structs for parsing the result from a keygen tag

type SubjectPublicKeyInfo struct {
    Algorithm pkix.AlgorithmIdentifier
    SubjectPublicKey asn1.BitString
}

type PublicKeyAndChallenge struct {
    Spki SubjectPublicKeyInfo
    Challenge string
}

type SignedPublicKeyAndChallenge struct{
    PublicKeyAndChallenge PublicKeyAndChallenge
    SignitureAlgorithm pkix.AlgorithmIdentifier
    Signiture asn1.BitString
}