61 lines
1.7 KiB
JavaScript
61 lines
1.7 KiB
JavaScript
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import { getHOTP } from "./OTPGenerator.js"
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"use bigint"
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/**
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* TOTP instance
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*/
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export class TOTP{
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/**
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*
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* @param {string} secret base32 encoded string
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* @param {string} issuer issuer of TOTP
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* @param {number} [digits=6] number of digits in OTP token
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* @param {number} [fetchTime=30] period of token in seconds
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* @param {number} [timeOffset=0] time offset for token in seconds
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* @param {string} [hashType='SHA-1'] type of hash (more in jsSHA documentation)
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*/
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constructor(secret,
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issuer,
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digits = 6,
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fetchTime = 30,
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timeOffset = 0,
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hashType = 'SHA-1')
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{
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this.secret = secret
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this.issuer = issuer
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this.digits = digits
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this.fetchTime = fetchTime
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this.timeOffset = timeOffset
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this.hashType = hashType
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}
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/**
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*
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* @param {number} time time for counter (default unix time epoch)
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* @returns OTP instance
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*/
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getOTP(time = Date.now()){
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const unixTime = (time / 1000 + this.timeOffset) / this.fetchTime
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const otp = getHOTP(Math.floor(unixTime), this.secret, this.digits)
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const expireTime = time +
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(this.fetchTime -
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(time / 1000 + this.timeOffset) %
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this.fetchTime) * 1000
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return new OTP(otp, expireTime)
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}
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}
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/**
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* Class for TOTP.getOTP result
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*/
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export class OTP{
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/**
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*
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* @param {string} otp OTP string
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* @param {number} expireTime time in seconds to reset OTP
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*/
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constructor(otp, expireTime)
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{
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this.otp = otp
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this.expireTime = expireTime
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}
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}
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