1 /*
2 * Copyright 2019-2023 The OpenSSL Project Authors. All Rights Reserved.
3 *
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
8 */
9
10 #include <openssl/evp.h>
11 #include <openssl/err.h>
12 #include <openssl/core.h>
13 #include <openssl/core_dispatch.h>
14 #include <openssl/kdf.h>
15 #include "internal/provider.h"
16 #include "internal/core.h"
17 #include "crypto/evp.h"
18 #include "evp_local.h"
19
evp_kdf_up_ref(void * vkdf)20 static int evp_kdf_up_ref(void *vkdf)
21 {
22 EVP_KDF *kdf = (EVP_KDF *)vkdf;
23 int ref = 0;
24
25 CRYPTO_UP_REF(&kdf->refcnt, &ref);
26 return 1;
27 }
28
evp_kdf_free(void * vkdf)29 static void evp_kdf_free(void *vkdf)
30 {
31 EVP_KDF *kdf = (EVP_KDF *)vkdf;
32 int ref = 0;
33
34 if (kdf == NULL)
35 return;
36
37 CRYPTO_DOWN_REF(&kdf->refcnt, &ref);
38 if (ref > 0)
39 return;
40 OPENSSL_free(kdf->type_name);
41 ossl_provider_free(kdf->prov);
42 CRYPTO_FREE_REF(&kdf->refcnt);
43 OPENSSL_free(kdf);
44 }
45
evp_kdf_new(void)46 static void *evp_kdf_new(void)
47 {
48 EVP_KDF *kdf = NULL;
49
50 if ((kdf = OPENSSL_zalloc(sizeof(*kdf))) == NULL
51 || !CRYPTO_NEW_REF(&kdf->refcnt, 1)) {
52 OPENSSL_free(kdf);
53 return NULL;
54 }
55 return kdf;
56 }
57
evp_kdf_from_algorithm(int name_id,const OSSL_ALGORITHM * algodef,OSSL_PROVIDER * prov)58 static void *evp_kdf_from_algorithm(int name_id,
59 const OSSL_ALGORITHM *algodef,
60 OSSL_PROVIDER *prov)
61 {
62 const OSSL_DISPATCH *fns = algodef->implementation;
63 EVP_KDF *kdf = NULL;
64 int fnkdfcnt = 0, fnctxcnt = 0;
65
66 if ((kdf = evp_kdf_new()) == NULL) {
67 ERR_raise(ERR_LIB_EVP, ERR_R_EVP_LIB);
68 return NULL;
69 }
70 kdf->name_id = name_id;
71 if ((kdf->type_name = ossl_algorithm_get1_first_name(algodef)) == NULL) {
72 evp_kdf_free(kdf);
73 return NULL;
74 }
75 kdf->description = algodef->algorithm_description;
76
77 for (; fns->function_id != 0; fns++) {
78 switch (fns->function_id) {
79 case OSSL_FUNC_KDF_NEWCTX:
80 if (kdf->newctx != NULL)
81 break;
82 kdf->newctx = OSSL_FUNC_kdf_newctx(fns);
83 fnctxcnt++;
84 break;
85 case OSSL_FUNC_KDF_DUPCTX:
86 if (kdf->dupctx != NULL)
87 break;
88 kdf->dupctx = OSSL_FUNC_kdf_dupctx(fns);
89 break;
90 case OSSL_FUNC_KDF_FREECTX:
91 if (kdf->freectx != NULL)
92 break;
93 kdf->freectx = OSSL_FUNC_kdf_freectx(fns);
94 fnctxcnt++;
95 break;
96 case OSSL_FUNC_KDF_RESET:
97 if (kdf->reset != NULL)
98 break;
99 kdf->reset = OSSL_FUNC_kdf_reset(fns);
100 break;
101 case OSSL_FUNC_KDF_DERIVE:
102 if (kdf->derive != NULL)
103 break;
104 kdf->derive = OSSL_FUNC_kdf_derive(fns);
105 fnkdfcnt++;
106 break;
107 case OSSL_FUNC_KDF_GETTABLE_PARAMS:
108 if (kdf->gettable_params != NULL)
109 break;
110 kdf->gettable_params =
111 OSSL_FUNC_kdf_gettable_params(fns);
112 break;
113 case OSSL_FUNC_KDF_GETTABLE_CTX_PARAMS:
114 if (kdf->gettable_ctx_params != NULL)
115 break;
116 kdf->gettable_ctx_params =
117 OSSL_FUNC_kdf_gettable_ctx_params(fns);
118 break;
119 case OSSL_FUNC_KDF_SETTABLE_CTX_PARAMS:
120 if (kdf->settable_ctx_params != NULL)
121 break;
122 kdf->settable_ctx_params =
123 OSSL_FUNC_kdf_settable_ctx_params(fns);
124 break;
125 case OSSL_FUNC_KDF_GET_PARAMS:
126 if (kdf->get_params != NULL)
127 break;
128 kdf->get_params = OSSL_FUNC_kdf_get_params(fns);
129 break;
130 case OSSL_FUNC_KDF_GET_CTX_PARAMS:
131 if (kdf->get_ctx_params != NULL)
132 break;
133 kdf->get_ctx_params = OSSL_FUNC_kdf_get_ctx_params(fns);
134 break;
135 case OSSL_FUNC_KDF_SET_CTX_PARAMS:
136 if (kdf->set_ctx_params != NULL)
137 break;
138 kdf->set_ctx_params = OSSL_FUNC_kdf_set_ctx_params(fns);
139 break;
140 }
141 }
142 if (fnkdfcnt != 1 || fnctxcnt != 2) {
143 /*
144 * In order to be a consistent set of functions we must have at least
145 * a derive function, and a complete set of context management
146 * functions.
