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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
}