"digestSignatures": [
    {
        "base64Encoded": "HlaeIHXXEcGT1bFxo1NlpAzpr+kJ2IQrcxVdvDTep6xjsmD1FDb+6NIyLT+/T24S0mPfVCU75sieOMt71TBS7w==",
        "certificateUuid": "61000366d11e143acbc03a56d70001000366d1"
    }
]

    @Override
    public RsaSignResponse sign(RsaSignRequest request) throws Exception {

        Security.addProvider(new BouncyCastleProvider());
        BouncyCastleProvider provider = (BouncyCastleProvider) Security.getProvider("BC");
        PrivateKey key = (PrivateKey) keyStore.getKey(KEYSTORE_ALIAS, KEYSTORE_PWD.toCharArray());
        X509Certificate cert = (X509Certificate) keyStore
                .getCertificate(KEYSTORE_ALIAS);

        CMSTypedData msg = new CMSProcessableByteArray(request.getDataToSign().getBytes());
        CMSSignedDataGenerator signedDataGen = new CMSSignedDataGenerator();
        X509CertificateHolder signCert = new X509CertificateHolder(
                cert.getEncoded());
        ContentSigner signer = new JcaContentSignerBuilder("sha256WithRSAEncryption").setProvider(provider)
                .build(key);

        signedDataGen.addSignerInfoGenerator(new JcaSignerInfoGeneratorBuilder(
                new JcaDigestCalculatorProviderBuilder().setProvider(provider)
                        .build()
        ).setDirectSignature(true).build(signer, signCert));

        // add the signing cert to the signature
        JcaCertStore certs = new JcaCertStore(Collections.singletonList(cert));
        signedDataGen.addCertificates(certs);
        CMSSignedData signedData = signedDataGen.generate(msg, true);
        byte[] signatureBytes = signedData.getEncoded("DER");

        MessageDigest messageDigest = MessageDigest.getInstance("SHA-512");
        byte[] hashedString = messageDigest.digest(request.getDataToSign().getBytes());

        return new RsaSignResponse()
                .setDataToSignBase64(new String(Base64.getEncoder().encode(request.getDataToSign().getBytes(StandardCharsets.UTF_8))))
                .setAttachedSignature(new String(Base64.getEncoder().encode(signatureBytes)))
                .setPublicCertificate(new String(Base64.getEncoder().encode(cert.getEncoded())))
                .setMessageDigest(new String(Base64.getEncoder().encode(hashedString)));
    }

amount=1.01
date=2018-05-31
departmentalInfo.docNumber108=000000000000001
departmentalInfo.drawerStatus101=01
departmentalInfo.kbk=18210102010011000110
departmentalInfo.oktmo=45902000
departmentalInfo.paymentKind110=НС
departmentalInfo.reasonCode106=ТП
departmentalInfo.uip=0
externalId=22a6dd81-103a-4d3a-8e9b-0ba4b527f5f6
incomeTypeCode=2
operationCode=01
payeeAccount=40702810564564564531
payeeBankBic=040173745
payeeBankCorrAccount=30101810800000000745
payeeInn=7723870785
payeeKpp=553453453
payeeName=Общество с ограниченной ответственностью "Получатель"
payerAccount=40702810600010800068
payerBankBic=044525593
payerBankCorrAccount=30101810200000000593
payerInn=7728168971
payerKpp=770801001
payerName=Общество с ограниченной ответственностью "Клиент"
priority=5
purpose=Оплата заказа №1. НДС не облагается.