mirror of
https://github.com/Decscots/Lockpick_RCM.git
synced 2024-11-01 05:25:07 +01:00
Sector -> cluster cache, optimize _gf256_mul_x_le
This commit is contained in:
parent
1881583eea
commit
4425e81085
@ -51,9 +51,9 @@
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extern hekate_config h_cfg;
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extern bool clear_sector_cache;
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extern bool lock_sector_cache;
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extern u32 secindex;
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extern bool clear_cluster_cache;
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extern bool lock_cluster_cache;
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extern u32 cluster_cache_index;
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u32 _key_count = 0, _titlekey_count = 0;
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u32 color_idx = 0;
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@ -593,6 +593,7 @@ pkg2_done:
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}
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path[25] = '/';
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lock_cluster_cache = true;
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while (!f_readdir(&dir, &fno) && fno.fname[0] && titles_found < title_limit) {
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minerva_periodic_training();
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memcpy(path + 26, fno.fname, 36);
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@ -614,7 +615,6 @@ pkg2_done:
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}
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hash_index = 0;
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// decrypt only what is needed to locate needed keys
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lock_sector_cache = true;
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temp_file = (u8*)_nca_process(5, 4, &fp, pkg1_id->key_info.es_offset, 0xc0, key_area_key);
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for (u32 i = 0; i <= 0xb0; ) {
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se_calc_sha256(temp_hash, temp_file + i, 0x10);
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@ -631,9 +631,7 @@ pkg2_done:
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free(temp_file);
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temp_file = NULL;
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titles_found++;
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lock_sector_cache = false;
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} else if (_read_le_u32(dec_header, 0x210) == 0x24 && dec_header[0x205] == 0) {
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lock_sector_cache = true;
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temp_file = (u8*)_nca_process(5, 4, &fp, pkg1_id->key_info.ssl_offset, 0x70, key_area_key);
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for (u32 i = 0; i <= 0x60; i++) {
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se_calc_sha256(temp_hash, temp_file + i, 0x10);
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@ -653,12 +651,12 @@ pkg2_done:
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free(temp_file);
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temp_file = NULL;
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titles_found++;
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lock_sector_cache = false;
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}
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f_close(&fp);
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}
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f_closedir(&dir);
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free(dec_header);
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lock_cluster_cache = false;
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// derive eticket_rsa_kek and ssl_rsa_kek
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if (_key_exists(es_keys[0]) && _key_exists(es_keys[1]) && _key_exists(master_key[0])) {
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@ -799,7 +797,7 @@ get_titlekeys:
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save_ctx->file = &fp;
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save_ctx->tool_ctx.action = 0;
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memcpy(save_ctx->save_mac_key, save_mac_key, 0x10);
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clear_sector_cache = true;
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clear_cluster_cache = true;
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save_process_success = save_process(save_ctx);
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if (!save_process_success) {
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EPRINTF("Failed to process e1 save.");
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@ -876,7 +874,7 @@ get_titlekeys:
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save_ctx->file = &fp;
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save_ctx->tool_ctx.action = 0;
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memcpy(save_ctx->save_mac_key, save_mac_key, 0x10);
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clear_sector_cache = true;
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clear_cluster_cache = true;
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save_process_success = save_process(save_ctx);
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if (!save_process_success) {
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EPRINTF("Failed to process e2 save.");
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@ -958,7 +956,7 @@ dismount:;
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free(save_ctx);
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}
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f_mount(NULL, "emmc:", 1);
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clear_sector_cache = true;
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clear_cluster_cache = true;
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nx_emmc_gpt_free(&gpt);
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key_output: ;
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@ -37,19 +37,26 @@ extern sdmmc_storage_t sd_storage;
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extern sdmmc_storage_t storage;
