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/* Simple S/MIME compress example */
#include <openssl/pem.h>
#include <openssl/cms.h>
#include <openssl/err.h>
int main(int argc, char **argv)
{
BIO *in = NULL, *out = NULL;
CMS_ContentInfo *cms = NULL;
int ret = 1;
/*
* On OpenSSL 1.0.0+ only:
* for streaming set CMS_STREAM
*/
int flags = CMS_STREAM;
OpenSSL_add_all_algorithms();
ERR_load_crypto_strings();
/* Open content being compressed */
in = BIO_new_file("comp.txt", "r");
if (!in)
goto err;
/* compress content */
cms = CMS_compress(in, NID_zlib_compression, flags);
if (!cms)
goto err;
out = BIO_new_file("smcomp.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 Compressing Data\n");
ERR_print_errors_fp(stderr);
}
if (cms)
CMS_ContentInfo_free(cms);
if (in)
BIO_free(in);
if (out)
BIO_free(out);
return ret;
}