147 */
148 evp_kdf_free(kdf);
149 ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_PROVIDER_FUNCTIONS);
150 return NULL;
151 }
152 kdf->prov = prov;
153 if (prov != NULL)
154 ossl_provider_up_ref(prov);
155
156 return kdf;
157 }
158
EVP_KDF_fetch(OSSL_LIB_CTX * libctx,const char * algorithm,const char * properties)159 EVP_KDF *EVP_KDF_fetch(OSSL_LIB_CTX *libctx, const char *algorithm,
160 const char *properties)
161 {
162 return evp_generic_fetch(libctx, OSSL_OP_KDF, algorithm, properties,
163 evp_kdf_from_algorithm, evp_kdf_up_ref,
164 evp_kdf_free);
165 }
166
EVP_KDF_up_ref(EVP_KDF * kdf)167 int EVP_KDF_up_ref(EVP_KDF *kdf)
168 {
169 return evp_kdf_up_ref(kdf);
170 }
171
EVP_KDF_free(EVP_KDF * kdf)172 void EVP_KDF_free(EVP_KDF *kdf)
173 {
174 evp_kdf_free(kdf);
175 }
176
EVP_KDF_gettable_params(const EVP_KDF * kdf)177 const OSSL_PARAM *EVP_KDF_gettable_params(const EVP_KDF *kdf)
178 {
179 if (kdf->gettable_params == NULL)
180 return NULL;
181 return kdf->gettable_params(ossl_provider_ctx(EVP_KDF_get0_provider(kdf)));
182 }
183
EVP_KDF_gettable_ctx_params(const EVP_KDF * kdf)184 const OSSL_PARAM *EVP_KDF_gettable_ctx_params(const EVP_KDF *kdf)
185 {
186 void *alg;
187
188 if (kdf->gettable_ctx_params == NULL)
189 return NULL;
190 alg = ossl_provider_ctx(EVP_KDF_get0_provider(kdf));
191 return kdf->gettable_ctx_params(NULL, alg);
192 }
193
EVP_KDF_settable_ctx_params(const EVP_KDF * kdf)194 const OSSL_PARAM *EVP_KDF_settable_ctx_params(const EVP_KDF *kdf)
195 {
196 void *alg;
197
198 if (kdf->settable_ctx_params == NULL)
199 return NULL;
200 alg = ossl_provider_ctx(EVP_KDF_get0_provider(kdf));
201 return kdf->settable_ctx_params(NULL, alg);
202 }
203
EVP_KDF_CTX_gettable_params(EVP_KDF_CTX * ctx)204 const OSSL_PARAM *EVP_KDF_CTX_gettable_params(EVP_KDF_CTX *ctx)
205 {
206 void *alg;
207
208 if (ctx->meth->gettable_ctx_params == NULL)
209 return NULL;
210 alg = ossl_provider_ctx(EVP_KDF_get0_provider(ctx->meth));
211 return ctx->meth->gettable_ctx_params(ctx->algctx, alg);
212 }
213
EVP_KDF_CTX_settable_params(EVP_KDF_CTX * ctx)214 const OSSL_PARAM *EVP_KDF_CTX_settable_params(EVP_KDF_CTX *ctx)
215 {
216 void *alg;
217
218 if (ctx->meth->settable_ctx_params == NULL)
219 return NULL;
220 alg = ossl_provider_ctx(EVP_KDF_get0_provider(ctx->meth));
221 return ctx->meth->settable_ctx_params(ctx->algctx, alg);
222 }
223
EVP_KDF_do_all_provided(OSSL_LIB_CTX * libctx,void (* fn)(EVP_KDF * kdf,void * arg),void * arg)224 void EVP_KDF_do_all_provided(OSSL_LIB_CTX *libctx,
225 void (*fn)(EVP_KDF *kdf, void *arg),
226 void *arg)
227 {
228 evp_generic_do_all(libctx, OSSL_OP_KDF,
229 (void (*)(void *, void *))fn, arg,
230 evp_kdf_from_algorithm, evp_kdf_up_ref, evp_kdf_free);
231 }
232
