add hkdf script

bin/hkdf

@@ -0,0 +1,18 @@
+#!/usr/bin/env node
+
+'use strict'
+
+const HKDF = require('node-hkdf-sync')
+
+const label = process.argv[2]
+const masterSeedHex = process.argv[3].trim()
+
+if (process.argv.length !== 4) {
+  console.log('hdkf <label> <masterKey>')
+  console.log('masterKey should be in hex encoding.')
+  process.exit(3)
+}
+
+const masterSeed = new Buffer(masterSeedHex, 'hex')
+const hkdf = new HKDF('sha256', 'lamassu-server-salt', masterSeed)
+console.log(hkdf.derive(label, 32).toString('hex'))

lib/plugins.js

@@ -60,7 +60,7 @@ let alertFingerprint = null
 let lastAlertTime = null
 
 exports.init = function init (connectionString) {
-  const masterSeed = fs.readFileSync('seeds/seed.txt', 'utf8').trim()
+  const masterSeed = new Buffer(fs.readFileSync('seeds/seed.txt', 'utf8').trim(), 'hex')
   hkdf = new HKDF('sha256', 'lamassu-server-salt', masterSeed)
 
   db.init(connectionString)

package.json

@@ -49,7 +49,8 @@
   "bin": {
     "lamassu-server": "./bin/lamassu-server",
     "ssu-raqia": "./bin/ssu-raqia",
-    "ssu": "./bin/ssu"
+    "ssu": "./bin/ssu",
+    "hkdf": "./bin/hkdf"
   },
   "scripts": {
     "test": "mocha --recursive test"