a script to create a bcrypt hash from the command line. closes #651

scripts/hash_password.js

+#!/usr/bin/env node
+
+const
+config = require('../lib/configuration'),
+bcrypt = require('bcrypt');
+
+function bcryptPassword(password, cb) {
+  var bcryptWorkFactor = config.get('bcrypt_work_factor');
+
+  bcrypt.gen_salt(bcryptWorkFactor, function (err, salt) {
+    if (err) {
+      var msg = "error generating salt with bcrypt: " + err;
+      logger.error(msg);
+      return cb(msg);
+    }
+    bcrypt.encrypt(password, salt, function(err, hash) {
+      if (err) {
+        var msg = "error generating password hash with bcrypt: " + err;
+        logger.error(msg);
+        return cb(msg);
+      }
+      return cb(undefined, hash);
+    });
+  });
+};
+
+if (process.argv.length !== 3) {
+  console.log('Usage:', process.argv[1], '<password>');
+  process.exit(1);
+}
+
+bcryptPassword(process.argv[2], function(err, hash) {
+  if (err) {
+    process.sterr.write("error: " + err.toString() + "\n");
+    process.exit(1);
+  }
+  console.log(hash);
+});
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