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key.go
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key.go
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/**
* @Author: fuxiao
* @Email: 576101059@qq.com
* @Date: 2022/11/1 12:50 上午
* @Desc: TODO
*/
package ecc
import (
"bytes"
"crypto/ecdsa"
"crypto/rand"
"crypto/x509"
"encoding/pem"
"github.com/dobyte/due/errors"
"github.com/dobyte/due/utils/xconv"
"github.com/dobyte/due/utils/xpath"
"github.com/ethereum/go-ethereum/crypto/ecies"
"io"
"io/ioutil"
"os"
"path"
)
type Key struct {
prv *ecdsa.PrivateKey
}
// GenerateKey 生成秘钥
func GenerateKey(curve Curve) (*Key, error) {
prv, err := ecdsa.GenerateKey(curve.New(), rand.Reader)
if err != nil {
return nil, err
}
return &Key{prv: prv}, nil
}
// PublicKey 获取公钥
func (k *Key) PublicKey() *ecdsa.PublicKey {
return &k.prv.PublicKey
}
// PrivateKey 获取私钥
func (k *Key) PrivateKey() *ecdsa.PrivateKey {
return k.prv
}
// MarshalPublicKey 编码公钥
func (k *Key) MarshalPublicKey() ([]byte, error) {
buf := bytes.NewBuffer(nil)
err := k.marshalPublicKey(buf)
if err != nil {
return nil, err
}
return buf.Bytes(), nil
}
// 编码私钥
func (k *Key) marshalPublicKey(out io.Writer) error {
derText, err := x509.MarshalPKIXPublicKey(k.PublicKey())
if err != nil {
return err
}
return pem.Encode(out, &pem.Block{
Type: "ECDSA PUBLIC KEY",
Bytes: derText,
})
}
// MarshalPrivateKey 编码私钥
func (k *Key) MarshalPrivateKey() ([]byte, error) {
buf := bytes.NewBuffer(nil)
err := k.marshalPrivateKey(buf)
if err != nil {
return nil, err
}
return buf.Bytes(), nil
}
// 编码私钥
func (k *Key) marshalPrivateKey(out io.Writer) error {
derText, err := x509.MarshalECPrivateKey(k.PrivateKey())
if err != nil {
return err
}
return pem.Encode(out, &pem.Block{
Type: "ECDSA PRIVATE KEY",
Bytes: derText,
})
}
// SaveKeyPair 保存秘钥对
func (k *Key) SaveKeyPair(dir string, file string) (err error) {
if !xpath.IsDir(dir) {
err = os.MkdirAll(dir, os.ModePerm)
if err != nil {
return
}
}
err = k.savePublicKey(dir, file)
if err != nil {
return
}
return k.savePrivateKey(dir, file)
}
// 保存公钥
func (k *Key) savePrivateKey(dir string, file string) (err error) {
filepath := path.Join(dir, file)
defer func() {
if err != nil {
_ = os.Remove(filepath)
}
}()
f, err := os.Create(filepath)
if err != nil {
return
}
return k.marshalPrivateKey(f)
}
// 保存公钥
func (k *Key) savePublicKey(dir string, file string) (err error) {
base, _, name, ext := xpath.Split(file)
if ext != "" {
file = name + ".pub." + ext
} else {
file = name + ".pub"
}
filepath := path.Join(dir, base, file)
defer func() {
if err != nil {
_ = os.Remove(filepath)
}
}()
f, err := os.Create(filepath)
if err != nil {
return
}
return k.marshalPublicKey(f)
}
func loadKey(key string) (*pem.Block, error) {
var (
err error
buffer []byte
)
if xpath.IsFile(key) {
buffer, err = ioutil.ReadFile(key)
if err != nil {
return nil, err
}
} else {
buffer = xconv.StringToBytes(key)
}
block, _ := pem.Decode(buffer)
return block, nil
}
func parseECIESPublicKey(publicKey string) (*ecies.PublicKey, error) {
pub, err := parseECDSAPublicKey(publicKey)
if err != nil {
return nil, err
}
return ecies.ImportECDSAPublic(pub), nil
}
func parseECIESPrivateKey(privateKey string) (*ecies.PrivateKey, error) {
prv, err := parseECDSAPrivateKey(privateKey)
if err != nil {
return nil, err
}
return ecies.ImportECDSA(prv), nil
}
func parseECDSAPublicKey(publicKey string) (*ecdsa.PublicKey, error) {
black, err := loadKey(publicKey)
if err != nil {
return nil, err
}
if black == nil {
return nil, errors.New("invalid public key")
}
pub, err := x509.ParsePKIXPublicKey(black.Bytes)
if err != nil {
return nil, err
}
switch key := pub.(type) {
case *ecdsa.PublicKey:
return key, nil
default:
return nil, errors.New("invalid public key")
}
}
func parseECDSAPrivateKey(privateKey string) (*ecdsa.PrivateKey, error) {
black, err := loadKey(privateKey)
if err != nil {
return nil, err
}
if black == nil {
return nil, errors.New("invalid private key")
}
return x509.ParseECPrivateKey(black.Bytes)
}