flipperzero-firmware/lib/subghz/subghz_keystore.c

607 lines
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C
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#include "subghz_keystore.h"
#include <furi.h>
#include <furi-hal.h>
[FL-1191][FL-1524] Filesystem rework (#568) * FS-Api: removed datetime manipulation functions and most of the file flags * Filesystem: common proxy api * Filesystem: renamed to Storage. Work has begun on a glue layer. Added functions for reentrance. * Storage: sd mount and sd file open * Storage: sd file close * Storage: temporary test app * Storage: free filedata on close * Storage: sd file read and write * Storage: added internal storage (LittleFS) * Storage: renamed internal commands * Storage: seek, tell, truncate, size, sync, eof * Storage: error descriptions * Storage: directory management api (open, close, read, rewind) * Storage: common management api (stat, fs_stat, remove, rename, mkdir) * Dolphin app and Notifications app now use raw storage. * Storage: storage statuses renamed. Implemented sd card icon. * Storage: added raw sd-card api. * Storage settings: work started * Assets: use new icons approach * Storage settings: working storage settings * Storage: completely redesigned api, no longer sticking out FS_Api * Storage: more simplified api, getting error_id from file is hidden from user, pointer to api is hidden inside file * Storage: cli info and format commands * Storage-cli: file list * Storage: a simpler and more reliable api * FatFS: slightly lighter and faster config. Also disabled reentrancy and file locking functions. They moved to a storage service. * Storage-cli: accommodate to the new cli api. * Storage: filesystem api is separated into internal and common api. * Cli: added the ability to print the list of free heap blocks * Storage: uses a list instead of an array to store the StorageFile. Rewrote api calls to use semaphores instead of thread flags. * Storage settings: added the ability to benchmark the SD card. * Gui module file select: uses new storage api * Apps: removed deprecated sd_card_test application * Args lib: support for enquoted arguments * Dialogs: a new gui app for simple non-asynchronous apps * Dialogs: view holder for easy single view work * File worker: use new storage api * IButton and lfrrfid apps: save keys to any storage * Apps: fix ibutton and lfrfid stack, remove sd_card_test. * SD filesystem: app removed * File worker: fixed api pointer type * Subghz: loading assets using the new storage api * NFC: use the new storage api * Dialogs: the better api for the message element * Archive: use new storage api * Irda: changed assest path, changed app path * FileWorker: removed unused file_buf_cnt * Storage: copying and renaming files now works between storages * Storage cli: read, copy, remove, rename commands * Archive: removed commented code * Storage cli: write command * Applications: add SRV_STORAGE and SRV_DIALOGS * Internal-storage: removed * Storage: improved api * Storage app: changed api pointer from StorageApp to Storage * Storage: better file_id handling * Storage: more consistent errors * Loader: support for NULL icons * Storage: do nothing with the lfs file or directory if it is not open * Storage: fix typo * Storage: minor float usage cleanup, rename some symbols. * Storage: compact doxygen comments. Co-authored-by: あく <alleteam@gmail.com>
