1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
|
/* Simple S/MIME encrypt example */
#include <openssl/pem.h>
#include <openssl/cms.h>
#include <openssl/err.h>
int main(int argc, char **argv)
{
BIO *in = NULL, *out = NULL, *tbio = NULL;
X509 *rcert = NULL;
STACK_OF(X509) *recips = NULL;
CMS_ContentInfo *cms = NULL;
int ret = 1;
/*
* On OpenSSL 1.0.0 and later only:
* for streaming set CMS_STREAM
*/
int flags = CMS_STREAM;
OpenSSL_add_all_algorithms();
ERR_load_crypto_strings();
/* Read in recipient certificate */
tbio = BIO_new_file("signer.pem", "r");
if (!tbio)
goto err;
rcert = PEM_read_bio_X509(tbio, NULL, 0, NULL);
if (!rcert)
goto err;
/* Create recipient STACK and add recipient cert to it */
recips = sk_X509_new_null();
if (!recips || !sk_X509_push(recips, rcert))
goto err;
/*
* sk_X509_pop_free will free up recipient STACK and its contents so set
* rcert to NULL so it isn't freed up twice.
*/
rcert = NULL;
/* Open content being encrypted */
in = BIO_new_file("encr.txt", "r");
if (!in)
goto err;
/* encrypt content */
cms = CMS_encrypt(recips, in, EVP_des_ede3_cbc(), flags);
if (!cms)
goto err;
out = BIO_new_file("smencr.txt", "w");
if (!out)
goto err;
/* Write out S/MIME message */
if (!SMIME_write_CMS(out, cms, in, flags))
goto err;
ret = 0;
err:
if (ret) {
fprintf(stderr, "Error Encrypting Data\n");
ERR_print_errors_fp(stderr);
}
if (cms)
CMS_ContentInfo_free(cms);
if (rcert)
X509_free(rcert);
if (recips)
sk_X509_pop_free(recips, X509_free);
if (in)
BIO_free(in);
if (out)
BIO_free(out);
if (tbio)
BIO_free(tbio);
return ret;
}
|
