How to protect Google Play public key when doing InApp Billing

Question

Actually this is a little bit silly about protecting public key (what is the definition of public key then?) but as per the documentation by Google:

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Answer 1

The public key is base64-encoded ([a-zA-Z0-9+/]) so you can easily avoid the need to escape the obfuscated string at all as is an annoying problem in @PointerNull's solution.

Instead, you can perform the obfuscation by first converting the character in question to a 6-bit int. Then do the bit manipulation (e.g. XOR-ing) and then convert back to a base64-encoded char. Guaranteed no character escaping needed.