Add initial implementation

.babelrc

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+{
+  "presets": [
+    "es2015"
+  ],
+  "plugins": []
+}

.gitignore

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+#
+# Node
+#
+
 # Logs
 logs
 *.log

.npmrc

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+save=true

index.js

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+var CryptoJS = require('crypto-js');
+var reduxPersist = require('redux-persist');
+var stringify = require('json-stringify-safe');
+var createTransform = reduxPersist.createTransform;
+
+function createEncryptor(secretKey) {
+  return function (state, key) {
+    if (typeof state !== 'string') {
+      state = stringify(state);
+    }
+
+    return CryptoJS.AES.encrypt(state, secretKey).toString();
+  }
+}
+
+function createDecryptor(secretKey) {
+  return function (state, key) {
+    if (typeof state !== 'string') {
+      if (process.env.NODE_ENV !== 'production') {
+        console.error('redux-persist-transform-encrypt: expected outbound state to be a string');
+      }
+
+      return state;
+    }
+
+    try {
+      var bytes = CryptoJS.AES.decrypt(state, secretKey);
+      var newState = JSON.parse(bytes.toString(CryptoJS.enc.Utf8));
+
+      return newState;
+    } catch (err) {
+      if (process.env.NODE_ENV !== 'production') {
+        console.error(err);
+      }
+
+      return null;
+    }
+  }
+}
+
+module.exports = function (config) {
+  var inbound = createEncryptor(config.secretKey);
+  var outbound = createDecryptor(config.secretKey);
+
+  return createTransform(inbound, outbound, config);
+};

package.json

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+{
+  "name": "redux-persist-transform-encrypt",
+  "version": "1.0.0",
+  "description": "Encrypt your Redux store.",
+  "main": "index.js",
+  "scripts": {
+    "test": "mocha --compilers js:babel-register --recursive"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/maxdeviant/redux-persist-transform-encrypt.git"
+  },
+  "keywords": [
+    "redux",
+    "redux-persist",
+    "redux-persist-transform",
+    "encryption"
+  ],
+  "author": "Marshall Bowers <[email protected]>",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/maxdeviant/redux-persist-transform-encrypt/issues"
+  },
+  "homepage": "https://github.com/maxdeviant/redux-persist-transform-encrypt#readme",
+  "dependencies": {
+    "crypto-js": "^3.1.6",
+    "redux-persist": "^3.1.1"
+  },
+  "devDependencies": {
+    "babel-cli": "^6.8.0",
+    "babel-preset-es2015": "^6.6.0",
+    "babel-register": "^6.8.0",
+    "chai": "^3.5.0",
+    "mocha": "^2.4.5"
+  },
+  "peerDependencies": {
+    "redux-persist": "^3.0"
+  }
+}

test/spec.js

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+import { expect } from 'chai';
+const createTransform = require('../');
+
+describe('redux-persist-transform-encrypt', () => {
+  it('can encrypt incoming state', () => {
+    const encryptTransform = createTransform({
+      secretKey: 'redux-is-awesome'
+    });
+
+    const key = 'testState';
+    const state = {
+      foo: 'bar'
+    };
+
+    const newState = encryptTransform.in(state, key);
+
+    expect(newState).to.be.a('string');
+    expect(newState).to.not.eql(state);
+  });
+
+  it('can decrypt outgoing state', () => {
+    const encryptTransform = createTransform({
+      secretKey: 'redux-is-awesome'
+    });
+
+    const key = 'testState';
+    const state = {
+      foo: 'bar'
+    };
+
+    const encryptedState = encryptTransform.in(state, key);
+    const newState = encryptTransform.out(encryptedState, key);
+
+    expect(newState).to.eql(state);
+  });
+});