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323 lines
13 KiB
C++
323 lines
13 KiB
C++
// chachapoly.h - written and placed in the public domain by Jeffrey Walton
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// RFC 8439, Section 2.8, AEAD Construction, http://tools.ietf.org/html/rfc8439
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/// \file chachapoly.h
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/// \brief IETF ChaCha20/Poly1305 AEAD scheme
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/// \details ChaCha20Poly1305 is an authenticated encryption scheme that combines
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/// ChaCha20TLS and Poly1305TLS. The scheme is defined in RFC 8439, section 2.8,
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/// AEAD_CHACHA20_POLY1305 construction, and uses the IETF versions of ChaCha20
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/// and Poly1305.
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/// \sa <A HREF="http://tools.ietf.org/html/rfc8439">RFC 8439, ChaCha20 and Poly1305
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/// for IETF Protocols</A>.
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/// \since Crypto++ 8.1
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#ifndef CRYPTOPP_CHACHA_POLY1305_H
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#define CRYPTOPP_CHACHA_POLY1305_H
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#include "cryptlib.h"
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#include "authenc.h"
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#include "chacha.h"
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#include "poly1305.h"
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NAMESPACE_BEGIN(CryptoPP)
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////////////////////////////// IETF ChaChaTLS //////////////////////////////
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/// \brief IETF ChaCha20Poly1305 cipher base implementation
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/// \details Base implementation of the AuthenticatedSymmetricCipher interface
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/// \since Crypto++ 8.1
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class ChaCha20Poly1305_Base : public AuthenticatedSymmetricCipherBase
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{
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public:
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CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName()
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{return "ChaCha20/Poly1305";}
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virtual ~ChaCha20Poly1305_Base() {}
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// AuthenticatedSymmetricCipher
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std::string AlgorithmName() const
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{return std::string("ChaCha20/Poly1305");}
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std::string AlgorithmProvider() const
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{return GetSymmetricCipher().AlgorithmProvider();}
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size_t MinKeyLength() const
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{return 32;}
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size_t MaxKeyLength() const
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{return 32;}
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size_t DefaultKeyLength() const
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{return 32;}
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size_t GetValidKeyLength(size_t n) const
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{CRYPTOPP_UNUSED(n); return 32;}
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bool IsValidKeyLength(size_t n) const
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{return n==32;}
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unsigned int OptimalDataAlignment() const
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{return GetSymmetricCipher().OptimalDataAlignment();}
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IV_Requirement IVRequirement() const
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{return UNIQUE_IV;}
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unsigned int IVSize() const
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{return 12;}
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unsigned int MinIVLength() const
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{return 12;}
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unsigned int MaxIVLength() const
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{return 12;}
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unsigned int DigestSize() const
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{return 16;}
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lword MaxHeaderLength() const
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{return LWORD_MAX;} // 2^64-1 bytes
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lword MaxMessageLength() const
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{return W64LIT(274877906880);} // 2^38-1 blocks
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lword MaxFooterLength() const
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{return 0;}
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/// \brief Encrypts and calculates a MAC in one call
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/// \param ciphertext the encryption buffer
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/// \param mac the mac buffer
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/// \param macSize the size of the MAC buffer, in bytes
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/// \param iv the iv buffer
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/// \param ivLength the size of the IV buffer, in bytes
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/// \param aad the AAD buffer
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/// \param aadLength the size of the AAD buffer, in bytes
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/// \param message the message buffer
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/// \param messageLength the size of the messagetext buffer, in bytes
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/// \details EncryptAndAuthenticate() encrypts and generates the MAC in one call. The function
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/// truncates the MAC if <tt>macSize < TagSize()</tt>.
