/
utils.go
295 lines (264 loc) · 7.45 KB
/
utils.go
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package x509
import (
"bytes"
"crypto"
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"encoding/asn1"
"encoding/hex"
"encoding/pem"
"errors"
"math/big"
"github.com/pedroalbanese/gmsm/sm2"
)
func ReadPrivateKeyFromPem(privateKeyPem []byte, pwd []byte) (*sm2.PrivateKey, error) {
var block *pem.Block
block, _ = pem.Decode(privateKeyPem)
if block == nil {
return nil, errors.New("failed to decode private key")
}
priv, err := ParsePKCS8PrivateKey(block.Bytes, pwd)
return priv, err
}
func WritePrivateKeyToPem(key *sm2.PrivateKey, pwd []byte) ([]byte, error) {
var block *pem.Block
der, err := MarshalSm2PrivateKey(key, pwd) //Convert private key to DER format
if err != nil {
return nil, err
}
if pwd != nil {
block = &pem.Block{
Type: "ENCRYPTED PRIVATE KEY",
Bytes: der,
}
} else {
block = &pem.Block{
Type: "PRIVATE KEY",
Bytes: der,
}
}
certPem := pem.EncodeToMemory(block)
return certPem, nil
}
func ReadPublicKeyFromPem(publicKeyPem []byte) (*sm2.PublicKey, error) {
block, _ := pem.Decode(publicKeyPem)
if block == nil || block.Type != "PUBLIC KEY" {
return nil, errors.New("failed to decode public key")
}
return ParseSm2PublicKey(block.Bytes)
}
func WritePublicKeyToPem(key *sm2.PublicKey) ([]byte, error) {
der, err := MarshalSm2PublicKey(key) //Convert publick key to DER format
if err != nil {
return nil, err
}
block := &pem.Block{
Type: "PUBLIC KEY",
Bytes: der,
}
certPem := pem.EncodeToMemory(block)
return certPem, nil
}
//DHex是sm2私钥的真正关键数值
func ReadPrivateKeyFromHex(Dhex string) (*sm2.PrivateKey,error) {
c := sm2.P256Sm2()
d,err:=hex.DecodeString(Dhex)
if err!=nil{
return nil,err
}
k:= new(big.Int).SetBytes(d)
params := c.Params()
one := new(big.Int).SetInt64(1)
n := new(big.Int).Sub(params.N, one)
if k.Cmp(n)>=0{
return nil,errors.New("privateKey's D is overflow.")
}
priv := new(sm2.PrivateKey)
priv.PublicKey.Curve = c
priv.D = k
priv.PublicKey.X, priv.PublicKey.Y = c.ScalarBaseMult(k.Bytes())
return priv,nil
}
func WritePrivateKeyToHex(key *sm2.PrivateKey) string {
return key.D.Text(16)
}
func ReadPublicKeyFromHex(Qhex string) (*sm2.PublicKey, error) {
q,err:=hex.DecodeString(Qhex)
if err!=nil{
return nil,err
}
if len(q)==65&&q[0]==byte(0x04){
q=q[1:]
}
if len(q)!=64{
return nil,errors.New("publicKey is not uncompressed.")
}
pub := new(sm2.PublicKey)
pub.Curve = sm2.P256Sm2()
pub.X = new(big.Int).SetBytes(q[:32])
pub.Y = new(big.Int).SetBytes(q[32:])
return pub, nil
}
func WritePublicKeyToHex(key *sm2.PublicKey) string {
x := key.X.Bytes()
y := key.Y.Bytes()
if n := len(x); n < 32 {
x = append(zeroByteSlice()[:32-n], x...)
}
if n := len(y); n < 32 {
y = append(zeroByteSlice()[:32-n], y...)
}
c := []byte{}
c = append(c, x...)
c = append(c, y...)
c = append([]byte{0x04}, c...)
return hex.EncodeToString(c)
}
func ReadCertificateRequestFromPem(certPem []byte) (*CertificateRequest, error) {
block, _ := pem.Decode(certPem)
if block == nil {
return nil, errors.New("failed to decode certificate request")
}
return ParseCertificateRequest(block.Bytes)
}
func CreateCertificateRequestToPem(template *CertificateRequest, signer crypto.Signer) ([]byte, error) {
der, err := CreateCertificateRequest(rand.Reader, template, signer)
if err != nil {
return nil, err
}
block := &pem.Block{
Type: "CERTIFICATE REQUEST",
Bytes: der,
}
certPem := pem.EncodeToMemory(block)
return certPem, nil
}
func ReadCertificateFromPem(certPem []byte) (*Certificate, error) {
block, _ := pem.Decode(certPem)
if block == nil {
return nil, errors.New("failed to decode certificate request")
}
return ParseCertificate(block.Bytes)
}
// CreateCertificate creates a new certificate based on a template. The
// following members of template are used: SerialNumber, Subject, NotBefore,
// NotAfter, KeyUsage, ExtKeyUsage, UnknownExtKeyUsage, BasicConstraintsValid,
// IsCA, MaxPathLen, SubjectKeyId, DNSNames, PermittedDNSDomainsCritical,
// PermittedDNSDomains, SignatureAlgorithm.
