Cryptographic objects are not easily convertible to JSON

[PeterHamilton]

Cryptographic objects can be dumped to a JSON-like format using str but there are often punctuation oddities that yield invalid JSON. Identify and fix these.

[KBassford]

If it helps, the punctuation oddities are originating from the repr blocks for each object. Building everything into a single string (with embedded bytes object for the "value") would probably fix everything.