A quick script to generate CSRs

gencsr.go

// This is a simple script to generate test CSRs.
package main

import (
	"crypto/rand"
	"crypto/rsa"
	"crypto/x509"
	"crypto/x509/pkix"
	"encoding/asn1"
	"encoding/pem"
	"fmt"
	"io/ioutil"
)

func main() {
	priv, err := rsa.GenerateKey(rand.Reader, 2048)
	if err != nil {
		fmt.Println("could not generate key")
		return
	}

	template := &x509.CertificateRequest{
		SignatureAlgorithm: x509.SHA1WithRSA,
		Subject: pkix.Name{
			CommonName: "not-example.com",
		},
		DNSNames: []string{
			"not-example.com",
			"www.not-example.com",
		},
	}

	csrDER, err := x509.CreateCertificateRequest(rand.Reader, template, priv)
	if err != nil {
		fmt.Println("could not generate CSR")
		return
	}

	csrPEM := pem.EncodeToMemory(&pem.Block{
		Type:  "CERTIFICATE REQUEST",
		Bytes: csrDER,
	})

	ioutil.WriteFile("test.pem", csrPEM, 0666)
}