From b2365dbd4b6744d2ad2aacd692f63f555ff11414 Mon Sep 17 00:00:00 2001
From: Fang <fang@fang.io>
Date: Tue, 4 Sep 2018 14:59:35 +0200
Subject: [PATCH] Remove nonstandard 27 minimum value from ecdsa signature v

Ethereum uses 27/28 (superseded) or 35/36 for the v value. Other use
cases may want the recovery value directly. This makes it produce 0/1.
---
 sys/zuse.hoon | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sys/zuse.hoon b/sys/zuse.hoon
index 6843f6501..70e9b9050 100644
--- a/sys/zuse.hoon
+++ b/sys/zuse.hoon
@@ -4188,7 +4188,7 @@
         =+  [r y]=(jc-mul g k)
         =/  s  (pro.n `@`(inv.n k) `@`(sum.n z (mul r prv)))
         =/  big-s  (gte (mul 2 s) ^n)
-        :*  v=(add 27 (mix (end 0 1 y) ?:(big-s 1 0)))
+        :*  v=(mix (end 0 1 y) ?:(big-s 1 0))
             r=r
             s=?.(big-s s (sub ^n s))
         ==