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/crypto.h>
11 #include <openssl/core_numbers.h>
12 #include <openssl/core_names.h>
13 #include <openssl/dh.h>
14 #include <openssl/params.h>
15 #include "internal/provider_algs.h"
17 static OSSL_OP_keyexch_newctx_fn dh_newctx;
18 static OSSL_OP_keyexch_init_fn dh_init;
19 static OSSL_OP_keyexch_set_peer_fn dh_set_peer;
20 static OSSL_OP_keyexch_derive_fn dh_derive;
21 static OSSL_OP_keyexch_freectx_fn dh_freectx;
22 static OSSL_OP_keyexch_dupctx_fn dh_dupctx;
25 * What's passed as an actual key is defined by the KEYMGMT interface.
26 * We happen to know that our KEYMGMT simply passes DH structures, so
27 * we use that here too.
36 static void *dh_newctx(void *provctx)
38 return OPENSSL_zalloc(sizeof(PROV_DH_CTX));
41 static int dh_init(void *vpdhctx, void *vdh)
43 PROV_DH_CTX *pdhctx = (PROV_DH_CTX *)vpdhctx;
45 if (pdhctx == NULL || vdh == NULL || !DH_up_ref(vdh))
52 static int dh_set_peer(void *vpdhctx, void *vdh)
54 PROV_DH_CTX *pdhctx = (PROV_DH_CTX *)vpdhctx;
56 if (pdhctx == NULL || vdh == NULL || !DH_up_ref(vdh))
58 DH_free(pdhctx->dhpeer);
63 static int dh_derive(void *vpdhctx, unsigned char *secret, size_t *secretlen,
66 PROV_DH_CTX *pdhctx = (PROV_DH_CTX *)vpdhctx;
69 const BIGNUM *pub_key = NULL;
71 /* TODO(3.0): Add errors to stack */
72 if (pdhctx->dh == NULL || pdhctx->dhpeer == NULL)
75 dhsize = (size_t)DH_size(pdhctx->dh);
83 DH_get0_key(pdhctx->dhpeer, &pub_key, NULL);
84 ret = (pdhctx->pad) ? DH_compute_key_padded(secret, pub_key, pdhctx->dh)
85 : DH_compute_key(secret, pub_key, pdhctx->dh);
93 static void dh_freectx(void *vpdhctx)
95 PROV_DH_CTX *pdhctx = (PROV_DH_CTX *)vpdhctx;
98 DH_free(pdhctx->dhpeer);
100 OPENSSL_free(pdhctx);
103 static void *dh_dupctx(void *vpdhctx)
105 PROV_DH_CTX *srcctx = (PROV_DH_CTX *)vpdhctx;
108 dstctx = OPENSSL_zalloc(sizeof(*srcctx));
113 if (dstctx->dh != NULL && !DH_up_ref(dstctx->dh)) {
114 OPENSSL_free(dstctx);
118 if (dstctx->dhpeer != NULL && !DH_up_ref(dstctx->dhpeer)) {
120 OPENSSL_free(dstctx);
127 static int dh_set_params(void *vpdhctx, const OSSL_PARAM params[])
129 PROV_DH_CTX *pdhctx = (PROV_DH_CTX *)vpdhctx;
133 if (pdhctx == NULL || params == NULL)
136 p = OSSL_PARAM_locate_const(params, OSSL_EXCHANGE_PARAM_PAD);
137 if (p == NULL || !OSSL_PARAM_get_uint(p, &pad))
139 pdhctx->pad = pad ? 1 : 0;
143 const OSSL_DISPATCH dh_keyexch_functions[] = {
144 { OSSL_FUNC_KEYEXCH_NEWCTX, (void (*)(void))dh_newctx },
145 { OSSL_FUNC_KEYEXCH_INIT, (void (*)(void))dh_init },
146 { OSSL_FUNC_KEYEXCH_DERIVE, (void (*)(void))dh_derive },
147 { OSSL_FUNC_KEYEXCH_SET_PEER, (void (*)(void))dh_set_peer },
148 { OSSL_FUNC_KEYEXCH_FREECTX, (void (*)(void))dh_freectx },
149 { OSSL_FUNC_KEYEXCH_DUPCTX, (void (*)(void))dh_dupctx },
150 { OSSL_FUNC_KEYEXCH_SET_PARAMS, (void (*)(void))dh_set_params },