用Java生成MD5哈希-输出16个字符

Question

I have created MD5 hash.Its working fine now.I want output in 16 character.Current Code is returning 32 characters.

This is my code:

    try {
            String text = "Hello World";
            MessageDigest msg = MessageDigest.getInstance("MD5");
            msg.update(text.getBytes(), 0, text.length());
            String digest1 = new BigInteger(1, msg.digest()).toString(16);
            System.out.println("MD5: " + digest1.length());
            System.out.println("MD5: " + digest1);
        } catch (NoSuchAlgorithmException ex) {
            Logger.getLogger(AndroidActivationView.class.getName()).log(Level.SEVERE, null, ex);
        }

Where I want to change it.

How can i get the 16 character output.?

Thanks in advance;

Answer 1

Cut the string to length: digest1 = digest1.substring(0, 16);

MD5 outputs 16 bytes. If you encode it in hexadecimal, its 32 characters. If you encode it in base-64 it's 24 characters. Base-85 will squeeze it into 20 characters. There's no well-known encoding that is one character per byte.