AFF_PT_MONTGOMERY_MAGIC
MUST_HAVE(((in != NULL) && (in->magic == AFF_PT_MONTGOMERY_MAGIC)), ret, err);
pt->magic = AFF_PT_MONTGOMERY_MAGIC;
in->magic = AFF_PT_MONTGOMERY_MAGIC;
if ((in != NULL) && (in->magic == AFF_PT_MONTGOMERY_MAGIC) && (in->crv != NULL)) {