2 * Copyright 2008-2016 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (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 /* Simple S/MIME encrypt example */
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;
19 STACK_OF(X509) *recips = NULL;
20 CMS_ContentInfo *cms = NULL;
24 * On OpenSSL 1.0.0 and later only:
25 * for streaming set CMS_STREAM
27 int flags = CMS_STREAM;
29 OpenSSL_add_all_algorithms();
30 ERR_load_crypto_strings();
32 /* Read in recipient certificate */
33 tbio = BIO_new_file("signer.pem", "r");
38 rcert = PEM_read_bio_X509(tbio, NULL, 0, NULL);
43 /* Create recipient STACK and add recipient cert to it */
44 recips = sk_X509_new_null();
46 if (!recips || !sk_X509_push(recips, rcert))
50 * sk_X509_pop_free will free up recipient STACK and its contents so set
51 * rcert to NULL so it isn't freed up twice.
55 /* Open content being encrypted */
57 in = BIO_new_file("encr.txt", "r");
63 cms = CMS_encrypt(recips, in, EVP_des_ede3_cbc(), flags);
68 out = BIO_new_file("smencr.txt", "w");
72 /* Write out S/MIME message */
73 if (!SMIME_write_CMS(out, cms, in, flags))
81 fprintf(stderr, "Error Encrypting Data\n");
82 ERR_print_errors_fp(stderr);
85 CMS_ContentInfo_free(cms);
87 sk_X509_pop_free(recips, X509_free);