Atmosphere/libraries/libvapours/include/vapours/crypto/impl/crypto_sha256_impl.hpp

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