mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
synced 2024-11-26 22:02:15 +00:00
85 lines
2.8 KiB
C++
85 lines
2.8 KiB
C++
/*
|
|
* Copyright (c) 2018-2019 Atmosphère-NX
|
|
*
|
|
* 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/>.
|
|
*/
|
|
|
|
#include <switch.h>
|
|
#include <stratosphere.hpp>
|
|
#include <stratosphere/spl/spl_types.hpp>
|
|
|
|
#include "spl_ctr_drbg.hpp"
|
|
|
|
namespace sts::spl {
|
|
|
|
void CtrDrbg::Update(const void *data) {
|
|
aes128ContextCreate(&this->aes_ctx, this->key, true);
|
|
for (size_t offset = 0; offset < sizeof(this->work[1]); offset += BlockSize) {
|
|
IncrementCounter(this->counter);
|
|
aes128EncryptBlock(&this->aes_ctx, &this->work[1][offset], this->counter);
|
|
}
|
|
|
|
Xor(this->work[1], data, sizeof(this->work[1]));
|
|
|
|
std::memcpy(this->key, &this->work[1][0], sizeof(this->key));
|
|
std::memcpy(this->counter, &this->work[1][BlockSize], sizeof(this->key));
|
|
}
|
|
|
|
void CtrDrbg::Initialize(const void *seed) {
|
|
std::memcpy(this->work[0], seed, sizeof(this->work[0]));
|
|
std::memset(this->key, 0, sizeof(this->key));
|
|
std::memset(this->counter, 0, sizeof(this->counter));
|
|
this->Update(this->work[0]);
|
|
this->reseed_counter = 1;
|
|
}
|
|
|
|
void CtrDrbg::Reseed(const void *seed) {
|
|
std::memcpy(this->work[0], seed, sizeof(this->work[0]));
|
|
this->Update(this->work[0]);
|
|
this->reseed_counter = 1;
|
|
}
|
|
|
|
bool CtrDrbg::GenerateRandomBytes(void *out, size_t size) {
|
|
if (size > MaxRequestSize) {
|
|
return false;
|
|
}
|
|
|
|
if (this->reseed_counter > ReseedInterval) {
|
|
return false;
|
|
}
|
|
|
|
aes128ContextCreate(&this->aes_ctx, this->key, true);
|
|
u8 *cur_dst = reinterpret_cast<u8 *>(out);
|
|
|
|
size_t aligned_size = (size & ~(BlockSize - 1));
|
|
for (size_t offset = 0; offset < aligned_size; offset += BlockSize) {
|
|
IncrementCounter(this->counter);
|
|
aes128EncryptBlock(&this->aes_ctx, cur_dst, this->counter);
|
|
cur_dst += BlockSize;
|
|
}
|
|
|
|
if (size > aligned_size) {
|
|
IncrementCounter(this->counter);
|
|
aes128EncryptBlock(&this->aes_ctx, this->work[1], this->counter);
|
|
std::memcpy(cur_dst, this->work[1], size - aligned_size);
|
|
}
|
|
|
|
std::memset(this->work[0], 0, sizeof(this->work[0]));
|
|
this->Update(this->work[0]);
|
|
|
|
this->reseed_counter++;
|
|
return true;
|
|
|
|
}
|
|
|
|
}
|