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65 lines
2.5 KiB
JavaScript
65 lines
2.5 KiB
JavaScript
const aesjs = require('./aes-64bit')
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const crc = require('node-crc')
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const crypto = require("crypto")
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//console.log(crypto.getCiphers())
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function randomIntInc(low, high) {
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return Math.floor(Math.random() * (high - low + 1) + low)
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}
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class BOSkrypt {
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constructor() {
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}
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//
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encrypt(payload, key, keyIndex) {
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key = Buffer.from(key, 'hex')
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const iv = Buffer.from([ keyIndex, randomIntInc(0x00, 0xFF), randomIntInc(0x00, 0xFF) ])
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const UNIXNOW = Math.floor(new Date().valueOf()/1e3)
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const timestamp = (UNIXNOW - 1388534400).toString(16).padStart(2*4, '0')
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const ivPadBuffer = Buffer.from("00".repeat(8), 'hex')
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const _ivWithTimestamp = Buffer.from(timestamp + iv.toString('hex'), 'hex')
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const _iv56bitCRC = crc.crc8(_ivWithTimestamp)
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const ivWithTimestamp = Buffer.concat([
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_ivWithTimestamp,
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_iv56bitCRC
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])
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const ivWithTimestampPadded = Buffer.concat([ ivWithTimestamp, ivPadBuffer ])
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const uncPayloadHash = Buffer.from(crypto.createHash("sha1").update(payload).digest('hex').substring(0,10), 'hex') // first 40bits. 2*40/8
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let preparedPayload = "ENCR" + payload + '\x00'.repeat(
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payload.length < 20
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? randomIntInc(0,10)
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: 0) // random null-fill
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let compressedPreparedPayload = preparedPayload.split('').map(x => { //foreach char run this
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return x.charCodeAt(0) //get byte
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.toString(2) // to base2/bcd/"binary"
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.padStart(8, '0') // pad to 8 digits (dec4 = 100 => 00000100)
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.split('') // to array
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.reverse() // reverse
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.join('') // back to string
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.substring(0, 7) //take first 7 chars
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}).join('') //join to one complete string
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let compressedPayload = []
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for (let i=0;i<compressedPreparedPayload.length;i+=8) {
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let byte = parseInt(
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compressedPreparedPayload
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.substring(i, i+8) //select 8char chunk from bigstring
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.split('') // to array
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.reverse() // reverse
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.join(''), // back to string
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2) // parse from base2
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compressedPayload.push( byte ) //put in array
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}
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compressedPayload = Buffer.from(compressedPayload)
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const toEncryptData = Buffer.concat([
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uncPayloadHash, compressedPayload
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])
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let encryptedPayload = new aesjs.ModeOfOperation.ctr(key, new aesjs.Counter(ivWithTimestampPadded)).encrypt(toEncryptData)
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const encrpytedIncludingIVandSHA1Checksum = Buffer.concat([
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ivWithTimestamp, encryptedPayload
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])
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return encrpytedIncludingIVandSHA1Checksum.toString('base64')
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}
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}
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module.exports = new BOSkrypt() |