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key_pkcs8.go
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key_pkcs8.go
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package sm9
import (
"errors"
"reflect"
"math/big"
"encoding/asn1"
"crypto/x509/pkix"
"golang.org/x/crypto/cryptobyte"
cryptobyte_asn1 "golang.org/x/crypto/cryptobyte/asn1"
)
var (
oidSM9 = asn1.ObjectIdentifier{1, 2, 156, 10197, 1, 302}
oidSM9Sign = asn1.ObjectIdentifier{1, 2, 156, 10197, 1, 302, 1}
oidSM9Enc = asn1.ObjectIdentifier{1, 2, 156, 10197, 1, 302, 3}
)
// pkcs8
type pkcs8 struct {
Version int
Algo pkix.AlgorithmIdentifier
PrivateKey []byte
Attributes []asn1.RawValue `asn1:"optional,tag:0"`
}
// pkcs8 attribute info
type pkcs8Attribute struct {
Id asn1.ObjectIdentifier
Values []asn1.RawValue `asn1:"set"`
}
type sm9PrivateKey struct {
PrivateKey asn1.RawValue
PublicKey asn1.RawValue
}
// pkixPublicKey reflects a PKIX public key structure. See SubjectPublicKeyInfo
// in RFC 3280.
type pkixPublicKey struct {
Algo pkix.AlgorithmIdentifier
BitString asn1.BitString
}
func ParsePublicKey(der []byte) (key any, err error) {
var pubkey pkixPublicKey
if _, err := asn1.Unmarshal(der, &pubkey); err != nil {
return nil, err
}
if !reflect.DeepEqual(pubkey.Algo.Algorithm, oidSM9) {
return nil, errors.New("x509: not sm2 elliptic curve")
}
params := pubkey.Algo.Parameters.FullBytes
pubOID := new(asn1.ObjectIdentifier)
_, err = asn1.Unmarshal(params, pubOID)
if err != nil {
return
}
var bytes []byte
switch {
case oidSM9Sign.Equal(*pubOID):
input := cryptobyte.String(pubkey.BitString.Bytes)
if !input.ReadASN1BitStringAsBytes(&bytes) || !input.Empty() {
return nil, errors.New("sm9: invalid sign user public key asn1 data")
}
key, err = NewSignMasterPublicKey(bytes)
return
case oidSM9Enc.Equal(*pubOID):
input := cryptobyte.String(pubkey.BitString.Bytes)
if !input.ReadASN1BitStringAsBytes(&bytes) || !input.Empty() {
return nil, errors.New("sm9: invalid encrypt user public key asn1 data")
}
key, err = NewEncryptMasterPublicKey(bytes)
return
}
return nil, errors.New("not support yet")
}
func MarshalPublicKey(key any) ([]byte, error) {
var r pkixPublicKey
var algo pkix.AlgorithmIdentifier
var pubBytes []byte
var oidBytes []byte
var err error
switch k := key.(type) {
case *SignMasterPublicKey:
pubBytes = k.Mpk.MarshalUncompressed()
oidBytes, err = asn1.Marshal(oidSM9Sign)
case *EncryptMasterPublicKey:
pubBytes = k.Mpk.MarshalUncompressed()
oidBytes, err = asn1.Marshal(oidSM9Enc)
default:
return nil, errors.New("sm9: no support key algo")
}
if err != nil {
return nil, errors.New("sm9: failed to marshal algo param: " + err.Error())
}
algo.Algorithm = oidSM9
algo.Parameters.Class = 0
algo.Parameters.Tag = 6
algo.Parameters.IsCompound = false
algo.Parameters.FullBytes = oidBytes
var b cryptobyte.Builder
b.AddASN1BitString(pubBytes)
pub, err := b.Bytes()
if err != nil {
return nil, err
}
r.Algo = algo
r.BitString = asn1.BitString{
Bytes: pub,
}
return asn1.Marshal(r)
}
// =============
func ParsePrivateKey(der []byte) (any, error) {
var privKey pkcs8
if _, err := asn1.Unmarshal(der, &privKey); err != nil {
return nil, err
}
