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//go:build !go1.13
package webauthncose
import (
"crypto/x509/pkix"
"encoding/asn1"
"golang.org/x/crypto/ed25519"
)
var oidSignatureEd25519 = asn1.ObjectIdentifier{1, 3, 101, 112}
type pkixPublicKey struct {
Algo pkix.AlgorithmIdentifier
BitString asn1.BitString
}
// marshalEd25519PublicKey is a backport of the functionality introduced in
// Go v1.13.
// Ref: https://golang.org/doc/go1.13#crypto/ed25519
// Ref: https://golang.org/doc/go1.13#crypto/x509
func marshalEd25519PublicKey(pub ed25519.PublicKey) ([]byte, error) {
publicKeyBytes := pub
var publicKeyAlgorithm pkix.AlgorithmIdentifier
publicKeyAlgorithm.Algorithm = oidSignatureEd25519
pkix := pkixPublicKey{
Algo: publicKeyAlgorithm,
BitString: asn1.BitString{
Bytes: publicKeyBytes,
BitLength: 8 * len(publicKeyBytes),
},
}
ret, _ := asn1.Marshal(pkix)
return ret, nil
}
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