2021-07-23 12:20:19 +00:00
#include <storage/storage.h>
#include <toolbox/hex.h>
#include <flipper_file/flipper_file.h>
#define TAG "SubGhzKeystore"
#define FILE_BUFFER_SIZE 64
#define SUBGHZ_KEYSTORE_FILE_TYPE "Flipper SubGhz Keystore File"
#define SUBGHZ_KEYSTORE_FILE_RAW_TYPE "Flipper SubGhz Keystore RAW File"
#define SUBGHZ_KEYSTORE_FILE_VERSION 0
#define SUBGHZ_KEYSTORE_FILE_ENCRYPTION_KEY_SLOT 1
#define SUBGHZ_KEYSTORE_FILE_DECRYPTED_LINE_SIZE 512
#define SUBGHZ_KEYSTORE_FILE_ENCRYPTED_LINE_SIZE (SUBGHZ_KEYSTORE_FILE_DECRYPTED_LINE_SIZE * 2)
typedef enum {
SubGhzKeystoreEncryptionNone,
SubGhzKeystoreEncryptionAES256,
} SubGhzKeystoreEncryption;
struct SubGhzKeystore {
SubGhzKeyArray_t data;
};
SubGhzKeystore* subghz_keystore_alloc() {
SubGhzKeystore* instance = furi_alloc(sizeof(SubGhzKeystore));
SubGhzKeyArray_init(instance->data);
return instance;
}
void subghz_keystore_free(SubGhzKeystore* instance) {
furi_assert(instance);
for
M_EACH(manufacture_code, instance->data, SubGhzKeyArray_t) {
string_clear(manufacture_code->name);
manufacture_code->key = 0;
}
SubGhzKeyArray_clear(instance->data);
free(instance);
}
static void subghz_keystore_add_key(
SubGhzKeystore* instance,
const char* name,
uint64_t key,
uint16_t type) {
SubGhzKey* manufacture_code = SubGhzKeyArray_push_raw(instance->data);
string_init_set_str(manufacture_code->name, name);
manufacture_code->key = key;
manufacture_code->type = type;
}
static bool subghz_keystore_process_line(SubGhzKeystore* instance, char* line) {
uint64_t key = 0;
uint16_t type = 0;
char skey[17] = {0};
char name[65] = {0};
int ret = sscanf(line, "%16s:%hu:%64s", skey, &type, name);
key = strtoull(skey, NULL, 16);
if(ret == 3) {
subghz_keystore_add_key(instance, name, key, type);
return true;
} else {
FURI_LOG_E(TAG, "Failed to load line: %s\r\n", line);
return false;
}
}
static void subghz_keystore_mess_with_iv(uint8_t* iv) {
// Alignment check for `ldrd` instruction
furi_assert(((uint32_t)iv) % 4 == 0);
// Please do not share decrypted manufacture keys
// Sharing them will bring some discomfort to legal owners
// And potential legal action against you
// While you reading this code think about your own personal responsibility
asm volatile("nani: \n"
"ldrd r0, r2, [%0, #0x0] \n"
"lsl r1, r0, #8 \n"
"lsl r3, r2, #8 \n"
"orr r3, r3, r0, lsr #24\n"
"uadd8 r1, r1, r0 \n"
"uadd8 r3, r3, r2 \n"
"strd r1, r3, [%0, #0x0] \n"
"ldrd r1, r3, [%0, #0x8] \n"
"lsl r0, r1, #8 \n"
"orr r0, r0, r2, lsr #24\n"
"lsl r2, r3, #8 \n"
"orr r2, r2, r1, lsr #24\n"
"uadd8 r1, r1, r0 \n"
"uadd8 r3, r3, r2 \n"
"strd r1, r3, [%0, #0x8] \n"
:
: "r"(iv)
: "r0", "r1", "r2", "r3", "memory");
}
static bool subghz_keystore_read_file(SubGhzKeystore* instance, File* file, uint8_t* iv) {
bool result = true;
char buffer[FILE_BUFFER_SIZE];
char* decrypted_line = furi_alloc(SUBGHZ_KEYSTORE_FILE_DECRYPTED_LINE_SIZE);
char* encrypted_line = furi_alloc(SUBGHZ_KEYSTORE_FILE_ENCRYPTED_LINE_SIZE);
size_t encrypted_line_cursor = 0;
if(iv) furi_hal_crypto_store_load_key(SUBGHZ_KEYSTORE_FILE_ENCRYPTION_KEY_SLOT, iv);
size_t ret = 0;
do {
ret = storage_file_read(file, buffer, FILE_BUFFER_SIZE);
for(uint16_t i = 0; i < ret; i++) {
if(buffer[i] == '\n' && encrypted_line_cursor > 0) {
