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/*
Copyright (C) BABEC. All rights reserved.
Copyright (C) THL A29 Limited, a Tencent company. All rights reserved.
SPDX-License-Identifier: Apache-2.0
*/
package ecdsa
import (
"bytes"
crypto2 "crypto"
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"crypto/x509"
"encoding/asn1"
"encoding/hex"
"encoding/pem"
"errors"
"fmt"
"math/big"
"chainmaker.org/chainmaker/common/v2/crypto"
"chainmaker.org/chainmaker/common/v2/crypto/hash"
"github.com/btcsuite/btcd/btcec"
"github.com/tjfoc/gmsm/sm2"
)
type PrivateKey struct {
K crypto2.PrivateKey
}
type Sig struct {
R *big.Int `json:"r"`
S *big.Int `json:"s"`
}
func (sk *PrivateKey) Bytes() ([]byte, error) {
if sk.K == nil {
return nil, fmt.Errorf("private key is nil")
}
key := sk.K
switch key := key.(type) {
case *ecdsa.PrivateKey:
if sk.Type() == crypto.ECC_Secp256k1 {
rawKey := (*btcec.PrivateKey)(key).Serialize()
return rawKey, nil
} else {
return x509.MarshalECPrivateKey(key)
}
case *sm2.PrivateKey:
return MarshalPKCS8PrivateKey(key)
}
return nil, errors.New("unsupport private key")
}
func (sk *PrivateKey) PublicKey() crypto.PublicKey {
key := sk.K
switch key := key.(type) {
case *ecdsa.PrivateKey:
return &PublicKey{K: &key.PublicKey}
case *sm2.PrivateKey:
return &PublicKey{K: &key.PublicKey}
}
return nil
}
func (sk *PrivateKey) Sign(digest []byte) ([]byte, error) {
var (
r, s *big.Int
err error
)
key := sk.K
switch key := key.(type) {
case *ecdsa.PrivateKey:
r, s, err = ecdsa.Sign(rand.Reader, key, digest[:])
case *sm2.PrivateKey:
r, s, err = sm2.Sign(key, digest[:])
}
if err != nil {
return nil, err
}
return asn1.Marshal(Sig{R: r, S: s})
}
func (sk *PrivateKey) SignWithOpts(msg []byte, opts *crypto.SignOpts) ([]byte, error) {
if opts == nil {
return sk.Sign(msg)
}
if opts.Hash == crypto.HASH_TYPE_SM3 && sk.Type() == crypto.SM2 {
skSM2, ok := sk.K.(*sm2.PrivateKey)
if !ok {
return nil, fmt.Errorf("SM2 private key does not match the type it claims")
}
uid := opts.UID
if len(uid) == 0 {
uid = crypto.CRYPTO_DEFAULT_UID
}
r, s, err := sm2.Sm2Sign(skSM2, msg, []byte(uid))
if err != nil {
return nil, fmt.Errorf("fail to sign with SM2-SM3: [%v]", err)
}
return asn1.Marshal(Sig{R: r, S: s})
} else {
dgst, err := hash.Get(opts.Hash, msg)
if err != nil {
return nil, err
}
return sk.Sign(dgst)
}
}
func (sk *PrivateKey) Type() crypto.KeyType {
return sk.PublicKey().Type()
}
func (sk *PrivateKey) String() (string, error) {
skDER, err := sk.Bytes()
if err != nil {
return "", err
}
if sk.Type() == crypto.ECC_Secp256k1 {
return hex.EncodeToString(skDER), nil
}
block := &pem.Block{
Type: "EC PRIVATE KEY",
Bytes: skDER,
}
switch sk.K.(type) {
case *sm2.PrivateKey:
block.Type = "PRIVATE KEY"
}
buf := new(bytes.Buffer)
if err = pem.Encode(buf, block); err != nil {
return "", err
}
return buf.String(), nil
}
func (sk *PrivateKey) ToStandardKey() crypto2.PrivateKey {
return sk.K
}
func New(keyType crypto.KeyType) (crypto.PrivateKey, error) {
switch keyType {
case crypto.ECC_Secp256k1:
pri, err := ecdsa.GenerateKey(btcec.S256(), rand.Reader)
if err != nil {
return nil, err
}
return &PrivateKey{K: pri}, nil
case crypto.ECC_NISTP256:
pri, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
if err != nil {
return nil, err
}
return &PrivateKey{K: pri}, nil
case crypto.ECC_NISTP384:
pri, err := ecdsa.GenerateKey(elliptic.P384(), rand.Reader)
if err != nil {
return nil, err
}
return &PrivateKey{K: pri}, nil
case crypto.ECC_NISTP521:
pri, err := ecdsa.GenerateKey(elliptic.P521(), rand.Reader)
if err != nil {
return nil, err
}
return &PrivateKey{K: pri}, nil
case crypto.SM2:
pri, err := sm2.GenerateKey()
if err != nil {
return nil, err
}
return &PrivateKey{K: pri}, nil
}
return nil, fmt.Errorf("wrong curve option")
}