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 signing 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;
18    X509 *rcert = NULL;
19    EVP_PKEY *rkey = NULL;
20    PKCS7 *p7 = NULL;
21    int ret = 1;
22
23    OpenSSL_add_all_algorithms();
24    ERR_load_crypto_strings();
25
26    /* Read in recipient certificate and private key */
27    tbio = BIO_new_file("signer.pem", "r");
28
29    if (!tbio)
30        goto err;
31
32    rcert = PEM_read_bio_X509(tbio, NULL, 0, NULL);
33
34    BIO_reset(tbio);
35
36    rkey = PEM_read_bio_PrivateKey(tbio, NULL, 0, NULL);
37
38    if (!rcert || !rkey)
39        goto err;
40
41    /* Open content being signed */
42
43    in = BIO_new_file("smencr.txt", "r");
44
45    if (!in)
46        goto err;
47
48    /* Sign content */
49    p7 = SMIME_read_PKCS7(in, NULL);
50
51    if (!p7)
52        goto err;
53
54    out = BIO_new_file("encrout.txt", "w");
55    if (!out)
56        goto err;
57
58    /* Decrypt S/MIME message */
59    if (!PKCS7_decrypt(p7, rkey, rcert, out, 0))
60        goto err;
61
62    ret = 0;
63
64 err:
65    if (ret) {
66        fprintf(stderr, "Error Signing Data\n");
67        ERR_print_errors_fp(stderr);
68    }
69    PKCS7_free(p7);
70    X509_free(rcert);
71    EVP_PKEY_free(rkey);
72    BIO_free(in);
73    BIO_free(out);
74    BIO_free(tbio);
75
76    return ret;
77
78}
79