GitLab

Co-authored-by: David Goulet <dgoulet@torproject.org>

Co-authored-by: David Goulet <dgoulet@torproject.org>

These necessitated a little complexity for our circuit
creation/extension API; we might want to refactor that down the
road.

Closes #49.

Found by fuzzing: without doing this, there are ways to make the
SocksHandshake panic.  I don't think any of them are reachable from
the network assuming this crate is used correctly, but let's be safer.

Had to refactor a few methods for database access, and fix a bug
where we were storing valid_until times with the wrong information.

self is no longer mutable.
Co-authored-by: David Goulet <dgoulet@torproject.org>

This prevents some overflow cases; found by fuzzing.

This fuzzer checks both implementations and makes sure they give
the same result.