103 lines
2.9 KiB
Go
103 lines
2.9 KiB
Go
// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package x509
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import (
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"crypto/ecdsa"
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"crypto/rsa"
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"errors"
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"fmt"
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"github.com/google/certificate-transparency-go/asn1"
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"github.com/google/certificate-transparency-go/x509/pkix"
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)
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// pkcs8 reflects an ASN.1, PKCS#8 PrivateKey. See
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// ftp://ftp.rsasecurity.com/pub/pkcs/pkcs-8/pkcs-8v1_2.asn
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// and RFC 5208.
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type pkcs8 struct {
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Version int
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Algo pkix.AlgorithmIdentifier
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PrivateKey []byte
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// optional attributes omitted.
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}
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// ParsePKCS8PrivateKey parses an unencrypted, PKCS#8 private key.
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// See RFC 5208.
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func ParsePKCS8PrivateKey(der []byte) (key interface{}, err error) {
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var privKey pkcs8
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if _, err := asn1.Unmarshal(der, &privKey); err != nil {
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return nil, err
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}
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switch {
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case privKey.Algo.Algorithm.Equal(OIDPublicKeyRSA):
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key, err = ParsePKCS1PrivateKey(privKey.PrivateKey)
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if err != nil {
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return nil, errors.New("x509: failed to parse RSA private key embedded in PKCS#8: " + err.Error())
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}
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return key, nil
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case privKey.Algo.Algorithm.Equal(OIDPublicKeyECDSA):
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bytes := privKey.Algo.Parameters.FullBytes
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namedCurveOID := new(asn1.ObjectIdentifier)
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if _, err := asn1.Unmarshal(bytes, namedCurveOID); err != nil {
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namedCurveOID = nil
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}
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key, err = parseECPrivateKey(namedCurveOID, privKey.PrivateKey)
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if err != nil {
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return nil, errors.New("x509: failed to parse EC private key embedded in PKCS#8: " + err.Error())
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}
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return key, nil
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default:
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return nil, fmt.Errorf("x509: PKCS#8 wrapping contained private key with unknown algorithm: %v", privKey.Algo.Algorithm)
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}
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}
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// MarshalPKCS8PrivateKey converts a private key to PKCS#8 encoded form.
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// The following key types are supported: *rsa.PrivateKey, *ecdsa.PublicKey.
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// Unsupported key types result in an error.
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//
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// See RFC 5208.
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func MarshalPKCS8PrivateKey(key interface{}) ([]byte, error) {
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var privKey pkcs8
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switch k := key.(type) {
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case *rsa.PrivateKey:
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privKey.Algo = pkix.AlgorithmIdentifier{
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Algorithm: OIDPublicKeyRSA,
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Parameters: asn1.NullRawValue,
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}
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privKey.PrivateKey = MarshalPKCS1PrivateKey(k)
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case *ecdsa.PrivateKey:
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oid, ok := OIDFromNamedCurve(k.Curve)
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if !ok {
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return nil, errors.New("x509: unknown curve while marshalling to PKCS#8")
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}
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oidBytes, err := asn1.Marshal(oid)
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if err != nil {
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return nil, errors.New("x509: failed to marshal curve OID: " + err.Error())
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}
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privKey.Algo = pkix.AlgorithmIdentifier{
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Algorithm: OIDPublicKeyECDSA,
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Parameters: asn1.RawValue{
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FullBytes: oidBytes,
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},
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}
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if privKey.PrivateKey, err = marshalECPrivateKeyWithOID(k, nil); err != nil {
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return nil, errors.New("x509: failed to marshal EC private key while building PKCS#8: " + err.Error())
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}
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default:
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return nil, fmt.Errorf("x509: unknown key type while marshalling PKCS#8: %T", key)
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}
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return asn1.Marshal(privKey)
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}
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