feat: changed TOTP and base32 library to self-writed special for quick-js, fixed BigInt incompatibility

lib/totp-quickjs/OTPGenerator.js

@@ -0,0 +1,54 @@
+import { decode } from "./base32decoder.js";
+import jsSHA from "jssha";
+"use bigint"
+/**
+ * get HOTP based on counter
+ * @param {BigInt} counter BigInt counter of HOTP
+ * @param {string} secret base32 encoded string 
+ * @param {number} [digits=6] number of digits in OTP token
+ * @param {string} [hashType='SHA-1'] type of hash (more in jsSHA documentation)
+ * @returns HOTP string
+ */
+export function getHOTP(counter, secret, digits = 6, hashType = 'SHA-1'){
+
+    //Stage 1: Prepare data
+    const rawDataCounter = new DataView(new ArrayBuffer(8))
+    rawDataCounter.setUint32(0, counter >> 32)
+    rawDataCounter.setUint32(4, counter)
+    const bCounter = new Uint8Array(rawDataCounter.buffer)
+
+    const bSecret = new Uint8Array(decode(secret).match(/.{1,2}/g).map(chunk => parseInt(chunk, 16))); //confirmed
+    
+    //Stage 2: Hash data
+    const jssha = new jsSHA(hashType, 'UINT8ARRAY')
+    jssha.setHMACKey(bSecret, 'UINT8ARRAY')
+    jssha.update(bCounter)
+    const hmacResult = jssha.getHMAC('UINT8ARRAY') //confirmed
+    
+    //Stage 3: Dynamic truncate
+    const offsetB = hmacResult[19] & 0xf;
+    const P = hmacResult.slice(offsetB, offsetB + 4)
+    P[0] = P[0] & 0x7f;
+    
+    //Stage 4: Format string
+    let res = (new DataView(P.buffer).getInt32(0) % Math.pow(10, digits)).toString()
+    while(res.length < digits)
+        res = '0' + res;
+    return res;
+}
+
+/**
+ * get OTP based on current time
+ * @param {string} secret base32 encoded string 
+ * @param {number} [digits=6] digits in OTP
+ * @param {number} [time=Date.now()] time for counter (default unix time epoch)
+ * @param {number} [fetchTime=30] period of token in seconds
+ * @param {number} [timeOffset=0] time offset for token in seconds 
+ * @param {string} [hashType='SHA-1'] type of hash (more in jsSHA documentation)
+ * @returns TOTP string
+ */
+export function getTOTP(secret, digits = 6, time = Date.now(), fetchTime = 30, timeOffset = 0, hashType = 'SHA-1')
+{
+    const unixTime = Math.round((time / 1000 + timeOffset) / fetchTime)
+    return getHOTP(BigInt(unixTime), secret, digits)
+}