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package main

import (
	"fmt"

	"dim13.org/signify/ask"
	"dim13.org/signify/bhash"
	"dim13.org/signify/file"
	"dim13.org/signify/key"
)

func Generate(pubFile, encFile, comment string, nopass bool) error {
	if err := file.Names(pubFile, encFile); err != nil {
		return err
	}

	pubKey, encKey, err := key.NewKey()
	if err != nil {
		return err
	}

	if nopass {
		encKey.KDFRounds = 0
	}
	if err := Kdf(encKey, ask.Confirmed); err != nil {
		return err
	}

	encRaw, err := key.Marshal(encKey)
	if err != nil {
		return err
	}

	block := &file.Block{
		Comment: fmt.Sprintf("%s secret key", comment),
		Bytes:   encRaw,
	}
	if err := file.EncodeFile(encFile, file.EncMode, block); err != nil {
		return err
	}

	pubRaw, err := key.Marshal(pubKey)
	if err != nil {
		return err
	}
	block = &file.Block{
		Comment: fmt.Sprintf("%s public key", comment),
		Bytes:   pubRaw,
	}
	if err := file.EncodeFile(pubFile, file.PubMode, block); err != nil {
		return err
	}

	return nil
}

func Kdf(enc *key.Enc, ask func() (string, error)) error {
	if 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
}