demos/cms/cms_dec.c

   1 /* Simple S/MIME decryption example */
   2 #include <openssl/pem.h>
   3 #include <openssl/cms.h>
   4 #include <openssl/err.h>
   5
   6 int main(int argc, char **argv)
   7 {
   8     BIO *in = NULL, *out = NULL, *tbio = NULL;
   9     X509 *rcert = NULL;
  10     EVP_PKEY *rkey = NULL;
  11     CMS_ContentInfo *cms = NULL;
  12     int ret = 1;
  13
  14     OpenSSL_add_all_algorithms();
  15     ERR_load_crypto_strings();
  16
  17     /* Read in recipient certificate and private key */
  18     tbio = BIO_new_file("signer.pem", "r");
  19
  20     if (!tbio)
  21         goto err;
  22
  23     rcert = PEM_read_bio_X509(tbio, NULL, 0, NULL);
  24
  25     BIO_reset(tbio);
  26
  27     rkey = PEM_read_bio_PrivateKey(tbio, NULL, 0, NULL);
  28
  29     if (!rcert || !rkey)
  30         goto err;
  31
  32     /* Open S/MIME message to decrypt */
  33
  34     in = BIO_new_file("smencr.txt", "r");
  35
  36     if (!in)
  37         goto err;
  38
  39     /* Parse message */
  40     cms = SMIME_read_CMS(in, NULL);
  41
  42     if (!cms)
  43         goto err;
  44
  45     out = BIO_new_file("decout.txt", "w");
  46     if (!out)
  47         goto err;
  48
  49     /* Decrypt S/MIME message */
  50     if (!CMS_decrypt(cms, rkey, rcert, NULL, out, 0))
  51         goto err;
  52
  53     ret = 0;
  54
  55  err:
  56
  57     if (ret) {
  58         fprintf(stderr, "Error Decrypting Data\n");
  59         ERR_print_errors_fp(stderr);
  60     }
  61
  62     if (cms)
  63         CMS_ContentInfo_free(cms);
  64     if (rcert)
  65         X509_free(rcert);
  66     if (rkey)
  67         EVP_PKEY_free(rkey);
  68
  69     if (in)
  70         BIO_free(in);
  71     if (out)
  72         BIO_free(out);
  73     if (tbio)
  74         BIO_free(tbio);
  75
  76     return ret;
  77
  78 }