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| author | EmilienCourt <emilien.court@telecomnancy.net> | 2023-01-14 17:58:03 +0100 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2023-01-14 11:58:03 -0500 |
| commit | 9ebea46300bd1bc4e3ba51b1c7915e3ba42c471a (patch) | |
| tree | 013dfc56976b23c31e5501c9cc31f8ca0aa1c2c2 /movement/lib/TOTP/TOTP.c | |
| parent | 2e618850702bc9a55b1a530c89ab928c2d09501c (diff) | |
| download | Sensor-Watch-9ebea46300bd1bc4e3ba51b1c7915e3ba42c471a.tar.gz Sensor-Watch-9ebea46300bd1bc4e3ba51b1c7915e3ba42c471a.tar.bz2 Sensor-Watch-9ebea46300bd1bc4e3ba51b1c7915e3ba42c471a.zip | |
totp : rework and add SHA256/512 (#151)
* totp : rework and add SHA256/512
* totp : comment code
* totp : fix SHA224/SHA384 and examples
* totp : fix bug in totp_face_lfs
* totp : init_totp_record to SHA1
* totp : move TOTP-MCU to TOTP, update README and example
* totp : SHAX, use size_t n instead of harcoded 8
* clarify what to put in TOTP face
Co-authored-by: Emilien <Emilien>
Co-authored-by: joeycastillo <joeycastillo@utexas.edu>
Diffstat (limited to 'movement/lib/TOTP/TOTP.c')
| -rw-r--r-- | movement/lib/TOTP/TOTP.c | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/movement/lib/TOTP/TOTP.c b/movement/lib/TOTP/TOTP.c new file mode 100644 index 00000000..7f601337 --- /dev/null +++ b/movement/lib/TOTP/TOTP.c @@ -0,0 +1,69 @@ +#include "TOTP.h"
+#include "sha1.h"
+#include "sha256.h"
+#include "sha512.h"
+#include <stdio.h>
+
+uint8_t* _hmacKey;
+uint8_t _keyLength;
+uint8_t _timeZoneOffset;
+uint32_t _timeStep;
+hmac_alg _algorithm;
+
+// Init the library with the private key, its length, the timeStep duration and the algorithm that should be used
+void TOTP(uint8_t* hmacKey, uint8_t keyLength, uint32_t timeStep, hmac_alg algorithm) {
+ _hmacKey = hmacKey;
+ _keyLength = keyLength;
+ _timeStep = timeStep;
+ _algorithm = algorithm;
+}
+
+void setTimezone(uint8_t timezone){
+ _timeZoneOffset = timezone;
+}
+
+static 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));
+
+ switch(_algorithm){
+ case SHA1:
+ return(TOTP_HMAC_SHA1(_hmacKey, _keyLength, _byteArray, 8));
+ case SHA224:
+ return(TOTP_HMAC_SHA256(_hmacKey, _keyLength, _byteArray, 8, 1));
+ case SHA256:
+ return(TOTP_HMAC_SHA256(_hmacKey, _keyLength, _byteArray, 8, 0));
+ case SHA384:
+ return(TOTP_HMAC_SHA512(_hmacKey, _keyLength, _byteArray, 8, 1));
+ case SHA512:
+ return(TOTP_HMAC_SHA512(_hmacKey, _keyLength, _byteArray, 8, 0));
+ default:
+ return(0);
+ }
+}
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