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/engine.h>
  15 #include <openssl/evp.h>
  16 #include <openssl/x509v3.h>
  17 #include <openssl/kdf.h>
  18 #include <openssl/core.h>
  19 #include <openssl/core_names.h>
  20 #include "crypto/asn1.h"
  21 #include "crypto/evp.h"
  22 #include "internal/numbers.h"
  23 #include "internal/provider.h"
  24 #include "evp_local.h"
  25
  26 EVP_KDF_CTX *EVP_KDF_CTX_new(EVP_KDF *kdf)
  27 {
  28     EVP_KDF_CTX *ctx = NULL;
  29
  30     if (kdf == NULL)
  31         return NULL;
  32
  33     ctx = OPENSSL_zalloc(sizeof(EVP_KDF_CTX));
  34     if (ctx == NULL
  35         || (ctx->algctx = kdf->newctx(ossl_provider_ctx(kdf->prov))) == NULL
  36         || !EVP_KDF_up_ref(kdf)) {
  37         ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
  38         if (ctx != NULL)
  39             kdf->freectx(ctx->algctx);
  40         OPENSSL_free(ctx);
  41         ctx = NULL;
  42     } else {
  43         ctx->meth = kdf;
  44     }
  45     return ctx;
  46 }
  47
  48 void EVP_KDF_CTX_free(EVP_KDF_CTX *ctx)
  49 {
  50     if (ctx == NULL)
  51         return;
  52     ctx->meth->freectx(ctx->algctx);
  53     ctx->algctx = NULL;
  54     EVP_KDF_free(ctx->meth);
  55     OPENSSL_free(ctx);
  56 }
  57
  58 EVP_KDF_CTX *EVP_KDF_CTX_dup(const EVP_KDF_CTX *src)
  59 {
  60     EVP_KDF_CTX *dst;
  61
  62     if (src == NULL || src->algctx == NULL || src->meth->dupctx == NULL)
  63         return NULL;
  64
  65     dst = OPENSSL_malloc(sizeof(*dst));
  66     if (dst == NULL) {
  67         ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
  68         return NULL;
  69     }
  70
  71     memcpy(dst, src, sizeof(*dst));
  72     if (!EVP_KDF_up_ref(dst->meth)) {
  73         ERR_raise(ERR_LIB_EVP, ERR_R_MALLOC_FAILURE);
  74         OPENSSL_free(dst);
  75         return NULL;
  76     }
  77
  78     dst->algctx = src->meth->dupctx(src->algctx);
  79     if (dst->algctx == NULL) {
  80         EVP_KDF_CTX_free(dst);
  81         return NULL;
  82     }
  83     return dst;
  84 }
  85
  86 int EVP_KDF_number(const EVP_KDF *kdf)
  87 {
  88     return kdf->name_id;
  89 }
  90
  91 const char *EVP_KDF_name(const EVP_KDF *kdf)
  92 {
  93     return kdf->type_name;
  94 }
  95
  96 const char *EVP_KDF_description(const EVP_KDF *kdf)
  97 {
  98     return kdf->description;
  99 }
 100
 101 int EVP_KDF_is_a(const EVP_KDF *kdf, const char *name)
 102 {
 103     return evp_is_a(kdf->prov, kdf->name_id, NULL, name);
 104 }
 105
 106 const OSSL_PROVIDER *EVP_KDF_provider(const EVP_KDF *kdf)
 107 {
 108     return kdf->prov;
 109 }
 110
 111 const EVP_KDF *EVP_KDF_CTX_kdf(EVP_KDF_CTX *ctx)
 112 {
 113     return ctx->meth;
 114 }
 115
 116 void EVP_KDF_CTX_reset(EVP_KDF_CTX *ctx)
 117 {
 118     if (ctx == NULL)
 119         return;
 120
 121     if (ctx->meth->reset != NULL)
 122         ctx->meth->reset(ctx->algctx);
 123 }
 124
 125 size_t EVP_KDF_CTX_get_kdf_size(EVP_KDF_CTX *ctx)
 126 {
 127     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
 128     size_t s;
 129
 130     if (ctx == NULL)
 131         return 0;
 132
 133     *params = OSSL_PARAM_construct_size_t(OSSL_KDF_PARAM_SIZE, &s);
 134     if (ctx->meth->get_ctx_params != NULL
 135         && ctx->meth->get_ctx_params(ctx->algctx, params))
 136             return s;
 137     if (ctx->meth->get_params != NULL
 138         && ctx->meth->get_params(params))
 139             return s;
 140     return 0;
 141 }
 142
 143 int EVP_KDF_derive(EVP_KDF_CTX *ctx, unsigned char *key, size_t keylen,
 144                    const OSSL_PARAM params[])
 145 {
 146     if (ctx == NULL)
 147         return 0;
 148
 149     return ctx->meth->derive(ctx->algctx, key, keylen, params);
 150 }
 151
 152 /*
 153  * The {get,set}_params functions return 1 if there is no corresponding
 154  * function in the implementation.  This is the same as if there was one,
 155  * but it didn't recognise any of the given params, i.e. nothing in the
 156  * bag of parameters was useful.
 157  */
 158 int EVP_KDF_get_params(EVP_KDF *kdf, OSSL_PARAM params[])
 159 {
 160     if (kdf->get_params != NULL)
 161         return kdf->get_params(params);
 162     return 1;
 163 }
 164
 165 int EVP_KDF_CTX_get_params(EVP_KDF_CTX *ctx, OSSL_PARAM params[])
 166 {
 167     if (ctx->meth->get_ctx_params != NULL)
 168         return ctx->meth->get_ctx_params(ctx->algctx, params);
 169     return 1;
 170 }
 171
 172 int EVP_KDF_CTX_set_params(EVP_KDF_CTX *ctx, const OSSL_PARAM params[])
 173 {
 174     if (ctx->meth->set_ctx_params != NULL)
 175         return ctx->meth->set_ctx_params(ctx->algctx, params);
 176     return 1;
 177 }
 178
 179 int EVP_KDF_names_do_all(const EVP_KDF *kdf,
 180                          void (*fn)(const char *name, void *data),
 181                          void *data)
 182 {
 183     if (kdf->prov != NULL)
 184         return evp_names_do_all(kdf->prov, kdf->name_id, fn, data);
 185
 186     return 1;
 187 }