merge of features from hosted branch (#7)

major merge of features from the hosted branch that was created temporarily during the initial launch of jambonz.org

lib/utils/password-utils.js

@@ -0,0 +1,24 @@
+const crypto = require('crypto');
+const { argon2i } = require('argon2-ffi');
+const util = require('util');
+
+const getRandomBytes = util.promisify(crypto.randomBytes);
+
+const generateHashedPassword = async(password) => {
+  const salt = await getRandomBytes(32);
+  const passwordHash =  await argon2i.hash(password, salt);
+  return passwordHash;
+};
+
+const verifyPassword = async(passwordHash, password) => {
+  const isCorrect = await argon2i.verify(passwordHash, password);
+  return isCorrect;
+};
+
+const hashString = (s) => crypto.createHash('md5').update(s).digest('hex');
+
+module.exports = {
+  generateHashedPassword,
+  verifyPassword,
+  hashString
+};