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https://github.com/Atmosphere-NX/Atmosphere-libs.git
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96 lines
3.4 KiB
C++
96 lines
3.4 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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#include <exosphere.hpp>
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namespace ams::crypto::impl {
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namespace {
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constexpr bool IsSupportedKeySize(size_t size) {
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return size == 16 || size == 24 || size == 32;
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}
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}
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template<size_t KeySize>
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AesImpl<KeySize>::~AesImpl() {
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ClearMemory(this, sizeof(*this));
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}
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template<size_t KeySize>
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void AesImpl<KeySize>::Initialize(const void *key, size_t key_size, bool is_encrypt) {
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static_assert(IsSupportedKeySize(KeySize));
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AMS_ASSERT(key_size == sizeof(int));
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AMS_UNUSED(key_size, is_encrypt);
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/* Set the security engine keyslot. */
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m_slot = *static_cast<const int *>(key);
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}
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template<size_t KeySize>
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void AesImpl<KeySize>::EncryptBlock(void *dst, size_t dst_size, const void *src, size_t src_size) const {
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static_assert(IsSupportedKeySize(KeySize));
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AMS_ASSERT(src_size >= BlockSize);
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AMS_ASSERT(dst_size >= BlockSize);
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if constexpr (KeySize == 16) {
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/* Aes 128. */
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se::EncryptAes128(dst, dst_size, m_slot, src, src_size);
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} else if constexpr (KeySize == 24) {
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/* Aes 192. */
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/* TODO: se::EncryptAes192(dst, dst_size, m_slot, src, src_size); */
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AMS_UNUSED(dst, dst_size, src, src_size);
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} else if constexpr (KeySize == 32) {
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/* Aes 256. */
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/* TODO: se::EncryptAes256(dst, dst_size, m_slot, src, src_size); */
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AMS_UNUSED(dst, dst_size, src, src_size);
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} else {
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/* Invalid key size. */
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static_assert(!std::is_same<AesImpl<KeySize>, AesImpl<KeySize>>::value);
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}
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}
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template<size_t KeySize>
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void AesImpl<KeySize>::DecryptBlock(void *dst, size_t dst_size, const void *src, size_t src_size) const {
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static_assert(IsSupportedKeySize(KeySize));
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AMS_ASSERT(src_size >= BlockSize);
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AMS_ASSERT(dst_size >= BlockSize);
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if constexpr (KeySize == 16) {
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/* Aes 128. */
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se::DecryptAes128(dst, dst_size, m_slot, src, src_size);
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} else if constexpr (KeySize == 24) {
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/* Aes 192. */
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/* TODO: se::DecryptAes192(dst, dst_size, m_slot, src, src_size); */
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AMS_UNUSED(dst, dst_size, src, src_size);
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} else if constexpr (KeySize == 32) {
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/* Aes 256. */
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/* TODO: se::DecryptAes256(dst, dst_size, m_slot, src, src_size); */
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AMS_UNUSED(dst, dst_size, src, src_size);
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} else {
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/* Invalid key size. */
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static_assert(!std::is_same<AesImpl<KeySize>, AesImpl<KeySize>>::value);
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}
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}
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/* Explicitly instantiate the three supported key sizes. */
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template class AesImpl<16>;
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template class AesImpl<24>;
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template class AesImpl<32>;
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}
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