try {
/* Signer Sample */
System.out.println("[Signer Sample]");
customSigner = new CustomSigner();
System.out.printf("Sign message : [%s]\n", new String(msg));
signBytes = customSigner.signMessage(msg);
System.out
.println("Sign message OK, check now signature validty...");
if (customSigner.isValid(msg, signBytes)) {
System.out.println("OK - Message signature is valid !");
} else {