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/*
* This file is part of the TrinityCore Project. See AUTHORS file for Copyright information
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "Ed25519.h"
#include "CryptoHash.h"
#include "Memory.h"
#include <ed25519/ed25519.h>
#include <openssl/pem.h>
#include <memory>
namespace Trinity::Crypto
{
Ed25519::Ed25519() = default;
Ed25519::Ed25519(Ed25519 const& right)
{
*this = right;
}
Ed25519::Ed25519(Ed25519&& right) noexcept
{
*this = std::move(right);
}
Ed25519::~Ed25519()
{
EVP_PKEY_free(_key);
}
Ed25519& Ed25519::operator=(Ed25519 const& right)
{
if (this == &right)
return *this;
_key = right._key; // EVP_PKEY uses reference counting internally, just copy the pointer
EVP_PKEY_up_ref(_key); // Bump reference count for PKEY, as every instance of this class holds two references to PKEY and destructor decrements it twice
return *this;
}
Ed25519& Ed25519::operator=(Ed25519&& right) noexcept
{
if (this == &right)
return *this;
_key = std::exchange(right._key, EVP_PKEY_new());
return *this;
}
bool Ed25519::LoadFromFile(std::string const& fileName)
{
if (_key)
{
EVP_PKEY_free(_key);
_key = nullptr;
}
auto keyBIO = make_unique_ptr_with_deleter(BIO_new_file(fileName.c_str(), "r"), &BIO_free);
if (!keyBIO)
return false;
_key = EVP_PKEY_new();
if (!PEM_read_bio_PrivateKey(keyBIO.get(), &_key, nullptr, nullptr))
return false;
return true;
}
bool Ed25519::LoadFromString(std::string const& keyPem)
{
if (_key)
{
EVP_PKEY_free(_key);
_key = nullptr;
}
auto keyBIO = make_unique_ptr_with_deleter(BIO_new_mem_buf(
const_cast<char*>(keyPem.c_str()) /*api hack - this function assumes memory is readonly but lacks const modifier*/,
keyPem.length() + 1), &BIO_free);
if (!keyBIO)
return false;
_key = EVP_PKEY_new();
if (!PEM_read_bio_PrivateKey(keyBIO.get(), &_key, nullptr, nullptr))
return false;
return true;
}
bool Ed25519::LoadFromByteArray(std::array<uint8, 32> const& keyBytes)
{
if (_key)
{
EVP_PKEY_free(_key);
_key = nullptr;
}
_key = EVP_PKEY_new_raw_private_key(EVP_PKEY_ED25519, nullptr, keyBytes.data(), keyBytes.size());
if (!_key)
return false;
return true;
}
bool Ed25519::Sign(uint8 const* message, std::size_t messageLength, std::vector<uint8>& output)
{
constexpr size_t KeySize = 32;
uint8 publicKey[KeySize] = {};
std::size_t keyLength = KeySize;
EVP_PKEY_get_raw_public_key(_key, publicKey, &keyLength);
uint8 privateKey[KeySize] = {};
keyLength = KeySize;
EVP_PKEY_get_raw_private_key(_key, privateKey, &keyLength);
output.resize(64);
int result = ED25519_sign(output.data(), message, messageLength, publicKey, privateKey);
return result != 0;
}
bool Ed25519::SignWithContext(uint8 const* message, std::size_t messageLength, std::vector<uint8> const& context, std::vector<uint8>& output)
{
constexpr size_t KeySize = 32;
uint8 publicKey[KeySize] = {};
std::size_t keyLength = KeySize;
EVP_PKEY_get_raw_public_key(_key, publicKey, &keyLength);
uint8 privateKey[KeySize] = {};
keyLength = KeySize;
EVP_PKEY_get_raw_private_key(_key, privateKey, &keyLength);
output.resize(64);
int result = ED25519_sign_ctx(output.data(), message, messageLength, publicKey, privateKey, context.data(), context.size());
return result != 0;
}
}
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