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/*
* OpenVPN -- An application to securely tunnel IP networks
* over a single UDP port, with support for SSL/TLS-based
* session authentication and key exchange,
* packet encryption, packet authentication, and
* packet compression.
*
* Copyright (C) 2023 Selva Nair <selva.nair@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by the
* Free Software Foundation, either version 2 of the License,
* or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "syshead.h"
#include "xkey_common.h"
#include <setjmp.h>
#include <cmocka.h>
#ifdef HAVE_XKEY_PROVIDER
#include <openssl/core_names.h>
#include <openssl/evp.h>
extern OSSL_LIB_CTX *tls_libctx;
/* A message for signing */
static const char *test_msg = "Lorem ipsum dolor sit amet, consectetur "
"adipisici elit, sed eiusmod tempor incidunt "
"ut labore et dolore magna aliqua.";
/**
* Sign "test_msg" using a private key. The key may be a "provided" key
* in which case its signed by the provider's backend -- cryptoapi in our
* case. Then verify the signature using OpenSSL.
* Returns 1 on success, 0 on error.
*/
int
digest_sign_verify(EVP_PKEY *privkey, EVP_PKEY *pubkey)
{
uint8_t *sig = NULL;
size_t siglen = 0;
int ret = 0;
OSSL_PARAM params[2] = {OSSL_PARAM_END};
const char *mdname = "SHA256";
if (EVP_PKEY_get_id(privkey) == EVP_PKEY_RSA)
{
const char *padmode = "pss"; /* RSA_PSS: for all other params, use defaults */
params[0] = OSSL_PARAM_construct_utf8_string(OSSL_SIGNATURE_PARAM_PAD_MODE,
(char *)padmode, 0);
params[1] = OSSL_PARAM_construct_end();
}
else if (EVP_PKEY_get_id(privkey) == EVP_PKEY_EC)
{
params[0] = OSSL_PARAM_construct_end();
}
else
{
print_error("Unknown key type in digest_sign_verify()");
return ret;
}
EVP_PKEY_CTX *pctx = NULL;
EVP_MD_CTX *mctx = EVP_MD_CTX_new();
if (!mctx
|| EVP_DigestSignInit_ex(mctx, &pctx, mdname, tls_libctx, NULL, privkey, params) <= 0)
{
/* cmocka assert output for these kinds of failures is hardly explanatory,
* print a message and assert in caller. */
print_error("Failed to initialize EVP_DigestSignInit_ex()\n");
goto done;
}
/* sign with sig = NULL to get required siglen */
if (EVP_DigestSign(mctx, sig, &siglen, (uint8_t *)test_msg, strlen(test_msg)) != 1)
{
print_error("EVP_DigestSign: failed to get required signature size");
goto done;
}
assert_true(siglen > 0);
if ((sig = test_calloc(1, siglen)) == NULL)
{
print_error("Out of memory");
goto done;
}
if (EVP_DigestSign(mctx, sig, &siglen, (uint8_t *)test_msg, strlen(test_msg)) != 1)
{
print_error("EVP_DigestSign: signing failed");
goto done;
}
/*
* Now validate the signature using OpenSSL. Just use the public key
* which is a native OpenSSL key.
*/
EVP_MD_CTX_free(mctx); /* this also frees pctx */
mctx = EVP_MD_CTX_new();
pctx = NULL;
if (!mctx
|| EVP_DigestVerifyInit_ex(mctx, &pctx, mdname, tls_libctx, NULL, pubkey, params) <= 0)
{
print_error("Failed to initialize EVP_DigestVerifyInit_ex()");
goto done;
}
if (EVP_DigestVerify(mctx, sig, siglen, (uint8_t *)test_msg, strlen(test_msg)) != 1)
{
print_error("EVP_DigestVerify failed");
goto done;
}
ret = 1;
done:
if (mctx)
{
EVP_MD_CTX_free(mctx); /* this also frees pctx */
}
test_free(sig);
return ret;
}
#endif /* HAVE_XKEY_PROVIDER */
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