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package main
import (
"crypto/rand"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"fmt"
"flag"
"io"
"os"
)
type (
SignFlags struct {
PrivateKeyPath string // path to the private key
Output string // path where to store the CSR
BaseAttributes pkix.Name
private_key PrivateKey
output_stream io.WriteCloser // the output stream for the CSR
}
)
// create a sign request with a private key
func create_sign_request() {
flags := parse_sign_flags()
flags.private_key = load_private_key(flags.PrivateKeyPath)
var err error
flags.output_stream, err = open_output_stream(flags.Output)
if err != nil {
crash_with_help(2, fmt.Sprintf("Error when creating file %s: %s", flags.Output, err))
}
defer flags.output_stream.Close()
csr_template := &x509.CertificateRequest{
Subject: flags.BaseAttributes,
}
csr_raw, err := x509.CreateCertificateRequest(rand.Reader, csr_template, flags.private_key)
if err != nil {
fmt.Fprintln(os.Stderr, "Error when generating CSR: ", err)
os.Exit(3)
}
block := &pem.Block{Type: TypeLabelCSR, Bytes: csr_raw}
pem.Encode(flags.output_stream, block)
}
// parse the flags to create a certificate sign request
func parse_sign_flags() SignFlags {
flags := SignFlags{}
fs := flag.NewFlagSet("create-cert-sign", flag.ExitOnError)
fs.StringVar(&flags.PrivateKeyPath, "private-key", "", "path to the private key file")
fs.StringVar(&flags.Output, "output", "STDOUT", "path where the generated csr should be stored")
flags.BaseAttributes = pkix.Name{}
fs.StringVar(&flags.BaseAttributes.CommonName, "common-name", "", "the name of the resource")
fs.StringVar(&flags.BaseAttributes.SerialNumber, "serial", "1", "serial number for the request")
fs.Parse(os.Args[2:])
return flags
}
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