1 /*
2 * Copyright 2019-2021 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, kdf->lock);
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, kdf->lock);
38 if (ref > 0)
39 return;
40 OPENSSL_free(kdf->type_name);
41 ossl_provider_free(kdf->prov);
42 CRYPTO_THREAD_lock_free(kdf->lock);
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 || (kdf->lock = CRYPTO_THREAD_lock_new()) == NULL) {
52 OPENSSL_free(kdf);
53 return NULL;
54 }
55 kdf->refcnt = 1;
56 return kdf;
57 }
58
evp_kdf_from_algorithm(int name_id,const OSSL_ALGORITHM * algodef,OSSL_PROVIDER * prov)59 static void *evp_kdf_from_algorithm(int name_id,
60 const OSSL_ALGORITHM *algodef,
61 OSSL_PROVIDER *prov)
62 {
63 const OSSL_DISPATCH *fns = algodef->implementation;
64 EVP_KDF *kdf = NULL;
65 int fnkdfcnt = 0, fnctxcnt = 0;
66
67 if ((kdf = evp_kdf_new()) == NULL) {
68 ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
69 return NULL;
70 }
71 kdf->name_id = name_id;
72 if ((kdf->type_name = ossl_algorithm_get1_first_name(algodef)) == NULL) {
73 evp_kdf_free(kdf);
74 return NULL;
75 }
76 kdf->description = algodef->algorithm_description;
77
78 for (; fns->function_id != 0; fns++) {
79 switch (fns->function_id) {
80 case OSSL_FUNC_KDF_NEWCTX:
81 if (kdf->newctx != NULL)
82 break;
83 kdf->newctx = OSSL_FUNC_kdf_newctx(fns);
84 fnctxcnt++;
85 break;
86 case OSSL_FUNC_KDF_DUPCTX:
87 if (kdf->dupctx != NULL)
88 break;
89 kdf->dupctx = OSSL_FUNC_kdf_dupctx(fns);
90 break;
91 case OSSL_FUNC_KDF_FREECTX:
92 if (kdf->freectx != NULL)
93 break;
94 kdf->freectx = OSSL_FUNC_kdf_freectx(fns);
95 fnctxcnt++;
96 break;
97 case OSSL_FUNC_KDF_RESET:
98 if (kdf->reset != NULL)
99 break;
100 kdf->reset = OSSL_FUNC_kdf_reset(fns);
101 break;
102 case OSSL_FUNC_KDF_DERIVE:
103 if (kdf->derive != NULL)
104 break;
105 kdf->derive = OSSL_FUNC_kdf_derive(fns);
106 fnkdfcnt++;
107 break;
108 case OSSL_FUNC_KDF_GETTABLE_PARAMS:
109 if (kdf->gettable_params != NULL)
110 break;
111 kdf->gettable_params =
112 OSSL_FUNC_kdf_gettable_params(fns);
113 break;
114 case OSSL_FUNC_KDF_GETTABLE_CTX_PARAMS:
115 if (kdf->gettable_ctx_params != NULL)
116 break;
117 kdf->gettable_ctx_params =
118 OSSL_FUNC_kdf_gettable_ctx_params(fns);
119 break;
120 case OSSL_FUNC_KDF_SETTABLE_CTX_PARAMS:
121 if (kdf->settable_ctx_params != NULL)
122 break;
123 kdf->settable_ctx_params =
124 OSSL_FUNC_kdf_settable_ctx_params(fns);
125 break;
126 case OSSL_FUNC_KDF_GET_PARAMS:
127 if (kdf->get_params != NULL)
128 break;
129 kdf->get_params = OSSL_FUNC_kdf_get_params(fns);
130 break;
131 case OSSL_FUNC_KDF_GET_CTX_PARAMS:
132 if (kdf->get_ctx_params != NULL)
133 break;
134 kdf->get_ctx_params = OSSL_FUNC_kdf_get_ctx_params(fns);
135 break;
136 case OSSL_FUNC_KDF_SET_CTX_PARAMS:
137 if (kdf->set_ctx_params != NULL)
138 break;
139 kdf->set_ctx_params = OSSL_FUNC_kdf_set_ctx_params(fns);
140 break;
141 }
142 }
143 if (fnkdfcnt != 1 || fnctxcnt != 2) {
144 /*
145 * In order to be a consistent set of functions we must have at least
146 * a derive function, and a complete set of context management
147 * functions.
