/
sm2.go
179 lines (144 loc) · 4.87 KB
/
sm2.go
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package gm
import (
"crypto/elliptic"
"crypto/rand"
"encoding/asn1"
"errors"
"fmt"
"math/big"
"github.com/littlegirlpppp/fabric-sdk-go-gm/internal/github.com/hyperledger/fabric/bccsp"
//todo:国密 gosdk:sm2
"github.com/littlegirlpppp/fabric-sdk-go-gm/third_party/github.com/tjfoc/gmsm/sm2"
)
//todo:国密 gosdk:增加gm
type SM2Signature struct {
R, S *big.Int
}
var (
// curveHalfOrders contains the precomputed curve group orders halved.
// It is used to ensure that signature' S value is lower or equal to the
// curve group order halved. We accept only low-S signatures.
// They are precomputed for efficiency reasons.
curveHalfOrders map[elliptic.Curve]*big.Int = map[elliptic.Curve]*big.Int{
elliptic.P224(): new(big.Int).Rsh(elliptic.P224().Params().N, 1),
elliptic.P256(): new(big.Int).Rsh(elliptic.P256().Params().N, 1),
elliptic.P384(): new(big.Int).Rsh(elliptic.P384().Params().N, 1),
elliptic.P521(): new(big.Int).Rsh(elliptic.P521().Params().N, 1),
sm2.P256Sm2(): new(big.Int).Rsh(sm2.P256Sm2().Params().N, 1),
}
)
func MarshalSM2Signature(r, s *big.Int) ([]byte, error) {
return asn1.Marshal(SM2Signature{r, s})
}
func UnmarshalSM2Signature(raw []byte) (*big.Int, *big.Int, error) {
// Unmarshal
sig := new(SM2Signature)
_, err := asn1.Unmarshal(raw, sig)
if err != nil {
return nil, nil, fmt.Errorf("Failed unmashalling signature [%s]", err)
}
// Validate sig
if sig.R == nil {
return nil, nil, errors.New("Invalid signature. R must be different from nil.")
}
if sig.S == nil {
return nil, nil, errors.New("Invalid signature. S must be different from nil.")
}
if sig.R.Sign() != 1 {
return nil, nil, errors.New("Invalid signature. R must be larger than zero")
}
if sig.S.Sign() != 1 {
return nil, nil, errors.New("Invalid signature. S must be larger than zero")
}
return sig.R, sig.S, nil
}
func signGMSM2(k *sm2.PrivateKey, digest []byte, opts bccsp.SignerOpts) (signature []byte, err error) {
signature, err = k.Sign(rand.Reader, digest, opts)
return
}
func verifyGMSM2(k *sm2.PublicKey, signature, digest []byte, opts bccsp.SignerOpts) (valid bool, err error) {
valid = k.Verify(digest, signature)
return
}
type gmsm2Signer struct{}
func (s *gmsm2Signer) Sign(k bccsp.Key, digest []byte, opts bccsp.SignerOpts) (signature []byte, err error) {
return signGMSM2(k.(*gmsm2PrivateKey).privKey, digest, opts)
}
type ecdsaPrivateKeySigner struct{}
func (s *ecdsaPrivateKeySigner) Sign(k bccsp.Key, digest []byte, opts bccsp.SignerOpts) (signature []byte, err error) {
puk := k.(*ecdsaPrivateKey).privKey.PublicKey
sm2pk := sm2.PublicKey{
Curve: puk.Curve,
X: puk.X,
Y: puk.Y,
}
privKey := k.(*ecdsaPrivateKey).privKey
sm2privKey := sm2.PrivateKey{
D: privKey.D,
PublicKey: sm2pk,
}
return signGMSM2(&sm2privKey, digest, opts)
}
type gmsm2PrivateKeyVerifier struct{}
func (v *gmsm2PrivateKeyVerifier) Verify(k bccsp.Key, signature, digest []byte, opts bccsp.SignerOpts) (valid bool, err error) {
return verifyGMSM2(&(k.(*gmsm2PrivateKey).privKey.PublicKey), signature, digest, opts)
}
type gmsm2PublicKeyKeyVerifier struct{}
func (v *gmsm2PublicKeyKeyVerifier) Verify(k bccsp.Key, signature, digest []byte, opts bccsp.SignerOpts) (valid bool, err error) {
return verifyGMSM2(k.(*gmsm2PublicKey).pubKey, signature, digest, opts)
}
type ecdsaPrivateKeyVerifier struct{}
func (v *ecdsaPrivateKeyVerifier) Verify(k bccsp.Key, signature, digest []byte, opts bccsp.SignerOpts) (valid bool, err error) {
puk := k.(*ecdsaPrivateKey).privKey.PublicKey
sm2pk := sm2.PublicKey{
Curve: puk.Curve,
X: puk.X,
Y: puk.Y,
}
return verifyGMSM2(&sm2pk, signature, digest, opts)
}
type ecdsaPublicKeyKeyVerifier struct{}
func (v *ecdsaPublicKeyKeyVerifier) Verify(k bccsp.Key, signature, digest []byte, opts bccsp.SignerOpts) (valid bool, err error) {
puk := k.(*ecdsaPublicKey).pubKey
sm2pk := sm2.PublicKey{
Curve: puk.Curve,
X: puk.X,
Y: puk.Y,
}
return verifyGMSM2(&sm2pk, signature, digest, opts)
}
func SignatureToLowS(k *sm2.PublicKey, signature []byte) ([]byte, error) {
r, s, err := UnmarshalSM2Signature(signature)
if err != nil {
return nil, err
}
s, modified, err := ToLowS(k, s)
if err != nil {
return nil, err
}
if modified {
return MarshalSM2Signature(r, s)
}
return signature, nil
}
func ToLowS(k *sm2.PublicKey, s *big.Int) (*big.Int, bool, error) {
lowS, err := IsLowS(k, s)
if err != nil {
return nil, false, err
}
if !lowS && k.Curve != sm2.P256Sm2() {
// Set s to N - s that will be then in the lower part of signature space
// less or equal to half order
s.Sub(k.Params().N, s)
return s, true, nil
}
return s, false, nil
}
// IsLow checks that s is a low-S
func IsLowS(k *sm2.PublicKey, s *big.Int) (bool, error) {
halfOrder, ok := curveHalfOrders[k.Curve]
if !ok {
return false, fmt.Errorf("Curve not recognized [%s]", k.Curve)
}
return s.Cmp(halfOrder) != 1, nil
}