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/*
* Copyright 2019 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 low level APIs are deprecated for public use, but still ok for
* internal use.
*/
#include "internal/deprecated.h"
#include <openssl/core_numbers.h>
#include <openssl/core_names.h>
#include <openssl/bn.h>
#include <openssl/dh.h>
#include <openssl/params.h>
#include <openssl/param_build.h>
#include "prov/implementations.h"
#include "prov/providercommon.h"
#include "prov/provider_ctx.h"
#include "crypto/dh.h"
static OSSL_OP_keymgmt_new_fn dh_newdata;
static OSSL_OP_keymgmt_free_fn dh_freedata;
static OSSL_OP_keymgmt_get_params_fn dh_get_params;
static OSSL_OP_keymgmt_gettable_params_fn dh_gettable_params;
static OSSL_OP_keymgmt_has_fn dh_has;
static OSSL_OP_keymgmt_match_fn dh_match;
static OSSL_OP_keymgmt_validate_fn dh_validate;
static OSSL_OP_keymgmt_import_fn dh_import;
static OSSL_OP_keymgmt_import_types_fn dh_import_types;
static OSSL_OP_keymgmt_export_fn dh_export;
static OSSL_OP_keymgmt_export_types_fn dh_export_types;
#define DH_POSSIBLE_SELECTIONS \
(OSSL_KEYMGMT_SELECT_KEYPAIR | OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS)
static int domparams_to_params(DH *dh, OSSL_PARAM_BLD *tmpl)
{
const BIGNUM *dh_p = NULL, *dh_g = NULL;
if (dh == NULL)
return 0;
DH_get0_pqg(dh, &dh_p, NULL, &dh_g);
if (dh_p != NULL
&& !OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_P, dh_p))
return 0;
if (dh_g != NULL
&& !OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_G, dh_g))
return 0;
return 1;
}
static int key_to_params(DH *dh, OSSL_PARAM_BLD *tmpl)
{
const BIGNUM *priv_key = NULL, *pub_key = NULL;
if (dh == NULL)
return 0;
if (!domparams_to_params(dh, tmpl))
return 0;
DH_get0_key(dh, &pub_key, &priv_key);
if (priv_key != NULL
&& !OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_PRIV_KEY, priv_key))
return 0;
if (pub_key != NULL
&& !OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_PUB_KEY, pub_key))
return 0;
return 1;
}
static void *dh_newdata(void *provctx)
{
return dh_new_with_ctx(PROV_LIBRARY_CONTEXT_OF(provctx));
}
static void dh_freedata(void *keydata)
{
DH_free(keydata);
}
static int dh_has(void *keydata, int selection)
{
DH *dh = keydata;
int ok = 0;
if (dh != NULL) {
if ((selection & DH_POSSIBLE_SELECTIONS) != 0)
ok = 1;
if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0)
ok = ok && (DH_get0_pub_key(dh) != NULL);
if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0)
ok = ok && (DH_get0_priv_key(dh) != NULL);
if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0)
ok = ok && (DH_get0_p(dh) != NULL && DH_get0_g(dh) != NULL);
}
return ok;
}
static int dh_match(const void *keydata1, const void *keydata2, int selection)
{
const DH *dh1 = keydata1;
const DH *dh2 = keydata2;
int ok = 1;
if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0)
ok = ok && BN_cmp(DH_get0_pub_key(dh1), DH_get0_pub_key(dh2)) == 0;
if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0)
ok = ok && BN_cmp(DH_get0_priv_key(dh1), DH_get0_priv_key(dh2)) == 0;
if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0) {
FFC_PARAMS *dhparams1 = dh_get0_params((DH *)dh1);
FFC_PARAMS *dhparams2 = dh_get0_params((DH *)dh2);
ok = ok && ffc_params_cmp(dhparams1, dhparams2, 1);
}
return ok;
}
static int dh_import(void *keydata, int selection, const OSSL_PARAM params[])
{
DH *dh = keydata;
int ok = 0;
if (dh == NULL)
return 0;
if ((selection & DH_POSSIBLE_SELECTIONS) != 0)
ok = 1;
if ((selection & OSSL_KEYMGMT_SELECT_ALL_PARAMETERS) != 0)
ok = ok && ffc_params_fromdata(dh_get0_params(dh), params);
if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0)
ok = ok && dh_key_fromdata(dh, params);
return ok;
}
static int dh_export(void *keydata, int selection, OSSL_CALLBACK *param_cb,
void *cbarg)
{
DH *dh = keydata;
OSSL_PARAM_BLD *tmpl = NULL;
OSSL_PARAM *params = NULL;
int ok = 1;
if (dh == NULL)
return 0;
tmpl = OSSL_PARAM_BLD_new();
if (tmpl == NULL)
return 0;
if ((selection & OSSL_KEYMGMT_SELECT_ALL_PARAMETERS) != 0)
ok = ok && domparams_to_params(dh, tmpl);
