2 * Copyright 2020 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
12 #include <openssl/objects.h>
13 #include <openssl/evp.h>
14 #include "internal/cryptlib.h"
15 #include "crypto/evp.h"
16 #include "internal/provider.h"
17 #include "evp_local.h"
19 static int evp_kem_init(EVP_PKEY_CTX *ctx, int operation)
23 EVP_KEYMGMT *tmp_keymgmt = NULL;
25 const char *supported_kem = NULL;
27 if (ctx == NULL || ctx->keytype == NULL) {
28 ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
32 evp_pkey_ctx_free_old_ops(ctx);
33 ctx->operation = operation;
36 * Ensure that the key is provided, either natively, or as a cached export.
38 tmp_keymgmt = ctx->keymgmt;
39 provkey = evp_pkey_export_to_provider(ctx->pkey, ctx->libctx,
40 &tmp_keymgmt, ctx->propquery);
42 || !EVP_KEYMGMT_up_ref(tmp_keymgmt)) {
43 ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
46 EVP_KEYMGMT_free(ctx->keymgmt);
47 ctx->keymgmt = tmp_keymgmt;
49 if (ctx->keymgmt->query_operation_name != NULL)
50 supported_kem = ctx->keymgmt->query_operation_name(OSSL_OP_KEM);
53 * If we didn't get a supported kem, assume there is one with the
54 * same name as the key type.
56 if (supported_kem == NULL)
57 supported_kem = ctx->keytype;
59 kem = EVP_KEM_fetch(ctx->libctx, supported_kem, ctx->propquery);
61 || (EVP_KEYMGMT_provider(ctx->keymgmt) != EVP_KEM_provider(kem))) {
62 ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
67 ctx->op.encap.kem = kem;
68 ctx->op.encap.kemprovctx = kem->newctx(ossl_provider_ctx(kem->prov));
69 if (ctx->op.encap.kemprovctx == NULL) {
70 /* The provider key can stay in the cache */
71 ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
76 case EVP_PKEY_OP_ENCAPSULATE:
77 if (kem->encapsulate_init == NULL) {
78 ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
82 ret = kem->encapsulate_init(ctx->op.encap.kemprovctx, provkey);
84 case EVP_PKEY_OP_DECAPSULATE:
85 if (kem->decapsulate_init == NULL) {
86 ERR_raise(ERR_LIB_EVP, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
90 ret = kem->decapsulate_init(ctx->op.encap.kemprovctx, provkey);
93 ERR_raise(ERR_LIB_EVP, EVP_R_INITIALIZATION_ERROR);
101 evp_pkey_ctx_free_old_ops(ctx);
102 ctx->operation = EVP_PKEY_OP_UNDEFINED;
107 int EVP_PKEY_encapsulate_init(EVP_PKEY_CTX *ctx)
109 return evp_kem_init(ctx, EVP_PKEY_OP_ENCAPSULATE);
112 int EVP_PKEY_encapsulate(EVP_PKEY_CTX *ctx,
113 unsigned char *out, size_t *outlen,
114 unsigned char *secret, size_t *secretlen)
119 if (ctx->operation != EVP_PKEY_OP_ENCAPSULATE) {
120 EVPerr(0, EVP_R_OPERATON_NOT_INITIALIZED);
124 if (ctx->op.encap.kemprovctx == NULL) {
125 EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
129 if (out != NULL && secret == NULL)
132 return ctx->op.encap.kem->encapsulate(ctx->op.encap.kemprovctx,
133 out, outlen, secret, secretlen);
136 int EVP_PKEY_decapsulate_init(EVP_PKEY_CTX *ctx)
138 return evp_kem_init(ctx, EVP_PKEY_OP_DECAPSULATE);
141 int EVP_PKEY_decapsulate(EVP_PKEY_CTX *ctx,
142 unsigned char *secret, size_t *secretlen,
143 const unsigned char *in, size_t inlen)
146 || (in == NULL || inlen == 0)
147 || (secret == NULL && secretlen == NULL))
150 if (ctx->operation != EVP_PKEY_OP_DECAPSULATE) {
151 EVPerr(0, EVP_R_OPERATON_NOT_INITIALIZED);
155 if (ctx->op.encap.kemprovctx == NULL) {
156 EVPerr(0, EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
159 return ctx->op.encap.kem->decapsulate(ctx->op.encap.kemprovctx,
160 secret, secretlen, in, inlen);
163 static EVP_KEM *evp_kem_new(OSSL_PROVIDER *prov)
165 EVP_KEM *kem = OPENSSL_zalloc(sizeof(EVP_KEM));
168 ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
172 kem->lock = CRYPTO_THREAD_lock_new();
173 if (kem->lock == NULL) {
174 ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
