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 verification 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, *cont = NULL;
X509_STORE *st = NULL;
X509 *cacert = NULL;
CMS_ContentInfo *cms = NULL;
int ret = 1;
/* Set up trusted CA certificate store */
st = X509_STORE_new();
/* Read in CA certificate */
tbio = BIO_new_file("cacert.pem", "r");
if (!tbio)
goto err;
cacert = PEM_read_bio_X509(tbio, NULL, 0, NULL);
if (!cacert)
goto err;
if (!X509_STORE_add_cert(st, cacert))
goto err;
/* Open message being verified */
in = BIO_new_file("smout.txt", "r");
if (!in)
goto err;
/* parse message */
cms = SMIME_read_CMS(in, &cont);
if (!cms)
goto err;
/* File to output verified content to */
out = BIO_new_file("smver.txt", "w");
if (!out)
goto err;
if (!CMS_verify(cms, NULL, st, cont, out, 0)) {
fprintf(stderr, "Verification Failure\n");
goto err;
fprintf(stderr, "Verification Successful\n");
ret = 0;
if (ret) {
fprintf(stderr, "Error Verifying Data\n");
return ret;