1 /*
2 * Copyright 2007-2016 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the OpenSSL license (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
main(int argc,char ** argv)15 int 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
31 /* Read in signer certificate and private key */
32 tbio = BIO_new_file("cacert.pem", "r");
33
34 if (!tbio)
35 goto err;
36
37 cacert = PEM_read_bio_X509(tbio, NULL, 0, NULL);
38
39 if (!cacert)
40 goto err;
41
42 if (!X509_STORE_add_cert(st, cacert))
43 goto err;
44
45 /* Open content being signed */
46
47 in = BIO_new_file("smout.txt", "r");
48
49 if (!in)
50 goto err;
51
52 /* Sign content */
53 p7 = SMIME_read_PKCS7(in, &cont);
54
55 if (!p7)
56 goto err;
57
58 /* File to output verified content to */
59 out = BIO_new_file("smver.txt", "w");
60 if (!out)
61 goto err;
62
63 if (!PKCS7_verify(p7, NULL, st, cont, out, 0)) {
64 fprintf(stderr, "Verification Failure\n");
65 goto err;
66 }
67
68 fprintf(stderr, "Verification Successful\n");
69
70 ret = 0;
71
72 err:
73 if (ret) {
74 fprintf(stderr, "Error Verifying Data\n");
75 ERR_print_errors_fp(stderr);
76 }
77 PKCS7_free(p7);
78 X509_free(cacert);
79 BIO_free(in);
80 BIO_free(out);
81 BIO_free(tbio);
82 return ret;
83 }
84