Merge pull request #30 from shoutcool/add-bip39-and-bip32-support

added bip39 and bip32 support

README.md

@@ -37,6 +37,43 @@ console.log(lamdenWallet)
    }
 ```
 
+### Create a new BIP39 / BIP 32 compatible wallet
+- **BIP39** = 24 seed phrase
+- **BIP32** = derivation path
+
+```javascript
+let lamdenWallet = Lamden.wallet.new_wallet_bip39()
+
+console.log(lamdenWallet)
+>> {
+       sk: 'a6b72cb3d1160c26f9f39a8f1d4a3c7c0da2ac59d193b66ac5f919ec77f28915',
+       vk: '53d016586ce35c5f6ea581cadf4693dd2850621dfad6a2261e8dd311c83e11d5',
+       derivationIndex: 0,
+       mnemonic: 'evidence rifle behave normal duty mean junk chicken salute relief raw chunk region ocean guard swarm taste toy loop ozone spell crumble apart echo'
+   }
+
+```
+
+### Restore a  BIP39 / BIP 32 compatible wallet
+- **BIP39** = 24 seed phrase
+- **BIP32** = derivation path
+
+```javascript
+const mnemonic = 'evidence rifle behave normal duty mean junk chicken salute relief raw chunk region ocean guard swarm taste toy loop ozone spell crumble apart echo'
+const derivationIndex = 0;
+let lamdenWallet = Lamden.wallet.new_wallet_bip39(mnemonic, derivationIndex)
+
+console.log(lamdenWallet)
+>> {
+       sk: 'a6b72cb3d1160c26f9f39a8f1d4a3c7c0da2ac59d193b66ac5f919ec77f28915',
+       vk: '53d016586ce35c5f6ea581cadf4693dd2850621dfad6a2261e8dd311c83e11d5',
+       derivationIndex: 0,
+       mnemonic: 'evidence rifle behave normal duty mean junk chicken salute relief raw chunk region ocean guard swarm taste toy loop ozone spell crumble apart echo'
+   }
+
+```
+
+
 ### Get a public key (vk) from a private key (sk)
 Takes the sk as an argument and returns the vk
 ```javascript
@@ -316,4 +353,4 @@ tx.sign(null, keystore.wallets[0])
 
 // Send transaction
 tx.send()
-```
+```

dist/lamden.js

@@ -2359,6 +2359,8 @@ var utils = /*#__PURE__*/Object.freeze({
 });
 
 const nacl = require('tweetnacl');
+const bip39 = require('bip39');
+const bip32 = require('ed25519-hd-key');
 
 /**
     * Create a wallet object for signing and verifying messages
@@ -2476,6 +2478,62 @@ function new_wallet(seed = null) {
     const keys = generate_keys(seed);
     return keys_to_format(keys);
 }
+
+/**
+ *
+ * @param mnemonic 24 word seed phrase
+ * @param derivationIndex bip32 derivation key index
+ * @returns {{derivationIndex: number, vk: string, sk: string, mnemonic: (string|undefined)}}
+ *      derivationIndex:    bip32 derivation key index
+ *      vk:                 Verify Key (VK) represented as a 64 character hex string
+ *      sk:                 Signing Key (SK) represented as a 64 character hex string
+ *      mnemonic:           24 word seed phrase
+
+ */
+function generate_keys_bip39(mnemonic = undefined, derivationIndex = 0) {
+    let finalMnemonic;
+
+    if (mnemonic !== undefined){
+        finalMnemonic = mnemonic;
+    }else {
+        finalMnemonic = bip39.generateMnemonic(256);
+    }
+
+    const seed = bip39.mnemonicToSeedSync(finalMnemonic).toString('hex');
+
+    const derivationPath = "m/44'/789'/" + derivationIndex + "'/0'/0'";
+    const { key, chainCode } = bip32.derivePath(derivationPath, seed, 0x80000000);
+
+    const privateKey = key.toString('hex');
+    const publicKey = bip32.getPublicKey(key, false).toString('hex');
+
+    if (publicKey !== get_vk(privateKey)){
+        throw Error('Bip32 public key does not match with Lamden public key!')
+    }
+
+    return {
+        sk: privateKey,
+        vk: publicKey,
+        derivationIndex: derivationIndex,
+        mnemonic: finalMnemonic
+    }
+}
+
+/**
+ * @param Uint8Array(length: 32) seed
+ *      seed:   A Uint8Array with a length of 32 to seed the keyPair with. This is advanced behavior and should be
+ *              avoided by everyday users
+ *
+ * @return {{derivationIndex: number, vk: string, sk: string, mnemonic: (string|undefined)}} { sk, vk, derivationIndex, mnemonic }
+ *      sk:                 Signing Key (SK) represented as a 64 character hex string
+ *      vk:                 Verify Key (VK) represented as a 64 character hex string
+ *      derivationIndex:    Bip32 derivation index
+ *      mnemonic:           24 word seed phrase (just returned if method was called without existing mnemonic)
+ */
+function new_wallet_bip39(mnemonic = undefined, derivationIndex = 0) {
+    return generate_keys_bip39(mnemonic, derivationIndex);
+}
+
 /**
  * @param String sk
  * @param Uint8Array msg
@@ -2525,6 +2583,7 @@ var wallet = /*#__PURE__*/Object.freeze({
             format_to_keys: format_to_keys,
             keys_to_format: keys_to_format,
             new_wallet: new_wallet,
+            new_wallet_bip39: new_wallet_bip39,
             sign: sign,
             verify: verify
 });