if privKey.Algo.Algorithm.Equal(oidSM9) ||
privKey.Algo.Algorithm.Equal(oidSM9Sign) ||
privKey.Algo.Algorithm.Equal(oidSM9Enc) {
return parsePrivateKey(privKey)
}
return nil, errors.New("sm9: unknown private key algorithm")
}
func MarshalPrivateKey(key any) ([]byte, error) {
switch k := key.(type) {
case *SignPrivateKey:
return marshalSignPrivateKey(k)
case *EncryptPrivateKey:
return marshalEncPrivateKey(k)
case *SignMasterPrivateKey:
return marshalSignMasterPrivateKey(k)
case *EncryptMasterPrivateKey:
return marshalEncMasterPrivateKey(k)
}
return nil, errors.New("key error")
}
// =============
func parsePrivateKey(privKey pkcs8) (key any, err error) {
var bytes []byte
var inner cryptobyte.String
var pubBytes []byte
switch {
case privKey.Algo.Algorithm.Equal(oidSM9Sign):
input := cryptobyte.String(privKey.PrivateKey)
if !input.ReadASN1(&inner, cryptobyte_asn1.SEQUENCE) ||
!input.Empty() ||
!inner.ReadASN1BitStringAsBytes(&bytes) {
return nil, errors.New("sm9: invalid sign user private key asn1 data")
}
if !inner.Empty() && (!inner.ReadASN1BitStringAsBytes(&pubBytes) || !inner.Empty()) {
return nil, errors.New("sm9: invalid sign user private key asn1 data")
}
priBytes := append(bytes, pubBytes...)
key, err = NewSignPrivateKey(priBytes)
return
case privKey.Algo.Algorithm.Equal(oidSM9Enc):
input := cryptobyte.String(privKey.PrivateKey)
if !input.ReadASN1(&inner, cryptobyte_asn1.SEQUENCE) ||
!input.Empty() ||
!inner.ReadASN1BitStringAsBytes(&bytes) {
return nil, errors.New("sm9: invalid encrypt user private key asn1 data")
}
if !inner.Empty() && (!inner.ReadASN1BitStringAsBytes(&pubBytes) || !inner.Empty()) {
return nil, errors.New("sm9: invalid encrypt user private key asn1 data")
}
priBytes := append(bytes, pubBytes...)
key, err = NewEncryptPrivateKey(priBytes)
return
case privKey.Algo.Algorithm.Equal(oidSM9):
bytes := privKey.Algo.Parameters.FullBytes
priOID := new(asn1.ObjectIdentifier)
_, err = asn1.Unmarshal(bytes, priOID)
if err != nil {
return
}
d := &big.Int{}
switch {
case oidSM9Sign.Equal(*priOID):
input := cryptobyte.String(privKey.PrivateKey)
if !input.ReadASN1(&inner, cryptobyte_asn1.SEQUENCE) ||
!input.Empty() ||
!inner.ReadASN1Integer(d) {
return nil, errors.New("sm9: invalid sign master private key asn1 data")
}
if !inner.Empty() && (!inner.ReadASN1BitStringAsBytes(&pubBytes) || !inner.Empty()) {
return nil, errors.New("sm9: invalid sign master private key asn1 data")
}
key, err = NewSignMasterPrivateKey(d.Bytes())
return
case oidSM9Enc.Equal(*priOID):
input := cryptobyte.String(privKey.PrivateKey)
if !input.ReadASN1(&inner, cryptobyte_asn1.SEQUENCE) ||
!input.Empty() ||
!inner.ReadASN1Integer(d) {
return nil, errors.New("sm9: invalid encrypt master private key asn1 data")
}
if !inner.Empty() && (!inner.ReadASN1BitStringAsBytes(&pubBytes) || !inner.Empty()) {
return nil, errors.New("sm9: invalid encrypt master private key asn1 data")
}
key, err = NewEncryptMasterPrivateKey(d.Bytes())
return
}
}
return nil, errors.New("not support yet")
}
// =============
func marshalSignPrivateKey(k *SignPrivateKey) ([]byte, error) {
var privKey pkcs8
privKey.Algo = pkix.AlgorithmIdentifier{
Algorithm: oidSM9Sign,
