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_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
  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         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
  83 int evp_kdf_get_number(const EVP_KDF *kdf)
  84 {
  85     return kdf->name_id;
  86 }
  87
  88 const char *EVP_KDF_get0_name(const EVP_KDF *kdf)
  89 {
  90     return kdf->type_name;
  91 }
  92
  93 const char *EVP_KDF_get0_description(const EVP_KDF *kdf)
  94 {
  95     return kdf->description;
  96 }
  97
  98 int EVP_KDF_is_a(const EVP_KDF *kdf, const char *name)
  99 {
 100     return kdf != NULL && evp_is_a(kdf->prov, kdf->name_id, NULL, name);
 101 }
 102
 103 const OSSL_PROVIDER *EVP_KDF_get0_provider(const EVP_KDF *kdf)
 104 {
 105     return kdf->prov;
 106 }
 107
 108 const EVP_KDF *EVP_KDF_CTX_kdf(EVP_KDF_CTX *ctx)
 109 {
 110     return ctx->meth;
 111 }
 112
 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
 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
 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  */
 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
 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
 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
 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 }