/** External signing example */ public static void main(String[] args) throws Exception { System.setProperty("digidoc4j.mode", "TEST"); Configuration configuration = new Configuration(Configuration.Mode.TEST); Container container = ContainerBuilder.aContainer() .withConfiguration(configuration) .withDataFile("testFiles/test.txt", "text/plain") .build(); SignatureToken externalSigner = new ExternalSigner(getSignerCert()) { @Override public byte[] sign(DigestAlgorithm digestAlgorithm, byte[] dataToSign) { // IMPLEMENT YOUR EXTERNAL SIGNING HERE try { KeyStore keyStore = KeyStore.getInstance("PKCS12"); try (FileInputStream stream = new FileInputStream("testFiles/signout.p12")) { keyStore.load(stream, "test".toCharArray()); } PrivateKey privateKey = (PrivateKey) keyStore.getKey("1", "test".toCharArray()); final String javaSignatureAlgorithm = "NONEwith" + privateKey.getAlgorithm(); return DSSUtils.encrypt(javaSignatureAlgorithm, privateKey, addPadding(dataToSign)); } catch (Exception e) { throw new DigiDoc4JException("Loading private key failed"); } } private byte[] addPadding(byte[] digest) { return ArrayUtils.addAll(SHA256.digestInfoPrefix(), digest); } }; Signature signature = SignatureBuilder.aSignature(container).withSignatureToken(externalSigner).invokeSigning(); container.addSignature(signature); container.save("prototype.bdoc"); }