mirror of
https://github.com/Atmosphere-NX/Atmosphere
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72 lines
2.3 KiB
C++
72 lines
2.3 KiB
C++
/*
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* Copyright (c) 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 <vapours/common.hpp>
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#include <vapours/assert.hpp>
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#include <vapours/util.hpp>
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#include <vapours/crypto/impl/crypto_hash_function.hpp>
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#include <vapours/crypto/crypto_memory_clear.hpp>
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namespace ams::crypto {
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struct Sha256Context;
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}
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namespace ams::crypto::impl {
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class Sha256Impl {
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public:
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static constexpr size_t HashSize = 0x20;
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static constexpr size_t BlockSize = 0x40;
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private:
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struct State {
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u32 intermediate_hash[HashSize / sizeof(u32)];
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u8 buffer[BlockSize];
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u64 bits_consumed;
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size_t num_buffered;
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bool finalized;
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};
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private:
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State m_state;
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public:
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Sha256Impl() { m_state.finalized = false; }
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~Sha256Impl() {
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static_assert(std::is_trivially_destructible<State>::value);
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ClearMemory(std::addressof(m_state), sizeof(m_state));
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}
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void Initialize();
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void Update(const void *data, size_t size);
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void GetHash(void *dst, size_t size);
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void InitializeWithContext(const Sha256Context *context);
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size_t GetContext(Sha256Context *context) const;
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size_t GetBufferedDataSize() const { return m_state.num_buffered; }
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void GetBufferedData(void *dst, size_t dst_size) const {
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AMS_ASSERT(dst_size >= this->GetBufferedDataSize());
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AMS_UNUSED(dst_size);
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std::memcpy(dst, m_state.buffer, this->GetBufferedDataSize());
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}
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};
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static_assert(HashFunction<Sha256Impl>);
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}
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