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kbx: Support kyber in the blob parser.

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* kbx/keybox-openpgp.c (keygrip_from_keyparm): Support Kyber.
(parse_key): Ditto.
--

GnuPG-bug-id: 6815
This commit is contained in:
Werner Koch 2024-04-09 10:54:34 +02:00
parent 3a344d6236
commit 1a37f0080b
No known key found for this signature in database
GPG Key ID: E3FDFF218E45B72B
2 changed files with 44 additions and 4 deletions
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2
kbx/keybox-blob.c
View File

@ -96,7 +96,7 @@
bit 0 = qualified signature (not yet implemented}
bit 7 = 32 byte fingerprint in use.
- u16 RFU
- b20 keygrip
- b20 keygrip FIXME: Support a second grip.
- bN Optional filler up to the specified length of this
structure.
- u16 Size of the serial number (may be zero)

46
kbx/keybox-openpgp.c
View File

@ -233,6 +233,26 @@ keygrip_from_keyparm (int algo, struct keyparm_s *kp, unsigned char *grip)
}
break;
case PUBKEY_ALGO_KYBER:
/* There is no space in the BLOB for a second grip, thus for now
* we store only the ECC keygrip. */
{
char *curve = openpgp_oidbuf_to_str (kp[0].mpi, kp[0].len);
if (!curve)
err = gpg_error_from_syserror ();
else
{
err = gcry_sexp_build
(&s_pkey, NULL,
openpgp_oidbuf_is_cv25519 (kp[0].mpi, kp[0].len)
?"(public-key(ecc(curve%s)(flags djb-tweak)(q%b)))"
: "(public-key(ecc(curve%s)(q%b)))",
curve, kp[1].len, kp[1].mpi);
xfree (curve);
}
}
break;
default:
err = gpg_error (GPG_ERR_PUBKEY_ALGO);
break;
@ -273,6 +293,7 @@ parse_key (const unsigned char *data, size_t datalen,
unsigned char hashbuffer[768];
gcry_md_hd_t md;
int is_ecc = 0;
int is_kyber = 0;
int is_v5;
/* unsigned int pkbytes; for v5: # of octets of the public key params. */
struct keyparm_s keyparm[OPENPGP_MAX_NPKEY];
@ -331,6 +352,10 @@ parse_key (const unsigned char *data, size_t datalen,
npkey = 2;
is_ecc = 1;
break;
case PUBKEY_ALGO_KYBER:
npkey = 3;
is_kyber = 1;
break;
default: /* Unknown algorithm. */
return gpg_error (GPG_ERR_UNKNOWN_ALGORITHM);
}
@ -345,7 +370,8 @@ parse_key (const unsigned char *data, size_t datalen,
if (datalen < 2)
return gpg_error (GPG_ERR_INV_PACKET);
if (is_ecc && (i == 0 || i == 2))
if ((is_ecc && (i == 0 || i == 2))
|| (is_kyber && i == 0 ))
{
nbytes = data[0];
if (nbytes < 2 || nbytes > 254)
@ -354,6 +380,20 @@ parse_key (const unsigned char *data, size_t datalen,
if (datalen < nbytes)
return gpg_error (GPG_ERR_INV_PACKET);
keyparm[i].mpi = data;
keyparm[i].len = nbytes;
}
else if (is_kyber && i == 2)
{
if (datalen < 4)
return gpg_error (GPG_ERR_INV_PACKET);
nbytes = ((data[0]<<24)|(data[1]<<16)|(data[2]<<8)|(data[3]));
data += 4;
datalen -= 4;
/* (for the limit see also MAX_EXTERN_MPI_BITS in g10/gpg.h) */
if (datalen < nbytes || nbytes > (32768*8))
return gpg_error (GPG_ERR_INV_PACKET);
keyparm[i].mpi = data;
keyparm[i].len = nbytes;
}
@ -378,7 +418,7 @@ parse_key (const unsigned char *data, size_t datalen,
/* Note: Starting here we need to jump to leave on error. */
/* For non-ECC, make sure the MPIs are unsigned. */
if (!is_ecc)
if (!is_ecc && !is_kyber)
for (i=0; i < npkey; i++)
{
if (!keyparm[i].len || (keyparm[i].mpi[0] & 0x80))
@ -438,7 +478,7 @@ parse_key (const unsigned char *data, size_t datalen,
*/
if (version == 5)
{
if ( 5 + n < sizeof hashbuffer )
if (5 + n < sizeof hashbuffer )
{
hashbuffer[0] = 0x9a; /* CTB */
hashbuffer[1] = (n >> 24);/* 4 byte length header. */