/**
* gnutls_dh_params_import_raw:
* @dh_params: The parameters
* @prime: holds the new prime
* @generator: holds the new generator
*
* This function will replace the pair of prime and generator for use
* in the Diffie-Hellman key exchange. The new parameters should be
* stored in the appropriate gnutls_datum.
*
* Returns: On success, %GNUTLS_E_SUCCESS (0) is returned,
* otherwise a negative error code is returned.
**/
int
gnutls_dh_params_import_raw(gnutls_dh_params_t dh_params,
const gnutls_datum_t * prime,
const gnutls_datum_t * generator)
{
return gnutls_dh_params_import_raw2(dh_params, prime, generator, 0);
}
/**
* gnutls_dh_params_import_dsa:
* @dh_params: The parameters
* @key: holds a DSA private key
*
* This function will import the prime and generator of the DSA key for use
* in the Diffie-Hellman key exchange.
*
* Returns: On success, %GNUTLS_E_SUCCESS (0) is returned,
* otherwise a negative error code is returned.
**/
int
gnutls_dh_params_import_dsa(gnutls_dh_params_t dh_params, gnutls_x509_privkey_t key)
{
gnutls_datum_t p, g, q;
bigint_t tmp_q;
int ret;
ret = gnutls_x509_privkey_export_dsa_raw(key, &p, &q, &g, NULL, NULL);
if (ret < 0)
return gnutls_assert_val(ret);
ret = _gnutls_mpi_init_scan_nz(&tmp_q, q.data, q.size);
if (ret < 0) {
gnutls_assert();
ret = GNUTLS_E_MPI_SCAN_FAILED;
goto cleanup;
}
ret = gnutls_dh_params_import_raw2(dh_params, &p, &g, _gnutls_mpi_get_nbits(tmp_q));
_gnutls_mpi_release(&tmp_q);
cleanup:
gnutls_free(p.data);
gnutls_free(g.data);
gnutls_free(q.data);
return ret;
}
/* If how is zero then the included parameters are used.
*/
int generate_prime(FILE * outfile, int how, common_info_st * info)
{
int ret;
gnutls_dh_params_t dh_params;
gnutls_datum_t p, g;
int bits = get_bits(GNUTLS_PK_DH, info->bits, info->sec_param, 1);
unsigned int q_bits = 0, key_bits = 0;
fix_lbuffer(0);
gnutls_dh_params_init(&dh_params);
if (how != 0) {
fprintf(stderr, "Generating DH parameters (%d bits)...\n",
bits);
fprintf(stderr, "(might take long time)\n");
} else
fprintf(stderr, "Retrieving DH parameters...\n");
if (how != 0) {
if (info->provable != 0) {
gnutls_x509_privkey_t pkey;
unsigned save;
ret = gnutls_x509_privkey_init(&pkey);
if (ret < 0) {
fprintf(stderr,
"Error initializing key: %s\n",
gnutls_strerror(ret));
exit(1);
}
if (info->seed_size > 0) {
gnutls_keygen_data_st data;
if (info->seed_size < 32) {
fprintf(stderr, "For DH parameter generation a 32-byte seed value or larger is expected (have: %d); use -d 2 for more information.\n", (int)info->seed_size);
exit(1);
}
data.type = GNUTLS_KEYGEN_SEED;
data.data = (void*)info->seed;
data.size = info->seed_size;
ret = gnutls_x509_privkey_generate2(pkey, GNUTLS_PK_DSA, bits, GNUTLS_PRIVKEY_FLAG_PROVABLE, &data, 1);
} else {
ret = gnutls_x509_privkey_generate(pkey, GNUTLS_PK_DSA, bits, GNUTLS_PRIVKEY_FLAG_PROVABLE);
}
if (ret < 0) {
fprintf(stderr,
"Error generating DSA parameters: %s\n",
gnutls_strerror(ret));
exit(1);
}
