demos/cms/cms_dec.c

   1 /*
   2  * Copyright 2008-2016 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 decryption 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;
  18     X509 *rcert = NULL;
  19     EVP_PKEY *rkey = NULL;
  20     CMS_ContentInfo *cms = NULL;
  21     int ret = EXIT_FAILURE;
  22
  23     OpenSSL_add_all_algorithms();
  24     ERR_load_crypto_strings();
  25
  26     /* Read in recipient certificate and private key */
  27     tbio = BIO_new_file("signer.pem", "r");
  28
  29     if (!tbio)
  30         goto err;
  31
  32     rcert = PEM_read_bio_X509(tbio, NULL, 0, NULL);
  33
  34     BIO_reset(tbio);
  35
  36     rkey = PEM_read_bio_PrivateKey(tbio, NULL, 0, NULL);
  37
  38     if (!rcert || !rkey)
  39         goto err;
  40
  41     /* Open S/MIME message to decrypt */
  42
  43     in = BIO_new_file("smencr.txt", "r");
  44
  45     if (!in)
  46         goto err;
  47
  48     /* Parse message */
  49     cms = SMIME_read_CMS(in, NULL);
  50
  51     if (!cms)
  52         goto err;
  53
  54     out = BIO_new_file("decout.txt", "w");
  55     if (!out)
  56         goto err;
  57
  58     /* Decrypt S/MIME message */
  59     if (!CMS_decrypt(cms, rkey, rcert, NULL, out, 0))
  60         goto err;
  61
  62     ret = EXIT_SUCCESS;
  63
  64  err:
  65     if (ret != EXIT_SUCCESS) {
  66         fprintf(stderr, "Error Decrypting Data\n");
  67         ERR_print_errors_fp(stderr);
  68     }
  69
  70     CMS_ContentInfo_free(cms);
  71     X509_free(rcert);
  72     EVP_PKEY_free(rkey);
  73     BIO_free(in);
  74     BIO_free(out);
  75     BIO_free(tbio);
  76     return ret;
  77 }