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
