libgo/go/crypto/x509/pkcs8.go

   1 // Copyright 2011 The Go Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style
   3 // license that can be found in the LICENSE file.
   4
   5 package x509
   6
   7 import (
   8         "crypto/x509/pkix"
   9         "encoding/asn1"
  10         "errors"
  11         "fmt"
  12 )
  13
  14 // pkcs8 reflects an ASN.1, PKCS#8 PrivateKey. See
  15 // ftp://ftp.rsasecurity.com/pub/pkcs/pkcs-8/pkcs-8v1_2.asn
  16 // and RFC5208.
  17 type pkcs8 struct {
  18         Version    int
  19         Algo       pkix.AlgorithmIdentifier
  20         PrivateKey []byte
  21         // optional attributes omitted.
  22 }
  23
  24 // ParsePKCS8PrivateKey parses an unencrypted, PKCS#8 private key. See
  25 // http://www.rsa.com/rsalabs/node.asp?id=2130 and RFC5208.
  26 func ParsePKCS8PrivateKey(der []byte) (key interface{}, err error) {
  27         var privKey pkcs8
  28         if _, err := asn1.Unmarshal(der, &privKey); err != nil {
  29                 return nil, err
  30         }
  31         switch {
  32         case privKey.Algo.Algorithm.Equal(oidPublicKeyRSA):
  33                 key, err = ParsePKCS1PrivateKey(privKey.PrivateKey)
  34                 if err != nil {
  35                         return nil, errors.New("crypto/x509: failed to parse RSA private key embedded in PKCS#8: " + err.Error())
  36                 }
  37                 return key, nil
  38
  39         case privKey.Algo.Algorithm.Equal(oidPublicKeyECDSA):
  40                 bytes := privKey.Algo.Parameters.FullBytes
  41                 namedCurveOID := new(asn1.ObjectIdentifier)
  42                 if _, err := asn1.Unmarshal(bytes, namedCurveOID); err != nil {
  43                         namedCurveOID = nil
  44                 }
  45                 key, err = parseECPrivateKey(namedCurveOID, privKey.PrivateKey)
  46                 if err != nil {
  47                         return nil, errors.New("crypto/x509: failed to parse EC private key embedded in PKCS#8: " + err.Error())
  48                 }
  49                 return key, nil
  50
  51         default:
  52                 return nil, fmt.Errorf("crypto/x509: PKCS#8 wrapping contained private key with unknown algorithm: %v", privKey.Algo.Algorithm)
  53         }
  54 }