demos/smime/smver.c

   1 /* Simple S/MIME verification example */
   2 #include <openssl/pem.h>
   3 #include <openssl/pkcs7.h>
   4 #include <openssl/err.h>
   5
   6 int main(int argc, char **argv)
   7 {
   8     BIO *in = NULL, *out = NULL, *tbio = NULL, *cont = NULL;
   9     X509_STORE *st = NULL;
  10     X509 *cacert = NULL;
  11     PKCS7 *p7 = NULL;
  12
  13     int ret = 1;
  14
  15     OpenSSL_add_all_algorithms();
  16     ERR_load_crypto_strings();
  17
  18     /* Set up trusted CA certificate store */
  19
  20     st = X509_STORE_new();
  21
  22     /* Read in signer certificate and private key */
  23     tbio = BIO_new_file("cacert.pem", "r");
  24
  25     if (!tbio)
  26         goto err;
  27
  28     cacert = PEM_read_bio_X509(tbio, NULL, 0, NULL);
  29
  30     if (!cacert)
  31         goto err;
  32
  33     if (!X509_STORE_add_cert(st, cacert))
  34         goto err;
  35
  36     /* Open content being signed */
  37
  38     in = BIO_new_file("smout.txt", "r");
  39
  40     if (!in)
  41         goto err;
  42
  43     /* Sign content */
  44     p7 = SMIME_read_PKCS7(in, &cont);
  45
  46     if (!p7)
  47         goto err;
  48
  49     /* File to output verified content to */
  50     out = BIO_new_file("smver.txt", "w");
  51     if (!out)
  52         goto err;
  53
  54     if (!PKCS7_verify(p7, NULL, st, cont, out, 0)) {
  55         fprintf(stderr, "Verification Failure\n");
  56         goto err;
  57     }
  58
  59     fprintf(stderr, "Verification Successful\n");
  60
  61     ret = 0;
  62
  63  err:
  64
  65     if (ret) {
  66         fprintf(stderr, "Error Verifying Data\n");
  67         ERR_print_errors_fp(stderr);
  68     }
  69
  70     if (p7)
  71         PKCS7_free(p7);
  72
  73     if (cacert)
  74         X509_free(cacert);
  75
  76     if (in)
  77         BIO_free(in);
  78     if (out)
  79         BIO_free(out);
  80     if (tbio)
  81         BIO_free(tbio);
  82
  83     return ret;
  84
  85 }