use Crypt::SaltedHash;
 
my $asserted_password = ___; # Some process to retrieve the value 
   # entered on a web form by the user, not illustrated here

my $digest = ___; # Some retrieval process that looks up the earlier-stored
   # digest corresponding to the username, not illustrated here

my $is_valid = Crypt::SaltedHash->validate( $digest, $asserted_password );

grant_account_access() if ( $is_valid );