code: @Override
  	public byte[] calculateSHA256HMAC(byte[] data, int offset, int length,
  			byte[] aKey) {
  		return BCHmacAdapter.hmac(data, offset, length, aKey, "HmacSHA256");
  	}
docs: /* (non-Javadoc)
  @see zorg.platform.CryptoUtils#calculateSHA256HMAC(byte[], int, int, byte[])