1 /*
2 * Copyright 2018-2021 The OpenSSL Project Authors. All Rights Reserved.
3 * Copyright (c) 2018-2019, Oracle and/or its affiliates. All rights reserved.
4 *
5 * Licensed under the Apache License 2.0 (the "License"). You may not use
6 * this file except in compliance with the License. You can obtain a copy
7 * in the file LICENSE in the source distribution or at
8 * https://www.openssl.org/source/license.html
9 */
10
11 #include <stdio.h>
12 #include <stdlib.h>
13 #include "internal/cryptlib.h"
14 #include <openssl/evp.h>
15 #include <openssl/kdf.h>
16 #include <openssl/core.h>
17 #include <openssl/core_names.h>
18 #include "crypto/evp.h"
19 #include "internal/numbers.h"
20 #include "internal/provider.h"
21 #include "evp_local.h"
22
EVP_KDF_CTX_new(EVP_KDF * kdf)23 EVP_KDF_CTX *EVP_KDF_CTX_new(EVP_KDF *kdf)
24 {
25 EVP_KDF_CTX *ctx = NULL;
26
27 if (kdf == NULL)
28 return NULL;
29
30 ctx = OPENSSL_zalloc(sizeof(EVP_KDF_CTX));
31 if (ctx == NULL
32 || (ctx->algctx = kdf->newctx(ossl_provider_ctx(kdf->prov))) == NULL
33 || !EVP_KDF_up_ref(kdf)) {
34 ERR_raise(ERR_LIB_EVP, ERR_R_EVP_LIB);
35 if (ctx != NULL)
36 kdf->freectx(ctx->algctx);
37 OPENSSL_free(ctx);
38 ctx = NULL;
39 } else {
40 ctx->meth = kdf;
41 }
42 return ctx;
43 }
44
EVP_KDF_CTX_free(EVP_KDF_CTX * ctx)45 void EVP_KDF_CTX_free(EVP_KDF_CTX *ctx)
46 {
47 if (ctx == NULL)
48 return;
49 ctx->meth->freectx(ctx->algctx);
50 ctx->algctx = NULL;
51 EVP_KDF_free(ctx->meth);
52 OPENSSL_free(ctx);
53 }
54
EVP_KDF_CTX_dup(const EVP_KDF_CTX * src)55 EVP_KDF_CTX *EVP_KDF_CTX_dup(const EVP_KDF_CTX *src)
56 {
57 EVP_KDF_CTX *dst;
58
59 if (src == NULL || src->algctx == NULL || src->meth->dupctx == NULL)
60 return NULL;
61
62 dst = OPENSSL_malloc(sizeof(*dst));
63 if (dst == NULL)
64 return NULL;
65
66 memcpy(dst, src, sizeof(*dst));
67 if (!EVP_KDF_up_ref(dst->meth)) {
68 ERR_raise(ERR_LIB_EVP, ERR_R_EVP_LIB);
69 OPENSSL_free(dst);
70 return NULL;
71 }
72
73 dst->algctx = src->meth->dupctx(src->algctx);
74 if (dst->algctx == NULL) {
75 EVP_KDF_CTX_free(dst);
76 return NULL;
77 }
78 return dst;
79 }
80
evp_kdf_get_number(const EVP_KDF * kdf)81 int evp_kdf_get_number(const EVP_KDF *kdf)
82 {
83 return kdf->name_id;
84 }
85
EVP_KDF_get0_name(const EVP_KDF * kdf)86 const char *EVP_KDF_get0_name(const EVP_KDF *kdf)
87 {
88 return kdf->type_name;
89 }
90
EVP_KDF_get0_description(const EVP_KDF * kdf)91 const char *EVP_KDF_get0_description(const EVP_KDF *kdf)
92 {
93 return kdf->description;
94 }
95
EVP_KDF_is_a(const EVP_KDF * kdf,const char * name)96 int EVP_KDF_is_a(const EVP_KDF *kdf, const char *name)
97 {
98 return kdf != NULL && evp_is_a(kdf->prov, kdf->name_id, NULL, name);
99 }
