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package main

import (
	"bytes"
	"crypto/sha512"
	"errors"

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

type EncKey struct {
	PKAlg     [2]byte
	KDFAlg    [2]byte
	KDFRounds uint32 // network byte order
	Salt      [16]byte
	Checksum  [8]byte
	KeyNum    [KeyNumLen]byte
	SecKey    [ed25519.PrivateKeySize]byte
}

var ErrChecksum = errors.New("checksum mismatch")

func (v *EncKey) Valid() bool {
	sum := sha512.Sum512(v.SecKey[:])
	return bytes.Equal(sum[:len(v.Checksum)], v.Checksum[:])
}

func (v *EncKey) Unmarshal(b []byte) error {
	if err := DecodeBase64(v, b); err != nil {
		return err
	}
	if !v.Valid() {
		return ErrChecksum
	}
	return nil
}

func (v *EncKey) Marshal() ([]byte, error) { return EncodeBase64(v) }