1/* Simple S/MIME compress example */
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;
9    CMS_ContentInfo *cms = NULL;
10    int ret = 1;
11
12    /*
13     * On OpenSSL 1.0.0+ only:
14     * for streaming set CMS_STREAM
15     */
16    int flags = CMS_STREAM;
17
18    OpenSSL_add_all_algorithms();
19    ERR_load_crypto_strings();
20
21    /* Open content being compressed */
22
23    in = BIO_new_file("comp.txt", "r");
24
25    if (!in)
26        goto err;
27
28    /* compress content */
29    cms = CMS_compress(in, NID_zlib_compression, flags);
30
31    if (!cms)
32        goto err;
33
34    out = BIO_new_file("smcomp.txt", "w");
35    if (!out)
36        goto err;
37
38    /* Write out S/MIME message */
39    if (!SMIME_write_CMS(out, cms, in, flags))
40        goto err;
41
42    ret = 0;
43
44 err:
45
46    if (ret) {
47        fprintf(stderr, "Error Compressing Data\n");
48        ERR_print_errors_fp(stderr);
49    }
50
51    if (cms)
52        CMS_ContentInfo_free(cms);
53    if (in)
54        BIO_free(in);
55    if (out)
56        BIO_free(out);
57
58    return ret;
59
60}
61