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add totp generator code

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Signed-off-by: Avinal Kumar <avinal.xlvii@gmail.com>
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Morumotto
2022-10-05 01:01:33 +05:30
parent b08233b09b
commit eed44ab1a9
5 changed files with 481 additions and 0 deletions
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// SPDX-License-Identifier: BSD-3-Clause
// SPDX-FileCopyrightText: 2022 Avinal Kumar <avinal.xlvii@gmail.com>
#include <stdio.h>
#include <algorithm>
#include <cstring>
#include <ctime>
#include <string>
#include "badger2040.hpp"
#include "common/pimoroni_common.hpp"
#include "pico/platform.h"
#include "pico/stdlib.h"
#include "pico/time.h"
#include "topt.h"
using namespace pimoroni;
Badger2040 badger;
constexpr int WIDTH = 296;
constexpr int HEIGHT = 128;
constexpr long IST_OFFSET = 19800;
std::string time(const long& st) {
// Add offset for IST
std::time_t t = st;
std::tm* tm_gmt = std::gmtime(&t);
// return time as string in HH:MM:SS format
return std::to_string(tm_gmt->tm_hour) + ":" +
std::to_string(tm_gmt->tm_min) + ":" + std::to_string(tm_gmt->tm_sec) +
" IST";
}
std::string get_totp(const long& st) {
// echo "@vinal47Kbadger2FA" | base32
// IB3GS3TBNQ2DOS3CMFSGOZLSGJDECCQ=
uint8_t hmacKey[] = {0x40, 0x76, 0x69, 0x6e, 0x61, 0x6c, 0x34,
0x37, 0x4b, 0x62, 0x61, 0x64, 0x67, 0x65,
0x72, 0x32, 0x46, 0x41, 0x0a};
TOTP(hmacKey, 19, 10);
auto code = std::to_string(getCodeFromTimestamp(st));
if (code.length() < 6) {
code = std::string(6 - code.length(), '0') + code;
}
return code;
}
void draw(const std::string& code, const std::string& time) {
int32_t hms_width = badger.measure_text(code, 1.8f);
int hms_offset = WIDTH / 2 - hms_width / 2;
int32_t time_width = badger.measure_text(time, 0.7f);
int time_offset = WIDTH / 2 - time_width / 2;
badger.pen(15);
badger.clear();
badger.pen(0);
badger.thickness(5);
badger.text(code, hms_offset, 54, 1.8f);
badger.thickness(2);
badger.text(time, time_offset, 110, 0.7f);
badger.update();
}
void draw_timer(int seconds) {
while (seconds) {
badger.pen(15);
badger.clear();
badger.pen(0);
badger.thickness(2);
badger.text(std::to_string(seconds), 143, 8, 0.6f);
badger.partial_update(140, 0, 16, 16);
sleep_ms(1000);
seconds--;
}
}
void init_draw(const std::string& message) {
int32_t msg_width = badger.measure_text(message, 0.7f);
int msg_offset = WIDTH / 2 - msg_width / 2;
badger.pen(15);
badger.clear();
badger.pen(0);
badger.thickness(3);
badger.font("sans");
badger.text(message, msg_offset, 65, 0.7f);
badger.update();
}
int main() {
stdio_init_all();
sleep_ms(20);
// Unix time starts on 1st January 1970
long start_time;
badger.init();
badger.update_speed(2);
init_draw("Waiting for RTC sync...");
scanf("%d", &start_time);
init_draw("RTC sync complete :)");
while (true) {
// Increase unix time by 1 second
draw(get_totp(start_time), time(start_time + IST_OFFSET));
draw_timer(10);
badger.led(100);
start_time += 10;
badger.led(0);
}
}