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virtual void EncryptAndAuthenticate(byte *ciphertext, byte *mac, size_t macSize, const byte *iv, int ivLength, const byte *aad, size_t aadLength, const byte *message, size_t messageLength);
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/// \brief Decrypts and verifies a MAC in one call
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/// \param message the decryption buffer
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/// \param mac the mac buffer
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/// \param macSize the size of the MAC buffer, in bytes
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/// \param iv the iv buffer
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/// \param ivLength the size of the IV buffer, in bytes
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/// \param aad the AAD buffer
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/// \param aadLength the size of the AAD buffer, in bytes
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/// \param ciphertext the cipher buffer
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/// \param ciphertextLength the size of the ciphertext buffer, in bytes
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/// \return true if the MAC is valid and the decoding succeeded, false otherwise
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/// \details DecryptAndVerify() decrypts and verifies the MAC in one call.
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/// <tt>message</tt> is a decryption buffer and should be at least as large as the ciphertext buffer.
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/// \details The function returns true iff MAC is valid. DecryptAndVerify() assumes the MAC
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/// is truncated if <tt>macLength < TagSize()</tt>.
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virtual bool DecryptAndVerify(byte *message, const byte *mac, size_t macSize, const byte *iv, int ivLength, const byte *aad, size_t aadLength, const byte *ciphertext, size_t ciphertextLength);
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protected:
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// AuthenticatedSymmetricCipherBase
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bool AuthenticationIsOnPlaintext() const {return false;}
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unsigned int AuthenticationBlockSize() const {return 1;}
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void SetKeyWithoutResync(const byte *userKey, size_t keylength, const NameValuePairs ¶ms);
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void Resync(const byte *iv, size_t len);
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size_t AuthenticateBlocks(const byte *data, size_t len);
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void AuthenticateLastHeaderBlock();
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void AuthenticateLastConfidentialBlock();
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void AuthenticateLastFooterBlock(byte *mac, size_t macSize);
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// See comments in chachapoly.cpp
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void RekeyCipherAndMac(const byte *userKey, size_t userKeyLength, const NameValuePairs ¶ms);
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virtual const MessageAuthenticationCode & GetMAC() const = 0;
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virtual MessageAuthenticationCode & AccessMAC() = 0;
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private:
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SecByteBlock m_userKey;
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};
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/// \brief IETF ChaCha20Poly1305 cipher final implementation
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/// \tparam T_IsEncryption flag indicating cipher direction
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/// \details ChaCha20Poly1305 is an authenticated encryption scheme that combines
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/// ChaCha20TLS and Poly1305TLS. The scheme is defined in RFC 8439, section 2.8,
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/// AEAD_CHACHA20_POLY1305 construction, and uses the IETF versions of ChaCha20
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/// and Poly1305.
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/// \sa <A HREF="http://tools.ietf.org/html/rfc8439">RFC 8439, ChaCha20 and Poly1305
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/// for IETF Protocols</A>.
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/// \since Crypto++ 8.1
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template <bool T_IsEncryption>
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class ChaCha20Poly1305_Final : public ChaCha20Poly1305_Base
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{
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public:
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virtual ~ChaCha20Poly1305_Final() {}
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protected:
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const SymmetricCipher & GetSymmetricCipher()
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{return const_cast<ChaCha20Poly1305_Final *>(this)->AccessSymmetricCipher();}
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SymmetricCipher & AccessSymmetricCipher()
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{return m_cipher;}
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bool IsForwardTransformation() const
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{return T_IsEncryption;}
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const MessageAuthenticationCode & GetMAC() const
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{return const_cast<ChaCha20Poly1305_Final *>(this)->AccessMAC();}
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MessageAuthenticationCode & AccessMAC()
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{return m_mac;}
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private:
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ChaChaTLS::Encryption m_cipher;
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Poly1305TLS m_mac;
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};
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/// \brief IETF ChaCha20/Poly1305 AEAD scheme
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/// \details ChaCha20Poly1305 is an authenticated encryption scheme that combines
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/// ChaCha20TLS and Poly1305TLS. The scheme is defined in RFC 8439, section 2.8,
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/// AEAD_CHACHA20_POLY1305 construction, and uses the IETF versions of ChaCha20
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/// and Poly1305.
