2 * Copyright 2008-2023 The OpenSSL Project Authors. All Rights Reserved.
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
10 /* S/MIME signing example: 2 signers */
11 #include <openssl/pem.h>
12 #include <openssl/cms.h>
13 #include <openssl/err.h>
15 int main(int argc, char **argv)
17 BIO *in = NULL, *out = NULL, *tbio = NULL;
18 X509 *scert = NULL, *scert2 = NULL;
19 EVP_PKEY *skey = NULL, *skey2 = NULL;
20 CMS_ContentInfo *cms = NULL;
21 int ret = EXIT_FAILURE;
23 OpenSSL_add_all_algorithms();
24 ERR_load_crypto_strings();
26 tbio = BIO_new_file("signer.pem", "r");
31 scert = PEM_read_bio_X509(tbio, NULL, 0, NULL);
33 if (BIO_reset(tbio) < 0)
36 skey = PEM_read_bio_PrivateKey(tbio, NULL, 0, NULL);
40 tbio = BIO_new_file("signer2.pem", "r");
45 scert2 = PEM_read_bio_X509(tbio, NULL, 0, NULL);
47 if (BIO_reset(tbio) < 0)
50 skey2 = PEM_read_bio_PrivateKey(tbio, NULL, 0, NULL);
52 if (!scert2 || !skey2)
55 in = BIO_new_file("sign.txt", "r");
60 cms = CMS_sign(NULL, NULL, NULL, in, CMS_STREAM | CMS_PARTIAL);
65 /* Add each signer in turn */
67 if (!CMS_add1_signer(cms, scert, skey, NULL, 0))
70 if (!CMS_add1_signer(cms, scert2, skey2, NULL, 0))
73 out = BIO_new_file("smout.txt", "w");
77 /* NB: content included and finalized by SMIME_write_CMS */
79 if (!SMIME_write_CMS(out, cms, in, CMS_STREAM))
82 printf("Signing Successful\n");
86 if (ret != EXIT_SUCCESS) {
87 fprintf(stderr, "Error Signing Data\n");
88 ERR_print_errors_fp(stderr);
91 CMS_ContentInfo_free(cms);