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