PQconnectdbParams and encrypted password

Hi
I need some help with setting PQconnectdbParams key/value for encrypted password

suppose I created user with the string

create user foobar with encrypted password ‘md5f3c33545d22dbf811737afb8d0e85597’

I was able to connect successfully using

psql -U foobar

I guess my pg_hba.conf is OK:

local all foobar md5
host all foobar 127.0.0.1/32 md5
host all foobar 0.0.0.0/0 md5

however

I have a problem to connect to the server from my C++ program using PQconnectdbParams function

const std::pair<std::string, std::string> connParams[] = {
{"host", “localhost"},
{"port", ""},
{"user", “foobar"},
{"password", ??????????????},//I’d like to have here “md5f3c33545d22dbf811737afb8d0e85597”, but it doesn’t work
{"options","password_encryption='md5'"},
{"dbname", "test_db"},
{"connect_timeout", “10"}
};
const char* keywords[] = {connParams[0].first.c_str(),
connParams[1].first.c_str(),
connParams[2].first.c_str(),
connParams[3].first.c_str(),
connParams[4].first.c_str(),
connParams[5].first.c_str(),
connParams[6].first.c_str(),
nullptr};
const char* connValues[] = {connParams[0].second.c_str(),
connParams[1].second.c_str(),
connParams[2].second.c_str(),
connParams[3].second.c_str(),
connParams[4].second.c_str(),
connParams[5].second.c_str(),
connParams[6].second.c_str(),
nullptr};

auto db = PQconnectdbParams(keywords, connValues)

whatever I tried ConnStatusType of the db is CONNECTION_BAD

if I use value as “open” string for the key=“password”, then connection was successful

thanks in advance

dm