fst – Rev 1
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'use strict';
const crypto = require('crypto')
// Always 16 for AES.
const IV_LENGTH = 16
function encrypt(text, secret) {
secret = linearFeedback256(secret)
let iv = crypto.randomBytes(IV_LENGTH)
let cipher = crypto.createCipheriv('aes-256-cbc', new Buffer(secret), iv)
let encrypted = cipher.update(text)
encrypted = Buffer.concat([encrypted, cipher.final()]);
return iv.toString('hex') + ':' + encrypted.toString('hex')
}
function decrypt(text, secret) {
secret = linearFeedback256(secret)
let textParts = text.toString().split(':')
let iv = new Buffer(textParts.shift(), 'hex')
let encryptedText = new Buffer(textParts.join(':'), 'hex')
let decipher = crypto.createDecipheriv('aes-256-cbc', new Buffer(secret), iv)
let decrypted = decipher.update(encryptedText)
decrypted = Buffer.concat([decrypted, decipher.final()])
return decrypted.toString()
}
// First 256 bytes, 32 characters linear feedback shift.
function linearFeedback256(secret) {
do {
secret = secret.repeat(2)
} while(secret.length < 32)
return secret.substr(0, 32)
}
module.exports = { decrypt, encrypt }