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gpg: Prepare Kyber encryption code for more variants.

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* common/openpgp-oid.c (oidtable): Add field kem_algo.
(openpgp_oid_to_kem_algo): New.
* g10/pkglue.c (do_encrypt_kem): Add support for Kyber1024.
--
GnuPG-bug-id: 6815
This commit is contained in:
Werner Koch 2024-04-18 14:37:40 +02:00
parent 7d6ad28667
commit ba3c873934
No known key found for this signature in database
GPG key ID: E3FDFF218E45B72B
3 changed files with 94 additions and 25 deletions
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28
common/openpgp-oid.c
View file

@ -45,14 +45,15 @@ static struct {
const char *alias; /* NULL or alternative name of the curve. */
const char *abbr; /* NULL or abbreviated name of the curve. */
int pubkey_algo; /* Required OpenPGP algo or 0 for ECDSA/ECDH. */
enum gcry_kem_algos kem_algo; /* 0 or the KEM algorithm for PQC. */
} oidtable[] = {
{ "Curve25519", "1.3.6.1.4.1.3029.1.5.1", 255, "cv25519", NULL,
PUBKEY_ALGO_ECDH },
PUBKEY_ALGO_ECDH, GCRY_KEM_RAW_X25519 /* only during development */},
{ "Ed25519", "1.3.6.1.4.1.11591.15.1", 255, "ed25519", NULL,
PUBKEY_ALGO_EDDSA },
{ "Curve25519", "1.3.101.110", 255, "cv25519", NULL,
PUBKEY_ALGO_ECDH },
PUBKEY_ALGO_ECDH, GCRY_KEM_RAW_X25519 },
{ "Ed25519", "1.3.101.112", 255, "ed25519", NULL,
PUBKEY_ALGO_EDDSA },
{ "X448", "1.3.101.111", 448, "cv448", NULL,
@ -542,6 +543,29 @@ openpgp_oid_or_name_to_curve (const char *oidname, int canon)
}
/* Return the KEM algorithm id for the curve with OIDNAME. */
enum gcry_kem_algos
openpgp_oid_to_kem_algo (const char *oidname)
{
int i;
if (!oidname)
return 0;
for (i=0; oidtable[i].name; i++)
if (!strcmp (oidtable[i].oidstr, oidname))
return oidtable[i].kem_algo;
for (i=0; oidtable[i].name; i++)
if (!ascii_strcasecmp (oidtable[i].name, oidname)
|| (oidtable[i].alias
&& !ascii_strcasecmp (oidtable[i].alias, oidname)))
return oidtable[i].kem_algo;
return 0;
}
/* Return true if the curve with NAME is supported. */
static int
curve_supported_p (const char *name)

1
common/util.h
View file

@ -227,6 +227,7 @@ int openpgp_oidbuf_is_cv25519 (const void *buf, size_t len);
int openpgp_oid_is_cv25519 (gcry_mpi_t a);
int openpgp_oid_is_cv448 (gcry_mpi_t a);
int openpgp_oid_is_ed448 (gcry_mpi_t a);
enum gcry_kem_algos openpgp_oid_to_kem_algo (const char *oidname);
const char *openpgp_curve_to_oid (const char *name,
unsigned int *r_nbits, int *r_algo);
const char *openpgp_oid_to_curve (const char *oid, int mode);