2 * Copyright 2007-2023 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 /* Simple S/MIME encrypt example */
11 #include <openssl/pem.h>
12 #include <openssl/pkcs7.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;
21 int ret = EXIT_FAILURE;
24 * for streaming set PKCS7_STREAM
26 int flags = PKCS7_STREAM;
28 OpenSSL_add_all_algorithms();
29 ERR_load_crypto_strings();
31 /* Read in recipient certificate */
32 tbio = BIO_new_file("signer.pem", "r");
37 rcert = PEM_read_bio_X509(tbio, NULL, 0, NULL);
42 /* Create recipient STACK and add recipient cert to it */
43 recips = sk_X509_new_null();
45 if (!recips || !sk_X509_push(recips, rcert))
49 * OSSL_STACK_OF_X509_free() will free up recipient STACK and its contents
50 * so set rcert to NULL so it isn't freed up twice.
54 /* Open content being encrypted */
56 in = BIO_new_file("encr.txt", "r");
62 p7 = PKCS7_encrypt(recips, in, EVP_des_ede3_cbc(), flags);
67 out = BIO_new_file("smencr.txt", "w");
71 /* Write out S/MIME message */
72 if (!SMIME_write_PKCS7(out, p7, in, flags))
79 if (ret != EXIT_SUCCESS) {
80 fprintf(stderr, "Error Encrypting Data\n");
81 ERR_print_errors_fp(stderr);
85 OSSL_STACK_OF_X509_free(recips);