2 * Copyright 2019 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
10 #include <openssl/core_numbers.h>
11 #include <openssl/core_names.h>
12 #include <openssl/bn.h>
13 #include <openssl/dh.h>
14 #include <openssl/params.h>
15 #include "internal/provider_algs.h"
17 static OSSL_OP_keymgmt_importkey_fn dh_importkey;
19 static int params_to_key(DH *dh, const OSSL_PARAM params[])
21 const OSSL_PARAM *param_p, *param_g, *param_priv_key, *param_pub_key;
22 BIGNUM *p = NULL, *g = NULL, *priv_key = NULL, *pub_key = NULL;
27 param_p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_P);
28 param_g = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_FFC_G);
30 OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_DH_PRIV_KEY);
32 OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_DH_PUB_KEY);
35 * DH documentation says that a public key must be present if a
36 * private key is present.
37 * We want to have at least a public key either way, so we end up
38 * requiring it unconditionally.
40 if (param_pub_key == NULL)
43 if ((param_p != NULL && !OSSL_PARAM_get_BN(param_p, &p))
44 || (param_g != NULL && !OSSL_PARAM_get_BN(param_g, &g))
45 || (param_priv_key != NULL
46 && !OSSL_PARAM_get_BN(param_priv_key, &priv_key))
47 || !OSSL_PARAM_get_BN(param_pub_key, &pub_key))
50 if (!DH_set0_pqg(dh, p, NULL, g))
54 if (!DH_set0_key(dh, pub_key, priv_key))
56 priv_key = pub_key = NULL;
68 static void *dh_importkey(void *provctx, const OSSL_PARAM params[])
72 if ((dh = DH_new()) == NULL
73 || !params_to_key(dh, params)) {
80 const OSSL_DISPATCH dh_keymgmt_functions[] = {
82 * TODO(3.0) When implementing OSSL_FUNC_KEYMGMT_GENKEY, remember to also
83 * implement OSSL_FUNC_KEYMGMT_EXPORTKEY.
85 { OSSL_FUNC_KEYMGMT_IMPORTKEY, (void (*)(void))dh_importkey },
86 { OSSL_FUNC_KEYMGMT_FREEKEY, (void (*)(void))DH_free },