1/*
2 * Copyright 2007-2016 The OpenSSL Project Authors. All Rights Reserved.
3 *
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
8 */
9
10/* Simple S/MIME verification example */
11#include <openssl/pem.h>
12#include <openssl/pkcs7.h>
13#include <openssl/err.h>
14
15int main(int argc, char **argv)
16{
17    BIO *in = NULL, *out = NULL, *tbio = NULL, *cont = NULL;
18    X509_STORE *st = NULL;
19    X509 *cacert = NULL;
20    PKCS7 *p7 = NULL;
21
22    int ret = 1;
23
24    OpenSSL_add_all_algorithms();
25    ERR_load_crypto_strings();
26
27    /* Set up trusted CA certificate store */
28
29    st = X509_STORE_new();
30    if (st == NULL)
31        goto err;
32
33    /* Read in signer certificate and private key */
34    tbio = BIO_new_file("cacert.pem", "r");
35
36    if (tbio == NULL)
37        goto err;
38
39    cacert = PEM_read_bio_X509(tbio, NULL, 0, NULL);
40
41    if (cacert == NULL)
42        goto err;
43
44    if (!X509_STORE_add_cert(st, cacert))
45        goto err;
46
47    /* Open content being signed */
48
49    in = BIO_new_file("smout.txt", "r");
50
51    if (in == NULL)
52        goto err;
53
54    /* Sign content */
55    p7 = SMIME_read_PKCS7(in, &cont);
56
57    if (p7 == NULL)
58        goto err;
59
60    /* File to output verified content to */
61    out = BIO_new_file("smver.txt", "w");
62    if (out == NULL)
63        goto err;
64
65    if (!PKCS7_verify(p7, NULL, st, cont, out, 0)) {
66        fprintf(stderr, "Verification Failure\n");
67        goto err;
68    }
69
70    fprintf(stderr, "Verification Successful\n");
71
72    ret = 0;
73
74 err:
75    if (ret) {
76        fprintf(stderr, "Error Verifying Data\n");
77        ERR_print_errors_fp(stderr);
78    }
79
80    X509_STORE_free(st);
81    PKCS7_free(p7);
82    X509_free(cacert);
83    BIO_free(in);
84    BIO_free(out);
85    BIO_free(tbio);
86    return ret;
87}
88