// Process line
if(iv) {
// Data alignment check, 32 instead of 16 because of hex encoding
size_t len = strlen(encrypted_line);
if(len % 32 == 0) {
// Inplace hex to bin conversion
for(size_t i = 0; i < len; i += 2) {
uint8_t hi_nibble = 0;
uint8_t lo_nibble = 0;
hex_char_to_hex_nibble(encrypted_line[i], &hi_nibble);
hex_char_to_hex_nibble(encrypted_line[i + 1], &lo_nibble);
encrypted_line[i / 2] = (hi_nibble << 4) | lo_nibble;
}
len /= 2;
if(furi_hal_crypto_decrypt(
(uint8_t*)encrypted_line, (uint8_t*)decrypted_line, len)) {
subghz_keystore_process_line(instance, decrypted_line);
} else {
FURI_LOG_E(TAG, "Decryption failed");
result = false;
break;
}
} else {
FURI_LOG_E(
TAG, "Invalid encrypted data: %s", encrypted_line);
}
} else {
subghz_keystore_process_line(instance, encrypted_line);
}
// reset line buffer
memset(decrypted_line, 0, SUBGHZ_KEYSTORE_FILE_DECRYPTED_LINE_SIZE);
memset(encrypted_line, 0, SUBGHZ_KEYSTORE_FILE_ENCRYPTED_LINE_SIZE);
encrypted_line_cursor = 0;
} else if(buffer[i] == '\r' || buffer[i] == '\n') {
// do not add line endings to the buffer
} else {
if(encrypted_line_cursor < SUBGHZ_KEYSTORE_FILE_ENCRYPTED_LINE_SIZE) {
encrypted_line[encrypted_line_cursor] = buffer[i];
encrypted_line_cursor++;
} else {
FURI_LOG_E(TAG, "Malformed file");
result = false;
break;
}
}
}
} while(ret > 0 && result);
if(iv) furi_hal_crypto_store_unload_key(SUBGHZ_KEYSTORE_FILE_ENCRYPTION_KEY_SLOT);
free(encrypted_line);
free(decrypted_line);
return result;
}
bool subghz_keystore_load(SubGhzKeystore* instance, const char* file_name) {
furi_assert(instance);
bool result = false;
uint8_t iv[16];
uint32_t version;
SubGhzKeystoreEncryption encryption;
string_t filetype;
string_init(filetype);
Storage* storage = furi_record_open("storage");
FlipperFile* flipper_file = flipper_file_alloc(storage);
do {
if(!flipper_file_open_existing(flipper_file, file_name)) {
FURI_LOG_E(TAG, "Unable to open file for read: %s", file_name);
break;
}
if(!flipper_file_read_header(flipper_file, filetype, &version)) {
FURI_LOG_E(TAG, "Missing or incorrect header");
break;
}
if(!flipper_file_read_uint32(flipper_file, "Encryption", (uint32_t*)&encryption, 1)) {
FURI_LOG_E(TAG, "Missing encryption type");
break;
}
if(strcmp(string_get_cstr(filetype), SUBGHZ_KEYSTORE_FILE_TYPE) != 0 ||
version != SUBGHZ_KEYSTORE_FILE_VERSION) {
FURI_LOG_E(TAG, "Type or version mismatch");
break;
}
File* file = flipper_file_get_file(flipper_file);
if(encryption == SubGhzKeystoreEncryptionNone) {
result = subghz_keystore_read_file(instance, file, NULL);
} else if(encryption == SubGhzKeystoreEncryptionAES256) {
if(!flipper_file_read_hex(flipper_file, "IV", iv, 16)) {
FURI_LOG_E(TAG, "Missing IV");
break;
}
subghz_keystore_mess_with_iv(iv);
result = subghz_keystore_read_file(instance, file, iv);
} else {
FURI_LOG_E(TAG, "Unknown encryption");
break;
}
} while(0);
flipper_file_close(flipper_file);
flipper_file_free(flipper_file);
