主代码:
package rsa
import (
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"io/ioutil"
"math/big"
rd "math/rand"
"os"
"time"
)
func init() {
rd.Seed(time.Now().UnixNano())
}
type CertInformation struct {
Country []string
Organization []string
OrganizationalUnit []string
EmailAddress []string
Province []string
Locality []string
CommonName string
CrtName,KeyName string
IsCA bool
Names []pkix.AttributeTypeAndValue
}
func CreateCRT(RootCa *x509.Certificate,RootKey *rsa.PrivateKey,info CertInformation) error {
Crt := newCertificate(info)
Key,err := rsa.GenerateKey(rand.Reader, 2048)
if err != nil {
return err
}
var buf []byte
if RootCa == nil || RootKey == nil {
//创建自签名证书
buf,err = x509.CreateCertificate(rand.Reader,Crt,&Key.PublicKey,Key)
} else {
//使用根证书签名
buf,RootCa,RootKey)
}
if err != nil {
return err
}
err = write(info.CrtName,"CERTIFICATE",buf)
if err != nil {
return err
}
buf = x509.MarshalPKCS1PrivateKey(Key)
return write(info.KeyName,"PRIVATE KEY",buf)
}
//编码写入文件
func write(filename,Type string,p []byte) error {
File,err := os.Create(filename)
defer File.Close()
if err != nil {
return err
}
var b *pem.Block = &pem.Block{Bytes: p,Type: Type}
return pem.Encode(File,b)
}
func Parse(crtPath,keyPath string) (rootcertificate *x509.Certificate,rootPrivateKey *rsa.PrivateKey,err error) {
rootcertificate,err = ParseCrt(crtPath)
if err != nil {
return
}
rootPrivateKey,err = ParseKey(keyPath)
return
}
func ParseCrt(path string) (*x509.Certificate,error) {
buf,err := ioutil.ReadFile(path)
if err != nil {
return nil,err
}
p := &pem.Block{}
p,buf = pem.Decode(buf)
return x509.ParseCertificate(p.Bytes)
}
func ParseKey(path string) (*rsa.PrivateKey,err
}
p,buf := pem.Decode(buf)
return x509.ParsePKCS1PrivateKey(p.Bytes)
}
func newCertificate(info CertInformation) *x509.Certificate {
return &x509.Certificate{
SerialNumber: big.NewInt(rd.Int63()),Subject: pkix.Name{
Country: info.Country,Organization: info.Organization,OrganizationalUnit: info.OrganizationalUnit,Province: info.Province,CommonName: info.CommonName,Locality: info.Locality,ExtraNames: info.Names,},NotBefore: time.Now(),//证书的开始时间
NotAfter: time.Now().AddDate(20, 0, 0),//证书的结束时间
BasicConstraintsValid: true,//基本的有效性约束
IsCA: info.IsCA,//是否是根证书
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth,x509.ExtKeyUsageServerAuth},//证书用途
KeyUsage: x509.KeyUsageDigitalSignature | x509.KeyUsageCertSign,EmailAddresses: info.EmailAddress,}
}
测试代码:
package rsa
import (
"crypto/x509/pkix"
"encoding/asn1"
"os"
"testing"
)
func Test_crt(t *testing.T) {
baseinfo := CertInformation{Country: []string{"CN"},Organization: []string{"WS"},IsCA: true,OrganizationalUnit: []string{"work-stacks"},EmailAddress: []string{"czxichen@163.com"},Locality: []string{"SuZhou"},Province: []string{"JiangSu"},CommonName: "Work-Stacks",CrtName: "test_root.crt",KeyName: "test_root.key"}
err := CreateCRT(nil,nil,baseinfo)
if err != nil {
t.Log("Create crt error,Error info:",err)
return
}
crtinfo := baseinfo
crtinfo.IsCA = false
crtinfo.CrtName = "test_server.crt"
crtinfo.KeyName = "test_server.key"
crtinfo.Names = []pkix.AttributeTypeAndValue{{asn1.ObjectIdentifier{2,1,3},"MAC_ADDR"}} //添加扩展字段用来做自定义使用
crt,pri,err := Parse(baseinfo.CrtName,baseinfo.KeyName)
if err != nil {
t.Log("Parse crt error,err)
return
}
err = CreateCRT(crt,crtinfo)
if err != nil {
t.Log("Create crt error,err)
}
os.Remove(baseinfo.CrtName)
os.Remove(baseinfo.KeyName)
os.Remove(crtinfo.CrtName)
os.Remove(crtinfo.KeyName)
}
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