github.com/theQRL/go-zond@v0.1.1/accounts/keystore/key.go

// Copyright 2014 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.

package keystore

import (
	"encoding/hex"
	"encoding/json"
	"fmt"
	"os"
	"path/filepath"
	"time"

	"github.com/google/uuid"
	"github.com/theQRL/go-qrllib/dilithium"
	"github.com/theQRL/go-zond/accounts"
	"github.com/theQRL/go-zond/common"
	"github.com/theQRL/go-zond/pqcrypto"
)

const (
	version = 3
)

type Key struct {
	Id uuid.UUID // Version 4 "random" for unique id not derived from key data
	// to simplify lookups we also store the address
	Address common.Address
	// we only store seed as pubkey/address & private key can be derived from it
	// seed in this struct is always in plaintext
	Dilithium *dilithium.Dilithium
}

type keyStore interface {
	// Loads and decrypts the key from disk.
	GetKey(addr common.Address, filename string, auth string) (*Key, error)
	// Writes and encrypts the key.
	StoreKey(filename string, k *Key, auth string) error
	// Joins filename with the key directory unless it is already absolute.
	JoinPath(filename string) string
}

type plainKeyJSON struct {
	Address string `json:"address"`
	HexSeed string `json:"hexSeed"`
	Id      string `json:"id"`
	Version int    `json:"version"`
}

type encryptedKeyJSONV3 struct {
	Address string     `json:"address"`
	Crypto  CryptoJSON `json:"crypto"`
	Id      string     `json:"id"`
	Version int        `json:"version"`
}

type encryptedKeyJSONV1 struct {
	Address string     `json:"address"`
	Crypto  CryptoJSON `json:"crypto"`
	Id      string     `json:"id"`
	Version string     `json:"version"`
}

type CryptoJSON struct {
	Cipher       string                 `json:"cipher"`
	CipherText   string                 `json:"ciphertext"`
	CipherParams cipherparamsJSON       `json:"cipherparams"`
	KDF          string                 `json:"kdf"`
	KDFParams    map[string]interface{} `json:"kdfparams"`
	MAC          string                 `json:"mac"`
}

type cipherparamsJSON struct {
	IV string `json:"iv"`
}

func (k *Key) MarshalJSON() (j []byte, err error) {
	jStruct := plainKeyJSON{
		hex.EncodeToString(k.Address[:]),
		k.Dilithium.GetHexSeed(),
		k.Id.String(),
		version,
	}
	j, err = json.Marshal(jStruct)
	return j, err
}

func (k *Key) UnmarshalJSON(j []byte) (err error) {
	keyJSON := new(plainKeyJSON)
	err = json.Unmarshal(j, &keyJSON)
	if err != nil {
		return err
	}

	u := new(uuid.UUID)
	*u, err = uuid.Parse(keyJSON.Id)
	if err != nil {
		return err
	}
	k.Id = *u
	addr, err := hex.DecodeString(keyJSON.Address)
	if err != nil {
		return err
	}

	k.Address = common.BytesToAddress(addr)
	k.Dilithium, err = pqcrypto.HexToDilithium(keyJSON.HexSeed)
	if err != nil {
		return err
	}

	return nil
}

func newKeyFromDilithium(d *dilithium.Dilithium) *Key {
	id, err := uuid.NewRandom()
	if err != nil {
		panic(fmt.Sprintf("Could not create random uuid: %v", err))
	}
	key := &Key{
		Id:        id,
		Address:   d.GetAddress(),
		Dilithium: d,
	}
	return key
}

func newKey() (*Key, error) {
	d, err := dilithium.New()
	if err != nil {
		return nil, err
	}
	return newKeyFromDilithium(d), nil
}

func storeNewKey(ks keyStore, auth string) (*Key, accounts.Account, error) {
	key, err := newKey()
	if err != nil {
		return nil, accounts.Account{}, err
	}
	a := accounts.Account{
		Address: key.Address,
		URL:     accounts.URL{Scheme: KeyStoreScheme, Path: ks.JoinPath(keyFileName(key.Address))},
	}
	if err := ks.StoreKey(a.URL.Path, key, auth); err != nil {
		zeroKey(&key.Dilithium)
		return nil, a, err
	}
	return key, a, err
}

func writeTemporaryKeyFile(file string, content []byte) (string, error) {
	// Create the keystore directory with appropriate permissions
	// in case it is not present yet.
	const dirPerm = 0700
	if err := os.MkdirAll(filepath.Dir(file), dirPerm); err != nil {
		return "", err
	}
	// Atomic write: create a temporary hidden file first
	// then move it into place. TempFile assigns mode 0600.
	f, err := os.CreateTemp(filepath.Dir(file), "."+filepath.Base(file)+".tmp")
	if err != nil {
		return "", err
	}
	if _, err := f.Write(content); err != nil {
		f.Close()
		os.Remove(f.Name())
		return "", err
	}
	f.Close()
	return f.Name(), nil
}

func writeKeyFile(file string, content []byte) error {
	name, err := writeTemporaryKeyFile(file, content)
	if err != nil {
		return err
	}
	return os.Rename(name, file)
}

// keyFileName implements the naming convention for keyfiles:
// UTC--<created_at UTC ISO8601>-<address hex>
func keyFileName(keyAddr common.Address) string {
	ts := time.Now().UTC()
	return fmt.Sprintf("UTC--%s--%s", toISO8601(ts), hex.EncodeToString(keyAddr[:]))
}

func toISO8601(t time.Time) string {
	var tz string
	name, offset := t.Zone()
	if name == "UTC" {
		tz = "Z"
	} else {
		tz = fmt.Sprintf("%03d00", offset/3600)
	}
	return fmt.Sprintf("%04d-%02d-%02dT%02d-%02d-%02d.%09d%s",
		t.Year(), t.Month(), t.Day(), t.Hour(), t.Minute(), t.Second(), t.Nanosecond(), tz)
}