key12csp01.zip.enc зашифрован в адрес получателя k1707g12
key01csp12.zip.enc зашифрован в адрес получателя k1708g01
key01cspstrong.zip.enc зашифрован в адрес получателя k1708g01

import ru.CryptoPro.CAdES.EnvelopedSignature;
import ru.CryptoPro.JCP.JCP;
import ru.CryptoPro.JCP.tools.Array;

import java.io.ByteArrayInputStream;
import java.io.FileOutputStream;

import java.security.KeyStore;
import java.security.PrivateKey;
import java.security.cert.X509Certificate;

public class AndyPhCheck {

    private static final String PATH = "<папка_с_файлами>\";

    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);

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

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

        PrivateKey privateKey = (PrivateKey) keyStore.getKey(alias, password);
        X509Certificate cert = (X509Certificate) keyStore.getCertificate(alias);

        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 {

        decode("key12csp01.zip.enc", "key12csp01.decoded.zip", "k1707g12", null);
        decode("key01csp12.zip.enc", "key01csp12.decoded.zip", "k1708g01", null);
        decode("key01cspstrong.zip.enc", "key01cspstrong.decoded.zip", "k1708g01", null);

    }

}