From: Chris Duncan <chris@codecow.com>
Date: Sat, 8 Aug 2026 17:18:34 +0000 (-0700)
Subject: Extend hex validation to check length.
X-Git-Url: https://git.codecow.com/?a=commitdiff_plain;h=f38d26a5414cffadce4fe4d2776eb0859e51ec58;p=libnemo.git

Extend hex validation to check length.
---

diff --git a/src/lib/convert/hex.ts b/src/lib/convert/hex.ts
index e4237c9..cdd03a3 100644
--- a/src/lib/convert/hex.ts
+++ b/src/lib/convert/hex.ts
@@ -6,10 +6,18 @@ export const hex = Object.freeze({
 	 * Check if input is a valid hexadecimal string.
 	 *
 	 * @param {unknown} input - Variable to check
+	 * @param {number} [length] - Exact even-parity length of the input
 	 * @returns True if input is hex, else false
 	 */
-	is (input: unknown): input is Hex {
-		return typeof input === 'string' && /^([0-9A-F]{2})+$/i.test(input)
+	is (input: unknown, length?: number): input is Hex {
+		if (typeof length !== 'undefined') {
+			if (!Number.isSafeInteger(length) || length < 0 || length & 1) {
+				throw new TypeError(`Invalid "length" argument`)
+			}
+		}
+		const quantifier = length ? `{${length >> 1}}` : '+'
+		const pattern = new RegExp(`^([0-9A-F]{2})${quantifier}$`, 'i')
+		return typeof input === 'string' && pattern.test(input)
 	},
 
 	/**