mirror of
https://github.com/ethereum/go-ethereum.git
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574 lines
17 KiB
Go
574 lines
17 KiB
Go
// Copyright 2014 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package crypto
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import (
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"crypto/ecdsa"
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"crypto/elliptic"
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"crypto/rand"
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"encoding/hex"
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"errors"
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"fmt"
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"io"
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"io/ioutil"
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"math/big"
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"os"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/common/hexutil"
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"github.com/ethereum/go-ethereum/common/math"
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//usha3 "github.com/ethereum/go-ethereum/crypto/sha3"
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"github.com/ethereum/go-ethereum/rlp"
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"golang.org/x/crypto/sha3"
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"github.com/ethereum/go-ethereum/log"
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)
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var (
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secp256k1_N, _ = new(big.Int).SetString("fffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141", 16)
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secp256k1_halfN = new(big.Int).Div(secp256k1_N, big.NewInt(2))
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)
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//SignatureLength indicates the byte length required to carry a signature with recovery id.
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const SignatureLength = 64 + 1 // 64 bytes ECDSA signature + 1 byte recovery id
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// RecoveryIDOffset points to the byte offset within the signature that contains the recovery id.
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const RecoveryIDOffset = 64
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// DigestLength sets the signature digest exact length
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const DigestLength = 32
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var (
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secp256k1N, _ = new(big.Int).SetString("fffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141", 16)
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secp256k1halfN = new(big.Int).Div(secp256k1N, big.NewInt(2))
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)
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var errInvalidPubkey = errors.New("invalid secp256k1 public key")
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// Keccak256 calculates and returns the Keccak256 hash of the input data.
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func Keccak256(data ...[]byte) []byte {
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d := sha3.NewLegacyKeccak256()
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for _, b := range data {
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d.Write(b)
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}
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return d.Sum(nil)
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}
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// Keccak256Hash calculates and returns the Keccak256 hash of the input data,
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// converting it to an internal Hash data structure.
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func Keccak256Hash(data ...[]byte) (h common.Hash) {
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d := sha3.NewLegacyKeccak256()
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for _, b := range data {
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d.Write(b)
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}
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d.Sum(h[:0])
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return h
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}
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// Keccak512 calculates and returns the Keccak512 hash of the input data.
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func Keccak512(data ...[]byte) []byte {
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d := sha3.NewLegacyKeccak512()
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for _, b := range data {
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d.Write(b)
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}
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return d.Sum(nil)
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}
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// CreateAddress creates an ethereum address given the bytes and the nonce
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func CreateAddress(b common.Address, nonce uint64) common.Address {
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data, _ := rlp.EncodeToBytes([]interface{}{b, nonce})
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return common.BytesToAddress(Keccak256(data)[12:])
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}
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// CreateAddress2 creates an ethereum address given the address bytes, initial
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// contract code hash and a salt.
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func CreateAddress2(b common.Address, salt [32]byte, inithash []byte) common.Address {
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return common.BytesToAddress(Keccak256([]byte{0xff}, b.Bytes(), salt[:], inithash)[12:])
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}
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// ToECDSA creates a private key with the given D value.
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func ToECDSA(d []byte) (*ecdsa.PrivateKey, error) {
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return toECDSA(d, true)
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}
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// ToECDSAUnsafe blindly converts a binary blob to a private key. It should almost
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// never be used unless you are sure the input is valid and want to avoid hitting
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// errors due to bad origin encoding (0 prefixes cut off).
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func ToECDSAUnsafe(d []byte) *ecdsa.PrivateKey {
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priv, _ := toECDSA(d, false)
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return priv
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}
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// toECDSA creates a private key with the given D value. The strict parameter
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// controls whether the key's length should be enforced at the curve size or
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// it can also accept legacy encodings (0 prefixes).
