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ecdsa.go
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ecdsa.go
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// Copyright Fuzamei Corp. 2018 All Rights Reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package csp
import (
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"encoding/asn1"
"fmt"
"math/big"
auth "github.com/GM-Publicchain/gm/plugin/crypto/ecdsa"
)
type ecdsaSigner struct{}
func (s *ecdsaSigner) Sign(k Key, digest []byte, opts SignerOpts) (signature []byte, err error) {
return signECDSA(k.(*ecdsaPrivateKey).privKey, digest, opts)
}
func signECDSA(k *ecdsa.PrivateKey, digest []byte, opts SignerOpts) (signature []byte, err error) {
r, s, err := ecdsa.Sign(rand.Reader, k, digest)
if err != nil {
return nil, err
}
s = auth.ToLowS(&k.PublicKey, s)
return MarshalECDSASignature(r, s)
}
// ECDSASignature ECDSA签名结构
type ECDSASignature struct {
R, S *big.Int
}
// MarshalECDSASignature 编码ECDSA类型签名
func MarshalECDSASignature(r, s *big.Int) ([]byte, error) {
return asn1.Marshal(ECDSASignature{r, s})
}
type ecdsaKeyGenerator struct {
curve elliptic.Curve
}
func (kg *ecdsaKeyGenerator) KeyGen(opts int) (k Key, err error) {
privKey, err := ecdsa.GenerateKey(kg.curve, rand.Reader)
if err != nil {
return nil, fmt.Errorf("Failed generating ECDSA key for [%v]: [%s]", kg.curve, err)
}
return &ecdsaPrivateKey{privKey}, nil
}