demos/cms/cms_ver.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 verification 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, *tbio = NULL, *cont = NULL;
  18     X509_STORE *st = NULL;
  19     X509 *cacert = NULL;
  20     CMS_ContentInfo *cms = NULL;
  21     int ret = EXIT_FAILURE;
  22
  23     OpenSSL_add_all_algorithms();
  24     ERR_load_crypto_strings();
  25
  26     /* Set up trusted CA certificate store */
  27
  28     st = X509_STORE_new();
  29     if (st == NULL)
  30         goto err;
  31
  32     /* Read in CA certificate */
  33     tbio = BIO_new_file("cacert.pem", "r");
  34
  35     if (tbio == NULL)
  36         goto err;
  37
  38     cacert = PEM_read_bio_X509(tbio, NULL, 0, NULL);
  39
  40     if (cacert == NULL)
  41         goto err;
  42
  43     if (!X509_STORE_add_cert(st, cacert))
  44         goto err;
  45
  46     /* Open message being verified */
  47
  48     in = BIO_new_file("smout.txt", "r");
  49
  50     if (in == NULL)
  51         goto err;
  52
  53     /* parse message */
  54     cms = SMIME_read_CMS(in, &cont);
  55
  56     if (cms == NULL)
  57         goto err;
  58
  59     /* File to output verified content to */
  60     out = BIO_new_file("smver.txt", "w");
  61     if (out == NULL)
  62         goto err;
  63
  64     if (!CMS_verify(cms, NULL, st, cont, out, 0)) {
  65         fprintf(stderr, "Verification Failure\n");
  66         goto err;
  67     }
  68
  69     fprintf(stderr, "Verification Successful\n");
  70
  71     ret = EXIT_SUCCESS;
  72  err:
  73     if (ret != EXIT_SUCCESS) {
  74         fprintf(stderr, "Error Verifying Data\n");
  75         ERR_print_errors_fp(stderr);
  76     }
  77
  78     X509_STORE_free(st);
  79     CMS_ContentInfo_free(cms);
  80     X509_free(cacert);
  81     BIO_free(in);
  82     BIO_free(out);
  83     BIO_free(tbio);
  84     return ret;
  85 }