import ru.CryptoPro.CAdES.EnvelopedSignature;
import ru.CryptoPro.CAdES.exception.EnvelopedException;
import ru.CryptoPro.Crypto.CryptoProvider;
import ru.CryptoPro.JCP.JCP;
import ru.CryptoPro.JCP.KeyStore.HDImage.HDImageStore;
import ru.CryptoPro.JCP.tools.Array;
import ru.CryptoPro.reprov.RevCheck;
import ru.CryptoPro.ssl.Provider;

import java.io.ByteArrayInputStream;
import java.io.FileOutputStream;
import java.security.KeyStore;
import java.security.PrivateKey;
import java.security.Security;
import java.security.cert.X509Certificate;

public class TestDecode {

    private static final String PATH = System.getProperty("user.dir") + "/src/cryptotest/";

    private static void decode(
            String encodedFile, String decodedFile, String alias, char[] password) throws Exception {

        System.out.println("Decrypting " + encodedFile);
        byte[] encoded = Array.readFile(PATH + encodedFile);

        var bais = new ByteArrayInputStream(encoded);
        EnvelopedSignature envelopedSignature = new EnvelopedSignature(bais);

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

        PrivateKey privateKey = null;
        try {
            privateKey = (PrivateKey) keyStore.getKey(alias, password);
        } catch (Exception e) {
            e.printStackTrace();
        }
        X509Certificate cert = (X509Certificate) keyStore.getCertificate(alias);

        if (null == privateKey || null == cert) {
            throw new Exception("нет ключа или серта"); // При обращении к моему контейнеру и cert и privateKey равны null
        }

        FileOutputStream decoded = new FileOutputStream(PATH + decodedFile);
        envelopedSignature.decrypt(cert, privateKey, decoded);

        decoded.close();
        System.out.println("Decrypted.");
    }

    public static void main(String[] args) throws Exception, EnvelopedException {

        Security.addProvider(new JCP()); // JCP
        Security.addProvider(new RevCheck()); // RevCheck
        Security.addProvider(new CryptoProvider()); // JCryptoP
        Security.addProvider(new Provider()); // JTLS

        HDImageStore.setDir(PATH);

        decode("123123123.txt.enc", "123123123.txt", "ec8cdfb5", null); // Мой контейнер
        // decode("key12csp01.zip.enc", "key12csp01.decoded.zip", "k1707g12", null); // Контейнер из https://www.cryptopro.ru/forum2/default.aspx?g=posts&t=12596
    }
}