1 /* S/MIME signing example: 2 signers */
2 #include <openssl/pem.h>
3 #include <openssl/cms.h>
4 #include <openssl/err.h>
5
main(int argc,char ** argv)6 int 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