github.com/gobitfly/go-ethereum@v1.8.12/swarm/storage/mru/resource_sign.go (about)

     1  // Copyright 2018 The go-ethereum Authors
     2  // This file is part of the go-ethereum library.
     3  //
     4  // The go-ethereum library is free software: you can redistribute it and/or modify
     5  // it under the terms of the GNU Lesser General Public License as published by
     6  // the Free Software Foundation, either version 3 of the License, or
     7  // (at your option) any later version.
     8  //
     9  // The go-ethereum library is distributed in the hope that it will be useful,
    10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    12  // GNU Lesser General Public License for more details.
    13  //
    14  // You should have received a copy of the GNU Lesser General Public License
    15  // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  package mru
    18  
    19  import (
    20  	"crypto/ecdsa"
    21  
    22  	"github.com/ethereum/go-ethereum/common"
    23  	"github.com/ethereum/go-ethereum/crypto"
    24  )
    25  
    26  // Signs resource updates
    27  type Signer interface {
    28  	Sign(common.Hash) (Signature, error)
    29  }
    30  
    31  type GenericSigner struct {
    32  	PrivKey *ecdsa.PrivateKey
    33  }
    34  
    35  func (self *GenericSigner) Sign(data common.Hash) (signature Signature, err error) {
    36  	signaturebytes, err := crypto.Sign(data.Bytes(), self.PrivKey)
    37  	if err != nil {
    38  		return
    39  	}
    40  	copy(signature[:], signaturebytes)
    41  	return
    42  }