148 */
149 evp_kdf_free(kdf);
150 ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_PROVIDER_FUNCTIONS);
151 return NULL;
152 }
153 kdf->prov = prov;
154 if (prov != NULL)
155 ossl_provider_up_ref(prov);
156
157 return kdf;
158 }
159
EVP_KDF_fetch(OSSL_LIB_CTX * libctx,const char * algorithm,const char * properties)160 EVP_KDF *EVP_KDF_fetch(OSSL_LIB_CTX *libctx, const char *algorithm,
161 const char *properties)
162 {
163 return evp_generic_fetch(libctx, OSSL_OP_KDF, algorithm, properties,
164 evp_kdf_from_algorithm, evp_kdf_up_ref,
165 evp_kdf_free);
166 }
167
EVP_KDF_up_ref(EVP_KDF * kdf)168 int EVP_KDF_up_ref(EVP_KDF *kdf)
169 {
170 return evp_kdf_up_ref(kdf);
171 }
172
EVP_KDF_free(EVP_KDF * kdf)173 void EVP_KDF_free(EVP_KDF *kdf)
174 {
175 evp_kdf_free(kdf);
176 }
177
EVP_KDF_gettable_params(const EVP_KDF * kdf)178 const OSSL_PARAM *EVP_KDF_gettable_params(const EVP_KDF *kdf)
179 {
180 if (kdf->gettable_params == NULL)
181 return NULL;
182 return kdf->gettable_params(ossl_provider_ctx(EVP_KDF_get0_provider(kdf)));
183 }
184
EVP_KDF_gettable_ctx_params(const EVP_KDF * kdf)185 const OSSL_PARAM *EVP_KDF_gettable_ctx_params(const EVP_KDF *kdf)
186 {
187 void *alg;
188
189 if (kdf->gettable_ctx_params == NULL)
190 return NULL;
191 alg = ossl_provider_ctx(EVP_KDF_get0_provider(kdf));
192 return kdf->gettable_ctx_params(NULL, alg);
193 }
194
EVP_KDF_settable_ctx_params(const EVP_KDF * kdf)195 const OSSL_PARAM *EVP_KDF_settable_ctx_params(const EVP_KDF *kdf)
196 {
197 void *alg;
198
199 if (kdf->settable_ctx_params == NULL)
200 return NULL;
201 alg = ossl_provider_ctx(EVP_KDF_get0_provider(kdf));
202 return kdf->settable_ctx_params(NULL, alg);
203 }
204
EVP_KDF_CTX_gettable_params(EVP_KDF_CTX * ctx)205 const OSSL_PARAM *EVP_KDF_CTX_gettable_params(EVP_KDF_CTX *ctx)
206 {
207 void *alg;
208
209 if (ctx->meth->gettable_ctx_params == NULL)
210 return NULL;
211 alg = ossl_provider_ctx(EVP_KDF_get0_provider(ctx->meth));
212 return ctx->meth->gettable_ctx_params(ctx->algctx, alg);
213 }
214
EVP_KDF_CTX_settable_params(EVP_KDF_CTX * ctx)215 const OSSL_PARAM *EVP_KDF_CTX_settable_params(EVP_KDF_CTX *ctx)
216 {
217 void *alg;
218
219 if (ctx->meth->settable_ctx_params == NULL)
220 return NULL;
221 alg = ossl_provider_ctx(EVP_KDF_get0_provider(ctx->meth));
222 return ctx->meth->settable_ctx_params(ctx->algctx, alg);
223 }
224
EVP_KDF_do_all_provided(OSSL_LIB_CTX * libctx,void (* fn)(EVP_KDF * kdf,void * arg),void * arg)225 void EVP_KDF_do_all_provided(OSSL_LIB_CTX *libctx,
226 void (*fn)(EVP_KDF *kdf, void *arg),
227 void *arg)
228 {
229 evp_generic_do_all(libctx, OSSL_OP_KDF,
230 (void (*)(void *, void *))fn, arg,
231 evp_kdf_from_algorithm, evp_kdf_up_ref, evp_kdf_free);
232 }
233