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package pkcs12
import (
"crypto/ecdsa"
"crypto/rsa"
"crypto/x509"
"crypto/x509/pkix"
"encoding/asn1"
"errors"
)
// pkcs8 reflects an ASN.1, PKCS#8 PrivateKey. See
// ftp://ftp.rsasecurity.com/pub/pkcs/pkcs-8/pkcs-8v1_2.asn
// and RFC5208.
type pkcs8 struct {
Version int
Algo pkix.AlgorithmIdentifier
PrivateKey []byte
// optional attributes omitted.
}
var (
oidPublicKeyRSA = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 1}
oidPublicKeyECDSA = asn1.ObjectIdentifier{1, 2, 840, 10045, 2, 1}
nullAsn = asn1.RawValue{Tag: 5}
)
// marshalPKCS8PrivateKey converts a private key to PKCS#8 encoded form.
// See http://www.rsa.com/rsalabs/node.asp?id=2130 and RFC5208.
func marshalPKCS8PrivateKey(key interface{}) ([]byte, error) {
pkcs := pkcs8{
Version: 0,
}
switch key := key.(type) {
case *rsa.PrivateKey:
pkcs.Algo = pkix.AlgorithmIdentifier{
Algorithm: oidPublicKeyRSA,
Parameters: nullAsn,
}
pkcs.PrivateKey = x509.MarshalPKCS1PrivateKey(key)
case *ecdsa.PrivateKey:
bytes, err := x509.MarshalECPrivateKey(key)
if err != nil {
return nil, errors.New("x509: failed to marshal to PKCS#8: " + err.Error())
}
pkcs.Algo = pkix.AlgorithmIdentifier{
Algorithm: oidPublicKeyECDSA,
Parameters: nullAsn,
}
pkcs.PrivateKey = bytes
default:
return nil, errors.New("x509: PKCS#8 only RSA and ECDSA private keys supported")
}
bytes, err := asn1.Marshal(pkcs)
if err != nil {
return nil, errors.New("x509: failed to marshal to PKCS#8: " + err.Error())
}
return bytes, nil
}
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