Function unhexKey

src/Compression/CompressionCodecEncrypted.cpp:252–262

}

String unhexKey(const String & hex)
{
    try
    {
        return boost::algorithm::unhex(hex);
    }
    catch (const std::exception &)
    {
        throw Exception(ErrorCodes::BAD_ARGUMENTS, "Cannot read key_hex, check for valid characters [0-9a-fA-F] and length");
    }
}

/// Firstly, write a byte, which shows if the nonce will be put in text (if it was defined in config)
/// Secondly, write nonce in text (this step depends from first step)