crypto/evp/kdf_lib.c

   1 /*
   2  * Copyright 2018-2020 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->data = kdf->newctx(ossl_provider_ctx(kdf->prov))) == NULL
  36         || !EVP_KDF_up_ref(kdf)) {
  37         EVPerr(EVP_F_EVP_KDF_CTX_NEW, ERR_R_MALLOC_FAILURE);
  38         if (ctx != NULL)
  39             kdf->freectx(ctx->data);
  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         ctx->meth->freectx(ctx->data);
  52         ctx->data = NULL;
  53         EVP_KDF_free(ctx->meth);
  54         OPENSSL_free(ctx);
  55     }
  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->data == NULL || src->meth->dupctx == NULL)
  63         return NULL;
  64
  65     dst = OPENSSL_malloc(sizeof(*dst));
  66     if (dst == NULL) {
  67         EVPerr(EVP_F_EVP_KDF_CTX_DUP, ERR_R_MALLOC_FAILURE);
  68         return NULL;
  69     }
  70
  71     memcpy(dst, src, sizeof(*dst));
  72     if (!EVP_KDF_up_ref(dst->meth)) {
  73         EVPerr(EVP_F_EVP_KDF_CTX_DUP, ERR_R_MALLOC_FAILURE);
  74         OPENSSL_free(dst);
  75         return NULL;
  76     }
  77
  78     dst->data = src->meth->dupctx(src->data);
  79     if (dst->data == 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 int EVP_KDF_is_a(const EVP_KDF *kdf, const char *name)
  92 {
  93     return evp_is_a(kdf->prov, kdf->name_id, NULL, name);
  94 }
  95
  96 const OSSL_PROVIDER *EVP_KDF_provider(const EVP_KDF *kdf)
  97 {
  98     return kdf->prov;
  99 }
 100
 101 const EVP_KDF *EVP_KDF_CTX_kdf(EVP_KDF_CTX *ctx)
 102 {
 103     return ctx->meth;
 104 }
 105
 106 void EVP_KDF_reset(EVP_KDF_CTX *ctx)
 107 {
 108     if (ctx == NULL)
 109         return;
 110
 111     if (ctx->meth->reset != NULL)
 112         ctx->meth->reset(ctx->data);
 113 }
 114
 115 size_t EVP_KDF_size(EVP_KDF_CTX *ctx)
 116 {
 117     OSSL_PARAM params[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
 118     size_t s;
 119
 120     if (ctx == NULL)
 121         return 0;
 122
 123     *params = OSSL_PARAM_construct_size_t(OSSL_KDF_PARAM_SIZE, &s);
 124     if (ctx->meth->get_ctx_params != NULL
 125         && ctx->meth->get_ctx_params(ctx->data, params))
 126             return s;
 127     if (ctx->meth->get_params != NULL
 128         && ctx->meth->get_params(params))
 129             return s;
 130     return 0;
 131 }
 132
 133 int EVP_KDF_derive(EVP_KDF_CTX *ctx, unsigned char *key, size_t keylen)
 134 {
 135     if (ctx == NULL)
 136         return 0;
 137
 138     return ctx->meth->derive(ctx->data, key, keylen);
 139 }
 140
 141 /*
 142  * The {get,set}_params functions return 1 if there is no corresponding
 143  * function in the implementation.  This is the same as if there was one,
 144  * but it didn't recognise any of the given params, i.e. nothing in the
 145  * bag of parameters was useful.
 146  */
 147 int EVP_KDF_get_params(EVP_KDF *kdf, OSSL_PARAM params[])
 148 {
 149     if (kdf->get_params != NULL)
 150         return kdf->get_params(params);
 151     return 1;
 152 }
 153
 154 int EVP_KDF_CTX_get_params(EVP_KDF_CTX *ctx, OSSL_PARAM params[])
 155 {
 156     if (ctx->meth->get_ctx_params != NULL)
 157         return ctx->meth->get_ctx_params(ctx->data, params);
 158     return 1;
 159 }
 160
 161 int EVP_KDF_CTX_set_params(EVP_KDF_CTX *ctx, const OSSL_PARAM params[])
 162 {
 163     if (ctx->meth->set_ctx_params != NULL)
 164         return ctx->meth->set_ctx_params(ctx->data, params);
 165     return 1;
 166 }
 167
 168 void EVP_KDF_names_do_all(const EVP_KDF *kdf,
 169                           void (*fn)(const char *name, void *data),
 170                           void *data)
 171 {
 172     if (kdf->prov != NULL)
 173         evp_names_do_all(kdf->prov, kdf->name_id, fn, data);
 174 }