github.com/d4l3k/go@v0.0.0-20151015000803-65fc379daeda/src/crypto/x509/pkcs8.go (about)

     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("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("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("x509: PKCS#8 wrapping contained private key with unknown algorithm: %v", privKey.Algo.Algorithm)
    53  	}
    54  }