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DiscIO: Parallelize the re-encryption code

This commit is contained in:
JosJuice 2020-01-25 14:03:11 +01:00
parent 319c508978
commit da9e0fb598
1 changed files with 108 additions and 59 deletions
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167
Source/Core/DiscIO/VolumeWii.cpp
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@ -8,16 +8,19 @@
#include <array>
#include <cstddef>
#include <cstring>
#include <future>
#include <map>
#include <memory>
#include <optional>
#include <string>
#include <thread>
#include <utility>
#include <vector>
#include <mbedtls/aes.h>
#include <mbedtls/sha1.h>
#include "Common/Align.h"
#include "Common/Assert.h"
#include "Common/CommonTypes.h"
#include "Common/Logging/Log.h"
@ -530,86 +533,132 @@ bool VolumeWii::EncryptGroup(u64 offset, u64 partition_data_offset,
std::array<u8, GROUP_TOTAL_SIZE>* out)
{
std::vector<std::array<u8, BLOCK_DATA_SIZE>> unencrypted_data(BLOCKS_PER_GROUP);
for (size_t i = 0; i < BLOCKS_PER_GROUP; ++i)
{
if (offset + (i + 1) * BLOCK_DATA_SIZE <= partition_data_decrypted_size)
{
if (!blob->ReadWiiDecrypted(offset + i * BLOCK_DATA_SIZE, BLOCK_DATA_SIZE,
unencrypted_data[i].data(), partition_data_offset))
{
return false;
}
}
else
{
unencrypted_data[i].fill(0);
}
}
std::vector<std::array<u8, BLOCK_HEADER_SIZE>> unencrypted_hashes(BLOCKS_PER_GROUP);
// H0 hashes
std::array<std::future<void>, BLOCKS_PER_GROUP> hash_futures;
bool error_occurred = false;
for (size_t i = 0; i < BLOCKS_PER_GROUP; ++i)
{
for (u32 j = 0; j < 31; ++j)
if (!error_occurred)
{
mbedtls_sha1_ret(unencrypted_data[i].data() + j * 0x400, 0x400,
unencrypted_hashes[i].data() + j * SHA1_SIZE);
if (offset + (i + 1) * BLOCK_DATA_SIZE <= partition_data_decrypted_size)
{
if (!blob->ReadWiiDecrypted(offset + i * BLOCK_DATA_SIZE, BLOCK_DATA_SIZE,
unencrypted_data[i].data(), partition_data_offset))
{
error_occurred = true;
}
}
else
{
unencrypted_data[i].fill(0);
}
}
std::memset(unencrypted_hashes[i].data() + 0x26C, 0, 0x14);
hash_futures[i] = std::async(std::launch::async, [&unencrypted_data, &unencrypted_hashes,
&hash_futures, error_occurred, i]() {
const size_t h1_base = Common::AlignDown(i, 8);
if (!error_occurred)
{
// H0 hashes
for (size_t j = 0; j < 31; ++j)
{
mbedtls_sha1_ret(unencrypted_data[i].data() + j * 0x400, 0x400,
unencrypted_hashes[i].data() + j * SHA1_SIZE);
}
// H0 padding
std::memset(unencrypted_hashes[i].data() + 0x26C, 0, 0x14);
// H1 hash
mbedtls_sha1_ret(unencrypted_hashes[i].data(), 0x26C,
unencrypted_hashes[h1_base].data() + 0x280 + (i - h1_base) * SHA1_SIZE);
}
if (i % 8 == 7)
{
for (size_t j = 0; j < 7; ++j)
hash_futures[h1_base + j].get();
if (!error_occurred)
{
// H1 padding
std::memset(unencrypted_hashes[h1_base].data() + 0x320, 0, 0x20);
// H1 copies
for (size_t j = 1; j < 8; ++j)
{
std::memcpy(unencrypted_hashes[h1_base + j].data() + 0x280,