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func toECDSA(d []byte, strict bool) (*ecdsa.PrivateKey, error) {
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priv := new(ecdsa.PrivateKey)
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priv.PublicKey.Curve = S256()
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if strict && 8*len(d) != priv.Params().BitSize {
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return nil, fmt.Errorf("invalid length, need %d bits", priv.Params().BitSize)
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}
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priv.D = new(big.Int).SetBytes(d)
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// The priv.D must < N
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if priv.D.Cmp(secp256k1N) >= 0 {
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return nil, fmt.Errorf("invalid private key, >=N")
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}
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// The priv.D must not be zero or negative.
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if priv.D.Sign() <= 0 {
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return nil, fmt.Errorf("invalid private key, zero or negative")
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}
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priv.PublicKey.X, priv.PublicKey.Y = priv.PublicKey.Curve.ScalarBaseMult(d)
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if priv.PublicKey.X == nil {
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return nil, errors.New("invalid private key")
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}
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return priv, nil
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}
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// FromECDSA exports a private key into a binary dump.
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func FromECDSA(priv *ecdsa.PrivateKey) []byte {
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if priv == nil {
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return nil
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}
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return math.PaddedBigBytes(priv.D, priv.Params().BitSize/8)
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}
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// UnmarshalPubkey converts bytes to a secp256k1 public key.
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func UnmarshalPubkey(pub []byte) (*ecdsa.PublicKey, error) {
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x, y := elliptic.Unmarshal(S256(), pub)
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if x == nil {
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return nil, errInvalidPubkey
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}
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return &ecdsa.PublicKey{Curve: S256(), X: x, Y: y}, nil
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}
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//check input error
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func ToECDSAPub(pub []byte) *ecdsa.PublicKey {
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if len(pub) != 65 {
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return nil
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}
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x, y := elliptic.Unmarshal(S256(), pub)
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if x == nil || y == nil {
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return nil
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}
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return &ecdsa.PublicKey{Curve: S256(), X: x, Y: y}
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}
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func FromECDSAPub(pub *ecdsa.PublicKey) []byte {
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if pub == nil || pub.X == nil || pub.Y == nil {
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return nil
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}
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return elliptic.Marshal(S256(), pub.X, pub.Y)
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}
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// HexToECDSA parses a secp256k1 private key.
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func HexToECDSA(hexkey string) (*ecdsa.PrivateKey, error) {
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b, err := hex.DecodeString(hexkey)
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if err != nil {
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return nil, errors.New("invalid hex string")
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}
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return ToECDSA(b)
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}
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// LoadECDSA loads a secp256k1 private key from the given file.
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func LoadECDSA(file string) (*ecdsa.PrivateKey, error) {
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buf := make([]byte, 64)
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fd, err := os.Open(file)
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if err != nil {
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return nil, err
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}
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defer fd.Close()
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if _, err := io.ReadFull(fd, buf); err != nil {
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return nil, err
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}
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key, err := hex.DecodeString(string(buf))
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if err != nil {
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return nil, err
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}
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return ToECDSA(key)
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}
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// SaveECDSA saves a secp256k1 private key to the given file with
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// restrictive permissions. The key data is saved hex-encoded.
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func SaveECDSA(file string, key *ecdsa.PrivateKey) error {
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k := hex.EncodeToString(FromECDSA(key))
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return ioutil.WriteFile(file, []byte(k), 0600)
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}
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func GenerateKey() (*ecdsa.PrivateKey, error) {
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return ecdsa.GenerateKey(S256(), rand.Reader)
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}
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// ValidateSignatureValues verifies whether the signature values are valid with
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// the given chain rules. The v value is assumed to be either 0 or 1.
