From: Chris Duncan <chris@zoso.dev>
Date: Thu, 4 Dec 2025 13:33:26 +0000 (-0800)
Subject: Simplify hex cast to bytes.
X-Git-Url: https://git.codecow.com/?a=commitdiff_plain;h=7099b8076fd043fa694881deb5a82a4b118b1b10;p=libnemo.git

Simplify hex cast to bytes.
---

diff --git a/src/lib/crypto/secp256k1.ts b/src/lib/crypto/secp256k1.ts
index 7dbff17..f6ea29d 100644
--- a/src/lib/crypto/secp256k1.ts
+++ b/src/lib/crypto/secp256k1.ts
@@ -155,20 +155,10 @@ export class Secp256k1 {
 	}
 
 	static hexToBytes (hex: string): Bytes {
-		const e = 'hex invalid'
-		if (typeof hex !== 'string') return this.err(e)
-		const hl = hex.length
-		const al = hl / 2
-		if (hl % 2) return this.err(e)
-		const array = new Uint8Array(al)
-		for (let ai = 0, hi = 0; ai < al; ai++, hi += 2) {
-			// treat each char as ASCII
-			const n1 = this._char(hex.charCodeAt(hi)) // parse first char, multiply it by 16
-			const n2 = this._char(hex.charCodeAt(hi + 1)) // parse second char
-			if (n1 === undefined || n2 === undefined) return this.err(e)
-			array[ai] = n1 * 16 + n2 // example: 'A9' => 10*16 + 9
-		}
-		return array
+		if (!/[0-9A-Fa-f]+/.test(hex ?? '')) return this.err('hex invalid')
+		if (hex.length % 2) hex = `0${hex}`
+		const intArray = hex.match(/.{2}/g)?.map(v => parseInt(v, 16))
+		return new Uint8Array(intArray ?? [])
 	}
 
 	// prettier-ignore