[FL-1191][FL-1524] Filesystem rework (#568) * FS-Api: removed datetime manipulation functions and most of the file flags * Filesystem: common proxy api * Filesystem: renamed to Storage. Work has begun on a glue layer. Added functions for reentrance. * Storage: sd mount and sd file open * Storage: sd file close * Storage: temporary test app * Storage: free filedata on close * Storage: sd file read and write * Storage: added internal storage (LittleFS) * Storage: renamed internal commands * Storage: seek, tell, truncate, size, sync, eof * Storage: error descriptions * Storage: directory management api (open, close, read, rewind) * Storage: common management api (stat, fs_stat, remove, rename, mkdir) * Dolphin app and Notifications app now use raw storage. * Storage: storage statuses renamed. Implemented sd card icon. * Storage: added raw sd-card api. * Storage settings: work started * Assets: use new icons approach * Storage settings: working storage settings * Storage: completely redesigned api, no longer sticking out FS_Api * Storage: more simplified api, getting error_id from file is hidden from user, pointer to api is hidden inside file * Storage: cli info and format commands * Storage-cli: file list * Storage: a simpler and more reliable api * FatFS: slightly lighter and faster config. Also disabled reentrancy and file locking functions. They moved to a storage service. * Storage-cli: accommodate to the new cli api. * Storage: filesystem api is separated into internal and common api. * Cli: added the ability to print the list of free heap blocks * Storage: uses a list instead of an array to store the StorageFile. Rewrote api calls to use semaphores instead of thread flags. * Storage settings: added the ability to benchmark the SD card. * Gui module file select: uses new storage api * Apps: removed deprecated sd_card_test application * Args lib: support for enquoted arguments * Dialogs: a new gui app for simple non-asynchronous apps * Dialogs: view holder for easy single view work * File worker: use new storage api * IButton and lfrrfid apps: save keys to any storage * Apps: fix ibutton and lfrfid stack, remove sd_card_test. * SD filesystem: app removed * File worker: fixed api pointer type * Subghz: loading assets using the new storage api * NFC: use the new storage api * Dialogs: the better api for the message element * Archive: use new storage api * Irda: changed assest path, changed app path * FileWorker: removed unused file_buf_cnt * Storage: copying and renaming files now works between storages * Storage cli: read, copy, remove, rename commands * Archive: removed commented code * Storage cli: write command * Applications: add SRV_STORAGE and SRV_DIALOGS * Internal-storage: removed * Storage: improved api * Storage app: changed api pointer from StorageApp to Storage * Storage: better file_id handling * Storage: more consistent errors * Loader: support for NULL icons * Storage: do nothing with the lfs file or directory if it is not open * Storage: fix typo * Storage: minor float usage cleanup, rename some symbols. * Storage: compact doxygen comments. Co-authored-by: あく <alleteam@gmail.com>
2021-07-23 12:20:19 +00:00
furi_record_close("storage");
string_clear(filetype);
return result;
}
bool subghz_keystore_save(SubGhzKeystore* instance, const char* file_name, uint8_t* iv) {
furi_assert(instance);
bool result = false;
Storage* storage = furi_record_open("storage");
char* decrypted_line = furi_alloc(SUBGHZ_KEYSTORE_FILE_DECRYPTED_LINE_SIZE);
char* encrypted_line = furi_alloc(SUBGHZ_KEYSTORE_FILE_ENCRYPTED_LINE_SIZE);
FlipperFile* flipper_file = flipper_file_alloc(storage);
do {
if(!flipper_file_open_always(flipper_file, file_name)) {
