public static Cipher newCipher(PrivateKey privateKey) throws Exception {
Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
cipher.init(Cipher.DECRYPT_MODE, privateKey);
return cipher;
}
public byte[] encrypt(byte[] clearMessage) throws Exception {
return _cipher.doFinal(clearMessage);
}
public byte[] decrypt(byte[] encryptedMessage) throws Exception {
return _cipher.doFinal(encryptedMessage);
}
private static Cipher newCipher(SecretKey symmetricKey, IvParameterSpec iv) throws Exception {
Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
cipher.init(Cipher.DECRYPT_MODE, symmetricKey, iv);
return cipher;
}