gpg: Implement a parser for Kyber encrypted packets.
6fab7b075adf
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Description

gpg: Implement a parser for Kyber encrypted packets.

* g10/misc.c (pubkey_get_nenc): Add ky768 and ky1024 values.
* g10/parse-packet.c (read_octet_string): New.
(read_size_body): Rename to ...
(read_sized_octet_string): this and change args to update-able PKTLEN.
(parse_pubkeyenc): Split general parsing loop for easier reading.
Implement parser for the Kyber algorithms.

Take care: this has not been tested at all, it merely passes the
regression test for the other algos.

Kyber is also known as ML-KEM in FIPS-203.

The list mode is slighly changed: In case of a parsing error no data
is printed - before that already parsed data was printed.