/
signature.go
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/
signature.go
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// Copyright 2017~2022 The Bottos Authors
// This file is part of the Bottos Chain library.
// Created by Rocket Core Team of Bottos.
//This program is free software: you can distribute it and/or modify
//it under the terms of the GNU General Public License as published by
//the Free Software Foundation, either version 3 of the License, or
//(at your option) any later version.
//This program 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 General Public License for more details.
//You should have received a copy of the GNU General Public License
// along with bottos. If not, see <http://www.gnu.org/licenses/>.
/*
* file description: signature
* @Author:
* @Date: 2017-12-06
* @Last Modified by:
* @Last Modified time:
*/
package crypto
import (
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"math/big"
secp256k1 "github.com/bottos-project/crypto-go/crypto/secp256k1"
)
func GenerateKey() (pubkey, seckey []byte) {
key, err := ecdsa.GenerateKey(secp256k1.S256(), rand.Reader)
if err != nil {
panic(err)
}
return elliptic.Marshal(secp256k1.S256(), key.X, key.Y), PaddedBigBytes(key.D, 32)
}
func Sign(msg, seckey []byte) ([]byte, error) {
sign, err := secp256k1.Sign(msg, seckey)
return sign[:len(sign)-1], err
}
func VerifySign(pubkey, msg, sign []byte) bool {
return secp256k1.VerifySignature(pubkey, msg, sign)
}
func PaddedBigBytes(bigint *big.Int, n int) []byte {
if bigint.BitLen()/8 >= n {
return bigint.Bytes()
}
ret := make([]byte, n)
secp256k1.ReadBits(bigint, ret)
return ret
}