1/*
2 * Copyright 2007-2016 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 encrypt 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    STACK_OF(X509) *recips = NULL;
20    PKCS7 *p7 = NULL;
21    int ret = 1;
22
23    /*
24     * On OpenSSL 0.9.9 only:
25     * for streaming set PKCS7_STREAM
26     */
27    int flags = PKCS7_STREAM;
28
29    OpenSSL_add_all_algorithms();
30    ERR_load_crypto_strings();
31
32    /* Read in recipient certificate */
33    tbio = BIO_new_file("signer.pem", "r");
34
35    if (!tbio)
36        goto err;
37
38    rcert = PEM_read_bio_X509(tbio, NULL, 0, NULL);
39
40    if (!rcert)
41        goto err;
42
43    /* Create recipient STACK and add recipient cert to it */
44    recips = sk_X509_new_null();
45
46    if (!recips || !sk_X509_push(recips, rcert))
47        goto err;
48
49    /*
50     * sk_X509_pop_free will free up recipient STACK and its contents so set
51     * rcert to NULL so it isn't freed up twice.
52     */
53    rcert = NULL;
54
55    /* Open content being encrypted */
56
57    in = BIO_new_file("encr.txt", "r");
58
59    if (!in)
60        goto err;
61
62    /* encrypt content */
63    p7 = PKCS7_encrypt(recips, in, EVP_des_ede3_cbc(), flags);
64
65    if (!p7)
66        goto err;
67
68    out = BIO_new_file("smencr.txt", "w");
69    if (!out)
70        goto err;
71
72    /* Write out S/MIME message */
73    if (!SMIME_write_PKCS7(out, p7, in, flags))
74        goto err;
75
76    ret = 0;
77
78 err:
79    if (ret) {
80        fprintf(stderr, "Error Encrypting Data\n");
81        ERR_print_errors_fp(stderr);
82    }
83    PKCS7_free(p7);
84    X509_free(rcert);
85    sk_X509_pop_free(recips, X509_free);
86    BIO_free(in);
87    BIO_free(out);
88    BIO_free(tbio);
89    return ret;
90
91}
92