Question

I’m converting the following Perl script to Java. Please explain what it does and the best approach via Java.

#!/usr/bin/perl -w

use MIME::Base64;
use Convert::BinHex;

print encode_base64(pack "H*", "06d8f33b9c3dd94f8f45a5ef0bd54c63f0cd3113b7b5ebae79807041f7e2f8975352367266a926ea8a2a93ca");

Answer 1

Even though I don’t know Perl I’d make an informed guess that it takes binary data in hexadecimal form (where each byte is represented by two characters in the range [0-9a-f]) and converts it to a base 64 string.

In Java, you use DatatypeConverter::parseHexBinary and DatatypeConverter::printBase64Binary.

String hexData = "06d8f33b9c3dd94f8f45a5ef0bd54c63f0cd3113b7b5ebae79807041f7e2f8975352367266a926ea8a2a93ca";
String base64data = DatatypeConverter.printBase64Binary(
        DatatypeConverter.parseHexBinary(hexData));
System.out.println(base64data);