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package main
import (
"crypto/ecdsa"
"crypto/rsa"
"crypto/x509"
"encoding/pem"
"flag"
"fmt"
"io/ioutil"
"log"
"github.com/kisom/goutils/die"
)
func main() {
flag.Parse()
for _, fileName := range flag.Args() {
in, err := ioutil.ReadFile(fileName)
die.If(err)
if p, _ := pem.Decode(in); p != nil {
if p.Type != "CERTIFICATE REQUEST" {
log.Fatal("INVALID FILE TYPE")
}
in = p.Bytes
}
csr, err := x509.ParseCertificateRequest(in)
die.If(err)
out, err := x509.MarshalPKIXPublicKey(csr.PublicKey)
die.If(err)
var t string
switch pub := csr.PublicKey.(type) {
case *rsa.PublicKey:
t = "RSA PUBLIC KEY"
case *ecdsa.PublicKey:
t = "EC PUBLIC KEY"
default:
die.With("unrecognised public key type %T", pub)
}
p := &pem.Block{
Type: t,
Bytes: out,
}
err = ioutil.WriteFile(fileName+".pub", pem.EncodeToMemory(p), 0644)
die.If(err)
fmt.Printf("[+] wrote %s.\n", fileName+".pub")
}
}
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