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POOdd format of Message Authentication Code output
 

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  1. POOdd format of Message Authentication Code output
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    <p>I'm running an example from an IBM tutorial which has a simple example to generate a MAC on given plain text. The code is as follows:</p> <pre><code>public static void main(String[] args) throws Exception { // // check args and get plaintext if (args.length != 1) { System.err .println("Usage: java MessageAuthenticationCodeExample text"); System.exit(1); } byte[] plainText = args[0].getBytes("UTF8"); // // get a key for the HmacMD5 algorithm System.out.println("\nStart generating key"); KeyGenerator keyGen = KeyGenerator.getInstance("HmacMD5"); SecretKey MD5key = keyGen.generateKey(); System.out.println("Finish generating key"); // // get a MAC object and update it with the plaintext Mac mac = Mac.getInstance("HmacMD5"); mac.init(MD5key); mac.update(plainText); // // print out the provider used and the MAC System.out.println("\n" + mac.getProvider().getInfo()); System.out.println("\nMAC: "); System.out.println(new String(mac.doFinal(), "UTF8")); } </code></pre> <p>That's all good but running it with the String arg "This is a test" I get the following output:</p> <p><img src="https://i.stack.imgur.com/pF4gx.png" alt="enter image description here"></p> <p>In the actual tutorial the MAC output is formatted much more nicely as e.g.</p> <pre><code> MAC: Dkdj47x4#.@kd#n8a-x&gt; </code></pre> <p>, by nicely I mean characters that I actually recognize! </p> <p>I thought the use of "UTF8" parameter served this purpose but I have probably got it wrong so can anyone tell me how I get the output to format like above?</p>
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