feat: Add generator script

README.md

@@ -1,2 +1,37 @@
 # hns-address
 
+## Setup
+
+```bash
+git clone https://git.woodburn.au/nathanwoodburn/hns-address.git
+cd hns-address
+npm install hsd
+```
+
+## Find an address
+
+Edit `find-address.js` and fill in these fields:
+
+- `ACCOUNT_XPUB`: the account extended public key
+- `SEARCH_ADDRESS`: the address to search for
+
+
+```bash
+node find-address.js
+```
+
+## Generate addresses
+
+Edit `generate-address.js` and fill in these fields:
+
+- `ACCOUNT_XPUB`: the account extended public key
+- `START`: the starting index
+- `END`: the ending index
+
+```bash
+node generate-address.js
+```
+Probably best to save the output to a file.
+```bash
+node generate-address.js > addresses.txt
+```

generate-address.js

@@ -0,0 +1,39 @@
+/**
+ * This script finds an address given an account extended public key
+ * Usage: edit these fields below and run it like `node find-address.js`
+ */
+
+const assert = require('node:assert/strict');
+const HDPublicKey = require('hsd/lib/hd/public');
+const Address = require('hsd/lib/primitives/address');
+
+// **********
+// FILL THESE
+// **********
+const NETWORK = 'main';
+const ACCOUNT_XPUB = 'xpub6BvF6DnLZRV6my62FuQ8nw5TRebL8qr9Wa7u2tE1aEedHWBt4XAfSaNTmP1SM2nXErGWSzxRAHVwqstPzRrsXtA2vn1a4KzLwAVEgLNmfca'; // should start with: xpub, rpub, etc.
+
+const [START, END] = [0, 1000];
+
+(() => {
+  const account = HDPublicKey.fromBase58(ACCOUNT_XPUB, NETWORK);
+  console.log('[*] Using account public key:', account.xpubkey(NETWORK));
+  console.log('[*] Generating addresses', START, 'to', END);
+
+  const len = END - START;
+  assert((len >>> 0) > 0);
+
+  for (let i = START; i <= END; i++) {
+
+    /** @type {Buffer[]} */
+    const keys = [
+      account.derive(0).derive(i).publicKey, // receive
+      account.derive(1).derive(i).publicKey, // change
+    ];
+
+    for (const [branch, key] of keys.entries()) {
+      const addr = Address.fromPubkey(key);
+      console.log(addr.toString());
+    }
+  }
+})();