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extern emmc_part_t *system_part;
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typedef struct {
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u32 sector;
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u32 visit_count;
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u8 align[8];
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u8 tweak[0x10];
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u8 cached_sector[0x200];
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} sector_cache_t;
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#define MAX_CLUSTER_CACHE_ENTRIES 128
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#define CLUSTER_LOOKUP_EMPTY_ENTRY 0xFFFFFFFF
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#define XTS_CLUSTER_SIZE 0x4000
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#define SECTORS_PER_CLUSTER 0x20
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#define MAX_SEC_CACHE_ENTRIES 256
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static sector_cache_t *sector_cache = (sector_cache_t *)(MIXD_BUF_ALIGNED + 0x100000); //NULL;
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u32 secindex = 0;
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bool clear_sector_cache = false;
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bool lock_sector_cache = false;
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typedef struct {
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u32 cluster_num; // index of the cluster in the partition
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u32 visit_count; // used for debugging/access analysis
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u8 dirty; // has been modified without writeback flag
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u8 align[7];
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u8 cluster[XTS_CLUSTER_SIZE]; // the cached cluster itself
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} cluster_cache_t;
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static cluster_cache_t *cluster_cache = (cluster_cache_t *)RAM_DISK_ADDR;
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u32 cluster_cache_index = 0;
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u32 *cluster_lookup = (u32 *)(RAM_DISK_ADDR + MAX_CLUSTER_CACHE_ENTRIES * sizeof(cluster_cache_t));
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u8 *emmc_buffer = (u8 *)(MIXD_BUF_ALIGNED + 0x100000);
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bool clear_cluster_cache = false;
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bool lock_cluster_cache = false;
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DSTATUS disk_status (
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BYTE pdrv /* Physical drive number to identify the drive */
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@ -65,21 +72,23 @@ DSTATUS disk_initialize (
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return 0;
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}
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static inline void _gf256_mul_x_le(void *block) {
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u8 *pdata = (u8 *)block;
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static inline void _gf256_mul_x_le(void *block)
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{
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u32 *pdata = (u32 *)block;
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u32 carry = 0;
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for (u32 i = 0; i < 0x10; i++) {
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u8 b = pdata[i];
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for (u32 i = 0; i < 4; i++) {
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u32 b = pdata[i];
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pdata[i] = (b << 1) | carry;
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carry = b >> 7;
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carry = b >> 31;
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}
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if (carry)
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pdata[0x0] ^= 0x87;
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}
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static inline int _emmc_xts(u32 ks1, u32 ks2, u32 enc, u8 *tweak, bool regen_tweak, u32 tweak_exp, u64 sec, void *dst, void *src, u32 secsize) {
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static inline int _emmc_xts(u32 ks1, u32 ks2, u32 enc, u8 *tweak, bool regen_tweak, u32 tweak_exp, u64 sec, void *dst, void *src, u32 secsize)
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{
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int res = 0;
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u8 *temptweak = (u8 *)malloc(0x10);
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u32 *pdst = (u32 *)dst;
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@ -95,26 +104,33 @@ static inline int _emmc_xts(u32 ks1, u32 ks2, u32 enc, u8 *tweak, bool regen_twe
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goto out;
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}
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for (u32 i = 0; i < tweak_exp * 0x20; i++)
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// tweak_exp allows us to use a saved tweak to reduce _gf256_mul_x_le calls
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for (u32 i = 0; i < tweak_exp * SECTORS_PER_CLUSTER; i++)
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_gf256_mul_x_le(tweak);
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memcpy(temptweak, tweak, 0x10);
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//We are assuming a 0x10-aligned sector size in this implementation.
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for (u32 i = 0; i < secsize / 0x10; i++) {
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// The reference implementation in IEEE P1619 encrypts once per AES block
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// In this environment, doing so produces a lot of overhead
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// Instead, we perform one single AES-ECB operation between the sector xors
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// We are assuming a 0x10-aligned sector size in this implementation.
