demos/cms/cms_uncomp.c

   1 /*
   2  * Copyright 2008-2023 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 /* Simple S/MIME uncompression example */
  11 #include <openssl/pem.h>
  12 #include <openssl/cms.h>
  13 #include <openssl/err.h>
  14
  15 int main(int argc, char **argv)
  16 {
  17     BIO *in = NULL, *out = NULL;
  18     CMS_ContentInfo *cms = NULL;
  19     int ret = EXIT_FAILURE;
  20
  21     OpenSSL_add_all_algorithms();
  22     ERR_load_crypto_strings();
  23
  24     /* Open compressed content */
  25
  26     in = BIO_new_file("smcomp.txt", "r");
  27
  28     if (!in)
  29         goto err;
  30
  31     /* Sign content */
  32     cms = SMIME_read_CMS(in, NULL);
  33
  34     if (!cms)
  35         goto err;
  36
  37     out = BIO_new_file("smuncomp.txt", "w");
  38     if (!out)
  39         goto err;
  40
  41     /* Uncompress S/MIME message */
  42     if (!CMS_uncompress(cms, out, NULL, 0))
  43         goto err;
  44
  45     ret = EXIT_SUCCESS;
  46  err:
  47     if (ret != EXIT_SUCCESS) {
  48         fprintf(stderr, "Error Uncompressing Data\n");
  49         ERR_print_errors_fp(stderr);
  50     }
  51
  52     CMS_ContentInfo_free(cms);
  53     BIO_free(in);
  54     BIO_free(out);
  55     return ret;
  56 }