diff --git a/app/crypto.js b/app/crypto.js
new file mode 100644
index 0000000..101c224
--- /dev/null
+++ b/app/crypto.js
@@ -0,0 +1,19 @@
+export function string2Uint8Array(text) {
+    var buf = new ArrayBuffer(text.length * 2); // 2 bytes for each char
+    var bufView = new Uint8Array(buf);
+    for (var i = 0, strLen = text.length; i < strLen; i++) {
+        bufView[i] = text.charCodeAt(i);
+    }
+
+    return bufView;
+}
+
+export function getTemplate(templates, index) {
+    return templates[index % templates.length];
+}
+
+export function encode(template, indexes) {
+    var encodedArray = indexes.map(index => template[index % template.length]);
+    return encodedArray.join('');
+}
+
diff --git a/app/lesspass.js b/app/lesspass.js
new file mode 100644
index 0000000..6c717ba
--- /dev/null
+++ b/app/lesspass.js
@@ -0,0 +1,7 @@
+import crypto from 'crypto';
+
+export function make_password(key, text, length = 10) {
+    var password = crypto.createHmac('sha256', key).update(text).digest('hex');
+    return new Buffer(password).toString('base64').substring(0, length);
+}
+
diff --git a/app/password-generator.js b/app/password-generator.js
deleted file mode 100644
index 6cc6535..0000000
--- a/app/password-generator.js
+++ /dev/null
@@ -1,14 +0,0 @@
-(function () {
-    'use strict';
-
-    var crypto = require('crypto');
-
-    class PasswordGenerator {
-        static make_password(key, text, length = 10) {
-            var password = crypto.createHmac('sha1', key).update(text).digest('hex');
-            return new Buffer(password).toString('base64').substring(0, length);
-        }
-    }
-
-    module.exports = PasswordGenerator;
-}());
diff --git a/tests/crypto.tests.js b/tests/crypto.tests.js
new file mode 100644
index 0000000..76c1293
--- /dev/null
+++ b/tests/crypto.tests.js
@@ -0,0 +1,24 @@
+import assert from 'assert';
+import * as crypto from '../app/crypto';
+
+describe('crypto', function () {
+    it('should convert string into array of char code', function () {
+        var uint8Array = crypto.string2Uint8Array('ab');
+        assert.equal(97, uint8Array[0]);
+        assert.equal(98, uint8Array[1]);
+        assert.equal('a', String.fromCharCode(uint8Array[0]));
+    });
+
+    it('should get a template based on modulo of the index', function () {
+        var templates = ['template1', 'template2', 'template3'];
+        assert.equal('template2', crypto.getTemplate(templates, 4));
+        assert.equal('template2', crypto.getTemplate(templates, 10));
+    });
+
+    it('should return char inside template based on modulo of the indexes', function () {
+        var template = '0123456789';
+        assert.equal('01', crypto.encode(template, [20, 11]));
+        assert.equal('01', crypto.encode(template, [20, 21]));
+        assert.equal('29', crypto.encode(template, [12, 19]));
+    });
+});
\ No newline at end of file
diff --git a/tests/lesspass.tests.js b/tests/lesspass.tests.js
new file mode 100644
index 0000000..291de7e
--- /dev/null
+++ b/tests/lesspass.tests.js
@@ -0,0 +1,16 @@
+import assert from 'assert';
+import * as lesspass from '../app/lesspass';
+
+describe('lesspass', function () {
+    it('should return a default password with a size of 10', function () {
+        var generatedPassword = lesspass.make_password('password', 'facebook');
+        assert.equal(10, generatedPassword.length);
+    });
+    it('should allow to change password length', function () {
+        var generatedPassword = lesspass.make_password('password', 'facebook', 12);
+        assert.equal(12, generatedPassword.length);
+    });
+    it('should hmac with hash sha256', function () {
+        assert.equal('Y2ViYmVlZm', lesspass.make_password('password', 'facebook'));
+    });
+});
\ No newline at end of file
diff --git a/tests/password-generator.tests.js b/tests/password-generator.tests.js
deleted file mode 100644
index 908ed2f..0000000
--- a/tests/password-generator.tests.js
+++ /dev/null
@@ -1,20 +0,0 @@
-(function () {
-    'use strict';
-
-    var assert = require('assert');
-    var PasswordGenerator = require('../app/password-generator');
-
-    describe('password-generator', function () {
-        it('should return a default password with a size of 10', function () {
-            var generatedPassword = PasswordGenerator.make_password('password', 'facebook');
-            assert.equal(10, generatedPassword.length);
-        });
-        it('should allow to change password length', function () {
-            var generatedPassword = PasswordGenerator.make_password('password', 'facebook', 12);
-            assert.equal(12, generatedPassword.length);
-        });
-        it('should hmac text with master password', function () {
-            assert.equal('MjE5Y2I1OG', PasswordGenerator.make_password('password', 'facebook'));
-        });
-    });
-}());