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package main

import (
	"crypto/rand"
	"crypto/sha512"

	"golang.org/x/crypto/ed25519"
)

func Generate(pubkeyfile, seckeyfile, comment string, rounds int) error {
	pub, sec, err := ed25519.GenerateKey(rand.Reader)
	if err != nil {
		return err
	}

	digest := sha512.Sum512(sec)
	enckey := new(EncKey)
	copy(enckey.PKAlg[:], PKAlg[:])
	copy(enckey.KDFAlg[:], KDFAlg[:])
	copy(enckey.SecKey[:], sec[:])
	enckey.KDFRounds = uint32(rounds)
	// KDF
	rand.Read(enckey.KeyNum[:])
	rand.Read(enckey.Salt[:])
	copy(enckey.Checksum[:], digest[:len(enckey.Checksum)])

	sb64, err := Marshal(enckey)
	if err != nil {
		return err
	}

	sfile := File{
		Comment: comment + " secret key",
		B64:     sb64,
	}
	if err := sfile.WriteFile(seckeyfile, SecMode); err != nil {
		return err
	}

	pubkey := new(PubKey)
	copy(pubkey.PKAlg[:], PKAlg[:])
	copy(pubkey.KeyNum[:], enckey.KeyNum[:])
	copy(pubkey.PubKey[:], pub[:])

	pb64, err := Marshal(enckey)
	if err != nil {
		return err
	}
	pfile := File{
		Comment: comment + " public key",
		B64:     pb64,
	}
	if err := pfile.WriteFile(pubkeyfile, PubMode); err != nil {
		return err
	}

	return nil
}