Failing to compare passwords

I have been trying to get encrypted passwords to match against plain text passwords in a plugin am working on. This is what I have been using, however, I get password match failed.

add_filter('wp_authenticate_user', 'custom_authentication', 10 , 2);
	
 function custom_authentication($emailAdd, $password) {
		//include_once('././wp-includes/class-phpass.php');
		global $wpdb, $wp_hasher, $formErr;
		if(1 > count($formErr->get_error_messages())){
			//$wp_hasher = new PasswordHash(8, TRUE);
			$table = $wpdb->prefix.'finusers';
			$results=$wpdb->get_row("SELECT * FROM $table WHERE email_address='$emailAdd'");
			$hash = $results->password;
			if(wp_check_password($hash, $password)){
				echo "Password Matched";
			}else{
				echo "Password Match Failed";
			}
		}
	}