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/*
* Copyright 2020-2022 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
*/
#include "internal/ffc.h"
#include "internal/nelem.h"
#include "crypto/bn_dh.h"
#ifndef OPENSSL_NO_DH
# define FFDHE(sz, keylength) { \
SN_ffdhe##sz, NID_ffdhe##sz, \
sz, \
keylength, \
&ossl_bignum_ffdhe##sz##_p, &ossl_bignum_ffdhe##sz##_q, \
&ossl_bignum_const_2, \
}
# define MODP(sz, keylength) { \
SN_modp_##sz, NID_modp_##sz, \
sz, \
keylength, \
&ossl_bignum_modp_##sz##_p, &ossl_bignum_modp_##sz##_q, \
&ossl_bignum_const_2 \
}
# define RFC5114(name, uid, sz, tag) { \
name, uid, \
sz, \
0, \
&ossl_bignum_dh##tag##_p, &ossl_bignum_dh##tag##_q, \
&ossl_bignum_dh##tag##_g \
}
#else
# define FFDHE(sz, keylength) { SN_ffdhe##sz, NID_ffdhe##sz }
# define MODP(sz, keylength) { SN_modp_##sz, NID_modp_##sz }
# define RFC5114(name, uid, sz, tag) { name, uid }
#endif
struct dh_named_group_st {
const char *name;
int uid;
#ifndef OPENSSL_NO_DH
int32_t nbits;
int keylength;
const BIGNUM *p;
const BIGNUM *q;
const BIGNUM *g;
#endif
};
/*
* The private key length values are taken from RFC7919 with the values for
* MODP primes given the same lengths as the equivalent FFDHE.
* The MODP 1536 value is approximated.
*/
static const DH_NAMED_GROUP dh_named_groups[] = {
FFDHE(2048, 225),
FFDHE(3072, 275),
FFDHE(4096, 325),
FFDHE(6144, 375),
FFDHE(8192, 400),
#ifndef FIPS_MODULE
MODP(1536, 200),
#endif
MODP(2048, 225),
MODP(3072, 275),
MODP(4096, 325),
MODP(6144, 375),
MODP(8192, 400),
/*
* 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
};
const DH_NAMED_GROUP *ossl_ffc_name_to_dh_named_group(const char *name)
{
size_t i;
for (i = 0; i < OSSL_NELEM(dh_named_groups); ++i) {
if (OPENSSL_strcasecmp(dh_named_groups[i].name, name) == 0)
return &dh_named_groups[i];
}
return NULL;
}
const DH_NAMED_GROUP *ossl_ffc_uid_to_dh_named_group(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];
}
return NULL;
}
#ifndef OPENSSL_NO_DH
const DH_NAMED_GROUP *ossl_ffc_numbers_to_dh_named_group(const BIGNUM *p,
const BIGNUM *q,
const BIGNUM *g)
{
size_t i;
for (i = 0; i < OSSL_NELEM(dh_named_groups); ++i) {
/* Keep searching until a matching p and g is found */
if (BN_cmp(p, dh_named_groups[i].p) == 0
&& BN_cmp(g, dh_named_groups[i].g) == 0
/* Verify q is correct if it exists */
&& (q == NULL || BN_cmp(q, dh_named_groups[i].q) == 0))
return &dh_named_groups[i];
}
return NULL;
}
#endif
int ossl_ffc_named_group_get_uid(const DH_NAMED_GROUP *group)
{
if (group == NULL)
return NID_undef;
return group->uid;
}
const char *ossl_ffc_named_group_get_name(const DH_NAMED_GROUP *group)
{
if (group == NULL)
return NULL;
return group->name;
}
#ifndef OPENSSL_NO_DH
int ossl_ffc_named_group_get_keylength(const DH_NAMED_GROUP *group)
{
if (group == NULL)
return 0;
return group->keylength;
}
const BIGNUM *ossl_ffc_named_group_get_q(const DH_NAMED_GROUP *group)
{
if (group == NULL)
return NULL;
return group->q;
}
int ossl_ffc_named_group_set(FFC_PARAMS *ffc, const DH_NAMED_GROUP *group)
{
if (ffc == NULL || group == NULL)
return 0;
ossl_ffc_params_set0_pqg(ffc, (BIGNUM *)group->p, (BIGNUM *)group->q,
(BIGNUM *)group->g);
ffc->keylength = group->keylength;
/* flush the cached nid, The DH layer is responsible for caching */
ffc->nid = NID_undef;
return 1;
}
#endif
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