implement crypto-refresh-10 #455
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… locked secret key
sigsubj objects have an "issues" bitfield, which follows the "Anna Karenina principle" instead of "verified" boolean.
as of 0.6.0, from_blob() methods will return non-functioning objects rather than raising an error directly.
"nested" semantically probably is meant to mean "another OPS packet follows". But the byte on the wire is defined as 0 means another OPS packet follows. Furthermore, the flags are set in the wrong way: before this commit, the code produced a series of OPS packets where the first packet had a different value for the flag than all subsequent ones. What we want is where all the flags *except* the last OPS packet (corresponding to the *first* Sig packet) are 0. See https://gitlab.com/sequoia-pgp/openpgp-interoperability-test-suite/-/issues/84
a PGPMessage object can contain more than one signature. Detached signatures should also be able to handle having more than one signature. https://www.ietf.org/archive/id/draft-ietf-openpgp-crypto-refresh-09.html#name-detached-signatures says: > These detached signatures are simply one or more Signature packets > stored separately from the data for which they are a signature. A PGPSignatures object makes the most sense to represent such a thing. Closes: SecurityInnovation#197
- serializing v6 keys is subtly different than v4 keys - v6 certs (or later) don't need a UID any longer - v6 signature salt length varies by hash algorithm
Note that for PKESKv3, they store their symmetric key in the clear, outside of the ciphertext. this allows us to avoid padding shenanigans on the cleartext.
See also the "Optional checksum" part of draft-ietf-openpgp-crypto-refresh-10)
… Argon2 (we also allow passing an explicit salt, which normally should not be used but is useful for generating deterministic test vectors)
This uses cached key generation, and ensures that we cover versions 4 and 6 of keys, as well as all the pubkey algorithms, and different possible feature sets (SEIPDv1 and SEIPDv2).
make this work even in the face of multiple passwords and keys
These pubkey objects are immutable, as noted in pyca/cryptography#9403, so it should be safe to just assign.
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draft-ietf-openpgp-crypto-refresh-10 makes it clear that even v4 OpenPGP certificates MAY not have a user ID. Keep a warning in place though, to encourage interoperability with legacy v4 implementations.
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This series tries to implement the new parts from draft-ietf-openpgp-crypto-refresh-10. It is based on #451, which restructures some of the internal mechanisms of PGPy to make these changes end up simpler.
I've tried to continue to keep the reasonable type signatures already present in #451, and to at least not introduce regressions in the type safety of the codebase. There are also some additional tests to try to ensure that things are at least internally consistent.