FURI_LOG_E(TAG, "Unable to open file for write: %s", file_name);
break;
}
if(!flipper_file_write_header_cstr(
flipper_file, SUBGHZ_KEYSTORE_FILE_TYPE, SUBGHZ_KEYSTORE_FILE_VERSION)) {
FURI_LOG_E(TAG, "Unable to add header");
break;
}
uint32_t encryption = SubGhzKeystoreEncryptionAES256;
if(!flipper_file_write_uint32(flipper_file, "Encryption", &encryption, 1)) {
FURI_LOG_E(TAG, "Unable to add Encryption");
break;
}
if(!flipper_file_write_hex(flipper_file, "IV", iv, 16)) {
FURI_LOG_E(TAG, "Unable to add IV");
break;
}
subghz_keystore_mess_with_iv(iv);
if(!furi_hal_crypto_store_load_key(SUBGHZ_KEYSTORE_FILE_ENCRYPTION_KEY_SLOT, iv)) {
FURI_LOG_E(TAG, "Unable to load encryption key");
break;
}
File* file = flipper_file_get_file(flipper_file);
size_t encrypted_line_count = 0;
for
M_EACH(key, instance->data, SubGhzKeyArray_t) {
// Wipe buffer before packing
memset(decrypted_line, 0, SUBGHZ_KEYSTORE_FILE_DECRYPTED_LINE_SIZE);
memset(encrypted_line, 0, SUBGHZ_KEYSTORE_FILE_ENCRYPTED_LINE_SIZE);
// Form unecreypted line
int len = snprintf(
decrypted_line,
SUBGHZ_KEYSTORE_FILE_DECRYPTED_LINE_SIZE,
"%08lX%08lX:%hu:%s",
(uint32_t)(key->key >> 32),
(uint32_t)key->key,
key->type,
string_get_cstr(key->name));
// Verify length and align
furi_assert(len > 0);
if(len % 16 != 0) {
len += (16 - len % 16);
}
furi_assert(len % 16 == 0);
furi_assert(len <= SUBGHZ_KEYSTORE_FILE_DECRYPTED_LINE_SIZE);
// Form encrypted line
if(!furi_hal_crypto_encrypt(
(uint8_t*)decrypted_line, (uint8_t*)encrypted_line, len)) {
FURI_LOG_E(TAG, "Encryption failed");
break;
}
// HEX Encode encrypted line
const char xx[] = "0123456789ABCDEF";
for(size_t i = 0; i < len; i++) {
size_t cursor = len - i - 1;
size_t hex_cursor = len * 2 - i * 2 - 1;
encrypted_line[hex_cursor] = xx[encrypted_line[cursor] & 0xF];
encrypted_line[hex_cursor - 1] = xx[(encrypted_line[cursor] >> 4) & 0xF];
}
storage_file_write(file, encrypted_line, strlen(encrypted_line));
storage_file_write(file, "\n", 1);
encrypted_line_count++;
}
furi_hal_crypto_store_unload_key(SUBGHZ_KEYSTORE_FILE_ENCRYPTION_KEY_SLOT);
2021-11-16 18:52:49 +00:00
size_t total_keys = SubGhzKeyArray_size(instance->data);
result = encrypted_line_count == total_keys;
if (result) {
FURI_LOG_I(TAG, "Success. Encrypted: %d of %d", encrypted_line_count, total_keys);
} else {
FURI_LOG_E(TAG, "Failure. Encrypted: %d of %d", encrypted_line_count, total_keys);
}
} while(0);
flipper_file_close(flipper_file);
flipper_file_free(flipper_file);
free(encrypted_line);
free(decrypted_line);
furi_record_close("storage");
return result;
}
SubGhzKeyArray_t* subghz_keystore_get_data(SubGhzKeystore* instance) {
furi_assert(instance);
return &instance->data;
}
bool subghz_keystore_raw_encrypted_save(
const char* input_file_name,
const char* output_file_name,
uint8_t* iv) {
bool encrypted = false;
uint32_t version;
string_t filetype;
string_init(filetype);
SubGhzKeystoreEncryption encryption;
Storage* storage = furi_record_open("storage");
char* encrypted_line = furi_alloc(SUBGHZ_KEYSTORE_FILE_ENCRYPTED_LINE_SIZE);
FlipperFile* input_flipper_file = flipper_file_alloc(storage);
do {
if(!flipper_file_open_existing(input_flipper_file, input_file_name)) {
FURI_LOG_E(TAG, "Unable to open file for read: %s", input_file_name);
break;
}
if(!flipper_file_read_header(input_flipper_file, filetype, &version)) {
