demos/smime/smsign2.c

   1 /*
   2  * Copyright 2007-2023 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 /* S/MIME signing example: 2 signers */
  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;
  18     X509 *scert = NULL, *scert2 = NULL;
  19     EVP_PKEY *skey = NULL, *skey2 = NULL;
  20     PKCS7 *p7 = NULL;
  21     int ret = EXIT_FAILURE;
  22
  23     OpenSSL_add_all_algorithms();
  24     ERR_load_crypto_strings();
  25
  26     tbio = BIO_new_file("signer.pem", "r");
  27
  28     if (!tbio)
  29         goto err;
  30
  31     scert = PEM_read_bio_X509(tbio, NULL, 0, NULL);
  32
  33     if (BIO_reset(tbio) < 0)
  34         goto err;
  35
  36     skey = PEM_read_bio_PrivateKey(tbio, NULL, 0, NULL);
  37
  38     BIO_free(tbio);
  39
  40     tbio = BIO_new_file("signer2.pem", "r");
  41
  42     if (!tbio)
  43         goto err;
  44
  45     scert2 = PEM_read_bio_X509(tbio, NULL, 0, NULL);
  46
  47     if (BIO_reset(tbio) < 0)
  48         goto err;
  49
  50     skey2 = PEM_read_bio_PrivateKey(tbio, NULL, 0, NULL);
  51
  52     if (!scert2 || !skey2)
  53         goto err;
  54
  55     in = BIO_new_file("sign.txt", "r");
  56
  57     if (!in)
  58         goto err;
  59
  60     p7 = PKCS7_sign(NULL, NULL, NULL, in, PKCS7_STREAM | PKCS7_PARTIAL);
  61
  62     if (!p7)
  63         goto err;
  64
  65     /* Add each signer in turn */
  66
  67     if (!PKCS7_sign_add_signer(p7, scert, skey, NULL, 0))
  68         goto err;
  69
  70     if (!PKCS7_sign_add_signer(p7, scert2, skey2, NULL, 0))
  71         goto err;
  72
  73     out = BIO_new_file("smout.txt", "w");
  74     if (!out)
  75         goto err;
  76
  77     /* NB: content included and finalized by SMIME_write_PKCS7 */
  78
  79     if (!SMIME_write_PKCS7(out, p7, in, PKCS7_STREAM))
  80         goto err;
  81
  82     printf("Success\n");
  83
  84     ret = EXIT_SUCCESS;
  85  err:
  86     if (ret != EXIT_SUCCESS) {
  87         fprintf(stderr, "Error Signing Data\n");
  88         ERR_print_errors_fp(stderr);
  89     }
  90     PKCS7_free(p7);
  91     X509_free(scert);
  92     EVP_PKEY_free(skey);
  93     X509_free(scert2);
  94     EVP_PKEY_free(skey2);
  95     BIO_free(in);
  96     BIO_free(out);
  97     BIO_free(tbio);
  98     return ret;
  99 }