public void generateSign(MultipartFile file) {
        JCPInit.initProviders(false);

        KeyStore keyStore = KeyStore.getInstance(JCP.HD_STORE_NAME, JCP.PROVIDER_NAME);
        keyStore.load(null, null);

        PrivateKey privateKey = (PrivateKey) keyStore.getKey("alias", "password".toCharArray());

        Certificate[] certificateChain = keyStore.getCertificateChain("alias");
        List<X509Certificate> certList = Arrays.stream(certificateChain)
            .map(c -> (X509Certificate) c)
            .toList();

        CAdESSignature cadesSignature = new CAdESSignature(true);
        cadesSignature.addSigner(
            JCP.PROVIDER_NAME,
            privateKey,
            certList,
            CAdES_BES,
            null,
            false
        );

        ByteArrayOutputStream signatureStream = new ByteArrayOutputStream();

        cadesSignature.open(signatureStream); 
        cadesSignature.update(file.getBytes()); 

        cadesSignature.close(); 
        signatureStream.close();

        byte[] cadesCms = signatureStream.toByteArray();

        // Проверка
        CAdESSignature checkedSignature = new CAdESSignature(cadesCms, file.getBytes(), CAdES_BES);
        checkedSignature.verify(new HashSet<>(certList), null);
    }