case EXPORTABLE:
return new Exportable(isCritical, data);
case ISSUER_KEY_ID:
return new IssuerKeyID(isCritical, data);
case TRUST_SIG:
return new TrustSignature(isCritical, data);
case PREFERRED_COMP_ALGS:
case PREFERRED_HASH_ALGS:
case PREFERRED_SYM_ALGS:
return new PreferredAlgorithms(type, isCritical, data);
case KEY_FLAGS: