From dac0a5319ab1c52a0958647b1593f85339b77e29 Mon Sep 17 00:00:00 2001
From: Chocobozzz <florian.bigard@gmail.com>
Date: Fri, 5 Feb 2016 18:03:20 +0100
Subject: Split utils file

---
 helpers/peertubeCrypto.js | 152 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 152 insertions(+)
 create mode 100644 helpers/peertubeCrypto.js

(limited to 'helpers/peertubeCrypto.js')

diff --git a/helpers/peertubeCrypto.js b/helpers/peertubeCrypto.js
new file mode 100644
index 000000000..3e757659b
--- /dev/null
+++ b/helpers/peertubeCrypto.js
@@ -0,0 +1,152 @@
+;(function () {
+  'use strict'
+
+  var config = require('config')
+  var crypto = require('crypto')
+  var fs = require('fs')
+  var openssl = require('openssl-wrapper')
+  var ursa = require('ursa')
+
+  var logger = require('./logger')
+
+  var certDir = __dirname + '/../' + config.get('storage.certs')
+  var algorithm = 'aes-256-ctr'
+
+  var peertubeCrypto = {
+    checkSignature: checkSignature,
+    createCertsIfNotExist: createCertsIfNotExist,
+    decrypt: decrypt,
+    encrypt: encrypt,
+    getCertDir: getCertDir,
+    sign: sign
+  }
+
+  function checkSignature (public_key, raw_data, hex_signature) {
+    var crt = ursa.createPublicKey(public_key)
+    var 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)
+
+      var my_private_key = ursa.createPrivateKey(file)
+      var decrypted_key = my_private_key.decrypt(key, 'hex', 'utf8')
+      var decrypted_data = symetricDecrypt(data, decrypted_key)
+
+      return callback(null, decrypted_data)
+    })
+  }
+
+  function encrypt (public_key, data, callback) {
+    var crt = ursa.createPublicKey(public_key)
+
+    symetricEncrypt(data, function (err, dataEncrypted) {
+      if (err) return callback(err)
+
+      var key = crt.encrypt(dataEncrypted.password, 'utf8', 'hex')
+      var encrypted = {
+        data: dataEncrypted.crypted,
+        key: key
+      }
+
+      callback(null, encrypted)
+    })
+  }
+
+  function getCertDir () {
+    return certDir
+  }
+
+  function sign (data) {
+    var myKey = ursa.createPrivateKey(fs.readFileSync(certDir + 'peertube.key.pem'))
+    var 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) {
+        var 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.', { error: err })
+          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 .', { error: err })
+            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) {
+    var decipher = crypto.createDecipher(algorithm, password)
+    var 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)
+      }
+
+      var cipher = crypto.createCipher(algorithm, password)
+      var crypted = cipher.update(text, 'utf8', 'hex')
+      crypted += cipher.final('hex')
+      callback(null, { crypted: crypted, password: password })
+    })
+  }
+})()
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