Merge pull request #6 from appliedblockchain/encryption

Encryption

Author: campbell-codes

package.json

@@ -1,7 +1,7 @@
 {
   "private": true,
   "name": "b-privacy",
-  "version": "0.2.1",
+  "version": "0.3.0",
   "main": "src/b-privacy.js",
   "dependencies": {
     "bitcore-lib": "^0.15.0",

src/asymmetric-encryption.js

@@ -21,18 +21,17 @@ function kdf(keyMaterial, keyLength) {
 
 // Encrypts `input` JSON message using `privateKey` and `remoteKey` public key.
 function encrypt(input, _privateKey, _remoteKey) {
-
   const data = Buffer.from(JSON.stringify(input), 'utf8');
 
   // We'll work on buffer for private key.
-  const privateKey = toBuffer(_privateKey);
+  const privateKey = _privateKey;
 
   // We'll work on buffer for remote public key.
-  const remoteKey = toBuffer(_remoteKey);
+  const remoteKey = _remoteKey;
 
   // Derive secret.
   const secret = ec.keyFromPrivate(privateKey)
-    .derive(ec.keyFromPublic(remoteKey).getPublic())
+    .derive(ec.keyFromPublic({x: remoteKey.slice(0,32), y: remoteKey.slice(32,remoteKey.length)}).getPublic())
     .toArrayLike(Buffer);
 
   const key = kdf(secret, 32);

src/b-privacy.js

@@ -35,16 +35,6 @@ class BPrivacy {
     }
   }
 
-  // Returns public key as `Buffer`.
-  get publicKey() {
-    return toBuffer(this.pubKey.toString());
-  }
-
-  // Returns private key as `Buffer`.
-  get privateKey() {
-    return toBuffer(this.pvtKey.toString());
-  }
-
   static generateMnemonicPhrase() {
     return new Mnemonic().phrase;
   }
@@ -71,25 +61,28 @@ class BPrivacy {
     const pathLevel = `44'/${coinType}'/${account}'/${change}` // *note2
     const derivedChild = this.hdKey.derive(`m/${pathLevel}/${index}`)
     const pvtKey = derivedChild.privateKey
-    this.pvtKey = pvtKey
-    this.pubKey = pvtKey.publicKey
+    this.pvtKeyBtc = pvtKey;
+    this.pvtKey = toBuffer(pvtKey.toString());
+    this.pubKey = this.deriveEthereumPublicKey();
     this.keyIdx = index
-    this.deriveEthereumAddress()
-    return pvtKey
+    this.address = this.deriveEthereumAddress()
+  }
+
+  deriveEthereumPublicKey() {
+    return util.privateToPublic(this.pvtKey);
   }
 
   deriveEthereumAddress() {
     const eBip44 = EthereumBip44.fromPrivateSeed(this.hdKey.toString())
     const address = eBip44.getAddress(this.keyIdx)
-    this.address = address
-    return
+    return address;
   }
 
   // returns a promise with one parameter, the message signature
   sign(message) {
     const msgHash = util.sha3(message)
 
-    const signature = util.ecsign(msgHash, new Buffer(this.pvtKey.toString(), 'hex'))
+    const signature = util.ecsign(msgHash, this.pvtKey)
     return signature
   }
 
@@ -120,12 +113,12 @@ class BPrivacy {
   // Encrypts `input` using `BPrivacy`'s private key and provided reader's
   // remote `publicKey`.
   encrypt(input, remoteKey) {
-    return BPrivacy.encrypt(input, this.privateKey, remoteKey);
+    return BPrivacy.encrypt(input, this.pvtKey, remoteKey);
   }
 
   // Decrypts `input` message using `BPrivacy`'s private key.
   decrypt(input) {
-    return BPrivacy.decrypt(input, this.privateKey);
+    return BPrivacy.decrypt(input, this.pvtKey);
   }
 
 }

src/core.js

@@ -105,7 +105,7 @@ module.exports = {
   isHex,
   isHex0x,
   toBuffer,
-  // toHex,
+  //toHex,
   toHex0x,
   areBuffersEqual,
   kindOf,

test/asymmetric-encryption.test.js

@@ -11,7 +11,7 @@ describe('AsymmetricEncryption', function () {
     const a = new B({ mnemonic: B.generateMnemonicPhrase() })
     const b = new B({ mnemonic: B.generateMnemonicPhrase() })
     const m = { foo: "bar" };
-    const a2b = a.encrypt(m, b.publicKey);
+    const a2b = a.encrypt(m, b.pubKey);
     const m2 = b.decrypt(a2b);
     t(m2, m);
   });

test/b-privacy.test.js

@@ -2,6 +2,7 @@ const c = console
 const BPrivacy = require('../src/b-privacy.js')
 const localStorageMock = {}
 let mnemonicTmp
+const { toHex0x, toBuffer } = require('../src/core');
 
 const examplePhrase = "aspect else project orient seed doll admit remind library turkey dutch inhale"
 
@@ -46,13 +47,13 @@ test('generates a 12 work mnemoic phrase', () => {
 test('derives the first private key, public key and address', () => {
   const mnemonicPhrase = BPrivacy.generateMnemonicPhrase();
   const bp = new BPrivacy({mnemonic: mnemonicPhrase})
-  bp.deriveKey()
   const key = bp.pvtKey
   expect(key).toBeDefined()
-  expect(key.toString()).toHaveLength(64)
+  // We use to 0x prefix for all
+  expect(toHex0x(key)).toHaveLength(66)
   const pubKey = bp.pubKey
   expect(pubKey).toBeDefined()
-  expect(pubKey.toString()).toHaveLength(66)
+  expect(toHex0x(pubKey)).toHaveLength(130)
   const address = bp.address
   expect(address).toBeDefined()
   expect(address.toString()).toHaveLength(42)
@@ -104,14 +105,8 @@ test('signs a message via web3Sign', () => {
   // optput: 0x3ac225168df54212a25c1c01fd35bebfea408fdac2e31ddd6f80a4bbf9a5f1cb 0x1c1931b8a3c91af0afae485d8ce5b597c5f2424f2bb3055b56e0204790047dd85379bce18b7279a04a1674d4bbfc302a5a68fb497da4a90bd924991bbeb7db1b1b 0xfc86f571353e44568aa9103db4edd7f53a410c73
 })
 
-test('converts a stringified public_key (without 0x prefix) to an address', () => {
-  const bp = new BPrivacy({mnemonic: examplePhrase})
-  let staticAddress = BPrivacy.publicKeyToAddress(bp.pubKey.toString());
-  expect(staticAddress).toEqual(bp.address);
-});
-
-test('converts a stringified public_key (with 0x prefix) to an address', () => {
+test('converts a public_key to an address', () => {
   const bp = new BPrivacy({mnemonic: examplePhrase})
-  let staticAddress = BPrivacy.publicKeyToAddress(`0x${bp.pubKey.toString()}`);
+  let staticAddress = BPrivacy.publicKeyToAddress(bp.pubKey);
   expect(staticAddress).toEqual(bp.address);
 });