2 * Copyright 2020-2023 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_dispatch.h>
12 #include <openssl/core_names.h>
13 #include <openssl/params.h>
14 #include <openssl/err.h>
15 #include <openssl/proverr.h>
16 #include "internal/cryptlib.h"
17 #include "crypto/ecx.h"
18 #include "prov/implementations.h"
19 #include "prov/providercommon.h"
21 static OSSL_FUNC_keyexch_newctx_fn x25519_newctx;
22 static OSSL_FUNC_keyexch_newctx_fn x448_newctx;
23 static OSSL_FUNC_keyexch_init_fn ecx_init;
24 static OSSL_FUNC_keyexch_set_peer_fn ecx_set_peer;
25 static OSSL_FUNC_keyexch_derive_fn ecx_derive;
26 static OSSL_FUNC_keyexch_freectx_fn ecx_freectx;
27 static OSSL_FUNC_keyexch_dupctx_fn ecx_dupctx;
30 * What's passed as an actual key is defined by the KEYMGMT interface.
31 * We happen to know that our KEYMGMT simply passes ECX_KEY structures, so
32 * we use that here too.
41 static void *ecx_newctx(void *provctx, size_t keylen)
45 if (!ossl_prov_is_running())
48 ctx = OPENSSL_zalloc(sizeof(PROV_ECX_CTX));
57 static void *x25519_newctx(void *provctx)
59 return ecx_newctx(provctx, X25519_KEYLEN);
62 static void *x448_newctx(void *provctx)
64 return ecx_newctx(provctx, X448_KEYLEN);
67 static int ecx_init(void *vecxctx, void *vkey,
68 ossl_unused const OSSL_PARAM params[])
70 PROV_ECX_CTX *ecxctx = (PROV_ECX_CTX *)vecxctx;
73 if (!ossl_prov_is_running())
78 || key->keylen != ecxctx->keylen
79 || !ossl_ecx_key_up_ref(key)) {
80 ERR_raise(ERR_LIB_PROV, ERR_R_INTERNAL_ERROR);
84 ossl_ecx_key_free(ecxctx->key);
90 static int ecx_set_peer(void *vecxctx, void *vkey)
92 PROV_ECX_CTX *ecxctx = (PROV_ECX_CTX *)vecxctx;
95 if (!ossl_prov_is_running())
100 || key->keylen != ecxctx->keylen
101 || !ossl_ecx_key_up_ref(key)) {
102 ERR_raise(ERR_LIB_PROV, ERR_R_INTERNAL_ERROR);
105 ossl_ecx_key_free(ecxctx->peerkey);
106 ecxctx->peerkey = key;
111 static int ecx_derive(void *vecxctx, unsigned char *secret, size_t *secretlen,
114 PROV_ECX_CTX *ecxctx = (PROV_ECX_CTX *)vecxctx;
116 if (!ossl_prov_is_running())
118 return ossl_ecx_compute_key(ecxctx->peerkey, ecxctx->key, ecxctx->keylen,
119 secret, secretlen, outlen);
122 static void ecx_freectx(void *vecxctx)
124 PROV_ECX_CTX *ecxctx = (PROV_ECX_CTX *)vecxctx;
126 ossl_ecx_key_free(ecxctx->key);
127 ossl_ecx_key_free(ecxctx->peerkey);
129 OPENSSL_free(ecxctx);
132 static void *ecx_dupctx(void *vecxctx)
134 PROV_ECX_CTX *srcctx = (PROV_ECX_CTX *)vecxctx;
135 PROV_ECX_CTX *dstctx;
137 if (!ossl_prov_is_running())
140 dstctx = OPENSSL_zalloc(sizeof(*srcctx));
145 if (dstctx->key != NULL && !ossl_ecx_key_up_ref(dstctx->key)) {
146 ERR_raise(ERR_LIB_PROV, ERR_R_INTERNAL_ERROR);
147 OPENSSL_free(dstctx);
151 if (dstctx->peerkey != NULL && !ossl_ecx_key_up_ref(dstctx->peerkey)) {
152 ERR_raise(ERR_LIB_PROV, ERR_R_INTERNAL_ERROR);
153 ossl_ecx_key_free(dstctx->key);
154 OPENSSL_free(dstctx);
161 const OSSL_DISPATCH ossl_x25519_keyexch_functions[] = {
162 { OSSL_FUNC_KEYEXCH_NEWCTX, (void (*)(void))x25519_newctx },
163 { OSSL_FUNC_KEYEXCH_INIT, (void (*)(void))ecx_init },
164 { OSSL_FUNC_KEYEXCH_DERIVE, (void (*)(void))ecx_derive },
165 { OSSL_FUNC_KEYEXCH_SET_PEER, (void (*)(void))ecx_set_peer },
166 { OSSL_FUNC_KEYEXCH_FREECTX, (void (*)(void))ecx_freectx },
167 { OSSL_FUNC_KEYEXCH_DUPCTX, (void (*)(void))ecx_dupctx },
171 const OSSL_DISPATCH ossl_x448_keyexch_functions[] = {
172 { OSSL_FUNC_KEYEXCH_NEWCTX, (void (*)(void))x448_newctx },
173 { OSSL_FUNC_KEYEXCH_INIT, (void (*)(void))ecx_init },
174 { OSSL_FUNC_KEYEXCH_DERIVE, (void (*)(void))ecx_derive },
175 { OSSL_FUNC_KEYEXCH_SET_PEER, (void (*)(void))ecx_set_peer },
176 { OSSL_FUNC_KEYEXCH_FREECTX, (void (*)(void))ecx_freectx },
177 { OSSL_FUNC_KEYEXCH_DUPCTX, (void (*)(void))ecx_dupctx },