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crypto.go
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crypto.go
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// 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 crypto
import (
"bytes"
"crypto/ecdsa"
"crypto/elliptic"
"crypto/hmac"
"crypto/rand"
"crypto/sha1"
"crypto/sha512"
"encoding/hex"
"errors"
"fmt"
"hash"
"io"
"io/ioutil"
"math/big"
"os"
"strings"
sha256 "github.com/minio/sha256-simd"
"github.com/vntchain/go-vnt/common"
"github.com/vntchain/go-vnt/common/math"
"github.com/vntchain/go-vnt/crypto/sha3"
"github.com/vntchain/go-vnt/rlp"
)
var (
secp256k1N, _ = new(big.Int).SetString("fffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141", 16)
secp256k1halfN = new(big.Int).Div(secp256k1N, big.NewInt(2))
)
var errInvalidPubkey = errors.New("invalid secp256k1 public key")
// Keccak256 calculates and returns the Keccak256 hash of the input data.
func Keccak256(data ...[]byte) []byte {
d := sha3.NewKeccak256()
for _, b := range data {
d.Write(b)
}
return d.Sum(nil)
}
// Keccak256Hash calculates and returns the Keccak256 hash of the input data,
// converting it to an internal Hash data structure.
func Keccak256Hash(data ...[]byte) (h common.Hash) {
d := sha3.NewKeccak256()
for _, b := range data {
d.Write(b)
}
d.Sum(h[:0])
return h
}
// Keccak512 calculates and returns the Keccak512 hash of the input data.
func Keccak512(data ...[]byte) []byte {
d := sha3.NewKeccak512()
for _, b := range data {
d.Write(b)
}
return d.Sum(nil)
}
// CreateAddress creates an hubble address given the bytes and the nonce
func CreateAddress(b common.Address, nonce uint64) common.Address {
data, _ := rlp.EncodeToBytes([]interface{}{b, nonce})
return common.BytesToAddress(Keccak256(data)[12:])
}
// ToECDSA creates a private key with the given D value.
func ToECDSA(d []byte) (*ecdsa.PrivateKey, error) {
return toECDSA(d, true)
}
// ToECDSAUnsafe blindly converts a binary blob to a private key. It should almost
// never be used unless you are sure the input is valid and want to avoid hitting
// errors due to bad origin encoding (0 prefixes cut off).
func ToECDSAUnsafe(d []byte) *ecdsa.PrivateKey {
priv, _ := toECDSA(d, false)
return priv
}
// toECDSA creates a private key with the given D value. The strict parameter
// controls whether the key's length should be enforced at the curve size or
// it can also accept legacy encodings (0 prefixes).
func toECDSA(d []byte, strict bool) (*ecdsa.PrivateKey, error) {
priv := new(ecdsa.PrivateKey)
priv.PublicKey.Curve = S256()
if strict && 8*len(d) != priv.Params().BitSize {
return nil, fmt.Errorf("invalid length, need %d bits", priv.Params().BitSize)
}
priv.D = new(big.Int).SetBytes(d)
// The priv.D must < N
if priv.D.Cmp(secp256k1N) >= 0 {
return nil, fmt.Errorf("invalid private key, >=N")
}
// The priv.D must not be zero or negative.
if priv.D.Sign() <= 0 {
return nil, fmt.Errorf("invalid private key, zero or negative")
}
priv.PublicKey.X, priv.PublicKey.Y = priv.PublicKey.Curve.ScalarBaseMult(d)
if priv.PublicKey.X == nil {
return nil, errors.New("invalid private key")
}
return priv, nil
}
// FromECDSA exports a private key into a binary dump.
func FromECDSA(priv *ecdsa.PrivateKey) []byte {
if priv == nil {
return nil
}
return math.PaddedBigBytes(priv.D, priv.Params().BitSize/8)
}
// UnmarshalPubkey converts bytes to a secp256k1 public key.
func UnmarshalPubkey(pub []byte) (*ecdsa.PublicKey, error) {
x, y := elliptic.Unmarshal(S256(), pub)
if x == nil {
return nil, errInvalidPubkey
}
return &ecdsa.PublicKey{Curve: S256(), X: x, Y: y}, nil
}
func FromECDSAPub(pub *ecdsa.PublicKey) []byte {
if pub == nil || pub.X == nil || pub.Y == nil {
return nil
}
return elliptic.Marshal(S256(), pub.X, pub.Y)
}
// HexToECDSA parses a secp256k1 private key.
func HexToECDSA(hexkey string) (*ecdsa.PrivateKey, error) {
b, err := hex.DecodeString(hexkey)
if err != nil {
return nil, errors.New("invalid hex string")
}
return ToECDSA(b)
}
// LoadECDSA loads a secp256k1 private key from the given file.
func LoadECDSA(file string) (*ecdsa.PrivateKey, error) {
buf := make([]byte, 64)
fd, err := os.Open(file)
if err != nil {
return nil, err
}
defer fd.Close()
if _, err := io.ReadFull(fd, buf); err != nil {
return nil, err
}
key, err := hex.DecodeString(string(buf))
if err != nil {
return nil, err
}
return ToECDSA(key)
}
// SaveECDSA saves a secp256k1 private key to the given file with
// restrictive permissions. The key data is saved hex-encoded.
