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package main
import (
"crypto"
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"crypto/x509"
"encoding/pem"
"errors"
"io/ioutil"
"os"
)
func generatePrivateKey(file string) (crypto.PrivateKey, error) {
privateKey, err := ecdsa.GenerateKey(elliptic.P384(), rand.Reader)
if err != nil {
return nil, err
}
keyBytes, err := x509.MarshalECPrivateKey(privateKey)
if err != nil {
return nil, err
}
pemKey := pem.Block{Type: "EC PRIVATE KEY", Bytes: keyBytes}
certOut, err := os.Create(file)
if err != nil {
return nil, err
}
pem.Encode(certOut, &pemKey)
certOut.Close()
return privateKey, nil
}
func loadPrivateKey(file string) (crypto.PrivateKey, error) {
keyBytes, err := ioutil.ReadFile(file)
if err != nil {
return nil, err
}
keyBlock, _ := pem.Decode(keyBytes)
switch keyBlock.Type {
case "RSA PRIVATE KEY":
return x509.ParsePKCS1PrivateKey(keyBlock.Bytes)
case "EC PRIVATE KEY":
return x509.ParseECPrivateKey(keyBlock.Bytes)
}
return nil, errors.New("Unknown private key type.")
}
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