aboutsummaryrefslogtreecommitdiff
path: root/openssl/demos/cms/cms_enc.c
blob: e8ecb48e277626117832e75ea96101b142e6aa74 (plain)
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;

}