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keys: Move RSA functions out of keys.c

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This commit is contained in:
shchmue 2022-11-05 15:41:16 -07:00
parent 1b2c829ca0
commit dcf4bca30c
9 changed files with 266 additions and 241 deletions
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227
source/keys/keys.c
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@ -16,10 +16,8 @@
#include "keys.h"
#include "cal0_read.h"
#include "es_crypto.h"
#include "fs_crypto.h"
#include "gmac.h"
#include "nfc_crypto.h"
#include "ssl_crypto.h"
@ -127,7 +125,7 @@ static void _derive_keyblob_keys(key_storage_t *keys) {
bool have_keyblobs = true;
if (FUSE(FUSE_PRIVATE_KEY0) == 0xFFFFFFFF) {
u8 *aes_keys = (u8 *)calloc(SZ_4K, 1);
u8 *aes_keys = (u8 *)calloc(1, SZ_4K);
se_get_aes_keys(aes_keys + SZ_2K, aes_keys, SE_KEY_128_SIZE);
memcpy(keys->sbk, aes_keys + 14 * SE_KEY_128_SIZE, SE_KEY_128_SIZE);
free(aes_keys);
@ -183,22 +181,47 @@ static void _derive_keyblob_keys(key_storage_t *keys) {
free(keyblob_block);
}
static void _derive_master_keys(key_storage_t *prod_keys, key_storage_t *dev_keys, bool is_dev) {
key_storage_t *keys = is_dev ? dev_keys : prod_keys;
if (h_cfg.t210b01) {
_derive_master_keys_mariko(keys, is_dev);
_derive_master_keys_from_latest_key(keys, is_dev);
} else {
if (run_ams_keygen(keys)) {
EPRINTF("Failed to run keygen.");
return;
}
u8 *aes_keys = (u8 *)calloc(1, SZ_4K);
se_get_aes_keys(aes_keys + SZ_2K, aes_keys, SE_KEY_128_SIZE);
memcpy(&dev_keys->tsec_root_key, aes_keys + KS_TSEC_ROOT_DEV * SE_KEY_128_SIZE, SE_KEY_128_SIZE);
memcpy(keys->tsec_key, aes_keys + KS_TSEC * SE_KEY_128_SIZE, SE_KEY_128_SIZE);
memcpy(&prod_keys->tsec_root_key, aes_keys + KS_TSEC_ROOT * SE_KEY_128_SIZE, SE_KEY_128_SIZE);
free(aes_keys);
_derive_master_keys_from_latest_key(prod_keys, false);
_derive_master_keys_from_latest_key(dev_keys, true);
_derive_keyblob_keys(keys);
}
}
static void _derive_bis_keys(key_storage_t *keys) {
minerva_periodic_training();
u32 generation = fuse_read_odm_keygen_rev();
fs_derive_bis_keys(keys, keys->bis_key, generation);
}
static void _derive_misc_keys(key_storage_t *keys, bool is_dev) {
static void _derive_misc_keys(key_storage_t *keys) {
minerva_periodic_training();
fs_derive_save_mac_key(keys, keys->save_mac_key);
es_derive_rsa_kek_original(keys, keys->eticket_rsa_kek, is_dev);
ssl_derive_rsa_kek_original(keys, keys->ssl_rsa_kek, is_dev);
}
static void _derive_non_unique_keys(key_storage_t *keys) {
static void _derive_non_unique_keys(key_storage_t *keys, bool is_dev) {
minerva_periodic_training();
fs_derive_header_key(keys, keys->header_key);
es_derive_rsa_kek_original(keys, keys->eticket_rsa_kek, is_dev);
ssl_derive_rsa_kek_original(keys, keys->ssl_rsa_kek, is_dev);
for (u32 generation = 0; generation < ARRAY_SIZE(keys->master_key); generation++) {
minerva_periodic_training();
@ -223,34 +246,6 @@ static bool _count_ticket_records(u32 buf_size, titlekey_buffer_t *titlekey_buff
return false;
}
static void _decode_tickets(u32 buf_size, titlekey_buffer_t *titlekey_buffer, u32 remaining, u32 total, u32 x, u32 y, u32 *pct, u32 *last_pct, bool is_personalized) {
