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