unencrypted_hashes[h1_base].data() + 0x280, 0xC0);
}
// H2 hash
mbedtls_sha1_ret(unencrypted_hashes[h1_base].data() + 0x280, 0xA0,
unencrypted_hashes[0].data() + 0x340 + h1_base / 8 * SHA1_SIZE);
}
if (i == BLOCKS_PER_GROUP - 1)
{
for (size_t j = 0; j < 7; ++j)
hash_futures[j * 8 + 7].get();
if (!error_occurred)
{
// H2 padding
std::memset(unencrypted_hashes[0].data() + 0x3E0, 0, 0x20);
// H2 copies
for (size_t j = 1; j < BLOCKS_PER_GROUP; ++j)
{
std::memcpy(unencrypted_hashes[j].data() + 0x340,
unencrypted_hashes[0].data() + 0x340, 0xC0);
}
}
}
}
});
}
// H1 hashes
for (size_t i = 0; i < BLOCKS_PER_GROUP / 8; ++i)
{
for (u32 j = 0; j < 8; ++j)
{
mbedtls_sha1_ret(unencrypted_hashes[i * 8 + j].data(), 0x26C,
unencrypted_hashes[i * 8].data() + 0x280 + j * SHA1_SIZE);
}
// Wait for all the async tasks to finish
hash_futures.back().get();
std::memset(unencrypted_hashes[i * 8].data() + 0x320, 0, 0x20);
if (error_occurred)
return false;
for (u32 j = 1; j < 8; ++j)
{
std::memcpy(unencrypted_hashes[i * 8 + j].data() + 0x280,
unencrypted_hashes[i * 8].data() + 0x280, 0xC0);
}
}
const unsigned int threads =
std::min(BLOCKS_PER_GROUP, std::max<unsigned int>(1, std::thread::hardware_concurrency()));
// H2 hashes
{
for (u32 i = 0; i < BLOCKS_PER_GROUP / 8; ++i)
{
mbedtls_sha1_ret(unencrypted_hashes[i * 8].data() + 0x280, 0xA0,
unencrypted_hashes[0].data() + 0x340 + i * SHA1_SIZE);
}
std::memset(unencrypted_hashes[0].data() + 0x3E0, 0, 0x20);
for (size_t i = 1; i < BLOCKS_PER_GROUP; ++i)
std::memcpy(unencrypted_hashes[i].data() + 0x340, unencrypted_hashes[0].data() + 0x340, 0xC0);
}
std::vector<std::future<void>> encryption_futures(threads);
mbedtls_aes_context aes_context;
mbedtls_aes_setkey_enc(&aes_context, key.data(), 128);
// Encryption
for (size_t i = 0; i < BLOCKS_PER_GROUP; ++i)
for (size_t i = 0; i < threads; ++i)
{
u8* out_ptr = out->data() + i * BLOCK_TOTAL_SIZE;
encryption_futures[i] = std::async(
std::launch::async,
[&unencrypted_data, &unencrypted_hashes, &aes_context, &out](size_t start, size_t end) {
for (size_t i = start; i < end; ++i)
{
u8* out_ptr = out->data() + i * BLOCK_TOTAL_SIZE;
u8 iv[16] = {};
mbedtls_aes_crypt_cbc(&aes_context, MBEDTLS_AES_ENCRYPT, BLOCK_HEADER_SIZE, iv,
unencrypted_hashes[i].data(), out_ptr);
u8 iv[16] = {};
mbedtls_aes_crypt_cbc(&aes_context, MBEDTLS_AES_ENCRYPT, BLOCK_HEADER_SIZE, iv,
unencrypted_hashes[i].data(), out_ptr);
std::memcpy(iv, out_ptr + 0x3D0, sizeof(iv));
mbedtls_aes_crypt_cbc(&aes_context, MBEDTLS_AES_ENCRYPT, BLOCK_DATA_SIZE, iv,
unencrypted_data[i].data(), out_ptr + BLOCK_HEADER_SIZE);
std::memcpy(iv, out_ptr + 0x3D0, sizeof(iv));
mbedtls_aes_crypt_cbc(&aes_context, MBEDTLS_AES_ENCRYPT, BLOCK_DATA_SIZE, iv,
unencrypted_data[i].data(), out_ptr + BLOCK_HEADER_SIZE);
}
},
i * BLOCKS_PER_GROUP / threads, (i + 1) * BLOCKS_PER_GROUP / threads);
}
for (std::future<void>& future : encryption_futures)
future.get();
return true;
}