if (info->outcert_format == GNUTLS_X509_FMT_PEM) {
save = info->no_compat;
info->no_compat = 1;
print_private_key(outfile, info, pkey);
info->no_compat = save;
}
ret = gnutls_dh_params_import_dsa(dh_params, pkey);
if (ret < 0) {
fprintf(stderr,
"Error importing DSA parameters: %s\n",
gnutls_strerror(ret));
exit(1);
}
gnutls_x509_privkey_deinit(pkey);
} else {
ret = gnutls_dh_params_generate2(dh_params, bits);
if (ret < 0) {
fprintf(stderr,
"Error generating parameters: %s\n",
gnutls_strerror(ret));
exit(1);
}
}
ret =
gnutls_dh_params_export_raw(dh_params, &p, &g,
&q_bits);
if (ret < 0) {
fprintf(stderr, "Error exporting parameters: %s\n",
gnutls_strerror(ret));
exit(1);
}
} else {
if (info->provable != 0) {
fprintf(stderr, "The DH parameters obtained via this option are not provable\n");
exit(1);
}
#if defined(ENABLE_DHE) || defined(ENABLE_ANON)
if (bits <= 2048) {
p = gnutls_ffdhe_2048_group_prime;
g = gnutls_ffdhe_2048_group_generator;
key_bits = gnutls_ffdhe_2048_key_bits;
bits = 2048;
} else if (bits <= 3072) {
p = gnutls_ffdhe_3072_group_prime;
g = gnutls_ffdhe_3072_group_generator;
key_bits = gnutls_ffdhe_3072_key_bits;
bits = 3072;
} else if (bits <= 4096) {
p = gnutls_ffdhe_4096_group_prime;
g = gnutls_ffdhe_4096_group_generator;
key_bits = gnutls_ffdhe_4096_key_bits;
bits = 4096;
} else {
p = gnutls_ffdhe_8192_group_prime;
g = gnutls_ffdhe_8192_group_generator;
key_bits = gnutls_ffdhe_8192_key_bits;
bits = 8192;
}
ret = gnutls_dh_params_import_raw2(dh_params, &p, &g, key_bits);
if (ret < 0) {
fprintf(stderr, "Error exporting parameters: %s\n",
gnutls_strerror(ret));
exit(1);
}
#elif defined(ENABLE_SRP)
if (bits <= 1024) {
p = gnutls_srp_1024_group_prime;
g = gnutls_srp_1024_group_generator;
bits = 1024;
} else if (bits <= 1536) {
p = gnutls_srp_1536_group_prime;
g = gnutls_srp_1536_group_generator;
bits = 1536;
} else if (bits <= 2048) {
p = gnutls_srp_2048_group_prime;
g = gnutls_srp_2048_group_generator;
bits = 2048;
} else if (bits <= 3072) {
p = gnutls_srp_3072_group_prime;
g = gnutls_srp_3072_group_generator;
bits = 3072;
} else {
p = gnutls_srp_4096_group_prime;
g = gnutls_srp_4096_group_generator;
bits = 4096;
}
ret = gnutls_dh_params_import_raw(dh_params, &p, &g);
if (ret < 0) {
fprintf(stderr, "Error exporting parameters: %s\n",
gnutls_strerror(ret));
exit(1);
}
#else
fprintf(stderr,
"Parameters unavailable as SRP is disabled.\n");
exit(1);
#endif
}
if (info->outcert_format == GNUTLS_X509_FMT_PEM)
print_dh_info(outfile, &p, &g, q_bits, info->cprint);
if (!info->cprint) { /* generate a PKCS#3 structure */
size_t len = lbuffer_size;
ret =
gnutls_dh_params_export_pkcs3(dh_params,
info->outcert_format,
lbuffer, &len);
if (ret == 0) {
if (info->outcert_format == GNUTLS_X509_FMT_PEM)
fprintf(outfile, "\n%s", lbuffer);
else
fwrite(lbuffer, 1, len, outfile);
} else {
fprintf(stderr, "Error: %s\n",
gnutls_strerror(ret));
}
}
if (how != 0) {
gnutls_free(p.data);
gnutls_free(g.data);
}
gnutls_dh_params_deinit(dh_params);
return 0;
}
