crypto/evp/kdf_lib.c

   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
  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
  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
  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
  81 int evp_kdf_get_number(const EVP_KDF *kdf)
  82 {
  83     return kdf->name_id;
  84 }
  85
  86 const char *EVP_KDF_get0_name(const EVP_KDF *kdf)
  87 {
  88     return kdf->type_name;
  89 }
  90
  91 const char *EVP_KDF_get0_description(const EVP_KDF *kdf)
  92 {
  93     return kdf->description;
  94 }
  95
  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
 101 const OSSL_PROVIDER *EVP_KDF_get0_provider(const EVP_KDF *kdf)
 102 {
 103     return kdf->prov;
 104 }
 105
 106 const EVP_KDF *EVP_KDF_CTX_kdf(EVP_KDF_CTX *ctx)
 107 {
 108     return ctx->meth;
 109 }
 110
 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
 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
 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  */
 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
 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
 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
 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 }