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Commit | Line | Data |
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9e200689 | 1 | /* |
da1c088f | 2 | * Copyright 2008-2023 The OpenSSL Project Authors. All Rights Reserved. |
9e200689 | 3 | * |
5e73e6ba | 4 | * Licensed under the Apache License 2.0 (the "License"). You may not use |
9e200689 RS |
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 | ||
3b28bc99 DSH |
10 | /* Simple S/MIME signing example */ |
11 | #include <openssl/pem.h> | |
12 | #include <openssl/cms.h> | |
13 | #include <openssl/err.h> | |
14 | ||
15 | int main(int argc, char **argv) | |
0f113f3e MC |
16 | { |
17 | BIO *in = NULL, *out = NULL, *tbio = NULL; | |
18 | X509 *scert = NULL; | |
19 | EVP_PKEY *skey = NULL; | |
20 | CMS_ContentInfo *cms = NULL; | |
09ff84bd | 21 | int ret = EXIT_FAILURE; |
3b28bc99 | 22 | |
0f113f3e MC |
23 | /* |
24 | * For simple S/MIME signing use CMS_DETACHED. On OpenSSL 1.0.0 only: for | |
25 | * streaming detached set CMS_DETACHED|CMS_STREAM for streaming | |
26 | * non-detached set CMS_STREAM | |
27 | */ | |
28 | int flags = CMS_DETACHED | CMS_STREAM; | |
3b28bc99 | 29 | |
0f113f3e MC |
30 | OpenSSL_add_all_algorithms(); |
31 | ERR_load_crypto_strings(); | |
3b28bc99 | 32 | |
0f113f3e MC |
33 | /* Read in signer certificate and private key */ |
34 | tbio = BIO_new_file("signer.pem", "r"); | |
3b28bc99 | 35 | |
0f113f3e MC |
36 | if (!tbio) |
37 | goto err; | |
3b28bc99 | 38 | |
0f113f3e | 39 | scert = PEM_read_bio_X509(tbio, NULL, 0, NULL); |
3b28bc99 | 40 | |
0f113f3e | 41 | BIO_reset(tbio); |
3b28bc99 | 42 | |
0f113f3e | 43 | skey = PEM_read_bio_PrivateKey(tbio, NULL, 0, NULL); |
3b28bc99 | 44 | |
0f113f3e MC |
45 | if (!scert || !skey) |
46 | goto err; | |
3b28bc99 | 47 | |
0f113f3e | 48 | /* Open content being signed */ |
3b28bc99 | 49 | |
0f113f3e | 50 | in = BIO_new_file("sign.txt", "r"); |
3b28bc99 | 51 | |
0f113f3e MC |
52 | if (!in) |
53 | goto err; | |
3b28bc99 | 54 | |
0f113f3e MC |
55 | /* Sign content */ |
56 | cms = CMS_sign(scert, skey, NULL, in, flags); | |
3b28bc99 | 57 | |
0f113f3e MC |
58 | if (!cms) |
59 | goto err; | |
3b28bc99 | 60 | |
0f113f3e MC |
61 | out = BIO_new_file("smout.txt", "w"); |
62 | if (!out) | |
63 | goto err; | |
3b28bc99 | 64 | |
0f113f3e MC |
65 | if (!(flags & CMS_STREAM)) |
66 | BIO_reset(in); | |
3b28bc99 | 67 | |
0f113f3e MC |
68 | /* Write out S/MIME message */ |
69 | if (!SMIME_write_CMS(out, cms, in, flags)) | |
70 | goto err; | |
3b28bc99 | 71 | |
09ff84bd | 72 | ret = EXIT_SUCCESS; |
0f113f3e | 73 | err: |
09ff84bd | 74 | if (ret != EXIT_SUCCESS) { |
0f113f3e MC |
75 | fprintf(stderr, "Error Signing Data\n"); |
76 | ERR_print_errors_fp(stderr); | |
77 | } | |
3b28bc99 | 78 | |
25aaa98a | 79 | CMS_ContentInfo_free(cms); |
222561fe | 80 | X509_free(scert); |
c5ba2d99 | 81 | EVP_PKEY_free(skey); |
ca3a82c3 RS |
82 | BIO_free(in); |
83 | BIO_free(out); | |
84 | BIO_free(tbio); | |
0f113f3e | 85 | return ret; |
0f113f3e | 86 | } |