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#include <stdlib.h>
#include <string.h>
#include "totp_face.h"
#include "watch.h"
#include "watch_utility.h"
#include "TOTP.h"
// Use https://cryptii.com/pipes/base32-to-hex to convert base32 to hex
// Use https://github.com/susam/mintotp to generate test codes for verification
// Available algorothms:
// SHA1 (most TOTP codes use this)
// SHA224
// SHA256
// SHA384
// SHA512
////////////////////////////////////////////////////////////////////////////////
// Enter your TOTP key data below
static const uint8_t num_keys = 2;
static uint8_t keys[] = {
0x48, 0x65, 0x6c, 0x6c, 0x6f, 0x21, 0xde, 0xad, 0xbe, 0xef, // 1 - JBSWY3DPEHPK3PXP
0x48, 0x65, 0x6c, 0x6c, 0x6f, 0x21, 0xde, 0xad, 0xbe, 0xef, // 2 - JBSWY3DPEHPK3PXP
};
static const uint8_t key_sizes[] = {
10,
10,
};
static const uint32_t timesteps[] = {
30,
30,
};
static const char labels[][2] = {
{ '2', 'F' },
{ 'A', 'C' },
};
static const hmac_alg algorithms[] = {
SHA1,
SHA1,
};
// END OF KEY DATA.
////////////////////////////////////////////////////////////////////////////////
void totp_face_setup(movement_settings_t *settings, uint8_t watch_face_index, void ** context_ptr) {
(void) settings;
(void) watch_face_index;
if (*context_ptr == NULL) *context_ptr = malloc(sizeof(totp_state_t));
}
void totp_face_activate(movement_settings_t *settings, void *context) {
(void) settings;
memset(context, 0, sizeof(totp_state_t));
totp_state_t *totp_state = (totp_state_t *)context;
TOTP(keys, key_sizes[0], timesteps[0], algorithms[0]);
totp_state->timestamp = watch_utility_date_time_to_unix_time(watch_rtc_get_date_time(), movement_timezone_offsets[settings->bit.time_zone] * 60);
totp_state->current_code = getCodeFromTimestamp(totp_state->timestamp);
}
bool totp_face_loop(movement_event_t event, movement_settings_t *settings, void *context) {
(void) settings;
totp_state_t *totp_state = (totp_state_t *)context;
char buf[14];
uint8_t valid_for;
div_t result;
uint8_t index = totp_state->current_index;
switch (event.event_type) {
case EVENT_TICK:
totp_state->timestamp++;
// fall through
case EVENT_ACTIVATE:
result = div(totp_state->timestamp, timesteps[index]);
if (result.quot != totp_state->steps) {
totp_state->current_code = getCodeFromTimestamp(totp_state->timestamp);
totp_state->steps = result.quot;
}
valid_for = timesteps[index] - result.rem;
sprintf(buf, "%c%c%2d%06lu", labels[index][0], labels[index][1], valid_for, totp_state->current_code);
watch_display_string(buf, 0);
break;
case EVENT_TIMEOUT:
movement_move_to_face(0);
break;
case EVENT_ALARM_BUTTON_UP:
if (index + 1 < num_keys) {
totp_state->current_key_offset += key_sizes[index];
totp_state->current_index++;
} else {
// wrap around to first key
totp_state->current_key_offset = 0;
totp_state->current_index = 0;
}
TOTP(keys + totp_state->current_key_offset, key_sizes[totp_state->current_index], timesteps[totp_state->current_index], algorithms[totp_state->current_index]);
break;
case EVENT_ALARM_BUTTON_DOWN:
case EVENT_ALARM_LONG_PRESS:
break;
default:
movement_default_loop_handler(event, settings);
break;
}
return true;
}
void totp_face_resign(movement_settings_t *settings, void *context) {
(void) settings;
(void) context;
}
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