ticket_t *curr_ticket = (ticket_t *)titlekey_buffer->read_buffer;
for (u32 i = 0; i < MIN(buf_size / sizeof(ticket_t), remaining) * sizeof(ticket_t) && curr_ticket->signature_type != 0; i += sizeof(ticket_t), curr_ticket++) {
minerva_periodic_training();
*pct = (total - remaining) * 100 / total;
if (*pct > *last_pct && *pct <= 100) {
*last_pct = *pct;
tui_pbar(x, y, *pct, COLOR_GREEN, 0xFF155500);
}
// This is in case an encrypted volatile ticket is left behind
if (curr_ticket->signature_type != TICKET_SIG_TYPE_RSA2048_SHA256)
continue;
u8 *curr_titlekey = curr_ticket->titlekey_block;
const u32 block_size = SE_RSA2048_DIGEST_SIZE;
const u32 titlekey_size = sizeof(titlekey_buffer->titlekeys[0]);
if (is_personalized) {
se_rsa_exp_mod(0, curr_titlekey, block_size, curr_titlekey, block_size);
if (rsa_oaep_decode(curr_titlekey, titlekey_size, null_hash, sizeof(null_hash), curr_titlekey, block_size) != titlekey_size)
continue;
}
memcpy(titlekey_buffer->rights_ids[_titlekey_count], curr_ticket->rights_id, sizeof(titlekey_buffer->rights_ids[0]));
memcpy(titlekey_buffer->titlekeys[_titlekey_count], curr_titlekey, titlekey_size);
_titlekey_count++;
}
}
static bool _get_titlekeys_from_save(u32 buf_size, const u8 *save_mac_key, titlekey_buffer_t *titlekey_buffer, eticket_rsa_keypair_t *rsa_keypair) {
FIL fp;
u64 br = buf_size;
@ -328,7 +323,7 @@ static bool _get_titlekeys_from_save(u32 buf_size, const u8 *save_mac_key, title
if (!save_data_file_read(&ticket_file, &br, offset, titlekey_buffer->read_buffer, buf_size) || titlekey_buffer->read_buffer[0] == 0 || br != buf_size)
break;
offset += br;
_decode_tickets(buf_size, titlekey_buffer, remaining, file_tkey_count, save_x, save_y, &pct, &last_pct, is_personalized);
es_decode_tickets(buf_size, titlekey_buffer, remaining, file_tkey_count, &_titlekey_count, save_x, save_y, &pct, &last_pct, is_personalized);
remaining -= MIN(buf_size / sizeof(ticket_t), remaining);
}
tui_pbar(save_x, save_y, 100, COLOR_GREEN, 0xFF155500);
@ -382,7 +377,8 @@ static bool _derive_sd_seed(key_storage_t *keys) {
}
u8 read_buf[0x20] __attribute__((aligned(4))) = {0};
// Skip the two header blocks and only check the first bytes of each block - file contents are always block-aligned
// Skip the two header blocks and only check the first bytes of each block
// File contents are always block-aligned
for (u32 i = SAVE_BLOCK_SIZE_DEFAULT * 2; i < f_size(&fp); i += SAVE_BLOCK_SIZE_DEFAULT) {
if (f_lseek(&fp, i) || f_read(&fp, read_buf, 0x20, &read_bytes) || read_bytes != 0x20)
break;
@ -398,120 +394,8 @@ static bool _derive_sd_seed(key_storage_t *keys) {
return true;
}
static bool _decrypt_ssl_rsa_key(key_storage_t *keys, titlekey_buffer_t *titlekey_buffer) {
if (!cal0_read(KS_BIS_00_TWEAK, KS_BIS_00_CRYPT, titlekey_buffer->read_buffer)) {
return false;
}
nx_emmc_cal0_t *cal0 = (nx_emmc_cal0_t *)titlekey_buffer->read_buffer;
u32 generation = 0;
const void *encrypted_key = NULL;
const void *iv = NULL;
u32 key_size = 0;
void *ctr_key = NULL;
bool enforce_unique = true;
if (!cal0_get_ssl_rsa_key(cal0, &encrypted_key, &key_size, &iv, &generation)) {
return false;
}
if (key_size == SSL_RSA_KEY_SIZE) {
bool all_zero = true;
const u8 *key8 = (const u8 *)encrypted_key;
