238 lines
7.1 KiB
Go
238 lines
7.1 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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"golang.org/x/crypto/sha3"
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"github.com/ethereum/go-ethereum/common/math"
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"github.com/ethereum/go-ethereum/crypto/secp256k1"
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"github.com/ethereum/go-ethereum/rlp"
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"github.com/status-im/status-go/eth-node/types"
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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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)
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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 types.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 types.Address, nonce uint64) types.Address {
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data, _ := rlp.EncodeToBytes([]interface{}{b, nonce})
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return types.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 types.Address, salt [32]byte, inithash []byte) types.Address {
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return types.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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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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func PubkeyToAddress(p ecdsa.PublicKey) types.Address {
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pubBytes := FromECDSAPub(&p)
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return types.BytesToAddress(Keccak256(pubBytes[1:])[12:])
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}
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// Ecrecover returns the uncompressed public key that created the given signature.
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func Ecrecover(hash, sig []byte) ([]byte, error) {
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return secp256k1.RecoverPubkey(hash, sig)
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}
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// SigToPub returns the public key that created the given signature.
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func SigToPub(hash, sig []byte) (*ecdsa.PublicKey, error) {
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s, err := Ecrecover(hash, sig)
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if err != nil {
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return nil, err
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}
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x, y := elliptic.Unmarshal(S256(), s)
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return &ecdsa.PublicKey{Curve: S256(), X: x, Y: y}, nil
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}
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// DecompressPubkey parses a public key in the 33-byte compressed format.
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func DecompressPubkey(pubkey []byte) (*ecdsa.PublicKey, error) {
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x, y := secp256k1.DecompressPubkey(pubkey)
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if x == nil {
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return nil, fmt.Errorf("invalid public key")
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}
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return &ecdsa.PublicKey{X: x, Y: y, Curve: S256()}, nil
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}
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// CompressPubkey encodes a public key to the 33-byte compressed format.
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func CompressPubkey(pubkey *ecdsa.PublicKey) []byte {
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return secp256k1.CompressPubkey(pubkey.X, pubkey.Y)
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}
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// S256 returns an instance of the secp256k1 curve.
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func S256() elliptic.Curve {
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return secp256k1.S256()
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}
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