Firstly this should probably now live under 'org.wildfly.security.util' however should it be better integrated with the existing content here as really it is just an alternative base.

Additional control that may be desirable is selection of the alphabet, depending on the reason for the conversion specifying the case may be desirable.

Secondly there may be a desire to control formatting: -

• Option to prefix each pair with 0x
• Between each pair use a space as a delimiter.
• Between each pair use ':' as a delimiter.

After x number of pairs the option to insert a newline into the String.

This list is primarily about creating different presentation representations, being able to decode all these formats could be a nice to have but not essential.