d92b0a82cc
"A long time ago in a galaxy far, far away...." we started NFC subsystem refactoring. Starring: - @gornekich - NFC refactoring project lead, architect, senior developer - @gsurkov - architect, senior developer - @RebornedBrain - senior developer Supporting roles: - @skotopes, @DrZlo13, @hedger - general architecture advisors, code review - @Astrrra, @doomwastaken, @Hellitron, @ImagineVagon333 - quality assurance Special thanks: @bettse, @pcunning, @nxv, @noproto, @AloneLiberty and everyone else who has been helping us all this time and contributing valuable knowledges, ideas and source code.
117 lines
3.8 KiB
C
117 lines
3.8 KiB
C
/* myki.c - Parser for myki cards (Melbourne, Australia).
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*
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* Based on the code by Emily Trau (https://github.com/emilytrau)
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* Original pull request URL: https://github.com/flipperdevices/flipperzero-firmware/pull/2326
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* Reference: https://github.com/metrodroid/metrodroid/wiki/Myki
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*/
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#include "nfc_supported_card_plugin.h"
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#include <flipper_application/flipper_application.h>
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#include <lib/nfc/protocols/mf_desfire/mf_desfire.h>
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static const MfDesfireApplicationId myki_app_id = {.data = {0x00, 0x11, 0xf2}};
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static const MfDesfireFileId myki_file_id = 0x0f;
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static uint8_t myki_calculate_luhn(uint64_t number) {
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// https://en.wikipedia.org/wiki/Luhn_algorithm
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// Drop existing check digit to form payload
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uint64_t payload = number / 10;
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int sum = 0;
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int position = 0;
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while(payload > 0) {
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int digit = payload % 10;
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if(position % 2 == 0) {
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digit *= 2;
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}
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if(digit > 9) {
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digit = (digit / 10) + (digit % 10);
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}
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sum += digit;
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payload /= 10;
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position++;
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}
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return (10 - (sum % 10)) % 10;
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}
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static bool myki_parse(const NfcDevice* device, FuriString* parsed_data) {
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furi_assert(device);
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furi_assert(parsed_data);
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bool parsed = false;
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do {
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const MfDesfireData* data = nfc_device_get_data(device, NfcProtocolMfDesfire);
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const MfDesfireApplication* app = mf_desfire_get_application(data, &myki_app_id);
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if(app == NULL) break;
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typedef struct {
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uint32_t top;
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uint32_t bottom;
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} MykiFile;
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const MfDesfireFileSettings* file_settings =
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mf_desfire_get_file_settings(app, &myki_file_id);
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if(file_settings == NULL || file_settings->type != MfDesfireFileTypeStandard ||
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file_settings->data.size < sizeof(MykiFile))
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break;
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const MfDesfireFileData* file_data = mf_desfire_get_file_data(app, &myki_file_id);
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if(file_data == NULL) break;
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const MykiFile* myki_file = simple_array_cget_data(file_data->data);
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// All myki card numbers are prefixed with "308425"
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if(myki_file->top != 308425UL) break;
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// Card numbers are always 15 digits in length
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if(myki_file->bottom < 10000000UL || myki_file->bottom >= 100000000UL) break;
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uint64_t card_number = myki_file->top * 1000000000ULL + myki_file->bottom * 10UL;
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// Stored card number doesn't include check digit
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card_number += myki_calculate_luhn(card_number);
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furi_string_set(parsed_data, "\e#myki\n");
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// Stylise card number according to the physical card
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char card_string[20];
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snprintf(card_string, sizeof(card_string), "%llu", card_number);
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// Digit count in each space-separated group
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static const uint8_t digit_count[] = {1, 5, 4, 4, 1};
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for(uint32_t i = 0, k = 0; i < COUNT_OF(digit_count); k += digit_count[i++]) {
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for(uint32_t j = 0; j < digit_count[i]; ++j) {
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furi_string_push_back(parsed_data, card_string[j + k]);
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}
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furi_string_push_back(parsed_data, ' ');
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}
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parsed = true;
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} while(false);
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return parsed;
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}
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/* Actual implementation of app<>plugin interface */
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static const NfcSupportedCardsPlugin myki_plugin = {
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.protocol = NfcProtocolMfDesfire,
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.verify = NULL,
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.read = NULL,
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.parse = myki_parse,
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};
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/* Plugin descriptor to comply with basic plugin specification */
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static const FlipperAppPluginDescriptor myki_plugin_descriptor = {
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.appid = NFC_SUPPORTED_CARD_PLUGIN_APP_ID,
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.ep_api_version = NFC_SUPPORTED_CARD_PLUGIN_API_VERSION,
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.entry_point = &myki_plugin,
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};
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/* Plugin entry point - must return a pointer to const descriptor */
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const FlipperAppPluginDescriptor* myki_plugin_ep() {
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return &myki_plugin_descriptor;
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}
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