FURI_LOG_E(TAG, "Missing or incorrect header");
break;
}
if(!flipper_file_read_uint32(input_flipper_file, "Encryption", (uint32_t*)&encryption, 1)) {
FURI_LOG_E(TAG, "Missing encryption type");
break;
}
if(strcmp(string_get_cstr(filetype), SUBGHZ_KEYSTORE_FILE_RAW_TYPE) != 0 ||
version != SUBGHZ_KEYSTORE_FILE_VERSION) {
FURI_LOG_E(TAG, "Type or version mismatch");
break;
}
if(encryption != SubGhzKeystoreEncryptionNone) {
FURI_LOG_E(TAG, "Already encryption");
break;
}
File* input_file = flipper_file_get_file(input_flipper_file);
FlipperFile* output_flipper_file = flipper_file_alloc(storage);
if(!flipper_file_open_always(output_flipper_file, output_file_name)) {
FURI_LOG_E(TAG, "Unable to open file for write: %s", output_file_name);
break;
}
if(!flipper_file_write_header_cstr(
output_flipper_file, string_get_cstr(filetype), SUBGHZ_KEYSTORE_FILE_VERSION)) {
FURI_LOG_E(TAG, "Unable to add header");
break;
}
uint32_t encryption = SubGhzKeystoreEncryptionAES256;
if(!flipper_file_write_uint32(
output_flipper_file, "Encryption", &encryption, 1)) {
FURI_LOG_E(TAG, "Unable to add Encryption");
break;
}
if(!flipper_file_write_hex(output_flipper_file, "IV", iv, 16)) {
FURI_LOG_E(TAG, "Unable to add IV");
break;
}
if(!flipper_file_write_string_cstr(output_flipper_file, "Encrypt_data", "RAW")) {
FURI_LOG_E(TAG, "Unable to add Encrypt_data");
break;
}
subghz_keystore_mess_with_iv(iv);
if(!furi_hal_crypto_store_load_key(SUBGHZ_KEYSTORE_FILE_ENCRYPTION_KEY_SLOT, iv)) {
FURI_LOG_E(TAG, "Unable to load encryption key");
break;
}
File* output_file = flipper_file_get_file(output_flipper_file);
char buffer[FILE_BUFFER_SIZE];
bool result = true;
size_t ret = 0;
furi_assert(FILE_BUFFER_SIZE % 16 == 0);
//skip the end of the previous line "\n"
storage_file_read(input_file, buffer, 1);
do {
memset(buffer, 0, FILE_BUFFER_SIZE);
ret = storage_file_read(input_file, buffer, FILE_BUFFER_SIZE);
if(ret == 0) {
break;
}
for(uint16_t i = 0; i < FILE_BUFFER_SIZE - 1; i += 2) {
uint8_t hi_nibble = 0;
uint8_t lo_nibble = 0;
hex_char_to_hex_nibble(buffer[i], &hi_nibble);
hex_char_to_hex_nibble(buffer[i + 1], &lo_nibble);
buffer[i / 2] = (hi_nibble << 4) | lo_nibble;
}
memset(encrypted_line, 0, SUBGHZ_KEYSTORE_FILE_ENCRYPTED_LINE_SIZE);
// Form encrypted line
if(!furi_hal_crypto_encrypt(
(uint8_t*)buffer, (uint8_t*)encrypted_line, FILE_BUFFER_SIZE / 2)) {
FURI_LOG_E(TAG, "Encryption failed");
result = false;
break;
}
// HEX Encode encrypted line
const char xx[] = "0123456789ABCDEF";
for(size_t i = 0; i < FILE_BUFFER_SIZE / 2; i++) {
size_t cursor = FILE_BUFFER_SIZE / 2 - i - 1;
size_t hex_cursor = FILE_BUFFER_SIZE - i * 2 - 1;
encrypted_line[hex_cursor] = xx[encrypted_line[cursor] & 0xF];
encrypted_line[hex_cursor - 1] = xx[(encrypted_line[cursor] >> 4) & 0xF];
}
storage_file_write(output_file, encrypted_line, strlen(encrypted_line));
} while(ret > 0 && result);
flipper_file_close(output_flipper_file);
flipper_file_free(output_flipper_file);
furi_hal_crypto_store_unload_key(SUBGHZ_KEYSTORE_FILE_ENCRYPTION_KEY_SLOT);
if(!result) break;
encrypted = true;
} while(0);
flipper_file_close(input_flipper_file);
flipper_file_free(input_flipper_file);
free(encrypted_line);
furi_record_close("storage");
return encrypted;
}
bool subghz_keystore_raw_get_data(const char* file_name, size_t offset, uint8_t* data, size_t len) {