179 ossl_provider_up_ref(prov);
185 static void *evp_kem_from_dispatch(int name_id, const OSSL_DISPATCH *fns,
189 int ctxfncnt = 0, encfncnt = 0, decfncnt = 0;
190 int gparamfncnt = 0, sparamfncnt = 0;
192 if ((kem = evp_kem_new(prov)) == NULL) {
193 ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
197 kem->name_id = name_id;
199 for (; fns->function_id != 0; fns++) {
200 switch (fns->function_id) {
201 case OSSL_FUNC_KEM_NEWCTX:
202 if (kem->newctx != NULL)
204 kem->newctx = OSSL_FUNC_kem_newctx(fns);
207 case OSSL_FUNC_KEM_ENCAPSULATE_INIT:
208 if (kem->encapsulate_init != NULL)
210 kem->encapsulate_init = OSSL_FUNC_kem_encapsulate_init(fns);
213 case OSSL_FUNC_KEM_ENCAPSULATE:
214 if (kem->encapsulate != NULL)
216 kem->encapsulate = OSSL_FUNC_kem_encapsulate(fns);
219 case OSSL_FUNC_KEM_DECAPSULATE_INIT:
220 if (kem->decapsulate_init != NULL)
222 kem->decapsulate_init = OSSL_FUNC_kem_decapsulate_init(fns);
225 case OSSL_FUNC_KEM_DECAPSULATE:
226 if (kem->decapsulate != NULL)
228 kem->decapsulate = OSSL_FUNC_kem_decapsulate(fns);
231 case OSSL_FUNC_KEM_FREECTX:
232 if (kem->freectx != NULL)
234 kem->freectx = OSSL_FUNC_kem_freectx(fns);
237 case OSSL_FUNC_KEM_DUPCTX:
238 if (kem->dupctx != NULL)
240 kem->dupctx = OSSL_FUNC_kem_dupctx(fns);
242 case OSSL_FUNC_KEM_GET_CTX_PARAMS:
243 if (kem->get_ctx_params != NULL)
246 = OSSL_FUNC_kem_get_ctx_params(fns);
249 case OSSL_FUNC_KEM_GETTABLE_CTX_PARAMS:
250 if (kem->gettable_ctx_params != NULL)
252 kem->gettable_ctx_params
253 = OSSL_FUNC_kem_gettable_ctx_params(fns);
256 case OSSL_FUNC_KEM_SET_CTX_PARAMS:
257 if (kem->set_ctx_params != NULL)
260 = OSSL_FUNC_kem_set_ctx_params(fns);
263 case OSSL_FUNC_KEM_SETTABLE_CTX_PARAMS:
264 if (kem->settable_ctx_params != NULL)
266 kem->settable_ctx_params
267 = OSSL_FUNC_kem_settable_ctx_params(fns);
273 || (encfncnt != 0 && encfncnt != 2)
274 || (decfncnt != 0 && decfncnt != 2)
275 || (encfncnt != 2 && decfncnt != 2)
276 || (gparamfncnt != 0 && gparamfncnt != 2)
277 || (sparamfncnt != 0 && sparamfncnt != 2)) {
279 * In order to be a consistent set of functions we must have at least
280 * a set of context functions (newctx and freectx) as well as a pair of
281 * "kem" functions: (encapsulate_init, encapsulate) or
282 * (decapsulate_init, decapsulate). set_ctx_params and settable_ctx_params are
283 * optional, but if one of them is present then the other one must also
284 * be present. The same applies to get_ctx_params and
285 * gettable_ctx_params. The dupctx function is optional.
287 ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_PROVIDER_FUNCTIONS);
297 void EVP_KEM_free(EVP_KEM *kem)
302 CRYPTO_DOWN_REF(&kem->refcnt, &i, kem->lock);
305 ossl_provider_free(kem->prov);
306 CRYPTO_THREAD_lock_free(kem->lock);
311 int EVP_KEM_up_ref(EVP_KEM *kem)
315 CRYPTO_UP_REF(&kem->refcnt, &ref, kem->lock);
319 OSSL_PROVIDER *EVP_KEM_provider(const EVP_KEM *kem)
324 EVP_KEM *EVP_KEM_fetch(OPENSSL_CTX *ctx, const char *algorithm,
325 const char *properties)
327 return evp_generic_fetch(ctx, OSSL_OP_KEM, algorithm, properties,
328 evp_kem_from_dispatch,
329 (int (*)(void *))EVP_KEM_up_ref,
330 (void (*)(void *))EVP_KEM_free);
333 int EVP_KEM_is_a(const EVP_KEM *kem, const char *name)
335 return evp_is_a(kem->prov, kem->name_id, NULL, name);
338 int EVP_KEM_number(const EVP_KEM *kem)
343 void EVP_KEM_do_all_provided(OPENSSL_CTX *libctx,
344 void (*fn)(EVP_KEM *kem, void *arg),
347 evp_generic_do_all(libctx, OSSL_OP_KEM, (void (*)(void *, void *))fn, arg,
348 evp_kem_from_dispatch,
349 (void (*)(void *))EVP_KEM_free);
353 void EVP_KEM_names_do_all(const EVP_KEM *kem,
354 void (*fn)(const char *name, void *data),
357 if (kem->prov != NULL)
358 evp_names_do_all(kem->prov, kem->name_id, fn, data);