Add Base16 (Hex) and Base64 encoding and decoding capabilities about caesar HOT 3 CLOSED

Base64 encoding/decoding should be Basic.

If the user wants to read a Base64 MIME encoded file, he or she can do it this way in Java 9 or later:

byte[] decodedBytes = Base64.getMimeDecoder().wrap(/*InputStream*/).readAllBytes();

decodedBytes can then be further used by Caesar.

The procedure is analogous for encoding.

from caesar.

Hex string need not be even length. As a consequence, different length strings may result in the same byte array.

This library should be able to parse all valid hex strings.

The simplest way to encode a byte array to an even length string:

// byte[] array = ...
StringBuilder sb = new StringBuilder();
for (byte b : array) {
    sb.append(String.format("%02X", b));
}
String result = sb.toString();

What to do with empty strings ("")?

from caesar.

Base64 support will be dropped. It is easy enough for the user of this library to convert a Base64 string to a byte array (and vice versa) using the Java SE API version 8 or later.

from caesar.