forked from cerc-io/plugeth
Add ImportPreSaleKey
* ImportPreSaleKey takes a KeyStore, a presale key JSON (e.g. file content) and a password string. It stores the key in the given key store. * Refactored common AES decryption and moved some functions to crypto.go
This commit is contained in:
Gustav Simonsson
parent
4df2e1ef5c
commit
1f8290ca44
104
crypto/crypto.go
104
crypto/crypto.go
@ -1,12 +1,19 @@
|
||||
package crypto
|
||||
|
||||
import (
|
||||
"crypto/aes"
|
||||
"crypto/cipher"
|
||||
"crypto/ecdsa"
|
||||
"crypto/elliptic"
|
||||
"crypto/rand"
|
||||
"crypto/sha256"
|
||||
"errors"
|
||||
|
||||
"code.google.com/p/go-uuid/uuid"
|
||||
"code.google.com/p/go.crypto/pbkdf2"
|
||||
"code.google.com/p/go.crypto/ripemd160"
|
||||
"encoding/hex"
|
||||
"encoding/json"
|
||||
"github.com/ethereum/go-ethereum/crypto/secp256k1"
|
||||
"github.com/ethereum/go-ethereum/crypto/sha3"
|
||||
"github.com/ethereum/go-ethereum/ethutil"
|
||||
@ -113,3 +120,100 @@ func Decrypt(prv *ecdsa.PrivateKey, ct []byte) ([]byte, error) {
|
||||
key := ecies.ImportECDSA(prv)
|
||||
return key.Decrypt(rand.Reader, ct, nil, nil)
|
||||
}
|
||||
|
||||
// creates a Key and stores that in the given KeyStore by decrypting a presale key JSON
|
||||
func ImportPreSaleKey(keyStore KeyStore2, keyJSON []byte, password string) (*Key, error) {
|
||||
key, err := decryptPreSaleKey(keyJSON, password)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
id := uuid.NewRandom()
|
||||
key.Id = &id
|
||||
err = keyStore.StoreKey(key, password)
|
||||
return key, err
|
||||
}
|
||||
|
||||
func decryptPreSaleKey(fileContent []byte, password string) (key *Key, err error) {
|
||||
preSaleKeyStruct := struct {
|
||||
EncSeed string
|
||||
EthAddr string
|
||||
Email string
|
||||
BtcAddr string
|
||||
}{}
|
||||
err = json.Unmarshal(fileContent, &preSaleKeyStruct)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
encSeedBytes, err := hex.DecodeString(preSaleKeyStruct.EncSeed)
|
||||
iv := encSeedBytes[:16]
|
||||
cipherText := encSeedBytes[16:]
|
||||
/*
|
||||
See https://github.com/ethereum/pyethsaletool
|
||||
|
||||
pyethsaletool generates the encryption key from password by
|
||||
2000 rounds of PBKDF2 with HMAC-SHA-256 using password as salt (:().
|
||||
16 byte key length within PBKDF2 and resulting key is used as AES key
|
||||
*/
|
||||
passBytes := []byte(password)
|
||||
derivedKey := pbkdf2.Key(passBytes, passBytes, 2000, 16, sha256.New)
|
||||
plainText, err := aes_cbc_decrypt(derivedKey, cipherText, iv)
|
||||
ethPriv := Sha3(plainText)
|
||||
ecKey := ToECDSA(ethPriv)
|
||||
key = &Key{
|
||||
Id: nil,
|
||||
PrivateKey: ecKey,
|
||||
}
|
||||
derivedAddr := ethutil.Bytes2Hex(key.Address())
|
||||
expectedAddr := preSaleKeyStruct.EthAddr
|
||||
if derivedAddr != expectedAddr {
|
||||
err = errors.New("decrypted addr not equal to expected addr")
|
||||
}
|
||||
return key, err
|
||||
}
|
||||
|
||||
func aes_cbc_decrypt(key []byte, cipherText []byte, iv []byte) (plainText []byte, err error) {
|
||||
aesBlock, err := aes.NewCipher(key)
|
||||
if err != nil {
|
||||
return plainText, err
|
||||
}
|
||||
decrypter := cipher.NewCBCDecrypter(aesBlock, iv)
|
||||
paddedPlainText := make([]byte, len(cipherText))
|
||||
decrypter.CryptBlocks(paddedPlainText, cipherText)
|
||||
plainText = PKCS7Unpad(paddedPlainText)
|
||||
if plainText == nil {
|
||||
err = errors.New("Decryption failed: PKCS7Unpad failed after decryption")
|
||||
}
|
||||
return plainText, err
|
||||
}
|
||||
|
||||
// From https://leanpub.com/gocrypto/read#leanpub-auto-block-cipher-modes
|
||||
func PKCS7Pad(in []byte) []byte {
|
||||
padding := 16 - (len(in) % 16)
|
||||
if padding == 0 {
|
||||
padding = 16
|
||||
}
|
||||
for i := 0; i < padding; i++ {
|
||||
in = append(in, byte(padding))
|
||||
}
|
||||
return in
|
||||
}
|
||||
|
||||