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func ValidateSignatureValues(v byte, r, s *big.Int, homestead bool) bool {
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if r.Cmp(common.Big1) < 0 || s.Cmp(common.Big1) < 0 {
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return false
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}
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// reject upper range of s values (ECDSA malleability)
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// see discussion in secp256k1/libsecp256k1/include/secp256k1.h
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if homestead && s.Cmp(secp256k1halfN) > 0 {
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return false
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}
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// Frontier: allow s to be in full N range
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return r.Cmp(secp256k1N) < 0 && s.Cmp(secp256k1N) < 0 && (v == 0 || v == 1)
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}
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func PubkeyToAddress(p ecdsa.PublicKey) common.Address {
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pubBytes := FromECDSAPub(&p)
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return common.BytesToAddress(Keccak256(pubBytes[1:])[12:])
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}
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func zeroBytes(bytes []byte) {
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for i := range bytes {
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bytes[i] = 0
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}
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}
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var one = new(big.Int).SetInt64(1)
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// randFieldElement2528 returns a random element of the field
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func randFieldElement2528(rand io.Reader) (k *big.Int, err error) {
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params := S256().Params()
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b := make([]byte, params.BitSize/8+8)
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_, err = io.ReadFull(rand, b)
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if err != nil {
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return
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}
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k = new(big.Int).SetBytes(b)
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n := new(big.Int).Sub(params.N, one)
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k.Mod(k, n)
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k.Add(k, one)
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return
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}
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// calc [x]Hash(P)
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func xScalarHashP(x []byte, pub *ecdsa.PublicKey) (I *ecdsa.PublicKey) {
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KeyImg := new(ecdsa.PublicKey)
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I = new(ecdsa.PublicKey)
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KeyImg.X, KeyImg.Y = S256().ScalarMult(pub.X, pub.Y, Keccak256(FromECDSAPub(pub))) //Hash(P)
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I.X, I.Y = S256().ScalarMult(KeyImg.X, KeyImg.Y, x)
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I.Curve = S256()
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return
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}
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var (
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ErrInvalidRingSignParams = errors.New("invalid ring sign params")
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ErrRingSignFail = errors.New("ring sign fail")
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)
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// RingSign is the function of ring signature
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func RingSign(M []byte, x *big.Int, PublicKeys []*ecdsa.PublicKey) ([]*ecdsa.PublicKey, *ecdsa.PublicKey, []*big.Int, []*big.Int, error) {
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if M == nil || x == nil || len(PublicKeys) == 0 {
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return nil, nil, nil, nil, ErrInvalidRingSignParams
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}
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for _, publicKey := range PublicKeys {
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if publicKey == nil || publicKey.X == nil || publicKey.Y == nil {
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return nil, nil, nil, nil, ErrInvalidRingSignParams
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}
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}
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n := len(PublicKeys)
