HashUtil.cpp

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/*
 * BastionGuard™
 * Copyright (C) 2025–2026 Calogero Scarnà
 *
 * 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, version 3.
 *
 * 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 <https://www.gnu.org/licenses/>.
 *
 * BastionGuard™ is a trademark of Calogero Scarnà.
 * The BastionGuard™ name and branding are not licensed under the GPL.
 */
 
#include "HashUtil.hpp"
 
#include <openssl/sha.h>
#include <sstream>
#include <iomanip>
 
std::string HashUtil::sha256(const std::string& input)
{
    unsigned char hash[SHA256_DIGEST_LENGTH];
    SHA256(
        reinterpret_cast<const unsigned char*>(input.c_str()),
        input.size(),
        hash
    );
 
    std::ostringstream oss;
    for (int i = 0; i < SHA256_DIGEST_LENGTH; ++i) {
        oss << std::hex
            << std::setw(2)
            << std::setfill('0')
            << static_cast<int>(hash[i]);
    }
 
    return oss.str();
}