mirror of
https://github.com/DarkFlippers/unleashed-firmware
synced 2024-11-30 08:20:21 +00:00
e8913f2e33
* Remove srand invocation * PVS High priority fixes * PVS High errors part 2 * Furi: heap tracing inheritance * Furi add __builtin_unreachable to furi_thread_catch
613 lines
22 KiB
C
613 lines
22 KiB
C
#include "subghz_keystore.h"
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#include <furi.h>
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#include <furi_hal.h>
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#include <storage/storage.h>
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#include <toolbox/hex.h>
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#include <toolbox/stream/stream.h>
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#include <flipper_format/flipper_format.h>
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#include <flipper_format/flipper_format_i.h>
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#define TAG "SubGhzKeystore"
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#define FILE_BUFFER_SIZE 64
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#define SUBGHZ_KEYSTORE_FILE_TYPE "Flipper SubGhz Keystore File"
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#define SUBGHZ_KEYSTORE_FILE_RAW_TYPE "Flipper SubGhz Keystore RAW File"
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#define SUBGHZ_KEYSTORE_FILE_VERSION 0
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#define SUBGHZ_KEYSTORE_FILE_ENCRYPTION_KEY_SLOT 1
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#define SUBGHZ_KEYSTORE_FILE_DECRYPTED_LINE_SIZE 512
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#define SUBGHZ_KEYSTORE_FILE_ENCRYPTED_LINE_SIZE (SUBGHZ_KEYSTORE_FILE_DECRYPTED_LINE_SIZE * 2)
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typedef enum {
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SubGhzKeystoreEncryptionNone,
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SubGhzKeystoreEncryptionAES256,
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} SubGhzKeystoreEncryption;
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struct SubGhzKeystore {
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SubGhzKeyArray_t data;
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};
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SubGhzKeystore* subghz_keystore_alloc() {
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SubGhzKeystore* instance = malloc(sizeof(SubGhzKeystore));
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SubGhzKeyArray_init(instance->data);
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return instance;
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}
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void subghz_keystore_free(SubGhzKeystore* instance) {
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furi_assert(instance);
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for
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M_EACH(manufacture_code, instance->data, SubGhzKeyArray_t) {
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furi_string_free(manufacture_code->name);
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manufacture_code->key = 0;
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}
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SubGhzKeyArray_clear(instance->data);
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free(instance);
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}
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static void subghz_keystore_add_key(
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SubGhzKeystore* instance,
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const char* name,
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uint64_t key,
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uint16_t type) {
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SubGhzKey* manufacture_code = SubGhzKeyArray_push_raw(instance->data);
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manufacture_code->name = furi_string_alloc_set(name);
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manufacture_code->key = key;
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manufacture_code->type = type;
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}
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static bool subghz_keystore_process_line(SubGhzKeystore* instance, char* line) {
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uint64_t key = 0;
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uint16_t type = 0;
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char skey[17] = {0};
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char name[65] = {0};
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int ret = sscanf(line, "%16s:%hu:%64s", skey, &type, name);
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key = strtoull(skey, NULL, 16);
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if(ret == 3) {
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subghz_keystore_add_key(instance, name, key, type);
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return true;
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} else {
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FURI_LOG_E(TAG, "Failed to load line: %s\r\n", line);
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return false;
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}
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}
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static void subghz_keystore_mess_with_iv(uint8_t* iv) {
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// Alignment check for `ldrd` instruction
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furi_assert(((uint32_t)iv) % 4 == 0);
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// Please do not share decrypted manufacture keys
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// Sharing them will bring some discomfort to legal owners
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// And potential legal action against you
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// While you reading this code think about your own personal responsibility
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asm volatile("nani%=: \n"
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"ldrd r0, r2, [%0, #0x0] \n"
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"lsl r1, r0, #8 \n"
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"lsl r3, r2, #8 \n"
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"orr r3, r3, r0, lsr #24\n"
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"uadd8 r1, r1, r0 \n"
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"uadd8 r3, r3, r2 \n"
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"strd r1, r3, [%0, #0x0] \n"
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"ldrd r1, r3, [%0, #0x8] \n"
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"lsl r0, r1, #8 \n"
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"orr r0, r0, r2, lsr #24\n"