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I := xScalarHashP(x.Bytes(), PublicKeys[0]) //Key Image
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if I == nil || I.X == nil || I.Y == nil {
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return nil, nil, nil, nil, ErrRingSignFail
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}
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rnd, rnderr := rand.Int(rand.Reader, big.NewInt(int64(n)))
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if rnderr != nil {
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return nil, nil, nil, nil, ErrRingSignFail
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}
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s := int(rnd.Int64()) //s is the random position for real key
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if s > 0 {
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PublicKeys[0], PublicKeys[s] = PublicKeys[s], PublicKeys[0] //exchange position
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}
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var (
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q = make([]*big.Int, n)
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w = make([]*big.Int, n)
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)
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SumC := new(big.Int).SetInt64(0)
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Lpub := new(ecdsa.PublicKey)
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d := sha3.NewLegacyKeccak256()
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d.Write(M)
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var err error
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for i := 0; i < n; i++ {
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q[i], err = randFieldElement2528(rand.Reader)
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if err != nil {
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return nil, nil, nil, nil, err
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}
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w[i], err = randFieldElement2528(rand.Reader)
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if err != nil {
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return nil, nil, nil, nil, err
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}
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Lpub.X, Lpub.Y = S256().ScalarBaseMult(q[i].Bytes()) //[qi]G
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if Lpub.X == nil || Lpub.Y == nil {
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return nil, nil, nil, nil, ErrRingSignFail
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}
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if i != s {
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Ppub := new(ecdsa.PublicKey)
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Ppub.X, Ppub.Y = S256().ScalarMult(PublicKeys[i].X, PublicKeys[i].Y, w[i].Bytes()) //[wi]Pi
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if Ppub.X == nil || Ppub.Y == nil {
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return nil, nil, nil, nil, ErrRingSignFail
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}
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Lpub.X, Lpub.Y = S256().Add(Lpub.X, Lpub.Y, Ppub.X, Ppub.Y) //[qi]G+[wi]Pi
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SumC.Add(SumC, w[i])
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SumC.Mod(SumC, secp256k1_N)
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}
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d.Write(FromECDSAPub(Lpub))
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}
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Rpub := new(ecdsa.PublicKey)
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for i := 0; i < n; i++ {
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Rpub = xScalarHashP(q[i].Bytes(), PublicKeys[i]) //[qi]HashPi
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if Rpub == nil || Rpub.X == nil || Rpub.Y == nil {
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return nil, nil, nil, nil, ErrRingSignFail
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}
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if i != s {
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Ppub := new(ecdsa.PublicKey)
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Ppub.X, Ppub.Y = S256().ScalarMult(I.X, I.Y, w[i].Bytes()) //[wi]I
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if Ppub.X == nil || Ppub.Y == nil {
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return nil, nil, nil, nil, ErrRingSignFail
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}
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Rpub.X, Rpub.Y = S256().Add(Rpub.X, Rpub.Y, Ppub.X, Ppub.Y) //[qi]HashPi+[wi]I
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}
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d.Write(FromECDSAPub(Rpub))
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}
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Cs := new(big.Int).SetBytes(d.Sum(nil)) //hash(m,Li,Ri)