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/// \sa <A HREF="http://tools.ietf.org/html/rfc8439">RFC 8439, ChaCha20 and Poly1305
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/// for IETF Protocols</A>.
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/// \since Crypto++ 8.1
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struct ChaCha20Poly1305 : public AuthenticatedSymmetricCipherDocumentation
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{
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/// \brief ChaCha20Poly1305 encryption
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typedef ChaCha20Poly1305_Final<true> Encryption;
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/// \brief ChaCha20Poly1305 decryption
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typedef ChaCha20Poly1305_Final<false> Decryption;
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};
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////////////////////////////// IETF XChaCha20 draft //////////////////////////////
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/// \brief IETF XChaCha20Poly1305 cipher base implementation
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/// \details Base implementation of the AuthenticatedSymmetricCipher interface
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/// \since Crypto++ 8.1
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class XChaCha20Poly1305_Base : public AuthenticatedSymmetricCipherBase
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{
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public:
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CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName()
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{return "XChaCha20/Poly1305";}
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virtual ~XChaCha20Poly1305_Base() {}
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// AuthenticatedSymmetricCipher
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std::string AlgorithmName() const
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{return std::string("XChaCha20/Poly1305");}
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std::string AlgorithmProvider() const
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{return GetSymmetricCipher().AlgorithmProvider();}
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size_t MinKeyLength() const
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{return 32;}
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size_t MaxKeyLength() const
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{return 32;}
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size_t DefaultKeyLength() const
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{return 32;}
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size_t GetValidKeyLength(size_t n) const
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{CRYPTOPP_UNUSED(n); return 32;}
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bool IsValidKeyLength(size_t n) const
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{return n==32;}
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unsigned int OptimalDataAlignment() const
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{return GetSymmetricCipher().OptimalDataAlignment();}
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IV_Requirement IVRequirement() const
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{return UNIQUE_IV;}
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unsigned int IVSize() const
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{return 24;}
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unsigned int MinIVLength() const
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{return 24;}
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unsigned int MaxIVLength() const
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{return 24;}
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unsigned int DigestSize() const
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{return 16;}
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lword MaxHeaderLength() const
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{return LWORD_MAX;} // 2^64-1 bytes
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lword MaxMessageLength() const
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{return W64LIT(274877906880);} // 2^38-1 blocks
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lword MaxFooterLength() const
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{return 0;}
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/// \brief Encrypts and calculates a MAC in one call
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/// \param ciphertext the encryption buffer
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/// \param mac the mac buffer
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/// \param macSize the size of the MAC buffer, in bytes
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/// \param iv the iv buffer
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/// \param ivLength the size of the IV buffer, in bytes
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/// \param aad the AAD buffer
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/// \param aadLength the size of the AAD buffer, in bytes
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/// \param message the message buffer
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/// \param messageLength the size of the messagetext buffer, in bytes
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/// \details EncryptAndAuthenticate() encrypts and generates the MAC in one call. The function
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/// truncates the MAC if <tt>macSize < TagSize()</tt>.
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virtual void EncryptAndAuthenticate(byte *ciphertext, byte *mac, size_t macSize, const byte *iv, int ivLength, const byte *aad, size_t aadLength, const byte *message, size_t messageLength);
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/// \brief Decrypts and verifies a MAC in one call
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/// \param message the decryption buffer
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/// \param mac the mac buffer
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/// \param macSize the size of the MAC buffer, in bytes
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/// \param iv the iv buffer
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/// \param ivLength the size of the IV buffer, in bytes
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/// \param aad the AAD buffer
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/// \param aadLength the size of the AAD buffer, in bytes
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/// \param ciphertext the cipher buffer
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/// \param ciphertextLength the size of the ciphertext buffer, in bytes
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/// \return true if the MAC is valid and the decoding succeeded, false otherwise
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/// \details DecryptAndVerify() decrypts and verifies the MAC in one call.
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/// <tt>message</tt> is a decryption buffer and should be at least as large as the ciphertext buffer.
