xref: /openssl/demos/smime/smver.c (revision 86db9588)
1 /*
2  * Copyright 2007-2023 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 
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     int ret = EXIT_FAILURE;
22 
23     OpenSSL_add_all_algorithms();
24     ERR_load_crypto_strings();
25 
26     /* Set up trusted CA certificate store */
27 
28     st = X509_STORE_new();
29     if (st == NULL)
30         goto err;
31 
32     /* Read in signer certificate and private key */
33     tbio = BIO_new_file("cacert.pem", "r");
34 
35     if (tbio == NULL)
36         goto err;
37 
38     cacert = PEM_read_bio_X509(tbio, NULL, 0, NULL);
39 
40     if (cacert == NULL)
41         goto err;
42 
43     if (!X509_STORE_add_cert(st, cacert))
44         goto err;
45 
46     /* Open content being signed */
47 
48     in = BIO_new_file("smout.txt", "r");
49 
50     if (in == NULL)
51         goto err;
52 
53     /* Sign content */
54     p7 = SMIME_read_PKCS7(in, &cont);
55 
56     if (p7 == NULL)
57         goto err;
58 
59     /* File to output verified content to */
60     out = BIO_new_file("smver.txt", "w");
61     if (out == NULL)
62         goto err;
63 
64     if (!PKCS7_verify(p7, NULL, st, cont, out, 0)) {
65         fprintf(stderr, "Verification Failure\n");
66         goto err;
67     }
68 
69     printf("Verification Successful\n");
70 
71     ret = EXIT_SUCCESS;
72  err:
73     if (ret != EXIT_SUCCESS) {
74         fprintf(stderr, "Error Verifying Data\n");
75         ERR_print_errors_fp(stderr);
76     }
77 
78     X509_STORE_free(st);
79     PKCS7_free(p7);
80     X509_free(cacert);
81     BIO_free(in);
82     BIO_free(out);
83     BIO_free(tbio);
84     return ret;
85 }
86