100
EVP_KDF_get0_provider(const EVP_KDF * kdf)101 const OSSL_PROVIDER *EVP_KDF_get0_provider(const EVP_KDF *kdf)
102 {
103 return kdf->prov;
104 }
105
EVP_KDF_CTX_kdf(EVP_KDF_CTX * ctx)106 const EVP_KDF *EVP_KDF_CTX_kdf(EVP_KDF_CTX *ctx)
107 {
108 return ctx->meth;
109 }
110
EVP_KDF_CTX_reset(EVP_KDF_CTX * ctx)111 void EVP_KDF_CTX_reset(EVP_KDF_CTX *ctx)
112 {
113 if (ctx == NULL)
114 return;
115
116 if (ctx->meth->reset != NULL)
117 ctx->meth->reset(ctx->algctx);
118 }
119
EVP_KDF_CTX_get_kdf_size(EVP_KDF_CTX * ctx)120 size_t EVP_KDF_CTX_get_kdf_size(EVP_KDF_CTX *ctx)
121 {
122 OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
123 size_t s = 0;
124
125 if (ctx == NULL)
126 return 0;
127
128 *params = OSSL_PARAM_construct_size_t(OSSL_KDF_PARAM_SIZE, &s);
129 if (ctx->meth->get_ctx_params != NULL
130 && ctx->meth->get_ctx_params(ctx->algctx, params))
131 return s;
132 if (ctx->meth->get_params != NULL
133 && ctx->meth->get_params(params))
134 return s;
135 return 0;
136 }
137
EVP_KDF_derive(EVP_KDF_CTX * ctx,unsigned char * key,size_t keylen,const OSSL_PARAM params[])138 int EVP_KDF_derive(EVP_KDF_CTX *ctx, unsigned char *key, size_t keylen,
139 const OSSL_PARAM params[])
140 {
141 if (ctx == NULL)
142 return 0;
143
144 return ctx->meth->derive(ctx->algctx, key, keylen, params);
145 }
146
147 /*
148 * The {get,set}_params functions return 1 if there is no corresponding
149 * function in the implementation. This is the same as if there was one,
150 * but it didn't recognise any of the given params, i.e. nothing in the
151 * bag of parameters was useful.
152 */
EVP_KDF_get_params(EVP_KDF * kdf,OSSL_PARAM params[])153 int EVP_KDF_get_params(EVP_KDF *kdf, OSSL_PARAM params[])
154 {
155 if (kdf->get_params != NULL)
156 return kdf->get_params(params);
157 return 1;
158 }
159
EVP_KDF_CTX_get_params(EVP_KDF_CTX * ctx,OSSL_PARAM params[])160 int EVP_KDF_CTX_get_params(EVP_KDF_CTX *ctx, OSSL_PARAM params[])
161 {
162 if (ctx->meth->get_ctx_params != NULL)
163 return ctx->meth->get_ctx_params(ctx->algctx, params);
164 return 1;
165 }
166
EVP_KDF_CTX_set_params(EVP_KDF_CTX * ctx,const OSSL_PARAM params[])167 int EVP_KDF_CTX_set_params(EVP_KDF_CTX *ctx, const OSSL_PARAM params[])
168 {
169 if (ctx->meth->set_ctx_params != NULL)
170 return ctx->meth->set_ctx_params(ctx->algctx, params);
171 return 1;
172 }
173
EVP_KDF_names_do_all(const EVP_KDF * kdf,void (* fn)(const char * name,void * data),void * data)174 int EVP_KDF_names_do_all(const EVP_KDF *kdf,
175 void (*fn)(const char *name, void *data),
176 void *data)
177 {
178 if (kdf->prov != NULL)
179 return evp_names_do_all(kdf->prov, kdf->name_id, fn, data);
180
181 return 1;
182 }
183
