Program Listing for File PDJE_Crypto_Hash.cpp

↰ Return to documentation for file (include/global/Crypto/PDJE_Crypto_Hash.cpp)

#include "PDJE_Crypto.hpp"
#include <botan/hex.h>
#include <fstream>
namespace PDJE_CRYPTO {
Hash::Hash()
{
    startlog();
    try {
        hashEngine = Botan::HashFunction::create_or_throw("SHA-256");
    } catch (const std::exception &e) {
        critlog("failed to init hash engine. Why: ");
        critlog(e.what());
    }
}

std::string
Hash::TextHash(const std::string &txt)
{
    try {

        hashEngine->update(reinterpret_cast<const uint8_t *>(txt.data()),
                           txt.size());
        return Botan::hex_encode(hashEngine->final());
    } catch (const std::exception &e) {
        critlog("failed to hash text. Why: ");
        critlog(e.what());
        return {};
    }
}

constexpr size_t HashChunkSZ = 64 * 1024;

std::string
Hash::FileHash(const fs::path &fp)
{
    try {

        std::vector<uint8_t> buf(HashChunkSZ);

        std::ifstream file(fp, std::ios::binary);
        if (!file) {
            return {};
        }

        while (file) {
            file.read(reinterpret_cast<char *>(buf.data()), buf.size());
            std::streamsize got = file.gcount();
            if (got > 0) {
                hashEngine->update(buf.data(), static_cast<size_t>(got));
            }
        }
        return Botan::hex_encode(hashEngine->final());
    } catch (const std::exception &e) {
        critlog("failed to hash file. Why: ");
        critlog(e.what());
        return {};
    }
}
}; // namespace PDJE_CRYPTO