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| author | Wesley Ellis <tahnok@gmail.com> | 2021-11-23 21:37:54 -0500 |
|---|---|---|
| committer | Wesley Ellis <tahnok@gmail.com> | 2021-11-23 21:40:27 -0500 |
| commit | 4a0ff5577363a1bd315693b41f448e3774de9e34 (patch) | |
| tree | 1f114cf2d110b431b750ab073713d52dc5d1077d /movement/lib/TOTP-MCU/TOTP.c | |
| parent | 121e6fd165a03f9249100e73bdf658e545e10d25 (diff) | |
| download | Sensor-Watch-4a0ff5577363a1bd315693b41f448e3774de9e34.tar.gz Sensor-Watch-4a0ff5577363a1bd315693b41f448e3774de9e34.tar.bz2 Sensor-Watch-4a0ff5577363a1bd315693b41f448e3774de9e34.zip | |
Properly vendor TOTP-MCU temporarily
Diffstat (limited to 'movement/lib/TOTP-MCU/TOTP.c')
| m--------- | movement/lib/TOTP-MCU | 0 | ||||
| -rw-r--r-- | movement/lib/TOTP-MCU/TOTP.c | 69 |
2 files changed, 69 insertions, 0 deletions
diff --git a/movement/lib/TOTP-MCU b/movement/lib/TOTP-MCU deleted file mode 160000 -Subproject 646474a8757e1fca490792e81082b2ad89b966a diff --git a/movement/lib/TOTP-MCU/TOTP.c b/movement/lib/TOTP-MCU/TOTP.c new file mode 100644 index 00000000..d977d06e --- /dev/null +++ b/movement/lib/TOTP-MCU/TOTP.c @@ -0,0 +1,69 @@ +#include "TOTP.h"
+#include "sha1.h"
+
+uint8_t* _hmacKey;
+uint8_t _keyLength;
+uint8_t _timeZoneOffset;
+uint32_t _timeStep;
+
+// Init the library with the private key, its length and the timeStep duration
+void TOTP(uint8_t* hmacKey, uint8_t keyLength, uint32_t timeStep) {
+ _hmacKey = hmacKey;
+ _keyLength = keyLength;
+ _timeStep = timeStep;
+}
+
+void setTimezone(uint8_t timezone){
+ _timeZoneOffset = timezone;
+}
+
+uint32_t TimeStruct2Timestamp(struct tm time){
+ //time.tm_mon -= 1;
+ //time.tm_year -= 1900;
+ return mktime(&(time)) - (_timeZoneOffset * 3600) - 2208988800;
+}
+
+// Generate a code, using the timestamp provided
+uint32_t getCodeFromTimestamp(uint32_t timeStamp) {
+ uint32_t steps = timeStamp / _timeStep;
+ return getCodeFromSteps(steps);
+}
+
+// Generate a code, using the timestamp provided
+uint32_t getCodeFromTimeStruct(struct tm time) {
+ return getCodeFromTimestamp(TimeStruct2Timestamp(time));
+}
+
+// Generate a code, using the number of steps provided
+uint32_t getCodeFromSteps(uint32_t steps) {
+ // STEP 0, map the number of steps in a 8-bytes array (counter value)
+ uint8_t _byteArray[8];
+ _byteArray[0] = 0x00;
+ _byteArray[1] = 0x00;
+ _byteArray[2] = 0x00;
+ _byteArray[3] = 0x00;
+ _byteArray[4] = (uint8_t)((steps >> 24) & 0xFF);
+ _byteArray[5] = (uint8_t)((steps >> 16) & 0xFF);
+ _byteArray[6] = (uint8_t)((steps >> 8) & 0XFF);
+ _byteArray[7] = (uint8_t)((steps & 0XFF));
+
+ // STEP 1, get the HMAC-SHA1 hash from counter and key
+ initHmac(_hmacKey, _keyLength);
+ writeArray(_byteArray, 8);
+ uint8_t* _hash = resultHmac();
+
+ // STEP 2, apply dynamic truncation to obtain a 4-bytes string
+ uint32_t _truncatedHash = 0;
+ uint8_t _offset = _hash[20 - 1] & 0xF;
+ uint8_t j;
+ for (j = 0; j < 4; ++j) {
+ _truncatedHash <<= 8;
+ _truncatedHash |= _hash[_offset + j];
+ }
+
+ // STEP 3, compute the OTP value
+ _truncatedHash &= 0x7FFFFFFF; //Disabled
+ _truncatedHash %= 1000000;
+
+ return _truncatedHash;
+}
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