Restore ckd worker file.

diff --git a/src/lib/ckd.ts b/src/lib/ckd.ts
new file mode 100644 (file)
index 0000000..c0548e0
--- /dev/null
+++ b/src/lib/ckd.ts
@@ -0,0 +1,60 @@
+// SPDX-FileCopyrightText: 2024 Chris Duncan <chris@zoso.dev>
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+import blake2b from 'blake2b-wasm'
+import { nanoCKD } from './bip32-key-derivation.js'
+
+let addEventListener = globalThis.addEventListener
+let postMessage = globalThis.postMessage
+if (addEventListener == null || postMessage == null) {
+  const { isMainThread, parentPort } = await import('node:worker_threads')
+  if (!isMainThread && parentPort) {
+    addEventListener = Object.getPrototypeOf(parentPort).addListener.bind(parentPort)
+    postMessage = Object.getPrototypeOf(parentPort).postMessage.bind(parentPort)
+  }
+}
+
+/**
+* Derives BIP-44 Nano account private keys.
+*
+* @param {number} index - Index of the account
+* @returns {Promise<Account>}
+*/
+addEventListener('message', (message) => {
+  const { type, seed, index } = message.data ?? message
+  switch (type) {
+    case 'bip44': {
+      ckdBip44(seed, index).then(postMessage)
+      break
+    }
+    case 'blake2b': {
+      ckdBlake2b(seed, index).then(postMessage)
+      break
+    }
+  }
+})
+
+/**
+* Derives BIP-44 Nano account private keys.
+*
+* @param {number} index - Index of the account
+* @returns {Promise<Account>}
+*/
+async function ckdBip44 (seed: string, index: number): Promise<string> {
+  return nanoCKD(seed, index)
+}
+
+/**
+* Derives BLAKE2b account private keys.
+*
+* @param {number} index - Index of the account
+* @returns {Promise<Account>}
+*/
+async function ckdBlake2b (seed: string, index: number): Promise<string> {
+  const indexHex = index.toString(16).padStart(8, '0').toUpperCase()
+  const inputHex = `${seed}${indexHex}`.padStart(72, '0')
+  const inputArray = (inputHex.match(/.{1,2}/g) ?? []).map(h => parseInt(h, 16))
+  const inputBytes = Uint8Array.from(inputArray)
+  const hash = blake2b().update(inputBytes).digest('hex')
+  return hash
+}