1 /* Simple S/MIME compress example */
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;
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