b8de35658f
* Put something on screen * Use the 32bit watch_date_time repr to pass from JS * Implement periodic callbacks * Clear display on enabling * Hook up watch_set_led_color() to SVG (green-only) * Make debug output full-width * Remove default Emscripten canvas * Implement sleep and button clicks * Fix time zone conversion bug in beats-time app * Clean up warnings * Fix pin levels * Set time zone to browser value (if available) * Add basic backup data saving * Silence format specifier warnings in both targets * Remove unnecessary, copied files * Use RTC pointer to clear callbacks (if available) * Use preprocessor define to avoid hardcoding MOVEMENT_NUM_FACES * Change each face to const preprocessor definition * Remove Intl.DateTimeFormat usage * Update shell.html title, header * Add touch start/end event handlers on SVG buttons * Update shell.html * Update folder structure (shared, simulator, hardware under watch-library) * Tease out shared components from watch_slcd * Clean up simulator watch_slcd.c inline JS calls * Fix missing newlines at end of file * Add simulator warnings (except format, unused-paremter) * Implement remaining watch_rtc functions * Fix button bug on mouse down then drag out * Implement remaining watch_slcd functions * Link keyboard events to buttons (for keys A, L, M) * Rewrite event handling (mouse, touch, keyboard) in C * Set explicit text UTF-8 charset in shell.html * Address PR comments * Remove unused directories from include paths
TOTP Pure C Library for ALL MCU
Library to generate Time-based One-Time Passwords.
Implements the Time-based One-Time Password algorithm specified in RFC 6238. Supports different time steps and is compatible with tokens that use the same standard (including software ones, like the Google Authenticator app).
Tested on MCUs: MSP430, RP2040
Installation & usage:
First include header to your file
#include <totp.h>
After included, define key ex. Key is MyLegoDoor
- Note: The format of hmacKey is array of hexadecimal bytes.
- Most websites provide the key encoded in base32 - RFC3548/RFC4648, either upper or lower case. You can use this site to convert the base32 string to hex (make sure you upcase it first if it's lowercase and remove all whitespaces).
uint8_t hmacKey[] = {0x4d, 0x79, 0x4c, 0x65, 0x67, 0x6f, 0x44, 0x6f, 0x6f, 0x72}; // Secret key
Instantiate the TOTP class by providing the secret hmacKey, the length of the hmacKey and the Timestep between codes.
TOTP(hmacKey, 10, 30); // Secret key, Secret key length, Timestep (30s)
Use the getCodeFromTimestamp() function to get a TOTP from a unix epoch timestamp
uint32_t newCode = getCodeFromTimestamp(1557414000); // Current timestamp since Unix epoch in seconds
Or getCodeFromTimeStruct() if you want to get a TOTP from a tm struct (Time Struct in C),
struct tm datetime;
datetime.tm_hour = 9;
datetime.tm_min = 0;
datetime.tm_sec = 0;
datetime.tm_mday = 13;
datetime.tm_mon = 5;
datetime.tm_year = 2019;
uint32_t newCode = getCodeFromTimeStruct(datetime);
If the provided unix timestamp isn't in UTC±0, use setTimezone() before getCodeFromTimestamp() or getCodeFromTimeStruct() to offset the time.
setTimezone(9); // Set timezone +9 Japan
You can see an example in blink.c
Thanks to:
- Jose Damico, https://github.com/damico/ARDUINO-OATH-TOKEN
- Peter Knight, https://github.com/Cathedrow/Cryptosuite
- Maniacbug, https://github.com/maniacbug/Cryptosuite
- lucadentella, https://github.com/lucadentella/TOTP-Arduino