smver.c
1.77 KB
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/*
* Copyright 2007-2016 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (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/pkcs7.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;
PKCS7 *p7 = NULL;
int ret = 1;
OpenSSL_add_all_algorithms();
ERR_load_crypto_strings();
/* Set up trusted CA certificate store */
st = X509_STORE_new();
/* Read in signer certificate and private key */
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 content being signed */
in = BIO_new_file("smout.txt", "r");
if (!in)
goto err;
/* Sign content */
p7 = SMIME_read_PKCS7(in, &cont);
if (!p7)
goto err;
/* File to output verified content to */
out = BIO_new_file("smver.txt", "w");
if (!out)
goto err;
if (!PKCS7_verify(p7, NULL, st, cont, out, 0)) {
fprintf(stderr, "Verification Failure\n");
goto err;
}
fprintf(stderr, "Verification Successful\n");
ret = 0;
err:
if (ret) {
fprintf(stderr, "Error Verifying Data\n");
ERR_print_errors_fp(stderr);
}
PKCS7_free(p7);
X509_free(cacert);
BIO_free(in);
BIO_free(out);
BIO_free(tbio);
return ret;
}