89 lines
1.5 KiB
C
89 lines
1.5 KiB
C
/* Simple S/MIME signing 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 *scert = NULL;
|
|
EVP_PKEY *skey = NULL;
|
|
CMS_ContentInfo *cms = NULL;
|
|
int ret = 1;
|
|
|
|
/* For simple S/MIME signing use CMS_DETACHED.
|
|
* On OpenSSL 1.0.0 only:
|
|
* for streaming detached set CMS_DETACHED|CMS_STREAM
|
|
* for streaming non-detached set CMS_STREAM
|
|
*/
|
|
int flags = CMS_DETACHED|CMS_STREAM;
|
|
|
|
OpenSSL_add_all_algorithms();
|
|
ERR_load_crypto_strings();
|
|
|
|
/* Read in signer certificate and private key */
|
|
tbio = BIO_new_file("signer.pem", "r");
|
|
|
|
if (!tbio)
|
|
goto err;
|
|
|
|
scert = PEM_read_bio_X509(tbio, NULL, 0, NULL);
|
|
|
|
BIO_reset(tbio);
|
|
|
|
skey = PEM_read_bio_PrivateKey(tbio, NULL, 0, NULL);
|
|
|
|
if (!scert || !skey)
|
|
goto err;
|
|
|
|
/* Open content being signed */
|
|
|
|
in = BIO_new_file("sign.txt", "r");
|
|
|
|
if (!in)
|
|
goto err;
|
|
|
|
/* Sign content */
|
|
cms = CMS_sign(scert, skey, NULL, in, flags);
|
|
|
|
if (!cms)
|
|
goto err;
|
|
|
|
out = BIO_new_file("smout.txt", "w");
|
|
if (!out)
|
|
goto err;
|
|
|
|
if (!(flags & CMS_STREAM))
|
|
BIO_reset(in);
|
|
|
|
/* Write out S/MIME message */
|
|
if (!SMIME_write_CMS(out, cms, in, flags))
|
|
goto err;
|
|
|
|
ret = 0;
|
|
|
|
err:
|
|
|
|
if (ret)
|
|
{
|
|
fprintf(stderr, "Error Signing Data\n");
|
|
ERR_print_errors_fp(stderr);
|
|
}
|
|
|
|
if (cms)
|
|
CMS_ContentInfo_free(cms);
|
|
if (scert)
|
|
X509_free(scert);
|
|
if (skey)
|
|
EVP_PKEY_free(skey);
|
|
|
|
if (in)
|
|
BIO_free(in);
|
|
if (out)
|
|
BIO_free(out);
|
|
if (tbio)
|
|
BIO_free(tbio);
|
|
|
|
return ret;
|
|
|
|
}
|