From: Chris Duncan <chris@codecow.com>
Date: Wed, 1 Jul 2026 07:29:35 +0000 (-0700)
Subject: Move documentation configure reusable index buffer for blake ckd function.
X-Git-Url: https://git.codecow.com/?a=commitdiff_plain;h=1e2f2113ccb00f5428d6a2ad9b7c2a2ca6044297;p=libnemo.git

Move documentation configure reusable index buffer for blake ckd function.
---

diff --git a/src/lib/vault/vault-worker.ts b/src/lib/vault/vault-worker.ts
index 6b12f86..1d111f7 100644
--- a/src/lib/vault/vault-worker.ts
+++ b/src/lib/vault/vault-worker.ts
@@ -386,6 +386,20 @@ async function _autolock (): Promise<void> {
 	NODE: parentPort?.postMessage({ data: { url: threadId.toString(), id, isLocked } })
 }
 
+const _index = new DataView(new ArrayBuffer(4))
+/**
+ * Derives account private keys from the wallet seed using either the BIP-44
+ * derivation algorithm or the BLAKE2b hashing algorithm.
+ *
+ * Separately, account public keys are derived from the private key using the
+ * Ed25519 key algorithm, and account addresses are derived from the public key
+ * as described in the Nano documentation.
+ *
+ * https://docs.nano.org/integration-guides/the-basics/
+ *
+ * @param {number} index - 4-byte index of account to derive
+ * @returns {Promise<ArrayBuffer>} Private key for the account
+*/
 function _ckd (index: number): Promise<ArrayBuffer> {
 	if (_seed == null) {
 		throw new Error('Wallet seed not found')
@@ -398,22 +412,9 @@ function _ckd (index: number): Promise<ArrayBuffer> {
 			return Bip44('Bitcoin seed', _seed, 0x100, index, 0, 0)
 		}
 		default: {
-			/**
-			 * Derives account private keys from a wallet seed using the BLAKE2b hashing
-			 * algorithm.
-			 *
-			 * Separately, account public keys are derived from the private key using the
-			 * Ed25519 key algorithm, and account addresses are derived from the public key
-			 * as described in the Nano documentation.
-			 * https://docs.nano.org/integration-guides/the-basics/
-			 *
-			 * @param {ArrayBuffer} seed - 32-byte secret seed of the wallet
-			 * @param {number} index - 4-byte index of account to derive
-			 * @returns {Promise<ArrayBuffer>} Private key for the account
-			*/
-			const i = new ArrayBuffer(4)
-			new DataView(i).setUint32(0, index, false)
-			const sk = new Blake2b(32).update(_seed).update(i).digest()
+			_index.setUint32(0, index, false)
+			const sk = new Blake2b(32).update(_seed).update(_index.buffer).digest()
+			_index.setUint32(0, 0)
 			return Promise.resolve(sk.buffer)
 		}
 	}