for (u32 i = SE_RSA2048_DIGEST_SIZE; i < SSL_RSA_KEY_SIZE; i++) {
if (key8[i] != 0) {
all_zero = false;
break;
}
}
if (all_zero) {
// Keys of this form are not encrypted
memcpy(keys->ssl_rsa_key, encrypted_key, SE_RSA2048_DIGEST_SIZE);
return true;
}
ssl_derive_rsa_kek_legacy(keys, keys->ssl_rsa_kek_legacy);
ctr_key = keys->ssl_rsa_kek_legacy;
enforce_unique = false;
} else if (generation) {
ssl_derive_rsa_kek_device_unique(keys, keys->ssl_rsa_kek_personalized, generation);
ctr_key = keys->ssl_rsa_kek_personalized;
} else {
ctr_key = keys->ssl_rsa_kek;
}
u32 ctr_size = enforce_unique ? key_size - 0x20 : key_size - 0x10;
se_aes_key_set(KS_AES_CTR, ctr_key, SE_KEY_128_SIZE);
se_aes_crypt_ctr(KS_AES_CTR, keys->ssl_rsa_key, ctr_size, encrypted_key, ctr_size, iv);
if (enforce_unique) {
u32 calc_mac[SE_KEY_128_SIZE / 4] = {0};
calc_gmac(KS_AES_ECB, calc_mac, keys->ssl_rsa_key, ctr_size, ctr_key, iv);
const u8 *key8 = (const u8 *)encrypted_key;
if (memcmp(calc_mac, &key8[ctr_size], 0x10) != 0) {
EPRINTF("SSL keypair has invalid GMac.");
memset(keys->ssl_rsa_key, 0, sizeof(keys->ssl_rsa_key));
return false;
}
}
return true;
}
static bool _decrypt_eticket_rsa_key(key_storage_t *keys, titlekey_buffer_t *titlekey_buffer, bool is_dev) {
if (!cal0_read(KS_BIS_00_TWEAK, KS_BIS_00_CRYPT, titlekey_buffer->read_buffer)) {
return false;
}
nx_emmc_cal0_t *cal0 = (nx_emmc_cal0_t *)titlekey_buffer->read_buffer;
u32 generation = 0;
const void *encrypted_key = NULL;
const void *iv = NULL;
u32 key_size = 0;
void *ctr_key = NULL;
if (!cal0_get_eticket_rsa_key(cal0, &encrypted_key, &key_size, &iv, &generation)) {
return false;
}
// Handle legacy case
if (key_size == ETICKET_RSA_KEYPAIR_SIZE) {
u32 temp_key[SE_KEY_128_SIZE / 4] = {0};
es_derive_rsa_kek_legacy(keys, temp_key);
ctr_key = temp_key;
se_aes_key_set(KS_AES_CTR, ctr_key, SE_KEY_128_SIZE);
se_aes_crypt_ctr(KS_AES_CTR, &keys->eticket_rsa_keypair, sizeof(keys->eticket_rsa_keypair), encrypted_key, sizeof(keys->eticket_rsa_keypair), iv);
if (test_eticket_rsa_keypair(&keys->eticket_rsa_keypair)) {
memcpy(keys->eticket_rsa_kek, ctr_key, sizeof(keys->eticket_rsa_kek));
return true;
}
// Fall through and try usual method if not applicable
}
if (generation) {
es_derive_rsa_kek_device_unique(keys, keys->eticket_rsa_kek_personalized, generation, is_dev);
ctr_key = keys->eticket_rsa_kek_personalized;
} else {
ctr_key = keys->eticket_rsa_kek;
}
se_aes_key_set(KS_AES_CTR, ctr_key, SE_KEY_128_SIZE);
se_aes_crypt_ctr(KS_AES_CTR, &keys->eticket_rsa_keypair, sizeof(keys->eticket_rsa_keypair), encrypted_key, sizeof(keys->eticket_rsa_keypair), iv);
if (!test_eticket_rsa_keypair(&keys->eticket_rsa_keypair)) {
EPRINTF("Invalid eticket keypair.");
memset(&keys->eticket_rsa_keypair, 0, sizeof(keys->eticket_rsa_keypair));
return false;
}
return true;
}
static bool _derive_titlekeys(key_storage_t *keys, titlekey_buffer_t *titlekey_buffer, bool is_dev) {
if (!key_exists(keys->eticket_rsa_kek)) {
if (!key_exists(&keys->eticket_rsa_keypair)) {
return false;
}
@ -543,12 +427,12 @@ static bool _derive_emmc_keys(key_storage_t *keys, titlekey_buffer_t *titlekey_b
return false;
}
bool res = _decrypt_ssl_rsa_key(keys, titlekey_buffer);
