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179 lines
7.9 KiB
C++
179 lines
7.9 KiB
C++
// donna.h - written and placed in public domain by Jeffrey Walton
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// Crypto++ specific implementation wrapped around Andrew
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// Moon's public domain curve25519-donna and ed25519-donna,
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// https://github.com/floodyberry/curve25519-donna and
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// https://github.com/floodyberry/ed25519-donna.
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// The curve25519 and ed25519 source files multiplex different repos and
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// architectures using namespaces. The repos are Andrew Moon's
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// curve25519-donna and ed25519-donna. The architectures are 32-bit, 64-bit
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// and SSE. For example, 32-bit x25519 uses symbols from Donna::X25519 and
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// Donna::Arch32.
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// If needed, see Moon's commit "Go back to ignoring 256th bit [sic]",
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// https://github.com/floodyberry/curve25519-donna/commit/57a683d18721a658
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/// \file donna.h
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/// \details Functions for curve25519 and ed25519 operations
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/// \details This header provides the entry points into Andrew Moon's
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/// curve25519 and ed25519 curve functions. The Crypto++ classes x25519
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/// and ed25519 use the functions. The functions are in the <tt>Donna</tt>
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/// namespace and are curve25519_mult(), ed25519_publickey(),
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/// ed25519_sign() and ed25519_sign_open().
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/// \details At the moment the hash function for signing is fixed at
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/// SHA512.
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#ifndef CRYPTOPP_DONNA_H
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#define CRYPTOPP_DONNA_H
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#include "cryptlib.h"
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#include "stdcpp.h"
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NAMESPACE_BEGIN(CryptoPP)
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NAMESPACE_BEGIN(Donna)
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//***************************** curve25519 *****************************//
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/// \brief Generate a public key
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/// \param publicKey byte array for the public key
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/// \param secretKey byte array with the private key
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/// \return 0 on success, non-0 otherwise
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/// \details curve25519_mult() generates a public key from an existing
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/// secret key. Internally curve25519_mult() performs a scalar
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/// multiplication using the base point and writes the result to
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/// <tt>pubkey</tt>.
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int curve25519_mult(byte publicKey[32], const byte secretKey[32]);
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/// \brief Generate a shared key
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/// \param sharedKey byte array for the shared secret
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/// \param secretKey byte array with the private key
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/// \param othersKey byte array with the peer's public key
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/// \return 0 on success, non-0 otherwise
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/// \details curve25519_mult() generates a shared key from an existing
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/// secret key and the other party's public key. Internally
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/// curve25519_mult() performs a scalar multiplication using the two keys
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/// and writes the result to <tt>sharedKey</tt>.
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int curve25519_mult(byte sharedKey[32], const byte secretKey[32], const byte othersKey[32]);
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//******************************* ed25519 *******************************//
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/// \brief Creates a public key from a secret key
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/// \param publicKey byte array for the public key
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/// \param secretKey byte array with the private key
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/// \return 0 on success, non-0 otherwise
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/// \details ed25519_publickey() generates a public key from a secret key.
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/// Internally ed25519_publickey() performs a scalar multiplication
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/// using the secret key and then writes the result to <tt>publicKey</tt>.
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int ed25519_publickey(byte publicKey[32], const byte secretKey[32]);
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/// \brief Creates a signature on a message
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/// \param message byte array with the message
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/// \param messageLength size of the message, in bytes
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/// \param publicKey byte array with the public key
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/// \param secretKey byte array with the private key
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/// \param signature byte array for the signature
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/// \return 0 on success, non-0 otherwise
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/// \details ed25519_sign() generates a signature on a message using
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/// the public and private keys. The various buffers can be exact
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/// sizes, and do not require extra space like when using the
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/// NaCl library functions.
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/// \details At the moment the hash function for signing is fixed at
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/// SHA512.
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int ed25519_sign(const byte* message, size_t messageLength, const byte secretKey[32], const byte publicKey[32], byte signature[64]);
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/// \brief Creates a signature on a message
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/// \param stream std::istream derived class
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/// \param publicKey byte array with the public key
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/// \param secretKey byte array with the private key
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/// \param signature byte array for the signature
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/// \return 0 on success, non-0 otherwise
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/// \details ed25519_sign() generates a signature on a message using
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/// the public and private keys. The various buffers can be exact
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/// sizes, and do not require extra space like when using the
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/// NaCl library functions.
