golang 生成RSA公鑰和私鑰文件

package main
import (
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"encoding/pem"
"os"

)

func main() {
//rsa 密鑰文件產生
GenRsaKey(1024)
}
//RSA公鑰私鑰產生
func GenRsaKey(bits int) error {
// 生成私鑰文件
privateKey, err := rsa.GenerateKey(rand.Reader, bits)
if err != nil {
return err
}
derStream := x509.MarshalPKCS1PrivateKey(privateKey)
block := &pem.Block{
Type:  "RSA PRIVATE KEY",
Bytes: derStream,
}
file, err := os.Create("private.pem")
if err != nil {
return err
}
err = pem.Encode(file, block)
if err != nil {
return err
}
// 生成公鑰文件
publicKey := &privateKey.PublicKey
derPkix, err := x509.MarshalPKIXPublicKey(publicKey)
if err != nil {
return err
}
block = &pem.Block{
Type:  "PUBLIC KEY",
Bytes: derPkix,
}
file, err = os.Create("public.pem")
if err != nil {
return err
}
err = pem.Encode(file, block)
if err != nil {
return err
}
return nil
}