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import { HmacSHA1, enc } from 'crypto-js';
import _ from 'lodash';
import { createToken } from '../token-generator/token-generator.service';
export {
generateHOTP,
hexToBytes,
verifyHOTP,
generateTOTP,
verifyTOTP,
buildKeyUri,
generateSecret,
base32toHex,
getCounterFromTime,
};
function hexToBytes(hex: string) {
return (hex.match(/.{1,2}/g) ?? []).map(char => Number.parseInt(char, 16));
}
function computeHMACSha1(message: string, key: string) {
return HmacSHA1(enc.Hex.parse(message), enc.Hex.parse(base32toHex(key))).toString(enc.Hex);
}
function base32toHex(base32: string) {
const base32Chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ234567';
const bits = base32
.toUpperCase() // Since base 32, we coerce lowercase to uppercase
.replace(/=+$/, '')
.split('')
.map(value => base32Chars.indexOf(value).toString(2).padStart(5, '0'))
.join('');
const hex = (bits.match(/.{1,8}/g) ?? []).map(chunk => Number.parseInt(chunk, 2).toString(16).padStart(2, '0')).join('');
return hex;
}
function generateHOTP({ key, counter = 0 }: { key: string; counter?: number }) {
// Compute HMACdigest
const digest = computeHMACSha1(counter.toString(16).padStart(16, '0'), key);
// Get byte array
const bytes = hexToBytes(digest);
// Truncate
const offset = bytes[19] & 0xF;
const v
= ((bytes[offset] & 0x7F) << 24)
| ((bytes[offset + 1] & 0xFF) << 16)
| ((bytes[offset + 2] & 0xFF) << 8)
| (bytes[offset + 3] & 0xFF);
const code = String(v % 1000000).padStart(6, '0');
return code;
}
function verifyHOTP({
token,
key,
window = 0,
counter = 0,
}: {
token: string
key: string
window?: number
counter?: number
}) {
for (let i = counter - window; i <= counter + window; ++i) {
if (generateHOTP({ key, counter: i }) === token) {
return true;
}
}
return false;
}
function getCounterFromTime({ now, timeStep }: { now: number; timeStep: number }) {
return Math.floor(now / 1000 / timeStep);
}
function generateTOTP({ key, now = Date.now(), timeStep = 30 }: { key: string; now?: number; timeStep?: number }) {
const counter = getCounterFromTime({ now, timeStep });
return generateHOTP({ key, counter });
}
function verifyTOTP({
key,
token,
window = 0,
now = Date.now(),
timeStep = 30,
}: {
token: string
key: string
window?: number
now?: number
timeStep?: number
}) {
const counter = getCounterFromTime({ now, timeStep });
return verifyHOTP({ token, key, window, counter });
}
function buildKeyUri({
secret,
app = 'IT-Tools',
account = 'demo-user',
algorithm = 'SHA1',
digits = 6,
period = 30,
}: {
secret: string
app?: string
account?: string
algorithm?: string
digits?: number
period?: number
}) {
const params = {
issuer: app,
secret,
algorithm,
digits,
period,
};
const paramsString = _(params)
.map((value, key) => `${encodeURIComponent(key)}=${encodeURIComponent(value)}`)
.join('&');
return `otpauth://totp/${encodeURIComponent(app)}:${encodeURIComponent(account)}?${paramsString}`;
}
function generateSecret() {
return createToken({ length: 16, alphabet: 'ABCDEFGHIJKLMNOPQRSTUVWXYZ234567' });
}
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