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"lsl r2, r3, #8 \n"
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"orr r2, r2, r1, lsr #24\n"
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"uadd8 r1, r1, r0 \n"
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"uadd8 r3, r3, r2 \n"
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"strd r1, r3, [%0, #0x8] \n"
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:
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: "r"(iv)
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: "r0", "r1", "r2", "r3", "memory");
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}
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static bool subghz_keystore_read_file(SubGhzKeystore* instance, Stream* stream, uint8_t* iv) {
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bool result = true;
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uint8_t buffer[FILE_BUFFER_SIZE];
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char* decrypted_line = malloc(SUBGHZ_KEYSTORE_FILE_DECRYPTED_LINE_SIZE);
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char* encrypted_line = malloc(SUBGHZ_KEYSTORE_FILE_ENCRYPTED_LINE_SIZE);
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size_t encrypted_line_cursor = 0;
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do {
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if(iv) {
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if(!furi_hal_crypto_store_load_key(SUBGHZ_KEYSTORE_FILE_ENCRYPTION_KEY_SLOT, iv)) {
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FURI_LOG_E(TAG, "Unable to load decryption key");
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break;
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}
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}
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size_t ret = 0;
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do {
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ret = stream_read(stream, buffer, FILE_BUFFER_SIZE);
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for(uint16_t i = 0; i < ret; i++) {
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if(buffer[i] == '\n' && encrypted_line_cursor > 0) {
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// Process line
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if(iv) {
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// Data alignment check, 32 instead of 16 because of hex encoding
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size_t len = strlen(encrypted_line);
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if(len % 32 == 0) {
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// Inplace hex to bin conversion
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for(size_t i = 0; i < len; i += 2) {
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uint8_t hi_nibble = 0;
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uint8_t lo_nibble = 0;
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hex_char_to_hex_nibble(encrypted_line[i], &hi_nibble);
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hex_char_to_hex_nibble(encrypted_line[i + 1], &lo_nibble);
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encrypted_line[i / 2] = (hi_nibble << 4) | lo_nibble;
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}
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len /= 2;
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if(furi_hal_crypto_decrypt(
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(uint8_t*)encrypted_line, (uint8_t*)decrypted_line, len)) {
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subghz_keystore_process_line(instance, decrypted_line);
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} else {
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FURI_LOG_E(TAG, "Decryption failed");
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result = false;
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break;
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}
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} else {
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FURI_LOG_E(TAG, "Invalid encrypted data: %s", encrypted_line);
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}
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} else {
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subghz_keystore_process_line(instance, encrypted_line);
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}
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// reset line buffer
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memset(decrypted_line, 0, SUBGHZ_KEYSTORE_FILE_DECRYPTED_LINE_SIZE);
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memset(encrypted_line, 0, SUBGHZ_KEYSTORE_FILE_ENCRYPTED_LINE_SIZE);
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encrypted_line_cursor = 0;
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} else if(buffer[i] == '\r' || buffer[i] == '\n') {
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// do not add line endings to the buffer
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} else {
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if(encrypted_line_cursor < SUBGHZ_KEYSTORE_FILE_ENCRYPTED_LINE_SIZE) {
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encrypted_line[encrypted_line_cursor] = buffer[i];
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encrypted_line_cursor++;
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} else {
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FURI_LOG_E(TAG, "Malformed file");
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result = false;
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break;
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}
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}
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}
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} while(ret > 0 && result);
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if(iv) furi_hal_crypto_store_unload_key(SUBGHZ_KEYSTORE_FILE_ENCRYPTION_KEY_SLOT);
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} while(false);
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free(encrypted_line);
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free(decrypted_line);
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return result;
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}
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bool subghz_keystore_load(SubGhzKeystore* instance, const char* file_name) {
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furi_assert(instance);
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bool result = false;
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uint8_t iv[16];
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uint32_t version;
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SubGhzKeystoreEncryption encryption;
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FuriString* filetype;
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filetype = furi_string_alloc();
