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package https
import (
"crypto"
"crypto/ecdsa"
"crypto/rsa"
"crypto/x509"
"encoding/pem"
"errors"
"io/ioutil"
"os"
)
// loadPrivateKey loads a PEM-encoded ECC/RSA private key from file.
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")
}
// savePrivateKey saves a PEM-encoded ECC/RSA private key to file.
func savePrivateKey(key crypto.PrivateKey, file string) error {
var pemType string
var keyBytes []byte
switch key := key.(type) {
case *ecdsa.PrivateKey:
var err error
pemType = "EC"
keyBytes, err = x509.MarshalECPrivateKey(key)
if err != nil {
return err
}
case *rsa.PrivateKey:
pemType = "RSA"
keyBytes = x509.MarshalPKCS1PrivateKey(key)
}
pemKey := pem.Block{Type: pemType + " PRIVATE KEY", Bytes: keyBytes}
keyOut, err := os.Create(file)
if err != nil {
return err
}
keyOut.Chmod(0600)
defer keyOut.Close()
return pem.Encode(keyOut, &pemKey)
}
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