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gpg: Prepare to use the fingerprint as fixed-info for Kyber.

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* g10/pubkey-enc.c (get_it): Use algo and fingerprint for the
fixed-info.  Keep a testing mode.
* g10/options.h (COMPAT_T7014_OLD): New.
* g10/gpg.c (compatibility_flags): Add "t71014-old" flag.
--

GnuPG-bug-id: 6815
This commit is contained in:
Werner Koch 2024-04-12 11:31:01 +02:00
parent 6f94fe01a9
commit b48476bbef
No known key found for this signature in database
GPG key ID: E3FDFF218E45B72B
3 changed files with 22 additions and 8 deletions
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24
g10/pubkey-enc.c
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@ -240,15 +240,29 @@ get_it (ctrl_t ctrl,
}
else if (sk->pubkey_algo == PUBKEY_ALGO_KYBER)
{
log_debug ("seskey_algo: %d\n", enc->seskey_algo);
char fixedinfo[1+MAX_FINGERPRINT_LEN];
int fixedlen;
if ((opt.compat_flags & COMPAT_T7014_OLD))
{
/* Temporary use for tests with original test vectors. */
fixedinfo[0] = 0x69;
fixedlen = 1;
}
else
{
fixedinfo[0] = enc->seskey_algo;
v5_fingerprint_from_pk (sk, fixedinfo+1, NULL);
fixedlen = 33;
}
if (!enc->data[0] || !enc->data[1] || !enc->data[2])
err = gpg_error (GPG_ERR_BAD_MPI);
else
err = gcry_sexp_build (&s_data, NULL,
"(enc-val(pqc(e%m)(k%m)(s%m)(c%d)(fixed-info%s)))",
enc->data[0], enc->data[1], enc->data[2],
enc->seskey_algo,
"\x69");
"(enc-val(pqc(e%m)(k%m)(s%m)(c%d)(fixed-info%b)))",
enc->data[0], enc->data[1], enc->data[2],
enc->seskey_algo, fixedlen, fixedinfo);
}
else
err = gpg_error (GPG_ERR_BUG);