No CRC24 Checksum for v6

[TJ-91]

https://datatracker.ietf.org/doc/html/draft-ietf-openpgp-crypto-refresh-08#name-optional-checksum

• An ASCII-armored Encrypted Message packet sequence that ends in an v2 SEIPD packet MUST NOT contain a CRC24 footer.
• An ASCII-armored sequence of Signature packets that only includes v6 Signature packets MUST NOT contain a CRC24 footer.
• An ASCII-armored Transferable Public Key packet sequence of a v6 key MUST NOT contain a CRC24 footer.
• An ASCII-armored keyring consisting of only v6 keys MUST NOT contain a CRC24 footer.

[falko-strenzke]

@TJ-91 I this still open?

[TJ-91]

Yes the armoring is still not updated

[falko-strenzke]

OK, for all the remaining open issues we should also as the upstream project how/where we should document them for them. We'll leave this open for now.