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crypto_store.go
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crypto_store.go
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package entropystore
import (
"bytes"
"encoding/hex"
"encoding/json"
"fmt"
"github.com/tyler-smith/go-bip39"
"github.com/vitelabs/go-vite/common/types"
vcrypto "github.com/vitelabs/go-vite/crypto"
"github.com/vitelabs/go-vite/wallet/hd-bip/derivation"
"github.com/vitelabs/go-vite/wallet/walleterrors"
"golang.org/x/crypto/scrypt"
"io/ioutil"
"os"
"path/filepath"
"time"
)
const (
// StandardScryptN is the N parameter of Scrypt encryption algorithm, using 256MB
// memory and taking approximately 1s CPU time on chain modern processor.
StandardScryptN = 1 << 18
// StandardScryptP is the P parameter of Scrypt encryption algorithm, using 256MB
// memory and taking approximately 1s CPU time on chain modern processor.
StandardScryptP = 1
scryptR = 8
scryptKeyLen = 32
aesMode = "aes-256-gcm"
scryptName = "scrypt"
)
type CryptoStore struct {
EntropyStoreFilename string
}
func (ks CryptoStore) ExtractSeed(passphrase string) (seed, entropy []byte, err error) {
entropy, err = ks.ExtractEntropy(passphrase)
if err != nil {
return nil, nil, err
}
s, e := bip39.NewMnemonic(entropy)
if e != nil {
return nil, nil, e
}
return bip39.NewSeed(s, ""), entropy, nil
}
func (ks CryptoStore) ExtractEntropy(passphrase string) ([]byte, error) {
keyjson, err := ioutil.ReadFile(ks.EntropyStoreFilename)
if err != nil {
return nil, err
}
key, err := DecryptEntropy(keyjson, passphrase)
if err != nil {
return nil, err
}
return key, nil
}
func (ks CryptoStore) StoreEntropy(entropy []byte, primaryAddr types.Address, passphrase string) error {
keyjson, e := EncryptEntropy(entropy, primaryAddr, passphrase)
if e != nil {
return e
}
e = writeKeyFile(ks.EntropyStoreFilename, keyjson)
if e != nil {
return e
}
return nil
}
func parseJson(keyjson []byte) (k *entropyJSON, kAddress *types.Address, cipherData, nonce, salt []byte, err error) {
k = new(entropyJSON)
// parse and check entropyJSON params
if err := json.Unmarshal(keyjson, k); err != nil {
return nil, nil, nil, nil, nil, err
}
if k.Version != cryptoStoreVersion {
return nil, nil, nil, nil, nil, fmt.Errorf("version number error : %v", k.Version)
}
if !types.IsValidHexAddress(k.PrimaryAddress) {
return nil, nil, nil, nil, nil, fmt.Errorf("address invalid : %v", k.PrimaryAddress)
}
addr, err := types.HexToAddress(k.PrimaryAddress)
if err != nil {
return nil, nil, nil, nil, nil, err
}
// parse and check cryptoJSON params
if k.Crypto.CipherName != aesMode {
return nil, nil, nil, nil, nil, fmt.Errorf("cipherName error : %v", k.Crypto.CipherName)
}
if k.Crypto.KDF != scryptName {
return nil, nil, nil, nil, nil, fmt.Errorf("scryptName error : %v", k.Crypto.KDF)
}
cipherData, err = hex.DecodeString(k.Crypto.CipherText)
if err != nil {
return nil, nil, nil, nil, nil, err
}
nonce, err = hex.DecodeString(k.Crypto.Nonce)
if err != nil {
return nil, nil, nil, nil, nil, err
}
// parse and check scryptParams params
scryptParams := k.Crypto.ScryptParams
salt, err = hex.DecodeString(scryptParams.Salt)
if err != nil {
return nil, nil, nil, nil, nil, err
}
return k, &addr, cipherData, nonce, salt, nil
}
func DecryptEntropy(entropyJson []byte, passphrase string) ([]byte, error) {
k, kAddress, cipherData, nonce, salt, err := parseJson(entropyJson)
if err != nil {
return nil, err
}
scryptParams := k.Crypto.ScryptParams
// begin decrypt
derivedKey, err := scrypt.Key([]byte(passphrase), salt, scryptParams.N, scryptParams.R, scryptParams.P, scryptParams.KeyLen)
if err != nil {
return nil, err
}
entropy, err := vcrypto.AesGCMDecrypt(derivedKey[:32], cipherData, []byte(nonce))
if err != nil {
return nil, walleterrors.ErrDecryptEntropy
}
mnemonic, e := bip39.NewMnemonic(entropy)
if e != nil {
return nil, e
}
seed := bip39.NewSeed(mnemonic, "")
generateAddr, e := derivation.GetPrimaryAddress(seed)
if e != nil {
return nil, e
}
if !bytes.Equal(generateAddr[:], kAddress[:]) {
return nil,
fmt.Errorf("address content not equal. In file it is : %s but generated is : %s",
k.PrimaryAddress, generateAddr.Hex())
}
return entropy, nil
}
func EncryptEntropy(seed []byte, addr types.Address, passphrase string) ([]byte, error) {
n := StandardScryptN
p := StandardScryptP
pwdArray := []byte(passphrase)
salt := vcrypto.GetEntropyCSPRNG(32)
derivedKey, err := scrypt.Key(pwdArray, salt, n, scryptR, p, scryptKeyLen)
if err != nil {
return nil, err
}
encryptKey := derivedKey[:32]
ciphertext, nonce, err := vcrypto.AesGCMEncrypt(encryptKey, seed)
if err != nil {
return nil, err
}
ScryptParams := scryptParams{
N: n,
R: scryptR,
P: p,
KeyLen: scryptKeyLen,
Salt: hex.EncodeToString(salt),
}
cryptoJSON := cryptoJSON{
CipherName: aesMode,
CipherText: hex.EncodeToString(ciphertext),
Nonce: hex.EncodeToString(nonce),
KDF: scryptName,
ScryptParams: ScryptParams,
}
encryptedKeyJSON := entropyJSON{
PrimaryAddress: addr.String(),
Crypto: cryptoJSON,
Version: cryptoStoreVersion,
Timestamp: time.Now().UTC().Unix(),
}
return json.Marshal(encryptedKeyJSON)
}
func writeKeyFile(file string, content []byte) error {
if err := os.MkdirAll(filepath.Dir(file), 0700); err != nil {
return err
}
f, err := ioutil.TempFile(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 os.Rename(f.Name(), file)
}