From: Chris Duncan <chris@zoso.dev>
Date: Sun, 6 Sep 2026 09:17:29 +0000 (-0700)
Subject: Fix blake message byte counter in digest.
X-Git-Url: https://git.codecow.com/?a=commitdiff_plain;h=48b04f4d4beb3e2915ce408c738c28468b125cd5;p=nano25519.git

Fix blake message byte counter in digest.
---

diff --git a/src/assembly/blake2b.ts b/src/assembly/blake2b.ts
index ebece11..eb380cd 100644
--- a/src/assembly/blake2b.ts
+++ b/src/assembly/blake2b.ts
@@ -115,7 +115,7 @@ export class Blake2b {
 	digest (output: StaticArray<u8>): void {
 
 		// add final message block size to total bytes
-		this.t = v128.add<u64>(this.t, i64x2(this.c, 0))
+		this.t = v128.add<u64>(this.t, i64x2(this.c, u64(v128.extract_lane<u64>(this.t, 0) + u64(this.c) < u64(this.c))))
 
 		// pad final block with zeros
 		this.b.fill(0, this.c)