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/*
* Copyright (c) 2015, Secure Endpoints Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Windows fallback provider: decides whether to use hcrypto or
* wincng depending on whether bcrypt.dll is available (i.e. it
* is runtime compatible back to XP, but will use the native
* crypto APIs from Vista onwards).
*/
#include <config.h>
#include <roken.h>
#include <assert.h>
#include <evp.h>
#include <evp-w32.h>
#include <evp-hcrypto.h>
#include <evp-wincng.h>
static LONG wincng_available = -1;
static __inline int
wincng_check_availability(void)
{
if (wincng_available == -1) {
char szBCryptDllPath[MAX_PATH];
UINT cbBCryptDllPath;
cbBCryptDllPath = GetSystemDirectory(szBCryptDllPath,
sizeof(szBCryptDllPath));
if (cbBCryptDllPath > 0 &&
cbBCryptDllPath < sizeof(szBCryptDllPath) &&
strncat_s(szBCryptDllPath,
sizeof(szBCryptDllPath), "\\bcrypt.dll", 11) == 0) {
HANDLE hBCryptDll = LoadLibrary(szBCryptDllPath);
InterlockedCompareExchangeRelease(&wincng_available,
!!hBCryptDll, -1);
if (hBCryptDll)
FreeLibrary(hBCryptDll);
}
}
return wincng_available == 1;
}
BOOL WINAPI
_hc_w32crypto_DllMain(HINSTANCE hinstDLL,
DWORD fdwReason,
LPVOID lpvReserved)
{
if (fdwReason == DLL_PROCESS_DETACH) {
/*
* Don't bother cleaning up on process exit, only on
* FreeLibrary() (in which case lpvReserved will be NULL).
*/
if (lpvReserved == NULL)
_hc_wincng_cleanup();
}
return TRUE;
}
#define EVP_W32CRYPTO_PROVIDER(type, name) \
\
const type *hc_EVP_w32crypto_ ##name (void) \
{ \
if (wincng_check_availability()) \
return hc_EVP_wincng_ ##name (); \
else if (HCRYPTO_FALLBACK) \
return hc_EVP_hcrypto_ ##name (); \
else \
return NULL; \
}
#define EVP_W32CRYPTO_PROVIDER_CNG_UNAVAILABLE(type, name) \
\
const type *hc_EVP_w32crypto_ ##name (void) \
{ \
return hc_EVP_hcrypto_ ##name (); \
}
EVP_W32CRYPTO_PROVIDER(EVP_MD, md4)
EVP_W32CRYPTO_PROVIDER(EVP_MD, md5)
EVP_W32CRYPTO_PROVIDER(EVP_MD, sha1)
EVP_W32CRYPTO_PROVIDER(EVP_MD, sha256)
EVP_W32CRYPTO_PROVIDER(EVP_MD, sha384)
EVP_W32CRYPTO_PROVIDER(EVP_MD, sha512)
EVP_W32CRYPTO_PROVIDER(EVP_CIPHER, rc2_cbc)
EVP_W32CRYPTO_PROVIDER(EVP_CIPHER, rc2_40_cbc)
EVP_W32CRYPTO_PROVIDER(EVP_CIPHER, rc2_64_cbc)
EVP_W32CRYPTO_PROVIDER(EVP_CIPHER, rc4)
EVP_W32CRYPTO_PROVIDER(EVP_CIPHER, rc4_40)
EVP_W32CRYPTO_PROVIDER(EVP_CIPHER, des_cbc)
EVP_W32CRYPTO_PROVIDER(EVP_CIPHER, des_ede3_cbc)
EVP_W32CRYPTO_PROVIDER(EVP_CIPHER, aes_128_cbc)
EVP_W32CRYPTO_PROVIDER(EVP_CIPHER, aes_192_cbc)
EVP_W32CRYPTO_PROVIDER(EVP_CIPHER, aes_256_cbc)
EVP_W32CRYPTO_PROVIDER(EVP_CIPHER, aes_128_cfb8)
EVP_W32CRYPTO_PROVIDER(EVP_CIPHER, aes_192_cfb8)
EVP_W32CRYPTO_PROVIDER(EVP_CIPHER, aes_256_cfb8)
EVP_W32CRYPTO_PROVIDER_CNG_UNAVAILABLE(EVP_CIPHER, camellia_128_cbc)
EVP_W32CRYPTO_PROVIDER_CNG_UNAVAILABLE(EVP_CIPHER, camellia_192_cbc)
EVP_W32CRYPTO_PROVIDER_CNG_UNAVAILABLE(EVP_CIPHER, camellia_256_cbc)
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