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 /* S/MIME signing example: 2 signers */
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 *scert = NULL, *scert2 = NULL;
19 EVP_PKEY *skey = NULL, *skey2 = NULL;
20 PKCS7 *p7 = NULL;
21 int ret = EXIT_FAILURE;
22
23 OpenSSL_add_all_algorithms();
24 ERR_load_crypto_strings();
25
26 tbio = BIO_new_file("signer.pem", "r");
27
28 if (!tbio)
29 goto err;
30
31 scert = PEM_read_bio_X509(tbio, NULL, 0, NULL);
32
33 if (BIO_reset(tbio) < 0)
34 goto err;
35
36 skey = PEM_read_bio_PrivateKey(tbio, NULL, 0, NULL);
37
38 BIO_free(tbio);
39
40 tbio = BIO_new_file("signer2.pem", "r");
41
42 if (!tbio)
43 goto err;
44
45 scert2 = PEM_read_bio_X509(tbio, NULL, 0, NULL);
46
47 if (BIO_reset(tbio) < 0)
48 goto err;
49
50 skey2 = PEM_read_bio_PrivateKey(tbio, NULL, 0, NULL);
51
52 if (!scert2 || !skey2)
53 goto err;
54
55 in = BIO_new_file("sign.txt", "r");
56
57 if (!in)
58 goto err;
59
60 p7 = PKCS7_sign(NULL, NULL, NULL, in, PKCS7_STREAM | PKCS7_PARTIAL);
61
62 if (!p7)
63 goto err;
64
65 /* Add each signer in turn */
66
67 if (!PKCS7_sign_add_signer(p7, scert, skey, NULL, 0))
68 goto err;
69
70 if (!PKCS7_sign_add_signer(p7, scert2, skey2, NULL, 0))
71 goto err;
72
73 out = BIO_new_file("smout.txt", "w");
74 if (!out)
75 goto err;
76
77 /* NB: content included and finalized by SMIME_write_PKCS7 */
78
79 if (!SMIME_write_PKCS7(out, p7, in, PKCS7_STREAM))
80 goto err;
81
82 printf("Success\n");
83
84 ret = EXIT_SUCCESS;
85 err:
86 if (ret != EXIT_SUCCESS) {
87 fprintf(stderr, "Error Signing Data\n");
88 ERR_print_errors_fp(stderr);
89 }
90 PKCS7_free(p7);
91 X509_free(scert);
92 EVP_PKEY_free(skey);
93 X509_free(scert2);
94 EVP_PKEY_free(skey2);
95 BIO_free(in);
96 BIO_free(out);
97 BIO_free(tbio);
98 return ret;
99 }
100
