local stored_key, server_key, iteration_count, salt = credentials.stored_key, credentials.server_key, credentials.iteration_count, credentials.salt;
stored_key = stored_key and from_hex(stored_key);
server_key = server_key and from_hex(server_key);
local stored_key, server_key, iteration_count, salt = credentials.stored_key, credentials.server_key, credentials.iteration_count, credentials.salt;
stored_key = stored_key and from_hex(stored_key);
server_key = server_key and from_hex(server_key);