1/*
2 * Copyright 2008-2016 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 decryption example */
11#include <openssl/pem.h>
12#include <openssl/cms.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    CMS_ContentInfo *cms = 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 S/MIME message to decrypt */
42
43    in = BIO_new_file("smencr.txt", "r");
44
45    if (!in)
46        goto err;
47
48    /* Parse message */
49    cms = SMIME_read_CMS(in, NULL);
50
51    if (!cms)
52        goto err;
53
54    out = BIO_new_file("decout.txt", "w");
55    if (!out)
56        goto err;
57
58    /* Decrypt S/MIME message */
59    if (!CMS_decrypt(cms, rkey, rcert, NULL, out, 0))
60        goto err;
61
62    ret = 0;
63
64 err:
65
66    if (ret) {
67        fprintf(stderr, "Error Decrypting Data\n");
68        ERR_print_errors_fp(stderr);
69    }
70
71    CMS_ContentInfo_free(cms);
72    X509_free(rcert);
73    EVP_PKEY_free(rkey);
74    BIO_free(in);
75    BIO_free(out);
76    BIO_free(tbio);
77    return ret;
78}
79