mirror of
https://github.com/Atmosphere-NX/Atmosphere
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126 lines
4.5 KiB
C++
126 lines
4.5 KiB
C++
/*
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* Copyright (c) 2018-2020 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::impl {
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template<typename Hash> /* requires HashFunction<Hash> */
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class HmacImpl {
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NON_COPYABLE(HmacImpl);
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NON_MOVEABLE(HmacImpl);
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public:
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static constexpr size_t MacSize = Hash::HashSize;
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static constexpr size_t BlockSize = Hash::BlockSize;
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private:
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static constexpr u32 IpadMagic = 0x36363636;
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static constexpr u32 OpadMagic = 0x5c5c5c5c;
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static constexpr u32 IpadMagicXorOpadMagic = IpadMagic ^ OpadMagic;
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static_assert(IpadMagicXorOpadMagic == 0x6a6a6a6a);
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private:
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enum State {
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State_None = 0,
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State_Initialized = 1,
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State_Done = 2,
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};
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private:
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Hash hash_function;
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u32 key[BlockSize / sizeof(u32)];
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u32 mac[MacSize / sizeof(u32)];
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State state;
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public:
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HmacImpl() : state(State_None) { /* ... */ }
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~HmacImpl() {
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static_assert(offsetof(HmacImpl, hash_function) == 0);
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/* Clear everything except for the hash function. */
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ClearMemory(reinterpret_cast<u8 *>(this) + sizeof(this->hash_function), sizeof(*this) - sizeof(this->hash_function));
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}
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void Initialize(const void *key, size_t key_size);
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void Update(const void *data, size_t data_size);
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void GetMac(void *dst, size_t dst_size);
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};
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template<typename Hash>
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inline void HmacImpl<Hash>::Initialize(const void *key, size_t key_size) {
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/* Clear the key storage. */
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std::memset(this->key, 0, sizeof(this->key));
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/* Set the key storage. */
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if (key_size > BlockSize) {
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this->hash_function.Initialize();
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this->hash_function.Update(key, key_size);
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this->hash_function.GetHash(this->key, this->hash_function.HashSize);
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} else {
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std::memcpy(this->key, key, key_size);
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}
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/* Xor the key with the ipad. */
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for (size_t i = 0; i < util::size(this->key); i++) {
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this->key[i] ^= IpadMagic;
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}
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/* Update the hash function with the xor'd key. */
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this->hash_function.Initialize();
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this->hash_function.Update(this->key, BlockSize);
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/* Mark initialized. */
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this->state = State_Initialized;
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}
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template<typename Hash>
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inline void HmacImpl<Hash>::Update(const void *data, size_t data_size) {
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AMS_ASSERT(this->state == State_Initialized);
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this->hash_function.Update(data, data_size);
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}
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template<typename Hash>
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inline void HmacImpl<Hash>::GetMac(void *dst, size_t dst_size) {
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AMS_ASSERT(this->state == State_Initialized || this->state == State_Done);
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AMS_ASSERT(dst_size >= MacSize);
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/* If we're not already finalized, get the final mac. */
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if (this->state == State_Initialized) {
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/* Get the hash of ((key ^ ipad) || data). */
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this->hash_function.GetHash(this->mac, MacSize);
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/* Xor the key with the opad. */
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for (size_t i = 0; i < util::size(this->key); i++) {
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this->key[i] ^= IpadMagicXorOpadMagic;
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}
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/* Calculate the final mac as hash of ((key ^ opad) || hash((key ^ ipad) || data)) */
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this->hash_function.Initialize();
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this->hash_function.Update(this->key, BlockSize);
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this->hash_function.Update(this->mac, MacSize);
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this->hash_function.GetHash(this->mac, MacSize);
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/* Set our state as done. */
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this->state = State_Done;
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}
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std::memcpy(dst, this->mac, MacSize);
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}
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}
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