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Cs.Sub(Cs, SumC)
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Cs.Mod(Cs, secp256k1_N)
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tmp := new(big.Int).Mul(Cs, x)
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Rs := new(big.Int).Sub(q[s], tmp)
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Rs.Mod(Rs, secp256k1_N)
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w[s] = Cs
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q[s] = Rs
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return PublicKeys, I, w, q, nil
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}
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// VerifyRingSign verifies the validity of ring signature
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func VerifyRingSign(M []byte, PublicKeys []*ecdsa.PublicKey, I *ecdsa.PublicKey, c []*big.Int, r []*big.Int) bool {
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if M == nil || PublicKeys == nil || I == nil || c == nil || r == nil {
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return false
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}
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if len(PublicKeys) == 0 || len(PublicKeys) != len(c) || len(PublicKeys) != len(r) {
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return false
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}
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n := len(PublicKeys)
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for i := 0; i < n; i++ {
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if PublicKeys[i] == nil || PublicKeys[i].X == nil || PublicKeys[i].Y == nil ||
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c[i] == nil || r[i] == nil {
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return false
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}
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}
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log.Debug("M info", "R", 0, "M", common.ToHex(M))
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for i := 0; i < n; i++ {
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log.Debug("publicKeys", "i", i, "publickey", common.ToHex(FromECDSAPub(PublicKeys[i])))
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}
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log.Debug("image info", "I", common.ToHex(FromECDSAPub(I)))
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for i := 0; i < n; i++ {
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log.Debug("c info", "i", i, "c", common.ToHex(c[i].Bytes()))
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}
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for i := 0; i < n; i++ {
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log.Debug("r info", "i", i, "r", common.ToHex(r[i].Bytes()))
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}
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SumC := new(big.Int).SetInt64(0)
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Lpub := new(ecdsa.PublicKey)
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d := sha3.NewLegacyKeccak256()
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d.Write(M)
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//hash(M,Li,Ri)
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for i := 0; i < n; i++ {
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Lpub.X, Lpub.Y = S256().ScalarBaseMult(r[i].Bytes()) //[ri]G
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if Lpub.X == nil || Lpub.Y == nil {
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return false
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}
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Ppub := new(ecdsa.PublicKey)
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Ppub.X, Ppub.Y = S256().ScalarMult(PublicKeys[i].X, PublicKeys[i].Y, c[i].Bytes()) //[ci]Pi
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if Ppub.X == nil || Ppub.Y == nil {
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return false
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}
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Lpub.X, Lpub.Y = S256().Add(Lpub.X, Lpub.Y, Ppub.X, Ppub.Y) //[ri]G+[ci]Pi
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SumC.Add(SumC, c[i])
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SumC.Mod(SumC, secp256k1_N)
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d.Write(FromECDSAPub(Lpub))
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log.Debug("LPublicKeys", "i", i, "Lpub", common.ToHex(FromECDSAPub(Lpub)))
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}
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Rpub := new(ecdsa.PublicKey)
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for i := 0; i < n; i++ {
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Rpub = xScalarHashP(r[i].Bytes(), PublicKeys[i]) //[qi]HashPi
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if Rpub == nil || Rpub.X == nil || Rpub.Y == nil {