//
// The certificate is signed by parent. If parent is equal to template then the
// certificate is self-signed. The parameter pub is the public key of the
// signee and priv is the private key of the signer.
//
// The returned slice is the certificate in DER encoding.
//
// All keys types that are implemented via crypto.Signer are supported (This
// includes *rsa.PublicKey and *ecdsa.PublicKey.)
func CreateCertificate(template, parent *Certificate, publicKey *sm2.PublicKey, signer crypto.Signer) ([]byte, error) {
if template.SerialNumber == nil {
return nil, errors.New("x509: no SerialNumber given")
}
hashFunc, signatureAlgorithm, err := signingParamsForPublicKey(signer.Public(), template.SignatureAlgorithm)
if err != nil {
return nil, err
}
publicKeyBytes, publicKeyAlgorithm, err := marshalPublicKey(publicKey)
if err != nil {
return nil, err
}
asn1Issuer, err := subjectBytes(parent)
if err != nil {
return nil, err
}
asn1Subject, err := subjectBytes(template)
if err != nil {
return nil, err
}
if !bytes.Equal(asn1Issuer, asn1Subject) && len(parent.SubjectKeyId) > 0 {
template.AuthorityKeyId = parent.SubjectKeyId
}
extensions, err := buildExtensions(template)
if err != nil {
return nil, err
}
encodedPublicKey := asn1.BitString{BitLength: len(publicKeyBytes) * 8, Bytes: publicKeyBytes}
c := tbsCertificate{
Version: 2,
SerialNumber: template.SerialNumber,
SignatureAlgorithm: signatureAlgorithm,
Issuer: asn1.RawValue{FullBytes: asn1Issuer},
Validity: validity{template.NotBefore.UTC(), template.NotAfter.UTC()},
Subject: asn1.RawValue{FullBytes: asn1Subject},
PublicKey: publicKeyInfo{nil, publicKeyAlgorithm, encodedPublicKey},
Extensions: extensions,
}
tbsCertContents, err := asn1.Marshal(c)
if err != nil {
return nil, err
}
c.Raw = tbsCertContents
digest := tbsCertContents
switch template.SignatureAlgorithm {
case SM2WithSM3, SM2WithSHA1, SM2WithSHA256:
break
default:
h := hashFunc.New()
h.Write(tbsCertContents)
digest = h.Sum(nil)
}
var signerOpts crypto.SignerOpts
signerOpts = hashFunc
if template.SignatureAlgorithm != 0 && template.SignatureAlgorithm.isRSAPSS() {
signerOpts = &rsa.PSSOptions{
SaltLength: rsa.PSSSaltLengthEqualsHash,
Hash: crypto.Hash(hashFunc),
}
}
var signature []byte
signature, err = signer.Sign(rand.Reader, digest, signerOpts)
if err != nil {
return nil, err
}
return asn1.Marshal(certificate{
nil,
c,
signatureAlgorithm,
asn1.BitString{Bytes: signature, BitLength: len(signature) * 8},
})
}
// CreateCertificateToPem creates a new certificate based on a template and
// encodes it to PEM format. It uses CreateCertificate to create certificate
// and returns its PEM format.
func CreateCertificateToPem(template, parent *Certificate, pubKey *sm2.PublicKey, signer crypto.Signer) ([]byte, error) {
der, err := CreateCertificate(template, parent, pubKey, signer)
if err != nil {
return nil, err
}
block := &pem.Block{
Type: "CERTIFICATE",
Bytes: der,
}
certPem := pem.EncodeToMemory(block)
return certPem, nil
}
func ParseSm2CertifateToX509(asn1data []byte) (*x509.Certificate, error) {
sm2Cert, err := ParseCertificate(asn1data)
if err != nil {
return nil, err
}
return sm2Cert.ToX509Certificate(), nil
}
// 32byte
func zeroByteSlice() []byte {
return []byte{
0, 0, 0, 0,
0, 0, 0, 0,
0, 0, 0, 0,
0, 0, 0, 0,
0, 0, 0, 0,
0, 0, 0, 0,
0, 0, 0, 0,
0, 0, 0, 0,
}
}