public static byte[] hexStringToByteArray(String s) {
int len = s.length();
byte[] data = new byte[len / 2];
for (int i = 0; i < len; i += 2)
{
data[i / 2] = (byte) ((Character.digit(s.charAt(i), 16)
Подробнее здесь: [url]https://stackoverflow.com/questions/78312551/decrypt-a-java-encrypted-file-in-python[/url]