func OidFromExtKeyUsage(eku x509.ExtKeyUsage) (oid asn1.ObjectIdentifier, ok bool)
func Resolve(chainPem string, did string, ignoreTime bool) (string, error)
func VerifyCertificateChain(chain []*x509.Certificate, trustedRoots []*x509.Certificate, ignoreTime bool) ([][]*x509.Certificate, error)