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