func PKCS7Unpad(in []byte) []byte {
|
||||
if len(in) == 0 {
|
||||
return nil
|
||||
}
|
||||
|
||||
padding := in[len(in)-1]
|
||||
if int(padding) > len(in) || padding > aes.BlockSize {
|
||||
return nil
|
||||
} else if padding == 0 {
|
||||
return nil
|
||||
}
|
||||
|
||||
for i := len(in) - 1; i > len(in)-int(padding)-1; i-- {
|
||||
if in[i] != padding {
|
||||
return nil
|
||||
}
|
||||
}
|
||||
return in[:len(in)-int(padding)]
|
||||
}
|
||||
|
||||
@ -57,7 +57,7 @@ type encryptedKeyJSON struct {
|
||||
|
||||
func (k *Key) Address() []byte {
|
||||
pubBytes := FromECDSAPub(&k.PrivateKey.PublicKey)
|
||||
return Sha3(pubBytes)[12:]
|
||||
return Sha3(pubBytes[1:])[12:]
|
||||
}
|
||||
|
||||
func (k *Key) MarshalJSON() (j []byte, err error) {
|
||||
@ -99,9 +99,10 @@ func NewKey(rand io.Reader) *Key {
|
||||
privateKeyMarshalled := elliptic.Marshal(S256(), x, y)
|
||||
privateKeyECDSA := ToECDSA(privateKeyMarshalled)
|
||||
|
||||
key := new(Key)
|
||||
id := uuid.NewRandom()
|
||||
key.Id = &id
|
||||
key.PrivateKey = privateKeyECDSA
|
||||
key := &Key{
|
||||
Id: &id,
|
||||
PrivateKey: privateKeyECDSA,
|
||||
}
|
||||
return key
|
||||
}
|
||||
|
||||
@ -178,22 +178,10 @@ func DecryptKey(ks keyStorePassphrase, keyId *uuid.UUID, auth string) (keyBytes
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
AES256Block, err := aes.NewCipher(derivedKey)
|
||||
plainText, err := aes_cbc_decrypt(derivedKey, cipherText, iv)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
AES256CBCDecrypter := cipher.NewCBCDecrypter(AES256Block, iv)
|
||||
paddedPlainText := make([]byte, len(cipherText))
|
||||
AES256CBCDecrypter.CryptBlocks(paddedPlainText, cipherText)
|
||||
|
||||
plainText := PKCS7Unpad(paddedPlainText)
|
||||
if plainText == nil {
|
||||
err = errors.New("Decryption failed: PKCS7Unpad failed after decryption")
|
||||
return nil, err
|
||||
}
|
||||
|
||||
keyBytes = plainText[:len(plainText)-32]
|
||||
keyBytesHash := plainText[len(plainText)-32:]
|
||||
if !bytes.Equal(Sha3(keyBytes), keyBytesHash) {
|
||||
@ -211,35 +199,3 @@ func getEntropyCSPRNG(n int) []byte {
|
||||
}
|
||||
return mainBuff
|
||||
}
|
||||
|
||||
// From https://leanpub.com/gocrypto/read#leanpub-auto-block-cipher-modes
|
||||
func PKCS7Pad(in []byte) []byte {
|
||||
padding := 16 - (len(in) % 16)
|
||||
if padding == 0 {
|
||||
padding = 16
|
||||
}
|
||||
for i := 0; i < padding; i++ {
|
||||
in = append(in, byte(padding))
|
||||
}
|
||||
return in
|
||||
}
|
||||
|
||||
func PKCS7Unpad(in []byte) []byte {
|
||||
if len(in) == 0 {
|
||||
return nil
|
||||
}
|
||||
|
||||
padding := in[len(in)-1]
|
||||
if int(padding) > len(in) || padding > aes.BlockSize {
|
||||
return nil
|
||||
} else if padding == 0 {
|
||||
return nil
|
||||
}
|
||||
|
||||
for i := len(in) - 1; i > len(in)-int(padding)-1; i-- {
|
||||
if in[i] != padding {
|
||||
return nil
|
||||
}
|
||||
}
|
||||
return in[:len(in)-int(padding)]
|
||||
}
|
||||
|
||||
@ -83,3 +83,16 @@ func TestKeyStorePassphraseDecryptionFail(t *testing.T) {
|
||||
t.Fatal(err)
|
||||
}
|
||||
}
|
||||
|
||||
func TestImportPreSaleKey(t *testing.T) {
|
||||
// file content of a presale key file generated with:
|
||||
// python pyethsaletool.py genwallet
|
||||
// with password "foo"
|
||||
fileContent := "{\"encseed\": \"26d87f5f2bf9835f9a47eefae571bc09f9107bb13d54ff12a4ec095d01f83897494cf34f7bed2ed34126ecba9db7b62de56c9d7cd136520a0427bfb11b8954ba7ac39b90d4650d3448e31185affcd74226a68f1e94b1108e6e0a4a91cdd83eba\", \"ethaddr\": \"d4584b5f6229b7be90727b0fc8c6b91bb427821f\", \"email\": \"gustav.simonsson@gmail.com\", \"btcaddr\": \"1EVknXyFC68kKNLkh6YnKzW41svSRoaAcx\"}"
|
||||
ks := NewKeyStorePassphrase(DefaultDataDir())
|
||||
pass := "foo"
|
||||
_, err := ImportPreSaleKey(ks, []byte(fileContent), pass)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user