From dee65c8036f43094dc2573a9be0e08240fdc62f5 Mon Sep 17 00:00:00 2001
From: Philippe Teuwen <phil@teuwen.org>
Date: Sun, 9 Jan 2022 17:49:42 +0100
Subject: [PATCH] recover_pk: better warning if OpenSSL doesn't provide
 required curve (Fedora I'm looking at you)

cf https://bugzilla.redhat.com/show_bug.cgi?id=1019390#c25
---
 tools/recover_pk.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/tools/recover_pk.py b/tools/recover_pk.py
index 470f406ae..8f1f19140 100755
--- a/tools/recover_pk.py
+++ b/tools/recover_pk.py
@@ -34,7 +34,11 @@ def guess_curvename(signature):
 
 def recover(data, signature, curvename, alghash=None):
     recovered = set()
-    curve = sslcrypto.ecc.get_curve(curvename)
+    try:
+        curve = sslcrypto.ecc.get_curve(curvename)
+    except ValueError:
+        print("Warning, your OpenSSL doesn't provide support for curve", curvename)
+        return recovered
     recoverable = len(signature) % 1 == 1
     if (recoverable):
         try: