Adding the cryptography stuff

This is probably the wrong way to use the cryptography.

lib/core/cryptoUtil.js

@@ -1,26 +1,28 @@
 const crypto = require('crypto');
-const algorithm = 'aes-256-ctr';
+const algorithm = 'aes-256-ecb';
 const bip32 = require('bip32');
 
+// NOTE I'm not a cryptographer... so don't be reusing any code from below as I don't have no idea what I'm doing
+
+const iv = null; // If I knew what I was doing I would have a value assigned here...
+
 module.exports.encrypt = (plainText, password) => {
-    // TODO encrypt text
+    const key = crypto.createHash('sha256').update(password, 'utf8').digest();
-    // const cipher = crypto.createCipheriv(algorithm, password);
+    const cipher = crypto.createCipheriv(algorithm, key, iv);
 
-    // var cipherText = cipher.update(plainText, 'utf8', 'hex');
+    var cipherText = cipher.update(plainText, 'utf8', 'hex');
-    // cipher += cipher.final('hex');
+    cipherText += cipher.final('hex');
-
+    return cipherText;
-    // console.log("CipherText: ", cipherText);
-    return plainText;
 }
 
 module.exports.decrypt = (cipherText, password) => {
-    // TODO decrypt cipherText
+    const key = crypto.createHash('sha256').update(password, 'utf8').digest();
-    // const decipher = crypto.createDecipheriv(algorithm, password)
+    const decipher = crypto.createDecipheriv(algorithm, key, iv);
         
-    // var plainText = decipher.update(cipherText, 'hex', 'utf8');
+    var plainText = decipher.update(cipherText, 'hex', 'utf8');
-    // plainText += decipher.final('utf8');
+    plainText += decipher.final('utf8');
 
-    return cipherText;
+    return plainText;
 }
 
 module.exports.randomDerivationPath = function(hardenedDerivation) {