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 encrypt 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;
18 X509 *rcert = NULL;
19 STACK_OF(X509) *recips = NULL;
20 PKCS7 *p7 = NULL;
21 int ret = EXIT_FAILURE;
22
23 /*
24 * for streaming set PKCS7_STREAM
25 */
26 int flags = PKCS7_STREAM;
27
28 OpenSSL_add_all_algorithms();
29 ERR_load_crypto_strings();
30
31 /* Read in recipient certificate */
32 tbio = BIO_new_file("signer.pem", "r");
33
34 if (!tbio)
35 goto err;
36
37 rcert = PEM_read_bio_X509(tbio, NULL, 0, NULL);
38
39 if (!rcert)
40 goto err;
41
42 /* Create recipient STACK and add recipient cert to it */
43 recips = sk_X509_new_null();
44
45 if (!recips || !sk_X509_push(recips, rcert))
46 goto err;
47
48 /*
49 * OSSL_STACK_OF_X509_free() will free up recipient STACK and its contents
50 * so set rcert to NULL so it isn't freed up twice.
51 */
52 rcert = NULL;
53
54 /* Open content being encrypted */
55
56 in = BIO_new_file("encr.txt", "r");
57
58 if (!in)
59 goto err;
60
61 /* encrypt content */
62 p7 = PKCS7_encrypt(recips, in, EVP_des_ede3_cbc(), flags);
63
64 if (!p7)
65 goto err;
66
67 out = BIO_new_file("smencr.txt", "w");
68 if (!out)
69 goto err;
70
71 /* Write out S/MIME message */
72 if (!SMIME_write_PKCS7(out, p7, in, flags))
73 goto err;
74
75 printf("Success\n");
76
77 ret = EXIT_SUCCESS;
78 err:
79 if (ret != EXIT_SUCCESS) {
80 fprintf(stderr, "Error Encrypting Data\n");
81 ERR_print_errors_fp(stderr);
82 }
83 PKCS7_free(p7);
84 X509_free(rcert);
85 OSSL_STACK_OF_X509_free(recips);
86 BIO_free(in);
87 BIO_free(out);
88 BIO_free(tbio);
89 return ret;
90 }
91
