From: Chris Duncan <chris@zoso.dev>
Date: Sun, 6 Sep 2026 08:49:47 +0000 (-0700)
Subject: Fix blake message byte counter carry.
X-Git-Url: https://git.codecow.com/?a=commitdiff_plain;h=e8b9e057c843b6c56fac627d0f4e040e30527eb1;p=nano25519.git

Fix blake message byte counter carry.
---

diff --git a/src/assembly/blake2b.ts b/src/assembly/blake2b.ts
index e0712f0..ebece11 100644
--- a/src/assembly/blake2b.ts
+++ b/src/assembly/blake2b.ts
@@ -96,7 +96,7 @@ export class Blake2b {
 			if (this.c === this.b.length) {
 
 				// increment total byte counter
-				this.t = v128.add<u64>(this.t, i64x2(this.b.length, 0))
+				this.t = v128.add<u64>(this.t, i64x2(this.b.length, u64(v128.extract_lane<u64>(this.t, 0) + u64(this.b.length) < u64(this.b.length))))
 
 				// reset buffer counter to zero
 				this.c = 0