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package main
import (
"bytes"
"crypto"
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rsa"
"crypto/x509"
"encoding/pem"
"errors"
"flag"
"fmt"
"io/ioutil"
"log"
"os"
"github.com/kisom/goutils/die"
)
var validPEMs = map[string]bool{
"PRIVATE KEY": true,
"RSA PRIVATE KEY": true,
"EC PRIVATE KEY": true,
}
const (
curveInvalid = iota // any invalid curve
curveRSA // indicates key is an RSA key, not an EC key
curveP256
curveP384
curveP521
)
func getECCurve(pub interface{}) int {
switch pub := pub.(type) {
case *ecdsa.PublicKey:
switch pub.Curve {
case elliptic.P256():
return curveP256
case elliptic.P384():
return curveP384
case elliptic.P521():
return curveP521
default:
return curveInvalid
}
case *rsa.PublicKey:
return curveRSA
default:
return curveInvalid
}
}
func loadKey(path string) (crypto.Signer, error) {
in, err := ioutil.ReadFile(path)
if err != nil {
return nil, err
}
in = bytes.TrimSpace(in)
p, _ := pem.Decode(in)
if p != nil {
if !validPEMs[p.Type] {
return nil, errors.New("invalid private key file type " + p.Type)
}
in = p.Bytes
}
priv, err := x509.ParsePKCS8PrivateKey(in)
if err != nil {
priv, err = x509.ParsePKCS1PrivateKey(in)
if err != nil {
priv, err = x509.ParseECPrivateKey(in)
if err != nil {
return nil, err
}
}
}
switch priv.(type) {
case *rsa.PrivateKey:
return priv.(*rsa.PrivateKey), nil
case *ecdsa.PrivateKey:
return priv.(*ecdsa.PrivateKey), nil
}
// should never reach here
return nil, errors.New("invalid private key")
}
func main() {
var keyFile, certFile string
flag.StringVar(&keyFile, "k", "", "TLS private `key` file")
flag.StringVar(&certFile, "c", "", "TLS `certificate` file")
flag.Parse()
in, err := ioutil.ReadFile(certFile)
die.If(err)
p, _ := pem.Decode(in)
if p != nil {
if p.Type != "CERTIFICATE" {
die.With("invalid certificate (type is %s)", p.Type)
}
in = p.Bytes
}
cert, err := x509.ParseCertificate(in)
die.If(err)
priv, err := loadKey(keyFile)
die.If(err)
switch pub := priv.Public().(type) {
case *rsa.PublicKey:
switch certPub := cert.PublicKey.(type) {
case *rsa.PublicKey:
if pub.N.Cmp(certPub.N) != 0 || pub.E != certPub.E {
fmt.Println("No match (public keys don't match).")
os.Exit(1)
}
fmt.Println("Match.")
return
case *ecdsa.PublicKey:
fmt.Println("No match (RSA private key, EC public key).")
os.Exit(1)
}
case *ecdsa.PublicKey:
privCurve := getECCurve(pub)
certCurve := getECCurve(cert.PublicKey)
log.Printf("priv: %d\tcert: %d\n", privCurve, certCurve)
if certCurve == curveRSA {
fmt.Println("No match (private key is EC, certificate is RSA).")
os.Exit(1)
} else if privCurve == curveInvalid {
fmt.Println("No match (invalid private key curve).")
os.Exit(1)
} else if privCurve != certCurve {
fmt.Println("No match (EC curves don't match).")
os.Exit(1)
}
certPub := cert.PublicKey.(*ecdsa.PublicKey)
if pub.X.Cmp(certPub.X) != 0 {
fmt.Println("No match (public keys don't match).")
os.Exit(1)
}
if pub.Y.Cmp(certPub.Y) != 0 {
fmt.Println("No match (public keys don't match).")
os.Exit(1)
}
fmt.Println("Match.")
default:
fmt.Printf("Unrecognised private key type: %T\n", priv.Public())
os.Exit(1)
}
}
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