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https://github.com/OpenVPN/openvpn3.git
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dde1574596
This is the result after running 'clang-format -i' on all C++ files and headers, with the defined formatting rules in .clang-format. Only the openvpn/common/unicode-impl.hpp has been excluded, as that is mostly a copy of an external project. Signed-off-by: David Sommerseth <davids@openvpn.net>
108 lines
3.3 KiB
C++
108 lines
3.3 KiB
C++
// OpenVPN -- An application to securely tunnel IP networks
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// over a single port, with support for SSL/TLS-based
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// session authentication and key exchange,
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// packet encryption, packet authentication, and
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// packet compression.
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//
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// Copyright (C) 2012-2022 OpenVPN Inc.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License Version 3
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// as published by the Free Software Foundation.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program in the COPYING file.
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// If not, see <http://www.gnu.org/licenses/>.
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#pragma once
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#include <openvpn/common/arch.hpp>
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#include <openvpn/common/size.hpp>
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#include <atomic>
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#if defined(USE_OPENSSL)
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#include <openssl/crypto.h>
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#endif
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// Does this architecture allow efficient unaligned access?
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#if defined(OPENVPN_ARCH_x86_64) || defined(OPENVPN_ARCH_i386)
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#define OPENVPN_HAVE_EFFICIENT_UNALIGNED_ACCESS
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#endif
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// Define a portable compiler memory access fence (from Boost).
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#if defined(__INTEL_COMPILER)
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#define OPENVPN_COMPILER_FENCE __memory_barrier();
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#elif defined(_MSC_VER) && _MSC_VER >= 1310
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extern "C" void _ReadWriteBarrier();
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#pragma intrinsic(_ReadWriteBarrier)
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#define OPENVPN_COMPILER_FENCE _ReadWriteBarrier();
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#elif defined(__GNUC__)
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#define OPENVPN_COMPILER_FENCE __asm__ __volatile__("" \
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: \
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: \
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: "memory");
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#else
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#error need memory fence definition for this compiler
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#endif
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// C++ doesn't allow increment of void *
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#define OPENVPN_INCR_VOID_PTR(var, incr) (var) = static_cast<const unsigned char *>(var) + (incr)
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namespace openvpn {
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namespace crypto {
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/**
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* memneq - Compare two areas of memory in constant time
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*
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* @a: first area of memory
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* @b: second area of memory
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* @size: The length of the memory area to compare
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*
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* Returns false when data is equal, true otherwise
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*/
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inline bool memneq(const void *a, const void *b, size_t size);
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#if defined(USE_OPENSSL)
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inline bool memneq(const void *a, const void *b, size_t size)
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{
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// memcmp does return 0 (=false) when the memory is equal. It normally
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// returns the position of first mismatch otherwise but the crypto
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// variants only promise to return something != 0 (=true)
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return (bool)(CRYPTO_memcmp(a, b, size));
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}
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#else
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inline bool memneq(const void *a, const void *b, size_t size)
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{
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// This is inspired by mbedtls' internal safer_memcmp function:
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const unsigned char *x = (const unsigned char *)a;
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const unsigned char *y = (const unsigned char *)b;
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unsigned char diff = 0;
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for (size_t i = 0; i < size; i++)
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{
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unsigned char u = x[i], v = y[i];
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diff |= u ^ v;
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}
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atomic_thread_fence(std::memory_order_release);
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return bool(diff);
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}
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#endif
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} // namespace crypto
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} // namespace openvpn
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