demos/smime/smver.c

   1 /*
   2  * Copyright 2007-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (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/pkcs7.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     PKCS7 *p7 = NULL;
  21
  22     int ret = 1;
  23
  24     OpenSSL_add_all_algorithms();
  25     ERR_load_crypto_strings();
  26
  27     /* Set up trusted CA certificate store */
  28
  29     st = X509_STORE_new();
  30
  31     /* Read in signer certificate and private key */
  32     tbio = BIO_new_file("cacert.pem", "r");
  33
  34     if (!tbio)
  35         goto err;
  36
  37     cacert = PEM_read_bio_X509(tbio, NULL, 0, NULL);
  38
  39     if (!cacert)
  40         goto err;
  41
  42     if (!X509_STORE_add_cert(st, cacert))
  43         goto err;
  44
  45     /* Open content being signed */
  46
  47     in = BIO_new_file("smout.txt", "r");
  48
  49     if (!in)
  50         goto err;
  51
  52     /* Sign content */
  53     p7 = SMIME_read_PKCS7(in, &cont);
  54
  55     if (!p7)
  56         goto err;
  57
  58     /* File to output verified content to */
  59     out = BIO_new_file("smver.txt", "w");
  60     if (!out)
  61         goto err;
  62
  63     if (!PKCS7_verify(p7, NULL, st, cont, out, 0)) {
  64         fprintf(stderr, "Verification Failure\n");
  65         goto err;
  66     }
  67
  68     fprintf(stderr, "Verification Successful\n");
  69
  70     ret = 0;
  71
  72  err:
  73     if (ret) {
  74         fprintf(stderr, "Error Verifying Data\n");
  75         ERR_print_errors_fp(stderr);
  76     }
  77     PKCS7_free(p7);
  78     X509_free(cacert);
  79     BIO_free(in);
  80     BIO_free(out);
  81     BIO_free(tbio);
  82     return ret;
  83 }