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gpg: Implement a parser for Kyber encrypted packets.

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* 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.

GnuPG-bug-id: 6815
This commit is contained in:
Werner Koch 2023-11-13 16:10:05 +01:00
parent ec1446f944
commit 6fab7b075a
No known key found for this signature in database
GPG key ID: E3FDFF218E45B72B
3 changed files with 137 additions and 54 deletions
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12
common/openpgpdefs.h
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@ -169,11 +169,11 @@ typedef enum
PUBKEY_ALGO_ELGAMAL = 20, /* Elgamal encrypt+sign (legacy). */
/* 21 reserved by OpenPGP. */
PUBKEY_ALGO_EDDSA = 22, /* EdDSA. */
PUBKEY_ALGO_KY768_25519 = 29, /* Kyber768 + X25519 */
PUBKEY_ALGO_KY1024_448 = 30, /* Kyber1024 + X448 */
PUBKEY_ALGO_DIL3_25519 = 35, /* Dilithium3 + Ed25519 */
PUBKEY_ALGO_DIL5_448 = 36, /* Dilithium5 + Ed448 */
PUBKEY_ALGO_SPHINX_SHA2 = 41, /* SPHINX+-simple-SHA2 */
PUBKEY_ALGO_KY768_25519 = 29, /* Kyber768 + X25519 (aka ML-KEM-768) */
PUBKEY_ALGO_KY1024_448 = 30, /* Kyber1024 + X448 (aka ML-KEM-1024) */
PUBKEY_ALGO_DIL3_25519 = 35, /* Dilithium3 + Ed25519 (aka ML-DSA-65) */
PUBKEY_ALGO_DIL5_448 = 36, /* Dilithium5 + Ed448 (aka ML-DSA-87) */
PUBKEY_ALGO_SPHINX_SHA2 = 41, /* SPHINX+-simple-SHA2 (aka SLH-DSA-SHA2) */
PUBKEY_ALGO_PRIVATE10 = 110
}
pubkey_algo_t;
@ -208,7 +208,7 @@ compress_algo_t;
#define OPENPGP_MAX_NPKEY 5 /* Maximum number of public key parameters. */
#define OPENPGP_MAX_NSKEY 7 /* Maximum number of secret key parameters. */
#define OPENPGP_MAX_NSIG 2 /* Maximum number of signature parameters. */
#define OPENPGP_MAX_NENC 2 /* Maximum number of encryption parameters. */
#define OPENPGP_MAX_NENC 4 /* Maximum number of encryption parameters. */
/* Decode an rfc4880 encoded S2K count. */