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/*
* Copyright 2017-2020 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
/* DH parameters from RFC7919 and RFC3526 */
/*
* DH low level APIs are deprecated for public use, but still ok for
* internal use.
*/
#include "internal/deprecated.h"
#include <stdio.h>
#include "internal/cryptlib.h"
#include "internal/ffc.h"
#include "dh_local.h"
#include <openssl/bn.h>
#include <openssl/objects.h>
#include "crypto/bn_dh.h"
#include "crypto/dh.h"
#include "e_os.h" /* strcasecmp */
#define FFDHE(sz) { \
SN_ffdhe##sz, NID_ffdhe##sz, \
sz, \
&_bignum_ffdhe##sz##_p, &_bignum_ffdhe##sz##_q, &_bignum_const_2 \
}
#define MODP(sz) { \
SN_modp_##sz, NID_modp_##sz, \
sz, \
&_bignum_modp_##sz##_p, &_bignum_modp_##sz##_q, &_bignum_const_2 \
}
#define RFC5114(name, uid, sz, tag) { \
name, uid, \
sz, \
&_bignum_dh##tag##_p, &_bignum_dh##tag##_q, &_bignum_dh##tag##_g \
}
typedef struct dh_named_group_st {
const char *name;
int uid;
int32_t nbits;
const BIGNUM *p;
const BIGNUM *q;
const BIGNUM *g;
} DH_NAMED_GROUP;
static const DH_NAMED_GROUP dh_named_groups[] = {
FFDHE(2048),
FFDHE(3072),
FFDHE(4096),
FFDHE(6144),
FFDHE(8192),
#ifndef FIPS_MODULE
MODP(1536),
#endif
MODP(2048),
MODP(3072),
MODP(4096),
MODP(6144),
MODP(8192),
/*
* Additional dh named groups from RFC 5114 that have a different g.
* The uid can be any unique identifier.
*/
#ifndef FIPS_MODULE
RFC5114("dh_1024_160", 1, 1024, 1024_160),
RFC5114("dh_2048_224", 2, 2048, 2048_224),
RFC5114("dh_2048_256", 3, 2048, 2048_256),
#endif
};
int ossl_ffc_named_group_to_uid(const char *name)
{
size_t i;
for (i = 0; i < OSSL_NELEM(dh_named_groups); ++i) {
if (strcasecmp(dh_named_groups[i].name, name) == 0)
return dh_named_groups[i].uid;
}
return NID_undef;
}
const char *ossl_ffc_named_group_from_uid(int uid)
{
size_t i;
for (i = 0; i < OSSL_NELEM(dh_named_groups); ++i) {
if (dh_named_groups[i].uid == uid)
return dh_named_groups[i].name;
}
return NULL;
}
static DH *dh_param_init(OSSL_LIB_CTX *libctx, int uid, const BIGNUM *p,
const BIGNUM *q, const BIGNUM *g)
{
DH *dh = dh_new_ex(libctx);
if (dh == NULL)
return NULL;
dh->params.nid = uid;
dh->params.p = (BIGNUM *)p;
dh->params.q = (BIGNUM *)q;
dh->params.g = (BIGNUM *)g;
dh->length = BN_num_bits(q);
dh->dirty_cnt++;
return dh;
}
static DH *dh_new_by_group_name(OSSL_LIB_CTX *libctx, const char *name)
{
int i;
if (name == NULL)
return NULL;
for (i = 0; i < (int)OSSL_NELEM(dh_named_groups); ++i) {
if (strcasecmp(dh_named_groups[i].name, name) == 0) {
return dh_param_init(libctx, dh_named_groups[i].uid,
dh_named_groups[i].p,
dh_named_groups[i].q,
dh_named_groups[i].g);
}
}
DHerr(0, DH_R_INVALID_PARAMETER_NID);
return NULL;
}
DH *dh_new_by_nid_ex(OSSL_LIB_CTX *libctx, int nid)
{
const char *name = ossl_ffc_named_group_from_uid(nid);
return dh_new_by_group_name(libctx, name);
}
DH *DH_new_by_nid(int nid)
{
return dh_new_by_nid_ex(NULL, nid);
}
int ossl_ffc_set_group_pqg(FFC_PARAMS *ffc, const char *group_name)
{
int i;
BIGNUM *q = NULL;
if (ffc == NULL)
return 0;
for (i = 0; i < (int)OSSL_NELEM(dh_named_groups); ++i) {
if (strcasecmp(dh_named_groups[i].name, group_name) == 0) {
ossl_ffc_params_set0_pqg(ffc,
(BIGNUM *)dh_named_groups[i].p,
(BIGNUM *)dh_named_groups[i].q,
(BIGNUM *)dh_named_groups[i].g);
/* flush the cached nid, The DH layer is responsible for caching */
ffc->nid = NID_undef;
return 1;
}
}
/* gets here on error or if the name was not found */
BN_free(q);
return 0;
}
void dh_cache_named_group(DH *dh)
{
int i;
if (dh == NULL)
return;
dh->params.nid = NID_undef; /* flush cached value */
/* Exit if p or g is not set */
if (dh->params.p == NULL
|| dh->params.g == NULL)
return;
for (i = 0; i < (int)OSSL_NELEM(dh_named_groups); ++i) {
/* Keep searching until a matching p and g is found */
if (BN_cmp(dh->params.p, dh_named_groups[i].p) == 0
&& BN_cmp(dh->params.g, dh_named_groups[i].g) == 0) {
/* Verify q is correct if it exists */
if (dh->params.q != NULL) {
if (BN_cmp(dh->params.q, dh_named_groups[i].q) != 0)
continue; /* ignore if q does not match */
} else {
dh->params.q = (BIGNUM *)dh_named_groups[i].q;
}
dh->params.nid = dh_named_groups[i].uid; /* cache the nid */
dh->length = BN_num_bits(dh->params.q);
dh->dirty_cnt++;
break;
}
}
}
int DH_get_nid(const DH *dh)
{
if (dh == NULL)
return NID_undef;
return dh->params.nid;
}
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