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- KeyIter::revoked and KeyIter::key_flags (and its variants) didn't
take a time stamp so they could only be used for filtering keys
based on their current state, not their state at some time in the
past. Adding a time stamp to each of the filters would have fixed
the problem, but it would have made the interface ugly: callers
always want the same time stamp for all filters.
- Split KeyIter into two structures: a KeyIter and a ValidKeyIter.
- Add KeyIter::policy. It takes a time stamp, which is then used
for filters like `alive` and `revoked`, and it returns a
ValidKeyIter, which exposes filters that require a time stamp.
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- Instead of giving a set of TPKs to the encryptor, hand in a set of
recipients, which are (keyid, key)-tuples, conveniently created
from key queries over TPKs. This simplifies the encryptor, and
makes the key selection explicit.
- Drop the EncryptionMode type.
- As a nice side effect, we can now generate encrypted messages with
wildcard recipient addresses.
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