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'use strict'
const config = require('config')
const crypto = require('crypto')
const fs = require('fs')
const openssl = require('openssl-wrapper')
const path = require('path')
const ursa = require('ursa')
const logger = require('./logger')
const certDir = path.join(__dirname, '..', '..', config.get('storage.certs'))
const algorithm = 'aes-256-ctr'
const peertubeCrypto = {
checkSignature: checkSignature,
createCertsIfNotExist: createCertsIfNotExist,
decrypt: decrypt,
encrypt: encrypt,
getCertDir: getCertDir,
sign: sign
}
function checkSignature (public_key, raw_data, hex_signature) {
const crt = ursa.createPublicKey(public_key)
const is_valid = crt.hashAndVerify('sha256', new Buffer(raw_data).toString('hex'), hex_signature, 'hex')
return is_valid
}
function createCertsIfNotExist (callback) {
certsExist(function (exist) {
if (exist === true) {
return callback(null)
}
createCerts(function (err) {
return callback(err)
})
})
}
function decrypt (key, data, callback) {
fs.readFile(getCertDir() + 'peertube.key.pem', function (err, file) {
if (err) return callback(err)
const my_private_key = ursa.createPrivateKey(file)
const decrypted_key = my_private_key.decrypt(key, 'hex', 'utf8')
const decrypted_data = symetricDecrypt(data, decrypted_key)
return callback(null, decrypted_data)
})
}
function encrypt (public_key, data, callback) {
const crt = ursa.createPublicKey(public_key)
symetricEncrypt(data, function (err, dataEncrypted) {
if (err) return callback(err)
const key = crt.encrypt(dataEncrypted.password, 'utf8', 'hex')
const encrypted = {
data: dataEncrypted.crypted,
key: key
}
callback(null, encrypted)
})
}
function getCertDir () {
return certDir
}
function sign (data) {
const myKey = ursa.createPrivateKey(fs.readFileSync(certDir + 'peertube.key.pem'))
const signature = myKey.hashAndSign('sha256', data, 'utf8', 'hex')
return signature
}
// ---------------------------------------------------------------------------
module.exports = peertubeCrypto
// ---------------------------------------------------------------------------
function certsExist (callback) {
fs.exists(certDir + 'peertube.key.pem', function (exists) {
return callback(exists)
})
}
function createCerts (callback) {
certsExist(function (exist) {
if (exist === true) {
const string = 'Certs already exist.'
logger.warning(string)
return callback(new Error(string))
}
logger.info('Generating a RSA key...')
openssl.exec('genrsa', { 'out': certDir + 'peertube.key.pem', '2048': false }, function (err) {
if (err) {
logger.error('Cannot create private key on this pod.')
return callback(err)
}
logger.info('RSA key generated.')
logger.info('Manage public key...')
openssl.exec('rsa', { 'in': certDir + 'peertube.key.pem', 'pubout': true, 'out': certDir + 'peertube.pub' }, function (err) {
if (err) {
logger.error('Cannot create public key on this pod.')
return callback(err)
}
logger.info('Public key managed.')
return callback(null)
})
})
})
}
function generatePassword (callback) {
crypto.randomBytes(32, function (err, buf) {
if (err) return callback(err)
callback(null, buf.toString('utf8'))
})
}
function symetricDecrypt (text, password) {
const decipher = crypto.createDecipher(algorithm, password)
let dec = decipher.update(text, 'hex', 'utf8')
dec += decipher.final('utf8')
return dec
}
function symetricEncrypt (text, callback) {
generatePassword(function (err, password) {
if (err) return callback(err)
const cipher = crypto.createCipher(algorithm, password)
let crypted = cipher.update(text, 'utf8', 'hex')
crypted += cipher.final('hex')
callback(null, { crypted: crypted, password: password })
})
}
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