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FURI_LOG_I(TAG, "Loading keystore %s", file_name);
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Storage* storage = furi_record_open(RECORD_STORAGE);
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FlipperFormat* flipper_format = flipper_format_file_alloc(storage);
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do {
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if(!flipper_format_file_open_existing(flipper_format, file_name)) {
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FURI_LOG_E(TAG, "Unable to open file for read: %s", file_name);
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break;
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}
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if(!flipper_format_read_header(flipper_format, filetype, &version)) {
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FURI_LOG_E(TAG, "Missing or incorrect header");
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break;
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}
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if(!flipper_format_read_uint32(flipper_format, "Encryption", (uint32_t*)&encryption, 1)) {
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FURI_LOG_E(TAG, "Missing encryption type");
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break;
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}
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if(strcmp(furi_string_get_cstr(filetype), SUBGHZ_KEYSTORE_FILE_TYPE) != 0 ||
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version != SUBGHZ_KEYSTORE_FILE_VERSION) {
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FURI_LOG_E(TAG, "Type or version mismatch");
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break;
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}
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Stream* stream = flipper_format_get_raw_stream(flipper_format);
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if(encryption == SubGhzKeystoreEncryptionNone) {
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result = subghz_keystore_read_file(instance, stream, NULL);
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} else if(encryption == SubGhzKeystoreEncryptionAES256) {
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if(!flipper_format_read_hex(flipper_format, "IV", iv, 16)) {
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FURI_LOG_E(TAG, "Missing IV");
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break;
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}
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subghz_keystore_mess_with_iv(iv);
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result = subghz_keystore_read_file(instance, stream, iv);
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} else {
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FURI_LOG_E(TAG, "Unknown encryption");
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break;
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}
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} while(0);
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flipper_format_free(flipper_format);
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furi_record_close(RECORD_STORAGE);
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furi_string_free(filetype);
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return result;
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}
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bool subghz_keystore_save(SubGhzKeystore* instance, const char* file_name, uint8_t* iv) {
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furi_assert(instance);
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bool result = false;
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Storage* storage = furi_record_open(RECORD_STORAGE);
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char* decrypted_line = malloc(SUBGHZ_KEYSTORE_FILE_DECRYPTED_LINE_SIZE);
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char* encrypted_line = malloc(SUBGHZ_KEYSTORE_FILE_ENCRYPTED_LINE_SIZE);
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FlipperFormat* flipper_format = flipper_format_file_alloc(storage);
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do {
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if(!flipper_format_file_open_always(flipper_format, file_name)) {
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FURI_LOG_E(TAG, "Unable to open file for write: %s", file_name);
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break;
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}
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if(!flipper_format_write_header_cstr(
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flipper_format, SUBGHZ_KEYSTORE_FILE_TYPE, SUBGHZ_KEYSTORE_FILE_VERSION)) {
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FURI_LOG_E(TAG, "Unable to add header");
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break;
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}
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uint32_t encryption = SubGhzKeystoreEncryptionAES256;
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if(!flipper_format_write_uint32(flipper_format, "Encryption", &encryption, 1)) {
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FURI_LOG_E(TAG, "Unable to add Encryption");
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break;
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}
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if(!flipper_format_write_hex(flipper_format, "IV", iv, 16)) {
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FURI_LOG_E(TAG, "Unable to add IV");
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break;
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}
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subghz_keystore_mess_with_iv(iv);
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if(!furi_hal_crypto_store_load_key(SUBGHZ_KEYSTORE_FILE_ENCRYPTION_KEY_SLOT, iv)) {
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FURI_LOG_E(TAG, "Unable to load encryption key");
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break;
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}
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Stream* stream = flipper_format_get_raw_stream(flipper_format);
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size_t encrypted_line_count = 0;
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for
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M_EACH(key, instance->data, SubGhzKeyArray_t) {
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// Wipe buffer before packing
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memset(decrypted_line, 0, SUBGHZ_KEYSTORE_FILE_DECRYPTED_LINE_SIZE);
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memset(encrypted_line, 0, SUBGHZ_KEYSTORE_FILE_ENCRYPTED_LINE_SIZE);
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// Form unecreypted line