Parameters: asn1.NullRawValue,
}
var b cryptobyte.Builder
b.AddASN1BitString(k.Sk.MarshalUncompressed())
privans1, err := b.Bytes()
if err != nil {
return nil, err
}
var pub cryptobyte.Builder
pub.AddASN1BitString(k.Mpk.MarshalUncompressed())
pubasn1, err := pub.Bytes()
if err != nil {
return nil, err
}
key := sm9PrivateKey{}
key.PrivateKey.FullBytes = privans1
key.PublicKey.FullBytes = pubasn1
if privKey.PrivateKey, err = asn1.Marshal(key); err != nil {
return nil, errors.New("sm9: failed to marshal sm9 sign private key while building PKCS#8: " + err.Error())
}
return asn1.Marshal(privKey)
}
func marshalEncPrivateKey(k *EncryptPrivateKey) ([]byte, error) {
var privKey pkcs8
privKey.Algo = pkix.AlgorithmIdentifier{
Algorithm: oidSM9Enc,
Parameters: asn1.NullRawValue,
}
var b cryptobyte.Builder
b.AddASN1BitString(k.Sk.MarshalUncompressed())
privans1, err := b.Bytes()
if err != nil {
return nil, err
}
var pub cryptobyte.Builder
pub.AddASN1BitString(k.Mpk.MarshalUncompressed())
pubasn1, err := pub.Bytes()
if err != nil {
return nil, err
}
key := sm9PrivateKey{}
key.PrivateKey.FullBytes = privans1
key.PublicKey.FullBytes = pubasn1
if privKey.PrivateKey, err = asn1.Marshal(key); err != nil {
return nil, errors.New("sm9: failed to marshal sm9 encrypt private key while building PKCS#8: " + err.Error())
}
return asn1.Marshal(privKey)
}
func marshalSignMasterPrivateKey(k *SignMasterPrivateKey) ([]byte, error) {
var privKey pkcs8
oidBytes, err := asn1.Marshal(oidSM9Sign)
if err != nil {
return nil, errors.New("sm9: failed to marshal SM9 OID: " + err.Error())
}
privKey.Algo = pkix.AlgorithmIdentifier{
Algorithm: oidSM9,
Parameters: asn1.RawValue{
FullBytes: oidBytes,
},
}
var pri cryptobyte.Builder
pri.AddASN1BigInt(k.D)
privans1, err := pri.Bytes()
if err != nil {
return nil, err
}
var pub cryptobyte.Builder
pub.AddASN1BitString(k.Mpk.MarshalUncompressed())
pubasn1, err := pub.Bytes()
if err != nil {
return nil, err
}
key := sm9PrivateKey{}
key.PrivateKey.FullBytes = privans1
key.PublicKey.FullBytes = pubasn1
if privKey.PrivateKey, err = asn1.Marshal(key); err != nil {
return nil, errors.New("sm9: failed to marshal sm9 sign master private key while building PKCS#8: " + err.Error())
}
return asn1.Marshal(privKey)
}
func marshalEncMasterPrivateKey(k *EncryptMasterPrivateKey) ([]byte, error) {
var privKey pkcs8
oidBytes, err := asn1.Marshal(oidSM9Enc)
if err != nil {
return nil, errors.New("sm9: failed to marshal SM9 OID: " + err.Error())
}
privKey.Algo = pkix.AlgorithmIdentifier{
Algorithm: oidSM9,
Parameters: asn1.RawValue{
FullBytes: oidBytes,
},
}
var pri cryptobyte.Builder
pri.AddASN1BigInt(k.D)
privans1, err := pri.Bytes()
if err != nil {
return nil, err
}
var pub cryptobyte.Builder
pub.AddASN1BitString(k.Mpk.MarshalUncompressed())
pubasn1, err := pub.Bytes()
if err != nil {
return nil, err
}
key := sm9PrivateKey{}
key.PrivateKey.FullBytes = privans1
key.PublicKey.FullBytes = pubasn1
if privKey.PrivateKey, err = asn1.Marshal(key); err != nil {
return nil, errors.New("sm9: failed to marshal sm9 encrypt master private key while building PKCS#8: " + err.Error())
}
return asn1.Marshal(privKey)
}