if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0)
ok = ok && key_to_params(dh, tmpl);
if (!ok
|| (params = OSSL_PARAM_BLD_to_param(tmpl)) == NULL) {
ok = 0;
goto err;
}
ok = param_cb(params, cbarg);
OSSL_PARAM_BLD_free_params(params);
err:
OSSL_PARAM_BLD_free(tmpl);
return ok;
}
/* IMEXPORT = IMPORT + EXPORT */
# define DH_IMEXPORTABLE_PARAMETERS \
OSSL_PARAM_BN(OSSL_PKEY_PARAM_FFC_P, NULL, 0), \
OSSL_PARAM_BN(OSSL_PKEY_PARAM_FFC_G, NULL, 0)
# define DH_IMEXPORTABLE_PUBLIC_KEY \
OSSL_PARAM_BN(OSSL_PKEY_PARAM_PUB_KEY, NULL, 0)
# define DH_IMEXPORTABLE_PRIVATE_KEY \
OSSL_PARAM_BN(OSSL_PKEY_PARAM_PRIV_KEY, NULL, 0)
static const OSSL_PARAM dh_all_types[] = {
DH_IMEXPORTABLE_PARAMETERS,
DH_IMEXPORTABLE_PUBLIC_KEY,
DH_IMEXPORTABLE_PRIVATE_KEY,
OSSL_PARAM_END
};
static const OSSL_PARAM dh_parameter_types[] = {
DH_IMEXPORTABLE_PARAMETERS,
OSSL_PARAM_END
};
static const OSSL_PARAM dh_key_types[] = {
DH_IMEXPORTABLE_PUBLIC_KEY,
DH_IMEXPORTABLE_PRIVATE_KEY,
OSSL_PARAM_END
};
static const OSSL_PARAM *dh_types[] = {
NULL, /* Index 0 = none of them */
dh_parameter_types, /* Index 1 = parameter types */
dh_key_types, /* Index 2 = key types */
dh_all_types /* Index 3 = 1 + 2 */
};
static const OSSL_PARAM *dh_imexport_types(int selection)
{
int type_select = 0;
if ((selection & OSSL_KEYMGMT_SELECT_ALL_PARAMETERS) != 0)
type_select += 1;
if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR) != 0)
type_select += 2;
return dh_types[type_select];
}
static const OSSL_PARAM *dh_import_types(int selection)
{
return dh_imexport_types(selection);
}
static const OSSL_PARAM *dh_export_types(int selection)
{
return dh_imexport_types(selection);
}
static ossl_inline int dh_get_params(void *key, OSSL_PARAM params[])
{
DH *dh = key;
OSSL_PARAM *p;
if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_BITS)) != NULL
&& !OSSL_PARAM_set_int(p, DH_bits(dh)))
return 0;
if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_SECURITY_BITS)) != NULL
&& !OSSL_PARAM_set_int(p, DH_security_bits(dh)))
return 0;
if ((p = OSSL_PARAM_locate(params, OSSL_PKEY_PARAM_MAX_SIZE)) != NULL
&& !OSSL_PARAM_set_int(p, DH_size(dh)))
return 0;
return 1;
}
static const OSSL_PARAM dh_params[] = {
OSSL_PARAM_int(OSSL_PKEY_PARAM_BITS, NULL),
OSSL_PARAM_int(OSSL_PKEY_PARAM_SECURITY_BITS, NULL),
OSSL_PARAM_int(OSSL_PKEY_PARAM_MAX_SIZE, NULL),
OSSL_PARAM_END
};
static const OSSL_PARAM *dh_gettable_params(void)
{
return dh_params;
}
static int dh_validate_public(DH *dh)
{
const BIGNUM *pub_key = NULL;
DH_get0_key(dh, &pub_key, NULL);
return DH_check_pub_key_ex(dh, pub_key);
}
static int dh_validate_private(DH *dh)
{
int status = 0;
const BIGNUM *priv_key = NULL;
DH_get0_key(dh, NULL, &priv_key);
return dh_check_priv_key(dh, priv_key, &status);;
}
static int dh_validate(void *keydata, int selection)
{
DH *dh = keydata;
int ok = 0;
if ((selection & DH_POSSIBLE_SELECTIONS) != 0)
ok = 1;
if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0)
ok = ok && DH_check_params_ex(dh);
if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0)
ok = ok && dh_validate_public(dh);
if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0)
ok = ok && dh_validate_private(dh);
if ((selection & OSSL_KEYMGMT_SELECT_KEYPAIR)
== OSSL_KEYMGMT_SELECT_KEYPAIR)
ok = ok && dh_check_pairwise(dh);
return ok;
}
const OSSL_DISPATCH dh_keymgmt_functions[] = {
{ OSSL_FUNC_KEYMGMT_NEW, (void (*)(void))dh_newdata },
{ OSSL_FUNC_KEYMGMT_FREE, (void (*)(void))dh_freedata },
{ OSSL_FUNC_KEYMGMT_GET_PARAMS, (void (*) (void))dh_get_params },
{ OSSL_FUNC_KEYMGMT_GETTABLE_PARAMS, (void (*) (void))dh_gettable_params },
{ OSSL_FUNC_KEYMGMT_HAS, (void (*)(void))dh_has },
{ OSSL_FUNC_KEYMGMT_MATCH, (void (*)(void))dh_match },
{ OSSL_FUNC_KEYMGMT_VALIDATE, (void (*)(void))dh_validate },
{ OSSL_FUNC_KEYMGMT_IMPORT, (void (*)(void))dh_import },
{ OSSL_FUNC_KEYMGMT_IMPORT_TYPES, (void (*)(void))dh_import_types },
{ OSSL_FUNC_KEYMGMT_EXPORT, (void (*)(void))dh_export },
{ OSSL_FUNC_KEYMGMT_EXPORT_TYPES, (void (*)(void))dh_export_types },
{ 0, NULL }
};
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