bool result = false;
uint8_t iv[16];
uint32_t version;
SubGhzKeystoreEncryption encryption;
string_t str_temp;
string_init(str_temp);
Storage* storage = furi_record_open("storage");
char* decrypted_line = furi_alloc(SUBGHZ_KEYSTORE_FILE_DECRYPTED_LINE_SIZE);
FlipperFile* flipper_file = flipper_file_alloc(storage);
do {
if(!flipper_file_open_existing(flipper_file, file_name)) {
FURI_LOG_E(TAG, "Unable to open file for read: %s", file_name);
break;
}
if(!flipper_file_read_header(flipper_file, str_temp, &version)) {
FURI_LOG_E(TAG, "Missing or incorrect header");
break;
}
if(!flipper_file_read_uint32(flipper_file, "Encryption", (uint32_t*)&encryption, 1)) {
FURI_LOG_E(TAG, "Missing encryption type");
break;
}
if(strcmp(string_get_cstr(str_temp), SUBGHZ_KEYSTORE_FILE_RAW_TYPE) != 0 ||
version != SUBGHZ_KEYSTORE_FILE_VERSION) {
FURI_LOG_E(TAG, "Type or version mismatch");
break;
}
File* file = flipper_file_get_file(flipper_file);
if(encryption != SubGhzKeystoreEncryptionAES256) {
FURI_LOG_E(TAG, "Unknown encryption");
break;
}
if(offset < 16) {
if(!flipper_file_read_hex(flipper_file, "IV", iv, 16)) {
FURI_LOG_E(TAG, "Missing IV");
break;
}
subghz_keystore_mess_with_iv(iv);
}
if(!flipper_file_read_string(flipper_file, "Encrypt_data", str_temp)) {
FURI_LOG_E(TAG, "Missing Encrypt_data");
break;
}
size_t bufer_size;
if(len <= (16 - offset % 16)) {
bufer_size = 32;
} else {
bufer_size = (((len) / 16) + 2) * 32;
}
furi_assert(SUBGHZ_KEYSTORE_FILE_DECRYPTED_LINE_SIZE >= bufer_size / 2);
char buffer[bufer_size];
size_t ret = 0;
bool decrypted = true;
//skip the end of the previous line "\n"
storage_file_read(file, buffer, 1);
size_t size = storage_file_size(file);
size -= storage_file_tell(file);
if(size < (offset * 2 + len * 2)) {
FURI_LOG_E(TAG, "Seek position exceeds file size");
break;
}
if(offset >= 16) {
storage_file_seek(file, ((offset / 16) - 1) * 32, false);
ret = storage_file_read(file, buffer, 32);
furi_assert(ret == 32);
for(uint16_t i = 0; i < ret - 1; i += 2) {
uint8_t hi_nibble = 0;
uint8_t lo_nibble = 0;
hex_char_to_hex_nibble(buffer[i], &hi_nibble);
hex_char_to_hex_nibble(buffer[i + 1], &lo_nibble);
iv[i / 2] = (hi_nibble << 4) | lo_nibble;
}
}
if(!furi_hal_crypto_store_load_key(SUBGHZ_KEYSTORE_FILE_ENCRYPTION_KEY_SLOT, iv)) {
FURI_LOG_E(TAG, "Unable to load encryption key");
break;
}
do {
memset(buffer, 0, bufer_size);
ret = storage_file_read(file, buffer, bufer_size);
furi_assert(ret == bufer_size);
for(uint16_t i = 0; i < ret - 1; i += 2) {
uint8_t hi_nibble = 0;
uint8_t lo_nibble = 0;
hex_char_to_hex_nibble(buffer[i], &hi_nibble);
hex_char_to_hex_nibble(buffer[i + 1], &lo_nibble);
buffer[i / 2] = (hi_nibble << 4) | lo_nibble;
}
memset(decrypted_line, 0, SUBGHZ_KEYSTORE_FILE_DECRYPTED_LINE_SIZE);
if(!furi_hal_crypto_decrypt(
(uint8_t*)buffer, (uint8_t*)decrypted_line, bufer_size / 2)) {
decrypted = false;
FURI_LOG_E(TAG, "Decryption failed");
break;
}
memcpy(data, (uint8_t*)decrypted_line + (offset - (offset / 16) * 16), len);
} while(0);
furi_hal_crypto_store_unload_key(SUBGHZ_KEYSTORE_FILE_ENCRYPTION_KEY_SLOT);
if(decrypted) result = true;
} while(0);
flipper_file_close(flipper_file);
flipper_file_free(flipper_file);
furi_record_close("storage");
free(decrypted_line);
string_clear(str_temp);
return result;
}