From d7a950f388abf68e3e9ab91d098c7c594194c3f0 Mon Sep 17 00:00:00 2001
From: phelixnmc <githubnmc@blockchained.com>
Date: Sun, 11 Jan 2015 15:17:47 +0100
Subject: [PATCH] fail immediately on an empty signature adapted from
 https://github.com/bitcoin/bitcoin/commit/8dccba6a45db0466370726ed462b9da2eae43bce

---
 src/key.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/key.h b/src/key.h
index 37fa7260c..43aee187f 100644
--- a/src/key.h
+++ b/src/key.h
@@ -163,6 +163,9 @@ class CKey
 
     bool Verify(uint256 hash, const std::vector<unsigned char>& vchSig)
     {
+        if (vchSig.empty())
+            return false;
+
         // adapted from https://github.com/bitcoin/bitcoin/commit/488ed32f2ada1d1dd108fc245d025c4d5f252783
         // New versions of OpenSSL will reject non-canonical DER signatures. de/re-serialize first.
         unsigned char *norm_der = NULL;