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/// \details This ed25519_sign() overload handles large streams. It
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/// was added for signing and verifying files that are too large
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/// for a memory allocation.
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/// \details At the moment the hash function for signing is fixed at
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/// SHA512.
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int ed25519_sign(std::istream& stream, const byte secretKey[32], const byte publicKey[32], byte signature[64]);
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/// \brief Verifies a signature on a message
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/// \param message byte array with the message
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/// \param messageLength size of the message, in bytes
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/// \param publicKey byte array with the public key
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/// \param signature byte array with the signature
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/// \return 0 on success, non-0 otherwise
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/// \details ed25519_sign_open() verifies a signature on a message using
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/// the public key. The various buffers can be exact sizes, and do not
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/// require extra space like when using the NaCl library functions.
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/// \details At the moment the hash function for signing is fixed at
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/// SHA512.
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int
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ed25519_sign_open(const byte *message, size_t messageLength, const byte publicKey[32], const byte signature[64]);
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/// \brief Verifies a signature on a message
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/// \param stream std::istream derived class
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/// \param publicKey byte array with the public key
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/// \param signature byte array with the signature
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/// \return 0 on success, non-0 otherwise
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/// \details ed25519_sign_open() verifies a signature on a message using
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/// the public key. The various buffers can be exact sizes, and do not
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/// require extra space like when using the NaCl library functions.
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/// \details This ed25519_sign_open() overload handles large streams. It
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/// was added for signing and verifying files that are too large
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/// for a memory allocation.
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/// \details At the moment the hash function for signing is fixed at
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/// SHA512.
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int
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ed25519_sign_open(std::istream& stream, const byte publicKey[32], const byte signature[64]);
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//****************************** Internal ******************************//
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#ifndef CRYPTOPP_DOXYGEN_PROCESSING
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// CRYPTOPP_WORD128_AVAILABLE mostly depends upon GCC support for
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// __SIZEOF_INT128__. If __SIZEOF_INT128__ is not available then Moon
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// provides routines for MSC and GCC. It should cover most platforms,
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// but there are gaps like MS ARM64 and XLC. We tried to enable the
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// 64-bit path for SunCC from 12.5 but we got the dreaded compile
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// error "The operand ___LCM cannot be assigned to".
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#if defined(CRYPTOPP_WORD128_AVAILABLE) || \
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(defined(_MSC_VER) && defined(_M_X64))
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# define CRYPTOPP_CURVE25519_64BIT 1
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#else
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# define CRYPTOPP_CURVE25519_32BIT 1
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#endif
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// Benchmarking on a modern 64-bit Core i5-6400 @2.7 GHz shows SSE2 on Linux
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// is not profitable. Here are the numbers in milliseconds/operation:
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//
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// * Langley, C++, 0.050
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// * Moon, C++: 0.040
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// * Moon, SSE2: 0.061
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// * Moon, native: 0.045
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//
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// However, a modern 64-bit Core i5-3200 @2.5 GHz shows SSE2 is profitable
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// for MS compilers. Here are the numbers in milliseconds/operation:
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//
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// * x86, no SSE2, 0.294
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// * x86, SSE2, 0.097
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// * x64, no SSE2, 0.081
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// * x64, SSE2, 0.071
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#if (CRYPTOPP_SSE2_INTRIN_AVAILABLE) && defined(_MSC_VER)
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# define CRYPTOPP_CURVE25519_SSE2 1
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#endif
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#if (CRYPTOPP_CURVE25519_SSE2)
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extern int curve25519_mult_SSE2(byte sharedKey[32], const byte secretKey[32], const byte othersKey[32]);
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#endif
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#endif // CRYPTOPP_DOXYGEN_PROCESSING
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NAMESPACE_END // Donna
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NAMESPACE_END // CryptoPP
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#endif // CRYPTOPP_DONNA_H
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