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agent:kem: More fix for PQC KEM with X448.

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* agent/pkdecrypt.c (struct ecc_params): Remove NAME_LEN field.
(ecc_table): Update.
(get_ecc_params): Use strcmp.
(composite_pgp_kem_decrypt): Fix the call of gnupg_kem_combiner.

--

Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
This commit is contained in:
NIIBE Yutaka 2024-04-23 16:09:02 +09:00
parent 65833eefb2
commit af98a3e5fa
No known key found for this signature in database
GPG Key ID: 640114AF89DE6054
1 changed files with 16 additions and 17 deletions
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33
agent/pkdecrypt.c
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@ -175,7 +175,6 @@ reverse_buffer (unsigned char *buffer, unsigned int length)
struct ecc_params
{
int name_len;
const char *curve;
size_t pubkey_len; /* Pubkey in the SEXP representation. */
size_t scalar_len;
@ -189,39 +188,39 @@ struct ecc_params
static const struct ecc_params ecc_table[] =
{
{
10, "Curve25519",
"Curve25519",
33, 32, 32, 32,
GCRY_MD_SHA3_256, GCRY_KEM_RAW_X25519,
1
},
{
4, "X448",
"X448",
56, 56, 56, 64,
GCRY_MD_SHA3_512, GCRY_KEM_RAW_X448,
0
},
{
15, "brainpoolP256r1",
"brainpoolP256r1",
65, 32, 65, 32,
GCRY_MD_SHA3_256, GCRY_KEM_RAW_BP256,
0
},
{
15, "brainpoolP384r1",
"brainpoolP384r1",
97, 48, 97, 64,
GCRY_MD_SHA3_512, GCRY_KEM_RAW_BP384,
0
},
{ 0, NULL, 0, 0, 0, 0, 0, 0, 0 }
{ NULL, 0, 0, 0, 0, 0, 0, 0 }
};
static const struct ecc_params *
get_ecc_params (const char *curve, size_t curve_len)
get_ecc_params (const char *curve)
{
int i, name_len;
int i;
for (i = 0; (name_len = ecc_table[i].name_len); i++)
if (name_len == curve_len && !memcmp (ecc_table[i].curve, curve, name_len))
for (i = 0; ecc_table[i].curve; i++)
if (!strcmp (ecc_table[i].curve, curve))
return &ecc_table[i];
return NULL;
@ -292,7 +291,7 @@ composite_pgp_kem_decrypt (ctrl_t ctrl, const char *desc_text,
gcry_buffer_t fixed_info = { 0, 0, 0, NULL };
gcry_sexp_t curve = NULL;
const char *curve_name;
char *curve_name = NULL;
err = agent_key_from_file (ctrl, NULL, desc_text,
ctrl->keygrip, &shadow_info,
@ -347,8 +346,8 @@ composite_pgp_kem_decrypt (ctrl_t ctrl, const char *desc_text,
goto leave;
}
curve_name = gcry_sexp_nth_data (curve, 1, &len);
ecc = get_ecc_params (curve_name, len);
curve_name = gcry_sexp_nth_string (curve, 1);
ecc = get_ecc_params (curve_name);
if (!ecc)
{
if (opt.verbose)
@ -436,7 +435,7 @@ composite_pgp_kem_decrypt (ctrl_t ctrl, const char *desc_text,
log_printhex (ecc_ecdh, ecc->point_len, "ECC ecdh:");
err = gnupg_ecc_kem_kdf (ecc_ss, ecc->shared_len, ecc->hash_algo,
ecc_ecdh, ecc->scalar_len, ecc_ct, ecc->point_len,
ecc_ecdh, ecc->point_len, ecc_ct, ecc->point_len,
ecc_pk, ecc->point_len);
if (err)
{
@ -509,9 +508,8 @@ composite_pgp_kem_decrypt (ctrl_t ctrl, const char *desc_text,
/* Then, combine two shared secrets and ciphertexts into one KEK */
err = gnupg_kem_combiner (kek, kek_len,
ecc_ss, 32, ecc_ct, 32,
mlkem_ss, GCRY_KEM_MLKEM768_SHARED_LEN,
mlkem_ct, GCRY_KEM_MLKEM768_CIPHER_LEN,
ecc_ss, ecc->shared_len, ecc_ct, ecc->point_len,
mlkem_ss, mlkem_ss_len, mlkem_ct, mlkem_ct_len,
fixed_info.data, fixed_info.size);
if (err)
{
@ -577,6 +575,7 @@ composite_pgp_kem_decrypt (ctrl_t ctrl, const char *desc_text,
mpi_release (encrypted_sessionkey_mpi);
gcry_free (fixed_info.data);
gcry_sexp_release (curve);
xfree (curve_name);
gcry_sexp_release (s_skey0);
gcry_sexp_release (s_skey1);
return err;