func SaveECDSA(file string, key *ecdsa.PrivateKey) error {
k := hex.EncodeToString(FromECDSA(key))
return ioutil.WriteFile(file, []byte(k), 0600)
}
// === BEGIN ====P
// 目前看来是不必要的
// func GetPublicKeyFromByte(bkey []byte) (*ecdsa.PublicKey, error) {
// pk, err := x509.ParsePKIXPublicKey(bkey)
// if err != nil {
// return nil, err
// }
// var pubkey *ecdsa.PublicKey
// switch pk.(type) {
// case *ecdsa.PublicKey:
// pubkey = pk.(*ecdsa.PublicKey)
// default:
// return nil, fmt.Errorf("PublicKey type error")
// }
// return pubkey, nil
// }
func GenerateKeyByWord(key string) (*ecdsa.PrivateKey, error) {
length := len([]byte(key))
var curve elliptic.Curve
if length >= 256/8+8 && length < 384/8+8 {
curve = S256()
} else {
panic("length is not enough")
}
return ecdsa.GenerateKey(curve, strings.NewReader(key))
}
type GenSharedKey func([]byte) ([]byte, error)
func GenerateEKeyPair(curveName string) ([]byte, GenSharedKey, error) {
var curve elliptic.Curve
// switch curveName {
// case "P-256":
// curve = elliptic.P256()
// case "P-384":
// curve = elliptic.P384()
// case "P-521":
// curve = elliptic.P521()
// }
curve = S256()
priv, x, y, err := elliptic.GenerateKey(curve, rand.Reader)
if err != nil {
return nil, nil, err
}
pubKey := elliptic.Marshal(curve, x, y)
done := func(theirPub []byte) ([]byte, error) {
// Verify and unpack node's public key.
x, y := elliptic.Unmarshal(curve, theirPub)
if x == nil {
return nil, fmt.Errorf("Malformed public key: %d %v", len(theirPub), theirPub)
}
if !curve.IsOnCurve(x, y) {
return nil, errors.New("Invalid public key.")
}
// Generate shared secret.
secret, _ := curve.ScalarMult(x, y, priv)
return secret.Bytes(), nil
}
return pubKey, done, nil
}
type StretchedKeys struct {
IV []byte
MacKey []byte
CipherKey []byte
}
func KeyStretcher(cipherType string, hashType string, secret []byte) (StretchedKeys, StretchedKeys) {
var cipherKeySize int
var ivSize int
switch cipherType {
case "AES-128":
ivSize = 16
cipherKeySize = 16
case "AES-256":
ivSize = 16
cipherKeySize = 32
case "Blowfish":
ivSize = 8
// Note: 24 arbitrarily selected, needs more thought
cipherKeySize = 32
}
hmacKeySize := 20
seed := []byte("key expansion")
result := make([]byte, 2*(ivSize+cipherKeySize+hmacKeySize))
var h func() hash.Hash
switch hashType {
case "SHA1":
h = sha1.New
case "SHA256":
h = sha256.New
case "SHA512":
h = sha512.New
default:
panic("Unrecognized hash function, programmer error?")
}
m := hmac.New(h, secret)
m.Write(seed)
a := m.Sum(nil)
j := 0
for j < len(result) {
m.Reset()
m.Write(a)
m.Write(seed)
b := m.Sum(nil)
todo := len(b)
if j+todo > len(result) {
todo = len(result) - j
}
copy(result[j:j+todo], b)
j += todo
m.Reset()
m.Write(a)
a = m.Sum(nil)
}
half := len(result) / 2
r1 := result[:half]
r2 := result[half:]
var k1 StretchedKeys
var k2 StretchedKeys
k1.IV = r1[0:ivSize]
k1.CipherKey = r1[ivSize : ivSize+cipherKeySize]
k1.MacKey = r1[ivSize+cipherKeySize:]
k2.IV = r2[0:ivSize]
k2.CipherKey = r2[ivSize : ivSize+cipherKeySize]
k2.MacKey = r2[ivSize+cipherKeySize:]
return k1, k2
}
func KeyEqual(a *ecdsa.PublicKey, b *ecdsa.PublicKey) bool {
abyte := CompressPubkey(a)
bbyte := CompressPubkey(b)
return bytes.Equal(abyte, bbyte)
}
//===== END ======
func GenerateKey() (*ecdsa.PrivateKey, error) {
return ecdsa.GenerateKey(S256(), rand.Reader)
}
// ValidateSignatureValues verifies whether the signature values are valid with
// the given chain rules. The v value is assumed to be either 0 or 1.
func ValidateSignatureValues(v byte, r, s *big.Int, hubble bool) bool {
if r.Cmp(common.Big1) < 0 || s.Cmp(common.Big1) < 0 {
return false
}
// reject upper range of s values (ECDSA malleability)
// see discussion in secp256k1/libsecp256k1/include/secp256k1.h
if hubble && s.Cmp(secp256k1halfN) > 0 {
return false
}
// Frontier: allow s to be in full N range
return r.Cmp(secp256k1N) < 0 && s.Cmp(secp256k1N) < 0 && (v == 0 || v == 1)
}
func PubkeyToAddress(p ecdsa.PublicKey) common.Address {
pubBytes := FromECDSAPub(&p)
return common.BytesToAddress(Keccak256(pubBytes[1:])[12:])
}
func zeroBytes(bytes []byte) {
for i := range bytes {
bytes[i] = 0
}
}