int CMS_RecipientInfo_set0_key(CMS_RecipientInfo *ri,
                               unsigned char *key, size_t keylen)
{
    CMS_KEKRecipientInfo *kekri;
    if (ri->type != CMS_RECIPINFO_KEK) {
        CMSerr(CMS_F_CMS_RECIPIENTINFO_SET0_KEY, CMS_R_NOT_KEK);
        return 0;
    }

    kekri = ri->d.kekri;
    kekri->key = key;
    kekri->keylen = keylen;
    return 1;
}

The product does not encrypt sensitive or critical information before storage or transmission.