CBS_ASN1_SEQUENCE
(tag & 0x1f) != (CBS_ASN1_SEQUENCE & 0x1f) &&
(tag & 0x1f) != (CBS_ASN1_SEQUENCE & 0x1f) &&
if (!CBS_get_asn1(&cbs, &session, CBS_ASN1_SEQUENCE))
if (!CBB_add_asn1(&cbb, &session, CBS_ASN1_SEQUENCE))