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_MALLOC_FAILURE);
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         ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
65         return NULL;
66     }
67 
68     memcpy(dst, src, sizeof(*dst));
69     if (!EVP_KDF_up_ref(dst->meth)) {
70         ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
71         OPENSSL_free(dst);
72         return NULL;
73     }
74 
75     dst->algctx = src->meth->dupctx(src->algctx);
76     if (dst->algctx == NULL) {
77         EVP_KDF_CTX_free(dst);
78         return NULL;
79     }
80     return dst;
81 }
82 
evp_kdf_get_number(const EVP_KDF * kdf)83 int evp_kdf_get_number(const EVP_KDF *kdf)
84 {
85     return kdf->name_id;
86 }
87 
EVP_KDF_get0_name(const EVP_KDF * kdf)88 const char *EVP_KDF_get0_name(const EVP_KDF *kdf)
89 {
90     return kdf->type_name;
91 }
92 
EVP_KDF_get0_description(const EVP_KDF * kdf)93 const char *EVP_KDF_get0_description(const EVP_KDF *kdf)
94 {
95     return kdf->description;
96 }
97 
EVP_KDF_is_a(const EVP_KDF * kdf,const char * name)98 int EVP_KDF_is_a(const EVP_KDF *kdf, const char *name)
99 {
100     return evp_is_a(kdf->prov, kdf->name_id, NULL, name);
101 }
102 
EVP_KDF_get0_provider(const EVP_KDF * kdf)103 const OSSL_PROVIDER *EVP_KDF_get0_provider(const EVP_KDF *kdf)
104 {
105     return kdf->prov;
106 }
107 
EVP_KDF_CTX_kdf(EVP_KDF_CTX * ctx)108 const EVP_KDF *EVP_KDF_CTX_kdf(EVP_KDF_CTX *ctx)
109 {
110     return ctx->meth;
111 }
112 
EVP_KDF_CTX_reset(EVP_KDF_CTX * ctx)113 void EVP_KDF_CTX_reset(EVP_KDF_CTX *ctx)
114 {
115     if (ctx == NULL)
116         return;
117 
118     if (ctx->meth->reset != NULL)
119         ctx->meth->reset(ctx->algctx);
120 }
121 
EVP_KDF_CTX_get_kdf_size(EVP_KDF_CTX * ctx)122 size_t EVP_KDF_CTX_get_kdf_size(EVP_KDF_CTX *ctx)
123 {
124     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
125     size_t s = 0;
126 
127     if (ctx == NULL)
128         return 0;
129 
130     *params = OSSL_PARAM_construct_size_t(OSSL_KDF_PARAM_SIZE, &s);
131     if (ctx->meth->get_ctx_params != NULL
132         && ctx->meth->get_ctx_params(ctx->algctx, params))
133             return s;
134     if (ctx->meth->get_params != NULL
135         && ctx->meth->get_params(params))
136             return s;
137     return 0;
138 }
139 
EVP_KDF_derive(EVP_KDF_CTX * ctx,unsigned char * key,size_t keylen,const OSSL_PARAM params[])140 int EVP_KDF_derive(EVP_KDF_CTX *ctx, unsigned char *key, size_t keylen,
141                    const OSSL_PARAM params[])
142 {
143     if (ctx == NULL)
144         return 0;
145 
146     return ctx->meth->derive(ctx->algctx, key, keylen, params);
147 }
148 
149 /*
150  * The {get,set}_params functions return 1 if there is no corresponding
151  * function in the implementation.  This is the same as if there was one,
152  * but it didn't recognise any of the given params, i.e. nothing in the
153  * bag of parameters was useful.
154  */
EVP_KDF_get_params(EVP_KDF * kdf,OSSL_PARAM params[])155 int EVP_KDF_get_params(EVP_KDF *kdf, OSSL_PARAM params[])
156 {
157     if (kdf->get_params != NULL)
158         return kdf->get_params(params);
159     return 1;
160 }
161 
EVP_KDF_CTX_get_params(EVP_KDF_CTX * ctx,OSSL_PARAM params[])162 int EVP_KDF_CTX_get_params(EVP_KDF_CTX *ctx, OSSL_PARAM params[])
163 {
164     if (ctx->meth->get_ctx_params != NULL)
165         return ctx->meth->get_ctx_params(ctx->algctx, params);
166     return 1;
167 }
168 
EVP_KDF_CTX_set_params(EVP_KDF_CTX * ctx,const OSSL_PARAM params[])169 int EVP_KDF_CTX_set_params(EVP_KDF_CTX *ctx, const OSSL_PARAM params[])
170 {
171     if (ctx->meth->set_ctx_params != NULL)
172         return ctx->meth->set_ctx_params(ctx->algctx, params);
173     return 1;
174 }
175 
EVP_KDF_names_do_all(const EVP_KDF * kdf,void (* fn)(const char * name,void * data),void * data)176 int EVP_KDF_names_do_all(const EVP_KDF *kdf,
177                          void (*fn)(const char *name, void *data),
178                          void *data)
179 {
180     if (kdf->prov != NULL)
181         return evp_names_do_all(kdf->prov, kdf->name_id, fn, data);
182 
183     return 1;
184 }
185