mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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63 lines
2.2 KiB
C++
63 lines
2.2 KiB
C++
/*
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* Copyright (c) 2018-2019 Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include <switch.h>
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#include <stratosphere.hpp>
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#include <stratosphere/spl/spl_types.hpp>
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namespace sts::spl {
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/* Nintendo implements CTR_DRBG for their csrng. We will do the same. */
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class CtrDrbg {
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public:
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static constexpr size_t MaxRequestSize = 0x10000;
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static constexpr size_t ReseedInterval = 0x7FFFFFF0;
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static constexpr size_t BlockSize = AES_BLOCK_SIZE;
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static constexpr size_t SeedSize = 2 * AES_BLOCK_SIZE;
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private:
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Aes128Context aes_ctx;
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u8 counter[BlockSize];
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u8 key[BlockSize];
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u8 work[2][SeedSize];
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u32 reseed_counter;
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private:
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static void Xor(void *dst, const void *src, size_t size) {
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const u8 *src_u8 = reinterpret_cast<const u8 *>(src);
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u8 *dst_u8 = reinterpret_cast<u8 *>(dst);
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for (size_t i = 0; i < size; i++) {
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dst_u8[i] ^= src_u8[i];
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}
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}
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static void IncrementCounter(void *ctr) {
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u64 *ctr_64 = reinterpret_cast<u64 *>(ctr);
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ctr_64[1] = __builtin_bswap64(__builtin_bswap64(ctr_64[1]) + 1);
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if (!ctr_64[1]) {
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ctr_64[0] = __builtin_bswap64(__builtin_bswap64(ctr_64[0]) + 1);
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}
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}
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private:
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void Update(const void *data);
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public:
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void Initialize(const void *seed);
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void Reseed(const void *seed);
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bool GenerateRandomBytes(void *out, size_t size);
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};
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}
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