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Atmosphere/libraries/libvapours/source/crypto/crypto_memory_compare.arch.generic.cpp

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/*
* Copyright (c) Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>.
*/
#include <vapours.hpp>
namespace ams::crypto {
bool IsSameBytes(const void *lhs, const void *rhs, size_t size) {
/* TODO: Should the generic impl be constant time? */
volatile u8 diff = 0;
const volatile u8 *lhs8 = static_cast<const volatile u8 *>(lhs);
const volatile u8 *rhs8 = static_cast<const volatile u8 *>(rhs);
for (size_t i = 0; i < size; ++i) {
diff = diff | (lhs8[i] ^ rhs8[i]);
}
return diff == 0;
}
}