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      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 }
     84