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for (u32 i = 0; i < secsize / 0x10; i++)
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{
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for (u32 j = 0; j < 4; j++)
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pdst[j] = psrc[j] ^ ptweak[j];
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_gf256_mul_x_le(tweak);
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psrc += 4;
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pdst += 4;
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}
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se_aes_crypt_ecb(ks2, enc, dst, secsize, dst, secsize);
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pdst = (u32 *)dst;
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memcpy(tweak, temptweak, 0x10);
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for (u32 i = 0; i < secsize / 0x10; i++) {
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for (u32 i = 0; i < secsize / 0x10; i++)
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{
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for (u32 j = 0; j < 4; j++)
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pdst[j] = pdst[j] ^ ptweak[j];
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_gf256_mul_x_le(tweak);
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@ -138,74 +154,87 @@ DRESULT disk_read (
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switch (pdrv)
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{
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case 0:
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if (((u32)buff >= DRAM_START) && !((u32)buff % 8))
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return sdmmc_storage_read(&sd_storage, sector, count, buff) ? RES_OK : RES_ERROR;
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u8 *buf = (u8 *)SDMMC_UPPER_BUFFER;
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if (sdmmc_storage_read(&sd_storage, sector, count, buf))
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{
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memcpy(buff, buf, 512 * count);
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return RES_OK;
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}
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return RES_ERROR;
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return sdmmc_storage_read(&sd_storage, sector, count, buff) ? RES_OK : RES_ERROR;
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case 1:;
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__attribute__ ((aligned (16))) static u8 tweak[0x10];
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__attribute__ ((aligned (16))) static u64 prev_cluster = -1;
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__attribute__ ((aligned (16))) static u32 prev_sector = 0;
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bool needs_cache_sector = false;
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if (secindex == 0 || clear_sector_cache) {
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clear_sector_cache = false;
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lock_sector_cache = false;
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secindex = 0;
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if (cluster_cache_index == 0 || clear_cluster_cache)
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{
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// memset gets optimized out...
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// for (u32 i = 0; i < (system_part->lba_end - system_part->lba_start + 1) / SECTORS_PER_CLUSTER; i++)
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// cluster_lookup[i] = CLUSTER_LOOKUP_EMPTY_ENTRY;
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memset(cluster_lookup, -1, (system_part->lba_end - system_part->lba_start + 1) / SECTORS_PER_CLUSTER * 4);
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cluster_cache_index = 0;
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clear_cluster_cache = false;
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lock_cluster_cache = false;
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}
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u32 s = 0;
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// only attempt to cache single-sector reads as these are most likely to be repeated (eg. rereading FAT)
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if (!lock_sector_cache && count == 1) {
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for ( ; s < secindex; s++) {
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if (sector_cache[s].sector == sector) {
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sector_cache[s].visit_count++;
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memcpy(buff, sector_cache[s].cached_sector, 0x200);
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memcpy(tweak, sector_cache[s].tweak, 0x10);
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prev_sector = sector;
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prev_cluster = sector / 0x20;
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return RES_OK;
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}
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}
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// add to cache
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if (s == secindex && s < MAX_SEC_CACHE_ENTRIES) {
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sector_cache[s].sector = sector;
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sector_cache[s].visit_count++;
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needs_cache_sector = true;
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secindex++;
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}
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}
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u32 cluster = sector / SECTORS_PER_CLUSTER;
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u32 aligned_sector = cluster * SECTORS_PER_CLUSTER;
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u32 sector_index_in_cluster = sector % SECTORS_PER_CLUSTER;
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u32 cluster_lookup_index = cluster_lookup[cluster];
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if (nx_emmc_part_read(&storage, system_part, sector, count, buff)) {
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u32 tweak_exp = 0;
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bool regen_tweak = true;
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if (prev_cluster != sector / 0x20) { // sector in different cluster than last read
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prev_cluster = sector / 0x20;
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tweak_exp = sector % 0x20;
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} else if (sector > prev_sector) { // sector in same cluster and past last sector
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tweak_exp = sector - prev_sector - 1;
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regen_tweak = false;
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} else { // sector in same cluster and before or same as last sector
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tweak_exp = sector % 0x20;
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}
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// fatfs will never pull more than a cluster
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_emmc_xts(9, 8, 0, tweak, regen_tweak, tweak_exp, prev_cluster, buff, buff, count * 0x200);
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if (needs_cache_sector) {
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memcpy(sector_cache[s].cached_sector, buff, 0x200);
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memcpy(sector_cache[s].tweak, tweak, 0x10);
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}
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if (cluster_lookup_index != CLUSTER_LOOKUP_EMPTY_ENTRY)
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{
