openssl/demos/cms/cms_sign.c
James Muir 86db958835 demos: tidy up makefiles, fix warnings
Update makefiles so that consistent patterns are used.  Object files
are compiled from source using an implicit rule (but using our
CFLAGS); for linking, we give an explicit rule.  Ensure that "make
test" works in each subdirectory (even if it does not actually run any
applications).  The top-level demo makefile now works.

The makefiles are not make-agnostic.  e.g. they use the variable $(RM)
in "clean" recipes, which is defined in gnu-make but may not be
defined in others.

Part of #17806

Testing:

  $ cd demo
  $ make test

Reviewed-by: Paul Dale <pauli@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/22698)
2023-11-15 08:43:23 +01:00

90 lines
2.0 KiB
C

/*
* Copyright 2008-2023 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
/* 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 = EXIT_FAILURE;
/*
* 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);
if (BIO_reset(tbio) < 0)
goto err;
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)) {
if (BIO_reset(in) < 0)
goto err;
}
/* Write out S/MIME message */
if (!SMIME_write_CMS(out, cms, in, flags))
goto err;
ret = EXIT_SUCCESS;
err:
if (ret != EXIT_SUCCESS) {
fprintf(stderr, "Error Signing Data\n");
ERR_print_errors_fp(stderr);
}
CMS_ContentInfo_free(cms);
X509_free(scert);
EVP_PKEY_free(skey);
BIO_free(in);
BIO_free(out);
BIO_free(tbio);
return ret;
}