <A HREF="https://github.com/weidai11/cryptopp/issues/790">Issue
+///  790, ChaCha20 results when counter block wraps</A>.
+/// \since Crypto++ 8.1
+struct XChaCha20 : public XChaCha20_Info, public SymmetricCipherDocumentation
+{
+    /// \brief XChaCha Encryption
+    typedef SymmetricCipherFinal<ConcretePolicyHolder<XChaCha20_Policy, AdditiveCipherTemplate<> >, XChaCha20_Info > Encryption;
+    /// \brief XChaCha Decryption
+    typedef Encryption Decryption;
+};
+
+NAMESPACE_END
+
+#endif  // CRYPTOPP_CHACHA_H