在Java -Output 16字符中生成MD5哈希 [英] Generate MD5 hash in Java -Output 16 character

问题描述

我已经创建了MD5 hash.Its现在工作正常。我希望输出16个字符。当前代码返回32个字符。

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

这是我的代码：

    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);
        }

我要更改的地方。

如何获得16个字符的输出。？

How can i get the 16 character output.?

提前致谢;

推荐答案

将字符串剪切为长度： digest1 = digest1.substring（0,16）;

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

MD5输出16个字节。如果用十六进制编码，则为32个字符。如果你用base-64编码它是24个字符。 Base-85将它挤成20个字符。没有众所周知的编码，即每个字节一个字符。

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.

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