util/common/hash.cpp

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// Copyright (c) 2021 MIT Digital Currency Initiative,
//                    Federal Reserve Bank of Boston
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
#include "hash.hpp"
 
#include "crypto/sha256.h"
 
#include <cstring>
#include <iomanip>
#include <vector>
 
namespace cbdc {
    auto to_string(const hash_t& val) -> std::string {
        std::stringstream ret;
        ret << std::hex << std::setfill('0');
 
        for(const auto& byte : val) {
            ret << std::setw(2) << static_cast<int>(byte);
        }
 
        return ret.str();
    }
 
    auto hash_from_hex(const std::string& val) -> hash_t {
        hash_t ret;
 
        for(size_t i = 0; i < val.size(); i += 2) {
            unsigned int v{};
            std::stringstream s;
            s << std::hex << val.substr(i, 2);
            s >> v;
            ret[i / 2] = static_cast<uint8_t>(v);
        }
 
        return ret;
    }
 
    auto hash_data(const std::byte* data, size_t len) -> hash_t {
        hash_t ret;
        CSHA256 sha;
 
        auto data_vec = std::vector<unsigned char>(len);
        std::memcpy(data_vec.data(), data, len);
        sha.Write(data_vec.data(), len);
        sha.Finalize(ret.data());
 
        return ret;
    }
}