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memcpy(buff, cluster_cache[cluster_lookup_index].cluster + sector_index_in_cluster * NX_EMMC_BLOCKSIZE, count * NX_EMMC_BLOCKSIZE);
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cluster_cache[cluster_lookup_index].visit_count++;
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prev_sector = sector + count - 1;
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prev_cluster = cluster;
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return RES_OK;
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}
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return RES_ERROR;
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// Only cache single-sector reads as these are most likely to be repeated (eg. boot block, FAT directory tables)
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if (count == 1 &&
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!lock_cluster_cache &&
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cluster_cache_index < MAX_CLUSTER_CACHE_ENTRIES &&
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cluster_lookup_index == CLUSTER_LOOKUP_EMPTY_ENTRY)
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{
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cluster_cache[cluster_cache_index].cluster_num = cluster;
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cluster_cache[cluster_cache_index].visit_count = 1;
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cluster_cache[cluster_cache_index].dirty = 0;
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cluster_lookup[cluster] = cluster_cache_index;
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// Read and decrypt the whole cluster the sector resides in
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if (!nx_emmc_part_read(&storage, system_part, aligned_sector, SECTORS_PER_CLUSTER, emmc_buffer))
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return RES_ERROR;
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_emmc_xts(9, 8, 0, tweak, true, 0, cluster, emmc_buffer, emmc_buffer, XTS_CLUSTER_SIZE);
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memcpy(cluster_cache[cluster_cache_index].cluster, emmc_buffer, XTS_CLUSTER_SIZE);
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memcpy(buff, emmc_buffer + sector_index_in_cluster * NX_EMMC_BLOCKSIZE, NX_EMMC_BLOCKSIZE);
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prev_cluster = -1;
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prev_sector = 0;
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cluster_cache_index++;
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return RES_OK;
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}
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if (!nx_emmc_part_read(&storage, system_part, sector, count, buff))
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return RES_ERROR;
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u32 tweak_exp = 0;
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bool regen_tweak = true;
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if (prev_cluster != cluster)
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{ // Sector is in different cluster than last read
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prev_cluster = cluster;
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tweak_exp = sector_index_in_cluster;
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}
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else if (sector > prev_sector)
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{ // Sector is in same cluster and past last sector
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// Calculates the new tweak using the saved one, reducing expensive _gf256_mul_x_le calls
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tweak_exp = sector - prev_sector - 1;
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regen_tweak = false;
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}
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else
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{ // Sector is in same cluster and before or same as last sector
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tweak_exp = sector_index_in_cluster;
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}
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// FatFs will never pull more than one 4K cluster, which is the same as the crypto 'sector' size
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_emmc_xts(9, 8, 0, tweak, regen_tweak, tweak_exp, prev_cluster, buff, buff, count * NX_EMMC_BLOCKSIZE);
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prev_sector = sector + count - 1;
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return RES_OK;
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}
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return RES_ERROR;
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}
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@ -216,15 +245,15 @@ DRESULT disk_write (
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UINT count /* Number of sectors to write */
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)
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{
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if (pdrv == 1)
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return RES_WRPRT;
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if (((u32)buff >= DRAM_START) && !((u32)buff % 8))
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switch (pdrv)
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{
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case 0:
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return sdmmc_storage_write(&sd_storage, sector, count, (void *)buff) ? RES_OK : RES_ERROR;
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u8 *buf = (u8 *)SDMMC_UPPER_BUFFER; //TODO: define this somewhere.
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memcpy(buf, buff, 512 * count);
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if (sdmmc_storage_write(&sd_storage, sector, count, buf))
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return RES_OK;
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case 1:
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return RES_WRPRT;
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}
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return RES_ERROR;
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}
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@ -55,18 +55,18 @@ static void _gf256_mul_x(void *block)
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static void _gf256_mul_x_le(void *block)
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{
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u8 *pdata = (u8 *)block;
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u32 carry = 0;
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u32 *pdata = (u32 *)block;
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u32 carry = 0;
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for (u32 i = 0; i < 0x10; i++)
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for (u32 i = 0; i < 4; i++)
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{
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u8 b = pdata[i];
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pdata[i] = (b << 1) | carry;
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carry = b >> 7;
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}
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u32 b = pdata[i];
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pdata[i] = (b << 1) | carry;
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carry = b >> 31;
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}
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if (carry)
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pdata[0x0] ^= 0x87;
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if (carry)
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pdata[0x0] ^= 0x87;
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}
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static void _se_ll_init(se_ll_t *ll, u32 addr, u32 size)
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