android - Python代码转为java代码？

Question

下面是一段Python的加密代码 ：

import md5
def encrypted_id(id):
    byte1 = bytearray('3go8&$8*3*3h0k(2)2')
    byte2 = bytearray(id)
    byte1_len = len(byte1)
    for i in xrange(len(byte2)):
        byte2[i] = byte2[i]^byte1[i%byte1_len]
    m = md5.new()
    m.update(byte2)
    result = m.digest().encode('base64')[:-1]
    result = result.replace('/', '_')
    result = result.replace('+', '-')
    return result

请问如何改写为java代码？
下面是我改写的java代码，但是返回的结果始终为空：

 public static String md5(String musicID) throws NoSuchAlgorithmException {
        System.out.print(musicID);
        String result;
        byte[] byte1, byte2;
        String word = "3go8&$8*3*3h0k(2)2";
        byte1 = word.getBytes();
        byte2 = musicID.getBytes();
        int byte2_len = byte2.length;
        int byte1_len=byte1.length;
        for (int i = 0; i < byte2_len; i++) {
            byte2[i] = (byte) (byte2[i] ^ byte1[i % byte1_len]);
        }
        MessageDigest md5 = MessageDigest.getInstance("MD5");
        md5.update(byte2);
        byte[] digest = md5.digest();
        result=new String(Base64.decodeBase64(digest));
        result = result.replace('/', '_');
        result = result.replace('+', '-');
        return result;
    }

Answer 1

python md5 is followed by base64 encode

java md5 is followed by base64 decode