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path: root/generate.go
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package main

import (
	"flag"
	"fmt"
	"os"

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

// Usage: signify -G [-n] [-c comment] -p pubkey -s seckey

func generate() error {
	args := flag.NewFlagSet("generate", flag.ExitOnError)
	var (
		nopass  = args.Bool("n", false, "No key passphrase")
		comment = args.String("c", "signify", "Comment")
		pubFile = args.String("p", "", "Public key file (required)")
		encFile = args.String("s", "", "Secret key file (required)")
	)
	args.Parse(os.Args[2:])
	if *pubFile == "" || *encFile == "" {
		args.Usage()
		return nil
	}

	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
}