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/// \details The function returns true iff MAC is valid. DecryptAndVerify() assumes the MAC
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/// is truncated if <tt>macLength < TagSize()</tt>.
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virtual bool DecryptAndVerify(byte *message, const byte *mac, size_t macSize, const byte *iv, int ivLength, const byte *aad, size_t aadLength, const byte *ciphertext, size_t ciphertextLength);
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protected:
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// AuthenticatedSymmetricCipherBase
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bool AuthenticationIsOnPlaintext() const {return false;}
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unsigned int AuthenticationBlockSize() const {return 1;}
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void SetKeyWithoutResync(const byte *userKey, size_t keylength, const NameValuePairs ¶ms);
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void Resync(const byte *iv, size_t len);
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size_t AuthenticateBlocks(const byte *data, size_t len);
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void AuthenticateLastHeaderBlock();
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void AuthenticateLastConfidentialBlock();
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void AuthenticateLastFooterBlock(byte *mac, size_t macSize);
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// See comments in chachapoly.cpp
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void RekeyCipherAndMac(const byte *userKey, size_t userKeyLength, const NameValuePairs ¶ms);
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virtual const MessageAuthenticationCode & GetMAC() const = 0;
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virtual MessageAuthenticationCode & AccessMAC() = 0;
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private:
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SecByteBlock m_userKey;
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};
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/// \brief IETF XChaCha20Poly1305 cipher final implementation
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/// \tparam T_IsEncryption flag indicating cipher direction
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/// \details XChaCha20Poly1305 is an authenticated encryption scheme that combines
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/// XChaCha20 and Poly1305-TLS. The scheme is defined in RFC 8439, section 2.8,
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/// AEAD_CHACHA20_POLY1305 construction, and uses the IETF versions of ChaCha20
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/// and Poly1305.
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/// \sa <A HREF="http://tools.ietf.org/html/rfc8439">RFC 8439, ChaCha20 and Poly1305
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/// for IETF Protocols</A>.
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/// \since Crypto++ 8.1
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template <bool T_IsEncryption>
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class XChaCha20Poly1305_Final : public XChaCha20Poly1305_Base
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{
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public:
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virtual ~XChaCha20Poly1305_Final() {}
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protected:
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const SymmetricCipher & GetSymmetricCipher()
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{return const_cast<XChaCha20Poly1305_Final *>(this)->AccessSymmetricCipher();}
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SymmetricCipher & AccessSymmetricCipher()
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{return m_cipher;}
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bool IsForwardTransformation() const
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{return T_IsEncryption;}
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const MessageAuthenticationCode & GetMAC() const
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{return const_cast<XChaCha20Poly1305_Final *>(this)->AccessMAC();}
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MessageAuthenticationCode & AccessMAC()
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{return m_mac;}
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private:
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XChaCha20::Encryption m_cipher;
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Poly1305TLS m_mac;
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};
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/// \brief IETF XChaCha20/Poly1305 AEAD scheme
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/// \details XChaCha20Poly1305 is an authenticated encryption scheme that combines
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/// XChaCha20 and Poly1305-TLS. The scheme is defined in RFC 8439, section 2.8,
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/// AEAD_XCHACHA20_POLY1305 construction, and uses the IETF versions of ChaCha20
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/// and Poly1305.
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/// \sa <A HREF="http://tools.ietf.org/html/rfc8439">RFC 8439, ChaCha20 and Poly1305
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/// for IETF Protocols</A>.
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/// \since Crypto++ 8.1
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struct XChaCha20Poly1305 : public AuthenticatedSymmetricCipherDocumentation
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{
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/// \brief XChaCha20Poly1305 encryption
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typedef XChaCha20Poly1305_Final<true> Encryption;
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/// \brief XChaCha20Poly1305 decryption
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typedef XChaCha20Poly1305_Final<false> Decryption;
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};
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NAMESPACE_END
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#endif // CRYPTOPP_CHACHA_POLY1305_H
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