From bdfbd4f162d66c3a6bd7c312a99e0b692e830792 Mon Sep 17 00:00:00 2001
From: Chocobozzz <florian.bigard@gmail.com>
Date: Wed, 4 Jan 2017 22:23:07 +0100
Subject: Server: use crypto instead of ursa for pod signature

---
 server/helpers/peertube-crypto.js | 54 +++++++++++++++++++++++++++++++--------
 1 file changed, 43 insertions(+), 11 deletions(-)

(limited to 'server/helpers/peertube-crypto.js')

diff --git a/server/helpers/peertube-crypto.js b/server/helpers/peertube-crypto.js
index 610cb16cd..0f1e02ad6 100644
--- a/server/helpers/peertube-crypto.js
+++ b/server/helpers/peertube-crypto.js
@@ -1,9 +1,9 @@
 'use strict'
 
+const crypto = require('crypto')
 const bcrypt = require('bcrypt')
 const fs = require('fs')
 const openssl = require('openssl-wrapper')
-const ursa = require('ursa')
 
 const constants = require('../initializers/constants')
 const logger = require('./logger')
@@ -16,12 +16,51 @@ const peertubeCrypto = {
   sign
 }
 
-function checkSignature (publicKey, rawData, hexSignature) {
-  const crt = ursa.createPublicKey(publicKey)
-  const isValid = crt.hashAndVerify('sha256', new Buffer(rawData).toString('hex'), hexSignature, 'hex')
+function checkSignature (publicKey, data, hexSignature) {
+  const verify = crypto.createVerify(constants.SIGNATURE_ALGORITHM)
+
+  let dataString
+  if (typeof data === 'string') {
+    dataString = data
+  } else {
+    try {
+      dataString = JSON.stringify(data)
+    } catch (err) {
+      logger.error('Cannot check signature.', { error: err })
+      return false
+    }
+  }
+
+  verify.update(dataString, 'utf8')
+
+  const isValid = verify.verify(publicKey, hexSignature, constants.SIGNATURE_ENCODING)
   return isValid
 }
 
+function sign (data) {
+  const sign = crypto.createSign(constants.SIGNATURE_ALGORITHM)
+
+  let dataString
+  if (typeof data === 'string') {
+    dataString = data
+  } else {
+    try {
+      dataString = JSON.stringify(data)
+    } catch (err) {
+      logger.error('Cannot sign data.', { error: err })
+      return ''
+    }
+  }
+
+  sign.update(dataString, 'utf8')
+
+  // TODO: make async
+  const myKey = fs.readFileSync(constants.CONFIG.STORAGE.CERT_DIR + 'peertube.key.pem')
+  const signature = sign.sign(myKey, constants.SIGNATURE_ENCODING)
+
+  return signature
+}
+
 function comparePassword (plainPassword, hashPassword, callback) {
   bcrypt.compare(plainPassword, hashPassword, function (err, isPasswordMatch) {
     if (err) return callback(err)
@@ -52,13 +91,6 @@ function cryptPassword (password, callback) {
   })
 }
 
-function sign (data) {
-  const myKey = ursa.createPrivateKey(fs.readFileSync(constants.CONFIG.STORAGE.CERT_DIR + 'peertube.key.pem'))
-  const signature = myKey.hashAndSign('sha256', data, 'utf8', 'hex')
-
-  return signature
-}
-
 // ---------------------------------------------------------------------------
 
 module.exports = peertubeCrypto
-- 
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