String filePath = "<path>"; // путь к файлу

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

PrivateKey privateKey = (PrivateKey) keyStore.getKey("romashka1", null);
X509Certificate cert  = (X509Certificate) keyStore.getCertificate("romashka1");

byte[] encrypted_data = Array.readFile(filePath + "e295700952234a8aa27471401a0f7192.txt");

EnvelopedSignature envelopedSignature = new EnvelopedSignature(new ByteArrayInputStream(encrypted_data));
ByteArrayOutputStream decryptedByteDataStream = new ByteArrayOutputStream();

envelopedSignature.decrypt(cert, privateKey, decryptedByteDataStream);
byte[] decrypted_data = decryptedByteDataStream.toByteArray(); // расшифрованные данные

Array.writeFile(filePath + "decrypted.zip", decrypted_data);