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/*
MIT License
Copyright (c) 2019 Weravech
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
https://github.com/Netthaw/TOTP-MCU
*/
#include "sha1.h"
#include <string.h>
#define SHA1_K0 0x5a827999
#define SHA1_K20 0x6ed9eba1
#define SHA1_K40 0x8f1bbcdc
#define SHA1_K60 0xca62c1d6
union _buffer {
uint8_t b[BLOCK_LENGTH];
uint32_t w[BLOCK_LENGTH / 4];
} buffer;
union _state {
uint8_t b[HASH_LENGTH];
uint32_t w[HASH_LENGTH / 4];
} state;
uint8_t bufferOffset;
uint32_t byteCount;
uint8_t keyBuffer[BLOCK_LENGTH];
uint8_t innerHash[HASH_LENGTH];
uint8_t sha1InitState[] = {
0x01, 0x23, 0x45, 0x67, // H0
0x89, 0xab, 0xcd, 0xef, // H1
0xfe, 0xdc, 0xba, 0x98, // H2
0x76, 0x54, 0x32, 0x10, // H3
0xf0, 0xe1, 0xd2, 0xc3 // H4
};
void init(void) {
memcpy(state.b, sha1InitState, HASH_LENGTH);
byteCount = 0;
bufferOffset = 0;
}
uint32_t rol32(uint32_t number, uint8_t bits) {
return ((number << bits) | (uint32_t)(number >> (32 - bits)));
}
void hashBlock() {
uint8_t i;
uint32_t a, b, c, d, e, t;
a = state.w[0];
b = state.w[1];
c = state.w[2];
d = state.w[3];
e = state.w[4];
for (i = 0; i < 80; i++) {
if (i >= 16) {
t = buffer.w[(i + 13) & 15] ^ buffer.w[(i + 8) & 15] ^
buffer.w[(i + 2) & 15] ^ buffer.w[i & 15];
buffer.w[i & 15] = rol32(t, 1);
}
if (i < 20) {
t = (d ^ (b & (c ^ d))) + SHA1_K0;
} else if (i < 40) {
t = (b ^ c ^ d) + SHA1_K20;
} else if (i < 60) {
t = ((b & c) | (d & (b | c))) + SHA1_K40;
} else {
t = (b ^ c ^ d) + SHA1_K60;
}
t += rol32(a, 5) + e + buffer.w[i & 15];
e = d;
d = c;
c = rol32(b, 30);
b = a;
a = t;
}
state.w[0] += a;
state.w[1] += b;
state.w[2] += c;
state.w[3] += d;
state.w[4] += e;
}
void addUncounted(uint8_t data) {
buffer.b[bufferOffset ^ 3] = data;
bufferOffset++;
if (bufferOffset == BLOCK_LENGTH) {
hashBlock();
bufferOffset = 0;
}
}
void write(uint8_t data) {
++byteCount;
addUncounted(data);
return;
}
void writeArray(uint8_t* buffer, uint8_t size) {
while (size--) {
write(*buffer++);
}
}
void pad() {
// Implement SHA-1 padding (fips180-2 <20><>5.1.1)
// Pad with 0x80 followed by 0x00 until the end of the block
addUncounted(0x80);
while (bufferOffset != 56) addUncounted(0x00);
// Append length in the last 8 bytes
addUncounted(0); // We're only using 32 bit lengths
addUncounted(0); // But SHA-1 supports 64 bit lengths
addUncounted(0); // So zero pad the top bits
addUncounted(byteCount >> 29); // Shifting to multiply by 8
addUncounted(byteCount >> 21); // as SHA-1 supports bitstreams as well as
addUncounted(byteCount >> 13); // byte.
addUncounted(byteCount >> 5);
addUncounted(byteCount << 3);
}
uint8_t* result(void) {
// Pad to complete the last block
pad();
// Swap byte order back
uint8_t i;
for (i = 0; i < 5; i++) {
uint32_t a, b;
a = state.w[i];
b = a << 24;
b |= (a << 8) & 0x00ff0000;
b |= (a >> 8) & 0x0000ff00;
b |= a >> 24;
state.w[i] = b;
}
// Return pointer to hash (20 characters)
return state.b;
}
#define HMAC_IPAD 0x36
#define HMAC_OPAD 0x5c
void initHmac(const uint8_t* key, uint8_t keyLength) {
uint8_t i;
memset(keyBuffer, 0, BLOCK_LENGTH);
if (keyLength > BLOCK_LENGTH) {
// Hash long keys
init();
for (; keyLength--;) write(*key++);
memcpy(keyBuffer, result(), HASH_LENGTH);
} else {
// Block length keys are used as is
memcpy(keyBuffer, key, keyLength);
}
// Start inner hash
init();
for (i = 0; i < BLOCK_LENGTH; i++) {
write(keyBuffer[i] ^ HMAC_IPAD);
}
}
uint8_t* resultHmac(void) {
uint8_t i;
// Complete inner hash
memcpy(innerHash, result(), HASH_LENGTH);
// Calculate outer hash
init();
for (i = 0; i < BLOCK_LENGTH; i++) write(keyBuffer[i] ^ HMAC_OPAD);
for (i = 0; i < HASH_LENGTH; i++) write(innerHash[i]);
return result();
}

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/*
MIT License
Copyright (c) 2019 Weravech
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
https://github.com/Netthaw/TOTP-MCU
*/
#ifndef SHA1_H
#define SHA1_H
#include <inttypes.h>
#define HASH_LENGTH 20
#define BLOCK_LENGTH 64
void init(void);
void initHmac(const uint8_t* secret, uint8_t secretLength);
uint8_t* result(void);
uint8_t* resultHmac(void);
void write(uint8_t);
void writeArray(uint8_t* buffer, uint8_t size);
#endif // SHA1_H

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/*
MIT License
Copyright (c) 2019 Weravech
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
https://github.com/Netthaw/TOTP-MCU
*/
#include "sha1.h"
#include "topt.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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/*
MIT License
Copyright (c) 2019 Weravech
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
https://github.com/Netthaw/TOTP-MCU
*/
#ifndef TOPT_H
#define TOPT_H
#include <inttypes.h>
#include "time.h"
void TOTP(uint8_t* hmacKey, uint8_t keyLength, uint32_t timeStep);
void setTimezone(uint8_t timezone);
uint32_t getCodeFromTimestamp(uint32_t timeStamp);
uint32_t getCodeFromTimeStruct(struct tm time);
uint32_t getCodeFromSteps(uint32_t steps);
#endif // TOPT_H