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Member "libzip-1.5.2/lib/zip_crypto_mbedtls.c" (12 Mar 2019, 4741 Bytes) of package /linux/misc/libzip-1.5.2.tar.xz:


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    1 /*
    2   zip_crypto_mbedtls.c -- mbed TLS wrapper
    3   Copyright (C) 2018 Dieter Baron and Thomas Klausner
    4 
    5   This file is part of libzip, a library to manipulate ZIP archives.
    6   The authors can be contacted at <libzip@nih.at>
    7 
    8   Redistribution and use in source and binary forms, with or without
    9   modification, are permitted provided that the following conditions
   10   are met:
   11   1. Redistributions of source code must retain the above copyright
   12   notice, this list of conditions and the following disclaimer.
   13   2. Redistributions in binary form must reproduce the above copyright
   14   notice, this list of conditions and the following disclaimer in
   15   the documentation and/or other materials provided with the
   16   distribution.
   17   3. The names of the authors may not be used to endorse or promote
   18   products derived from this software without specific prior
   19   written permission.
   20 
   21   THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
   22   OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   23   WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24   ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
   25   DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   26   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
   27   GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   28   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
   29   IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
   30   OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
   31   IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   32 */
   33 
   34 #include <stdlib.h>
   35 
   36 #include "zipint.h"
   37 #include "zip_crypto.h"
   38 
   39 #include <mbedtls/ctr_drbg.h>
   40 #include <mbedtls/entropy.h>
   41 #include <mbedtls/pkcs5.h>
   42 
   43 
   44 _zip_crypto_aes_t *
   45 _zip_crypto_aes_new(const zip_uint8_t *key, zip_uint16_t key_size, zip_error_t *error) {
   46     _zip_crypto_aes_t *aes;
   47 
   48     if ((aes = (_zip_crypto_aes_t *)malloc(sizeof(*aes))) == NULL) {
   49     zip_error_set(error, ZIP_ER_MEMORY, 0);
   50     return NULL;
   51     }
   52 
   53     mbedtls_aes_init(aes);
   54     mbedtls_aes_setkey_enc(aes, (const unsigned char *)key, (unsigned int)key_size);
   55 
   56     return aes;
   57 }
   58 
   59 void
   60 _zip_crypto_aes_free(_zip_crypto_aes_t *aes) {
   61     if (aes == NULL) {
   62     return;
   63     }
   64 
   65     mbedtls_aes_free(aes);
   66     free(aes);
   67 }
   68 
   69 
   70 _zip_crypto_hmac_t *
   71 _zip_crypto_hmac_new(const zip_uint8_t *secret, zip_uint64_t secret_length, zip_error_t *error) {
   72     _zip_crypto_hmac_t *hmac;
   73 
   74     if (secret_length > INT_MAX) {
   75     zip_error_set(error, ZIP_ER_INVAL, 0);
   76     return NULL;
   77     }
   78 
   79     if ((hmac = (_zip_crypto_hmac_t *)malloc(sizeof(*hmac))) == NULL) {
   80     zip_error_set(error, ZIP_ER_MEMORY, 0);
   81     return NULL;
   82     }
   83 
   84     mbedtls_md_init(hmac);
   85 
   86     if (mbedtls_md_setup(hmac, mbedtls_md_info_from_type(MBEDTLS_MD_SHA1), 1) != 0) {
   87     zip_error_set(error, ZIP_ER_INTERNAL, 0);
   88     free(hmac);
   89     return NULL;
   90     }
   91 
   92     if (mbedtls_md_hmac_starts(hmac, (const unsigned char *)secret, (size_t)secret_length) != 0) {
   93     zip_error_set(error, ZIP_ER_INTERNAL, 0);
   94     free(hmac);
   95     return NULL;
   96     }
   97 
   98     return hmac;
   99 }
  100 
  101 
  102 void
  103 _zip_crypto_hmac_free(_zip_crypto_hmac_t *hmac) {
  104     if (hmac == NULL) {
  105     return;
  106     }
  107 
  108     mbedtls_md_free(hmac);
  109     free(hmac);
  110 }
  111 
  112 
  113 bool
  114 _zip_crypto_pbkdf2(const zip_uint8_t *key, zip_uint64_t key_length, const zip_uint8_t *salt, zip_uint16_t salt_length, int iterations, zip_uint8_t *output, zip_uint64_t output_length) {
  115     mbedtls_md_context_t sha1_ctx;
  116     bool ok = true;
  117 
  118     mbedtls_md_init(&sha1_ctx);
  119 
  120     if (mbedtls_md_setup(&sha1_ctx, mbedtls_md_info_from_type(MBEDTLS_MD_SHA1), 1) != 0) {
  121     ok = false;
  122     }
  123 
  124     if (ok && mbedtls_pkcs5_pbkdf2_hmac(&sha1_ctx, (const unsigned char *)key, (size_t)key_length, (const unsigned char *)salt, (size_t)salt_length, (unsigned int)iterations, (uint32_t)output_length, (unsigned char *)output) != 0) {
  125     ok = false;
  126     }
  127 
  128     mbedtls_md_free(&sha1_ctx);
  129     return ok;
  130 }
  131 
  132 
  133 typedef struct {
  134     mbedtls_entropy_context entropy;
  135     mbedtls_ctr_drbg_context ctr_drbg;
  136 } zip_random_context_t;
  137 
  138 ZIP_EXTERN bool
  139 zip_random(zip_uint8_t *buffer, zip_uint16_t length) {
  140     static zip_random_context_t *ctx = NULL;
  141     const unsigned char *pers = "zip_crypto_mbedtls";
  142 
  143     if (!ctx) {
  144     ctx = (zip_random_context_t *)malloc(sizeof(zip_random_context_t));
  145     if (!ctx) {
  146         return false;
  147     }
  148     mbedtls_entropy_init(&ctx->entropy);
  149     mbedtls_ctr_drbg_init(&ctx->ctr_drbg);
  150     if (mbedtls_ctr_drbg_seed(&ctx->ctr_drbg, mbedtls_entropy_func, &ctx->entropy, pers, strlen(pers)) != 0) {
  151         mbedtls_ctr_drbg_free(&ctx->ctr_drbg);
  152         mbedtls_entropy_free(&ctx->entropy);
  153         free(ctx);
  154         ctx = NULL;
  155         return false;
  156     }
  157     }
  158 
  159     return mbedtls_ctr_drbg_random(&ctx->ctr_drbg, (unsigned char *)buffer, (size_t)length) == 0;
  160 }