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gpg: Changed internal data format for Kyber.

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* g10/packet.h (PKT_pubkey_enc): Add field seskey_algo.
(struct pubkey_enc_list): Ditto.
* g10/misc.c (pubkey_get_nenc): Change value for Kyber from 4 to 3.
* g10/parse-packet.c (parse_pubkeyenc): Store the Kyber algo in the
new field and adjust data.  Do not store the length byte in data[2].
* g10/build-packet.c (do_pubkey_enc): Take the session algo for Kyber
from the new field.
* g10/encrypt.c (write_pubkey_enc): Ses the seskey_algo.
* g10/mainproc.c (proc_pubkey_enc): Copy it.
* g10/pubkey-enc.c (get_it): Support Kyber decryption.

* g10/seskey.c (encode_session_key): Handle Kyber different from ECDH.
--

Having always the single byte in the packet data than to store and
retrieve it from an MPI is much easier.  Thus this patch changes the
original internal format.  With this chnages decryption of the slighly
modified test data works now. See the bug tracker for test data.

GnuPG-bug-id: 6815
This commit is contained in:
Werner Koch 2024-04-11 15:56:21 +02:00
parent 61717fb0a7
commit 813f8d1b8e
No known key found for this signature in database
GPG key ID: E3FDFF218E45B72B
8 changed files with 104 additions and 42 deletions
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3
g10/packet.h
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@ -137,6 +137,8 @@ typedef struct {
byte version;
/* The algorithm used for the public key encryption scheme. */
byte pubkey_algo;
/* The session key algorithm used by some pubkey algos. */
byte seskey_algo;
/* Whether to hide the key id. This value is not directly
serialized. */
byte throw_keyid;
@ -151,6 +153,7 @@ struct pubkey_enc_list
struct pubkey_enc_list *next;
u32 keyid[2];
int pubkey_algo;
int seskey_algo;
int result;
gcry_mpi_t data[PUBKEY_MAX_NENC];
};