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int len = snprintf(
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decrypted_line,
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SUBGHZ_KEYSTORE_FILE_DECRYPTED_LINE_SIZE,
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"%08lX%08lX:%hu:%s",
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(uint32_t)(key->key >> 32),
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(uint32_t)key->key,
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key->type,
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furi_string_get_cstr(key->name));
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// Verify length and align
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furi_assert(len > 0);
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if(len % 16 != 0) {
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len += (16 - len % 16);
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}
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furi_assert(len % 16 == 0);
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furi_assert(len <= SUBGHZ_KEYSTORE_FILE_DECRYPTED_LINE_SIZE);
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// Form encrypted line
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if(!furi_hal_crypto_encrypt(
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(uint8_t*)decrypted_line, (uint8_t*)encrypted_line, len)) {
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FURI_LOG_E(TAG, "Encryption failed");
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break;
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}
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// HEX Encode encrypted line
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const char xx[] = "0123456789ABCDEF";
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for(int i = 0; i < len; i++) {
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size_t cursor = len - i - 1;
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size_t hex_cursor = len * 2 - i * 2 - 1;
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encrypted_line[hex_cursor] = xx[encrypted_line[cursor] & 0xF];
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encrypted_line[hex_cursor - 1] = xx[(encrypted_line[cursor] >> 4) & 0xF];
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}
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stream_write_cstring(stream, encrypted_line);
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stream_write_char(stream, '\n');
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encrypted_line_count++;
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}
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furi_hal_crypto_store_unload_key(SUBGHZ_KEYSTORE_FILE_ENCRYPTION_KEY_SLOT);
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size_t total_keys = SubGhzKeyArray_size(instance->data);
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result = encrypted_line_count == total_keys;
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if(result) {
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FURI_LOG_I(TAG, "Success. Encrypted: %d of %d", encrypted_line_count, total_keys);
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} else {
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FURI_LOG_E(TAG, "Failure. Encrypted: %d of %d", encrypted_line_count, total_keys);
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}
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} while(0);
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flipper_format_free(flipper_format);
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free(encrypted_line);
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free(decrypted_line);
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furi_record_close(RECORD_STORAGE);
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return result;
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}
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SubGhzKeyArray_t* subghz_keystore_get_data(SubGhzKeystore* instance) {
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furi_assert(instance);
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return &instance->data;
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}
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bool subghz_keystore_raw_encrypted_save(
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const char* input_file_name,
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const char* output_file_name,
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uint8_t* iv) {
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bool encrypted = false;
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uint32_t version;
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FuriString* filetype;
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filetype = furi_string_alloc();
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SubGhzKeystoreEncryption encryption;
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Storage* storage = furi_record_open(RECORD_STORAGE);
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char* encrypted_line = malloc(SUBGHZ_KEYSTORE_FILE_ENCRYPTED_LINE_SIZE);
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FlipperFormat* input_flipper_format = flipper_format_file_alloc(storage);
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do {
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if(!flipper_format_file_open_existing(input_flipper_format, input_file_name)) {
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FURI_LOG_E(TAG, "Unable to open file for read: %s", input_file_name);
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break;
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}
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if(!flipper_format_read_header(input_flipper_format, filetype, &version)) {
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FURI_LOG_E(TAG, "Missing or incorrect header");
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break;
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}
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if(!flipper_format_read_uint32(
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input_flipper_format, "Encryption", (uint32_t*)&encryption, 1)) {
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FURI_LOG_E(TAG, "Missing encryption type");
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break;
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}
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if(strcmp(furi_string_get_cstr(filetype), SUBGHZ_KEYSTORE_FILE_RAW_TYPE) != 0 ||
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version != SUBGHZ_KEYSTORE_FILE_VERSION) {
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FURI_LOG_E(TAG, "Type or version mismatch");
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break;
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}
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if(encryption != SubGhzKeystoreEncryptionNone) {
