1/* S/MIME signing example: 2 signers */
2#include <openssl/pem.h>
3#include <openssl/cms.h>
4#include <openssl/err.h>
5
6int main(int argc, char **argv)
7{
8    BIO *in = NULL, *out = NULL, *tbio = NULL;
9    X509 *scert = NULL, *scert2 = NULL;
10    EVP_PKEY *skey = NULL, *skey2 = NULL;
11    CMS_ContentInfo *cms = NULL;
12    int ret = 1;
13
14    OpenSSL_add_all_algorithms();
15    ERR_load_crypto_strings();
16
17    tbio = BIO_new_file("signer.pem", "r");
18
19    if (!tbio)
20        goto err;
21
22    scert = PEM_read_bio_X509(tbio, NULL, 0, NULL);
23
24    BIO_reset(tbio);
25
26    skey = PEM_read_bio_PrivateKey(tbio, NULL, 0, NULL);
27
28    BIO_free(tbio);
29
30    tbio = BIO_new_file("signer2.pem", "r");
31
32    if (!tbio)
33        goto err;
34
35    scert2 = PEM_read_bio_X509(tbio, NULL, 0, NULL);
36
37    BIO_reset(tbio);
38
39    skey2 = PEM_read_bio_PrivateKey(tbio, NULL, 0, NULL);
40
41    if (!scert2 || !skey2)
42        goto err;
43
44    in = BIO_new_file("sign.txt", "r");
45
46    if (!in)
47        goto err;
48
49    cms = CMS_sign(NULL, NULL, NULL, in, CMS_STREAM | CMS_PARTIAL);
50
51    if (!cms)
52        goto err;
53
54    /* Add each signer in turn */
55
56    if (!CMS_add1_signer(cms, scert, skey, NULL, 0))
57        goto err;
58
59    if (!CMS_add1_signer(cms, scert2, skey2, NULL, 0))
60        goto err;
61
62    out = BIO_new_file("smout.txt", "w");
63    if (!out)
64        goto err;
65
66    /* NB: content included and finalized by SMIME_write_CMS */
67
68    if (!SMIME_write_CMS(out, cms, in, CMS_STREAM))
69        goto err;
70
71    ret = 0;
72
73 err:
74
75    if (ret) {
76        fprintf(stderr, "Error Signing Data\n");
77        ERR_print_errors_fp(stderr);
78    }
79
80    if (cms)
81        CMS_ContentInfo_free(cms);
82
83    if (scert)
84        X509_free(scert);
85    if (skey)
86        EVP_PKEY_free(skey);
87
88    if (scert2)
89        X509_free(scert2);
90    if (skey)
91        EVP_PKEY_free(skey2);
92
93    if (in)
94        BIO_free(in);
95    if (out)
96        BIO_free(out);
97    if (tbio)
98        BIO_free(tbio);
99
100    return ret;
101
102}
103