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return false
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}
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Ppub := new(ecdsa.PublicKey)
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Ppub.X, Ppub.Y = S256().ScalarMult(I.X, I.Y, c[i].Bytes()) //[wi]I
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if Ppub.X == nil || Ppub.Y == nil {
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return false
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}
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Rpub.X, Rpub.Y = S256().Add(Rpub.X, Rpub.Y, Ppub.X, Ppub.Y) //[qi]HashPi+[wi]I
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log.Debug("RPublicKeys", "i", i, "Rpub", common.ToHex(FromECDSAPub(Rpub)))
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d.Write(FromECDSAPub(Rpub))
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}
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hash := new(big.Int).SetBytes(d.Sum(nil)) //hash(m,Li,Ri)
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log.Debug("hash info", "i", 0, "hash", common.ToHex(hash.Bytes()))
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hash.Mod(hash, secp256k1_N)
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log.Debug("hash info", "i", 2, "hash", common.ToHex(hash.Bytes()))
|
|
log.Debug("SumC info", "i", 3, "SumC", common.ToHex(SumC.Bytes()))
|
|
|
|
return hash.Cmp(SumC) == 0
|
|
}
|
|
|
|
// A1=[hash([r]B)]G+A
|
|
func generateA1(r []byte, A *ecdsa.PublicKey, B *ecdsa.PublicKey) ecdsa.PublicKey {
|
|
A1 := new(ecdsa.PublicKey)
|
|
A1.X, A1.Y = S256().ScalarMult(B.X, B.Y, r) //A1=[r]B
|
|
A1Bytes := Keccak256(FromECDSAPub(A1)) //hash([r]B)
|
|
A1.X, A1.Y = S256().ScalarBaseMult(A1Bytes) //[hash([r]B)]G
|
|
A1.X, A1.Y = S256().Add(A1.X, A1.Y, A.X, A.Y) //A1=[hash([r]B)]G+A
|
|
A1.Curve = S256()
|
|
return *A1
|
|
}
|
|
|
|
func CompareA1(b []byte, A *ecdsa.PublicKey, S1 *ecdsa.PublicKey, A1 *ecdsa.PublicKey) bool {
|
|
A1n := generateA1(b, A, S1)
|
|
if A1.X.Cmp(A1n.X) == 0 && A1.Y.Cmp(A1n.Y) == 0 {
|
|
return true
|
|
}
|
|
return false
|
|
}
|
|
|
|
// generateOneTimeKey2528 generates an OTA account for receiver using receiver's publickey
|
|
func generateOneTimeKey2528(A *ecdsa.PublicKey, B *ecdsa.PublicKey) (A1 *ecdsa.PublicKey, R *ecdsa.PublicKey, err error) {
|
|
RPrivateKey, err := GenerateKey()
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
R = &RPrivateKey.PublicKey
|
|
A1 = new(ecdsa.PublicKey)
|
|
*A1 = generateA1(RPrivateKey.D.Bytes(), A, B)
|
|
return A1, R, err
|
|
}
|
|
|
|
// Generate OTA account interface
|
|
func GenerateOneTimeKey(AX string, AY string, BX string, BY string) (ret []string, err error) {
|
|
bytesAX, err := hexutil.Decode(AX)
|
|
if err != nil {
|
|
return
|
|
}
|
|
bytesAY, err := hexutil.Decode(AY)
|
|
if err != nil {
|
|
return
|
|
}
|
|
bytesBX, err := hexutil.Decode(BX)
|
|
if err != nil {
|
|
return
|
|
}
|
|
bytesBY, err := hexutil.Decode(BY)
|
|
if err != nil {
|
|
return
|
|
}
|
|
bnAX := new(big.Int).SetBytes(bytesAX)
|
|
bnAY := new(big.Int).SetBytes(bytesAY)
|
|
bnBX := new(big.Int).SetBytes(bytesBX)
|
|
bnBY := new(big.Int).SetBytes(bytesBY)
|
|
|
|
pa := &ecdsa.PublicKey{X: bnAX, Y: bnAY}
|
|
pb := &ecdsa.PublicKey{X: bnBX, Y: bnBY}
|
|
|
|
generatedA1, generatedR, err := generateOneTimeKey2528(pa, pb)
|
|
return hexutil.PKPair2HexSlice(generatedA1, generatedR), nil
|
|
}
|
|
|
|
// GenerteOTAPrivateKey generates the privatekey for an OTA account using receiver's main account's privatekey
|
|
func GenerteOTAPrivateKey(privateKey *ecdsa.PrivateKey, privateKey2 *ecdsa.PrivateKey, AX string, AY string, BX string, BY string) (retPub *ecdsa.PublicKey, retPriv1 *ecdsa.PrivateKey, retPriv2 *ecdsa.PrivateKey, err error) {
|
|
bytesAX, err := hexutil.Decode(AX)
|
|
if err != nil {
|
|
return
|
|
}
|
|
bytesAY, err := hexutil.Decode(AY)
|
|
if err != nil {
|
|
return
|
|
}
|
|
bytesBX, err := hexutil.Decode(BX)
|
|
if err != nil {
|
|
return
|
|
}
|
|
bytesBY, err := hexutil.Decode(BY)
|
|
if err != nil {
|
|
return
|
|
}
|
|
bnAX := new(big.Int).SetBytes(bytesAX)
|
|
bnAY := new(big.Int).SetBytes(bytesAY)
|
|
bnBX := new(big.Int).SetBytes(bytesBX)
|
|
bnBY := new(big.Int).SetBytes(bytesBY)
|
|
|
|
retPub = &ecdsa.PublicKey{X: bnAX, Y: bnAY}
|
|
pb := &ecdsa.PublicKey{X: bnBX, Y: bnBY}
|
|
retPriv1, retPriv2, err = GenerateOneTimePrivateKey2528(privateKey, privateKey2, retPub, pb)
|
|
return
|
|
}
|
|
|
|
func GenerateOneTimePrivateKey2528(privateKey *ecdsa.PrivateKey, privateKey2 *ecdsa.PrivateKey, destPubA *ecdsa.PublicKey, destPubB *ecdsa.PublicKey) (retPriv1 *ecdsa.PrivateKey, retPriv2 *ecdsa.PrivateKey, err error) {
|
|
pub := new(ecdsa.PublicKey)
|
|
pub.X, pub.Y = S256().ScalarMult(destPubB.X, destPubB.Y, privateKey2.D.Bytes()) //[b]R
|
|
k := new(big.Int).SetBytes(Keccak256(FromECDSAPub(pub))) //hash([b]R)
|
|
k.Add(k, privateKey.D) //hash([b]R)+a
|
|
k.Mod(k, S256().Params().N) //mod to feild N
|
|
|
|
retPriv1 = new(ecdsa.PrivateKey)
|
|
retPriv2 = new(ecdsa.PrivateKey)
|
|
|
|
retPriv1.D = k
|
|
retPriv2.D = new(big.Int).SetInt64(0)
|
|
return retPriv1, retPriv2, nil
|
|
}
|