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FURI_LOG_E(TAG, "Already encryption");
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break;
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}
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Stream* input_stream = flipper_format_get_raw_stream(input_flipper_format);
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FlipperFormat* output_flipper_format = flipper_format_file_alloc(storage);
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if(!flipper_format_file_open_always(output_flipper_format, output_file_name)) {
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FURI_LOG_E(TAG, "Unable to open file for write: %s", output_file_name);
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break;
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}
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if(!flipper_format_write_header_cstr(
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output_flipper_format,
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furi_string_get_cstr(filetype),
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SUBGHZ_KEYSTORE_FILE_VERSION)) {
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FURI_LOG_E(TAG, "Unable to add header");
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break;
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}
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uint32_t encryption = SubGhzKeystoreEncryptionAES256;
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if(!flipper_format_write_uint32(output_flipper_format, "Encryption", &encryption, 1)) {
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FURI_LOG_E(TAG, "Unable to add Encryption");
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break;
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}
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if(!flipper_format_write_hex(output_flipper_format, "IV", iv, 16)) {
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FURI_LOG_E(TAG, "Unable to add IV");
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break;
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}
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if(!flipper_format_write_string_cstr(output_flipper_format, "Encrypt_data", "RAW")) {
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FURI_LOG_E(TAG, "Unable to add Encrypt_data");
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break;
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}
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subghz_keystore_mess_with_iv(iv);
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if(!furi_hal_crypto_store_load_key(SUBGHZ_KEYSTORE_FILE_ENCRYPTION_KEY_SLOT, iv)) {
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FURI_LOG_E(TAG, "Unable to load encryption key");
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break;
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}
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Stream* output_stream = flipper_format_get_raw_stream(output_flipper_format);
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uint8_t buffer[FILE_BUFFER_SIZE];
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bool result = true;
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size_t ret = 0;
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furi_assert(FILE_BUFFER_SIZE % 16 == 0);
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//skip the end of the previous line "\n"
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stream_read(input_stream, buffer, 1);
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do {
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memset(buffer, 0, FILE_BUFFER_SIZE);
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ret = stream_read(input_stream, buffer, FILE_BUFFER_SIZE);
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if(ret == 0) {
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break;
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}
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for(uint16_t i = 0; i < FILE_BUFFER_SIZE - 1; i += 2) {
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uint8_t hi_nibble = 0;
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uint8_t lo_nibble = 0;
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hex_char_to_hex_nibble(buffer[i], &hi_nibble);
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hex_char_to_hex_nibble(buffer[i + 1], &lo_nibble);
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|
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];
|
|
}
|
|
stream_write_cstring(output_stream, encrypted_line);
|
|
|
|
} while(result);
|
|
|
|
flipper_format_free(output_flipper_format);
|
|
|
|
furi_hal_crypto_store_unload_key(SUBGHZ_KEYSTORE_FILE_ENCRYPTION_KEY_SLOT);
|
|
|
|
if(!result) break;
|
|
|
|
encrypted = true;
|
|
} while(0);
|
|
|
|
flipper_format_free(input_flipper_format);
|
|
|
|
free(encrypted_line);
|
|
|
|
furi_record_close(RECORD_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;
|
|
|
|
FuriString* str_temp;
|
|
str_temp = furi_string_alloc();
|
|
|
|
Storage* storage = furi_record_open(RECORD_STORAGE);
|
|
char* decrypted_line = malloc(SUBGHZ_KEYSTORE_FILE_DECRYPTED_LINE_SIZE);
|
|
|
|
FlipperFormat* flipper_format = flipper_format_file_alloc(storage);
|
|
do {
|
|
if(!flipper_format_file_open_existing(flipper_format, file_name)) {
|
|
FURI_LOG_E(TAG, "Unable to open file for read: %s", file_name);
|
|
break;
|
|
}
|
|
if(!flipper_format_read_header(flipper_format, str_temp, &version)) {
|
|
FURI_LOG_E(TAG, "Missing or incorrect header");
|
|
break;
|
|
}
|
|
if(!flipper_format_read_uint32(flipper_format, "Encryption", (uint32_t*)&encryption, 1)) {
|
|
FURI_LOG_E(TAG, "Missing encryption type");
|
|
break;
|
|
}
|
|
|
|
if(strcmp(furi_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;
|
|
}
|
|
|
|
Stream* stream = flipper_format_get_raw_stream(flipper_format);
|
|
if(encryption != SubGhzKeystoreEncryptionAES256) {
|
|
FURI_LOG_E(TAG, "Unknown encryption");
|
|
break;
|
|
}
|
|
|
|
if(offset < 16) {
|
|
if(!flipper_format_read_hex(flipper_format, "IV", iv, 16)) {
|
|
FURI_LOG_E(TAG, "Missing IV");
|
|
break;
|
|
}
|
|
subghz_keystore_mess_with_iv(iv);
|
|
}
|
|
|
|
if(!flipper_format_read_string(flipper_format, "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);
|
|
|
|
uint8_t buffer[bufer_size];
|
|
size_t ret = 0;
|
|
bool decrypted = true;
|
|
//skip the end of the previous line "\n"
|
|
stream_read(stream, buffer, 1);
|
|
|
|
size_t size = stream_size(stream);
|
|
size -= stream_tell(stream);
|
|
if(size < (offset * 2 + len * 2)) {
|
|
FURI_LOG_E(TAG, "Seek position exceeds file size");
|
|
break;
|
|
}
|
|
|
|
if(offset >= 16) {
|
|
stream_seek(stream, ((offset / 16) - 1) * 32, StreamOffsetFromCurrent);
|
|
ret = stream_read(stream, 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 = stream_read(stream, 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_format_free(flipper_format);
|
|
|
|
furi_record_close(RECORD_STORAGE);
|
|
|
|
free(decrypted_line);
|
|
|
|
furi_string_free(str_temp);
|
|
|
|
return result;
|
|
}
|