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crypto.go
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crypto.go
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// Copyright 2018 DREP Foundation Ltd.
// This file is part of the drep-cli library.
//
// The drep-cli 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 drep-cli 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 drep-cli library. If not, see <http://www.gnu.org/licenses/>.
package crypto
import (
"crypto/ecdsa"
"encoding/binary"
"encoding/hex"
"errors"
"fmt"
"io"
"io/ioutil"
"math/big"
"os"
"github.com/drep-project/DREP-Chain/common"
"github.com/drep-project/DREP-Chain/crypto/secp256k1"
"github.com/drep-project/DREP-Chain/crypto/sha3"
)
var (
secp256k1N, _ = new(big.Int).SetString("fffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141", 16)
secp256k1halfN = new(big.Int).Div(secp256k1N, big.NewInt(2))
errInvalidPubkey = errors.New("invalid secp256k1 public key")
)
// Keccak256Hash calculates and returns the Keccak256 hash of the input data,
// converting it to an internal Hash data structure.
func Keccak256Hash(data ...[]byte) (h Hash) {
d := sha3.NewKeccak256()
for _, b := range data {
d.Write(b)
}
d.Sum(h[:0])
return h
}
// CreateAddress creates an ethereum address given the bytes and the nonce
func CreateAddress(b CommonAddress, nonce uint64) CommonAddress {
var buf = make([]byte, 8)
binary.BigEndian.PutUint64(buf, nonce)
data := append(b.Bytes(), buf...)
return BytesToAddress(sha3.Keccak256(data)[12:])
}
// LoadECDSA loads a secp256k1 private key from the given file.
func LoadECDSA(file string) (*secp256k1.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 secp256k1.NewPrivateKey(new(big.Int).SetBytes(key)), nil
}
// 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 *secp256k1.PrivateKey) error {
k := hex.EncodeToString(key.Serialize())
return ioutil.WriteFile(file, []byte(k), 0600)
}
// Generate an elliptic curve public / private keypair. If params is nil,
// the recommended default parameters for the key will be chosen.
func GenerateKey(rand io.Reader) (prv *secp256k1.PrivateKey, err error) {
key, err := ecdsa.GenerateKey(secp256k1.S256(), rand)
if err != nil {
return nil, err
}
return (*secp256k1.PrivateKey)(key), nil
}
//func PubkeyToAddress(p *secp256k1.PublicKey) CommonAddress {
// return Bytes2Address(Keccak256(p.Serialize()[1:])[12:])
//}
func zeroBytes(bytes []byte) {
for i := range bytes {
bytes[i] = 0
}
}
// 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, homestead bool) bool {
if r.Cmp(common.Big1) < 0 || s.Cmp(common.Big1) < 0 {
return false
}
//TODO homestead is ok
// reject upper range of s values (ECDSA malleability)
// see discussion in secp256k1/libsecp256k1/include/secp256k1.h
if homestead && 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)
}
// ToECDSA creates a private key with the given D value.
func ToPrivateKey(d []byte) (*secp256k1.PrivateKey, error) {
return toPrivateKey(d, true)
}
// 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 toPrivateKey(d []byte, strict bool) (*secp256k1.PrivateKey, error) {
priv := new(secp256k1.PrivateKey)
priv.PublicKey.Curve = secp256k1.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
}