From 8ad25ffba31a33d3607e5a6bd0d6c09a60772fe2 Mon Sep 17 00:00:00 2001
From: Chris Duncan <chris@codecow.com>
Date: Thu, 27 Aug 2026 18:44:27 -0700
Subject: [PATCH] Fix byte comparison.

---
 src/assembly/crypto_verify.ts | 4 ++--
 src/assembly/utils.ts         | 7 ++++---
 2 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/src/assembly/crypto_verify.ts b/src/assembly/crypto_verify.ts
index d19caf8..7bbfe9f 100644
--- a/src/assembly/crypto_verify.ts
+++ b/src/assembly/crypto_verify.ts
@@ -64,7 +64,7 @@ export function crypto_verify_relaxed (s: StaticArray<u8>, M: StaticArray<u8>, p
 	ge_double_scalarmult_vartime_to_p3(sb_ah, h, A, S)
 	ge_p3_tobytes(check_r, sb_ah)
 
-	return equalbytes(s, check_r) - 1
+	return equalbytes(s, check_r, KEY_BYTELENGTH) - 1
 }
 
 /**
@@ -105,5 +105,5 @@ export function crypto_verify_strict (s: StaticArray<u8>, M: StaticArray<u8>, ml
 	return ge_has_small_order(check) - 1
 
 	// if (ge_has_small_order(check) == 0) return -1
-	// return equalbytes(s, check) - 1
+	// return equalbytes(s, check, KEY_BYTELENGTH) - 1
 }
diff --git a/src/assembly/utils.ts b/src/assembly/utils.ts
index f17565b..3453677 100644
--- a/src/assembly/utils.ts
+++ b/src/assembly/utils.ts
@@ -28,13 +28,14 @@ export function equal (b: i8, c: i8): u8 {
  * Constant-time byte comparison.
  * @param {StaticArray<u8>} f
  * @param {StaticArray<u8>} g
- * @returns 1 if all bytes are equal, else 0
+ * @param {i32} n
+ * @returns 1 if `n` bytes are equal, else 0
  */
 //@ts-expect-error
 @inline
-export function equalbytes (f: StaticArray<u8>, g: StaticArray<u8>): u8 {
+export function equalbytes (f: StaticArray<u8>, g: StaticArray<u8>, n: i32): u8 {
 	let s: u8 = 0
-	for (let i = 0; i < 12; i++) {
+	for (let i = 0; i < n; i++) {
 		s |= f[i] ^ g[i]
 	}
 	return ((s - 1) >> 8) & 1
-- 
2.52.0