public static void main(String[] args)
throws KeyStoreException, NoSuchAlgorithmException, CertificateException, IOException,
NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException,
InvalidKeyException, UnrecoverableKeyException, NoSuchProviderException,
SignatureException {
/** At the client side */
KeyStoreUtil keyStoreUtil = new KeyStoreUtil();
// Generate Symmetric key
byte[] symmetrickey = keyStoreUtil.generateSessionKey();
// Encrypt data by symmetric key
String data = "ABC";
System.out.println("Data : " + data);
String encryptedData = keyStoreUtil.encryptWithAESKey(data, symmetrickey);
System.out.println("encryptedData : " + encryptedData);
// Encrypt symmetric key using trustore
String encryptedKey = keyStoreUtil.encryptKey(symmetrickey, "mykey");
System.out.println("encryptedKey : " + encryptedKey);
// Generate the signature of symmetric key
byte[] signedEncryptedKey = keyStoreUtil.signData(Base64.decodeBase64(encryptedKey));
String signatureOfKey = Base64.encodeBase64String(signedEncryptedKey);
System.out.println("Signed Ecrypted Key : " + signatureOfKey);
/** At the receiver */
// Verify signature
keyStoreUtil.verifySignature(Base64.decodeBase64(encryptedKey), signedEncryptedKey);
// Decrypt symmteric key using keystore
String decryptedKey = keyStoreUtil.decryptKey(encryptedKey, "mykey");
System.out.println("decryptedKey : " + decryptedKey);
// Decrypt data using decrypted symetric key
System.out.println(
"Decrypted Data : " + keyStoreUtil.decryptWithAESKey(encryptedData, decryptedKey));
}
