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cert.go
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cert.go
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package cert
import (
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"fmt"
"github.com/pkg/errors"
"math/big"
"os"
"strings"
"time"
)
const (
// ServerName cert comman name
ServerName = "crocodile"
)
// GenerateCert generate cert cert key file
func GenerateCert(pemkeydir string) error {
pemkeydir = strings.TrimRight(pemkeydir, "/")
_, err := os.Stat(pemkeydir)
if os.IsNotExist(err) {
err = os.MkdirAll(pemkeydir, 0755)
if err != nil {
return err
}
}
max := new(big.Int).Lsh(big.NewInt(1), 128)
serialNumber, _ := rand.Int(rand.Reader, max)
subject := pkix.Name{
CommonName: ServerName,
}
template := x509.Certificate{
SerialNumber: serialNumber,
Subject: subject,
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature, //KeyUsage 与 ExtKeyUsage 用来表明该证书是用来做服务器认证的
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth, x509.ExtKeyUsageServerAuth}, // 密钥扩展用途的序列
NotBefore: time.Now(),
NotAfter: time.Now().Add(time.Hour * 24 * 3650),
}
pk, _ := rsa.GenerateKey(rand.Reader, 1024)
derBytes, _ := x509.CreateCertificate(rand.Reader, &template, &template, &pk.PublicKey, pk) //DER 格式
certOut, err := os.Create(fmt.Sprintf("%s/cert.pem", pemkeydir))
if err != nil {
return errors.Wrap(err, "os.Create ")
}
err = pem.Encode(certOut, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes})
if err != nil {
return errors.Wrap(err, "pem.Encode")
}
err = certOut.Close()
if err != nil {
return errors.Wrap(err, "certOut.Close")
}
keyOut, err := os.Create(fmt.Sprintf("%s/key.pem", pemkeydir))
if err != nil {
return errors.Wrap(err, "os.Create ")
}
err = pem.Encode(keyOut, &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(pk)})
if err != nil {
return errors.Wrap(err, "pem.Encode")
}
err = keyOut.Close()
if err != nil {
return errors.Wrap(err, "certOut.Close")
}
return nil
}