A local copy of OpenSSL from GitHub
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* Copyright 2008-2016 The OpenSSL Project Authors. All Rights Reserved.
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
/* Simple S/MIME encrypt example */
#include <openssl/pem.h>
#include <openssl/cms.h>
#include <openssl/err.h>
int main(int argc, char **argv)
BIO *in = NULL, *out = NULL, *tbio = NULL;
X509 *rcert = NULL;
STACK_OF(X509) *recips = NULL;
CMS_ContentInfo *cms = NULL;
int ret = 1;
* On OpenSSL 1.0.0 and later only:
* for streaming set CMS_STREAM
int flags = CMS_STREAM;
/* Read in recipient certificate */
tbio = BIO_new_file("signer.pem", "r");
if (!tbio)
goto err;
rcert = PEM_read_bio_X509(tbio, NULL, 0, NULL);
if (!rcert)
goto err;
/* Create recipient STACK and add recipient cert to it */
recips = sk_X509_new_null();
if (!recips || !sk_X509_push(recips, rcert))
goto err;
* sk_X509_pop_free will free up recipient STACK and its contents so set
* rcert to NULL so it isn't freed up twice.
rcert = NULL;
/* Open content being encrypted */
in = BIO_new_file("encr.txt", "r");
if (!in)
goto err;
/* encrypt content */
cms = CMS_encrypt(recips, in, EVP_des_ede3_cbc(), flags);
if (!cms)
goto err;
out = BIO_new_file("smencr.txt", "w");
if (!out)
goto err;
/* Write out S/MIME message */
if (!SMIME_write_CMS(out, cms, in, flags))
goto err;
ret = 0;
if (ret) {
fprintf(stderr, "Error Encrypting Data\n");
sk_X509_pop_free(recips, X509_free);
return ret;