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Fixes #25

Co-authored-by: Koen van Ingen <koenvaningen@gmail.com>

JWTs use URL-encoded base64 (with - _ instead of + /). This fixes parsing bugs
that would occur when issuing attributes containing certain non-alphanumeric
characters like ~.

Fixes #24.
Co-authored-by: Koen van Ingen <koenvaningen@gmail.com>

Co-authored-by: Confiks <confiks@scriptbase.org>

When downloading a new public key of an issuer of which some public keys had already been used, the new public key would not be parsed resulting in a nil deref during keyshare sessions.

When downloading a new public key of an issuer of which some public keys had already been used, the new public key would not be parsed resulting in a nil deref during keyshare sessions.