package main import ( "dim13.org/signify/bhash" "dim13.org/signify/key" ) func Kdf(enc *key.Enc, ask func() (string, error)) error { if enc.KDFRounds == 0 || ask == nil { enc.KDFRounds = 0 return nil } pass, err := ask() if err != nil { return err } xor := bhash.Pbkdf([]byte(pass), enc.Salt[:], int(enc.KDFRounds), len(enc.Key)) for i := range xor { enc.Key[i] ^= xor[i] } return nil }