From fb42f5e1d2b5ce07885dd6ec161b92f08ebfd61a Mon Sep 17 00:00:00 2001
From: ryu <114303361+ryuapp@users.noreply.github.com>
Date: Thu, 15 Jan 2026 21:10:31 +0900
Subject: [PATCH] fix: use Uint8Array.prototype.toHex() intead of custom
 function

---
 examples/scripts/hmac_generate_verify.ts | 10 +---------
 runtime/reference/std/crypto.md          |  5 +----
 2 files changed, 2 insertions(+), 13 deletions(-)

diff --git a/examples/scripts/hmac_generate_verify.ts b/examples/scripts/hmac_generate_verify.ts
index 06c1f9543..14c7218c0 100644
--- a/examples/scripts/hmac_generate_verify.ts
+++ b/examples/scripts/hmac_generate_verify.ts
@@ -37,16 +37,8 @@ const messageData = encoder.encode(message);
 // Generate the HMAC signature for the message
 const signature = await crypto.subtle.sign("HMAC", key, messageData);
 
-// Function to convert ArrayBuffer to hex string for readability only. This isn't part of the generation or verification
-function bufferToHex(buffer: ArrayBuffer): string {
-  const byteArray = new Uint8Array(buffer);
-  return Array.from(byteArray)
-    .map((byte) => byte.toString(16).padStart(2, "0"))
-    .join("");
-}
-
 // Output the generated HMAC signature in hexadecimal format
-console.log("Generated HMAC:", bufferToHex(signature));
+console.log("Generated HMAC:", new Uint8Array(signature).toHex());
 
 // Verify the HMAC signature
 const isValid = await crypto.subtle.verify("HMAC", key, signature, messageData);
diff --git a/runtime/reference/std/crypto.md b/runtime/reference/std/crypto.md
index f98f2c9be..b8af4781e 100644
--- a/runtime/reference/std/crypto.md
+++ b/runtime/reference/std/crypto.md
@@ -78,12 +78,9 @@ console.log(new Uint8Array(hash));
 ```ts
 import { crypto } from "@std/crypto/crypto";
 
-const toHex = (bytes: Uint8Array) =>
-  Array.from(bytes).map((b) => b.toString(16).padStart(2, "0")).join("");
-
 const data = new TextEncoder().encode("hello");
 const buf = await crypto.subtle.digest("BLAKE3", data);
-console.log(toHex(new Uint8Array(buf))); // e.g. "ea..."
+console.log(new Uint8Array(buf).toHex()); // e.g. "ea..."
 ```
 
 ### Hash a file (BLAKE3)