bool res = decrypt_ssl_rsa_key(keys, titlekey_buffer);
if (!res) {
EPRINTF("Unable to derive SSL key.");
}
res =_decrypt_eticket_rsa_key(keys, titlekey_buffer, is_dev);
res = decrypt_eticket_rsa_key(keys, titlekey_buffer, is_dev);
if (!res) {
EPRINTF("Unable to derive ETicket key.");
}
@ -611,7 +495,7 @@ int save_mariko_partial_keys(u32 start, u32 count, bool append) {
u32 pos = 0;
u32 zeros[SE_KEY_128_SIZE / 4] = {0};
u8 *data = malloc(4 * SE_KEY_128_SIZE);
char *text_buffer = calloc(1, 0x100 * count);
char *text_buffer = calloc(count, 0x100);
for (u32 ks = start; ks < start + count; ks++) {
// Check if key is as expected
@ -688,14 +572,13 @@ int save_mariko_partial_keys(u32 start, u32 count, bool append) {
}
static void _save_keys_to_sd(key_storage_t *keys, titlekey_buffer_t *titlekey_buffer, bool is_dev) {
char *text_buffer = NULL;
if (!sd_mount()) {
EPRINTF("Unable to mount SD.");
return;
}
u32 text_buffer_size = MAX(_titlekey_count * sizeof(titlekey_text_buffer_t) + 1, SZ_16K);
text_buffer = (char *)calloc(1, text_buffer_size);
char *text_buffer = (char *)calloc(1, text_buffer_size);
SAVE_KEY(aes_kek_generation_source);
SAVE_KEY(aes_key_generation_source);
@ -765,9 +648,8 @@ static void _save_keys_to_sd(key_storage_t *keys, titlekey_buffer_t *titlekey_bu
SAVE_KEY(titlekek_source);
SAVE_KEY_VAR(tsec_key, keys->tsec_key);
const u32 root_key_ver = 2;
char root_key_name[21] = "tsec_root_key_00";
s_printf(root_key_name + 14, "%02x", root_key_ver);
s_printf(root_key_name + 14, "%02x", TSEC_ROOT_KEY_VERSION);
_save_key(root_key_name, keys->tsec_root_key, SE_KEY_128_SIZE, text_buffer);
gfx_printf("\n%k Found %d %s keys.\n\n", colors[(color_idx++) % 6], _key_count, is_dev ? "dev" : "prod");
@ -811,31 +693,6 @@ static void _save_keys_to_sd(key_storage_t *keys, titlekey_buffer_t *titlekey_bu
free(text_buffer);
}
static void _derive_master_keys(key_storage_t *prod_keys, key_storage_t *dev_keys, bool is_dev) {
key_storage_t *keys = is_dev ? dev_keys : prod_keys;
if (h_cfg.t210b01) {
_derive_master_keys_mariko(keys, is_dev);
_derive_master_keys_from_latest_key(keys, is_dev);
} else {
if (run_ams_keygen(keys)) {
EPRINTF("Failed to run keygen.");
return;
}
u8 *aes_keys = (u8 *)calloc(SZ_4K, 1);
se_get_aes_keys(aes_keys + SZ_2K, aes_keys, SE_KEY_128_SIZE);
memcpy(&dev_keys->tsec_root_key, aes_keys + KS_TSEC_ROOT_DEV * SE_KEY_128_SIZE, SE_KEY_128_SIZE);
memcpy(keys->tsec_key, aes_keys + KS_TSEC * SE_KEY_128_SIZE, SE_KEY_128_SIZE);
memcpy(&prod_keys->tsec_root_key, aes_keys + KS_TSEC_ROOT * SE_KEY_128_SIZE, SE_KEY_128_SIZE);
free(aes_keys);
_derive_master_keys_from_latest_key(prod_keys, false);
_derive_master_keys_from_latest_key(dev_keys, true);
_derive_keyblob_keys(keys);
}
}
static void _derive_keys() {
minerva_periodic_training();
@ -872,9 +729,9 @@ static void _derive_keys() {
TPRINTFARGS("%kBIS keys... ", colors[(color_idx++) % 6]);
_derive_misc_keys(keys, is_dev);
_derive_non_unique_keys(&prod_keys);
_derive_non_unique_keys(&dev_keys);
_derive_misc_keys(keys);
_derive_non_unique_keys(&prod_keys, is_dev);
_derive_non_unique_keys(&dev_keys, is_dev);
titlekey_buffer_t *titlekey_buffer = (titlekey_buffer_t *)TITLEKEY_BUF_ADR;