mirror of
https://github.com/ethereum/go-ethereum.git
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52 lines
1.6 KiB
Go
52 lines
1.6 KiB
Go
// Copyright 2016 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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// +build !nacl,!javascript,!nocgo
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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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"fmt"
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"github.com/btcsuite/btcd/btcec"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/crypto/secp256k1"
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)
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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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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(btcec.S256(), s)
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return &ecdsa.PublicKey{Curve: btcec.S256(), X: x, Y: y}, nil
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}
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func Sign(hash []byte, prv *ecdsa.PrivateKey) (sig []byte, err error) {
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if len(hash) != 32 {
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return nil, fmt.Errorf("hash is required to be exactly 32 bytes (%d)", len(hash))
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}
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seckey := common.LeftPadBytes(prv.D.Bytes(), prv.Params().BitSize/8)
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defer zeroBytes(seckey)
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return secp256k1.Sign(hash, seckey)
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}
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