From e06e3bd7a998662fc2b12fd258ae5880537665b5 Mon Sep 17 00:00:00 2001
From: Jeffrey Walton <noloader@gmail.com>
Date: Mon, 26 Aug 2019 18:33:26 -0400
Subject: [PATCH] Fix ECP::Double and brainpoolP256r1 (GH #878)

---
 ecp.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/ecp.cpp b/ecp.cpp
index daabb819..1a3a244f 100644
--- a/ecp.cpp
+++ b/ecp.cpp
@@ -229,6 +229,8 @@ ECP::Point AdditionFunction::operator()(const ECP::Point& P) const
 
 		return R;
 	}
+#if 0
+	// Code path disabled at the moment due to https://github.com/weidai11/cryptopp/issues/878
 	else if (m_alpha == A_Star)
 	{
 		// Gyrations attempt to maintain constant-timeness
@@ -269,6 +271,7 @@ ECP::Point AdditionFunction::operator()(const ECP::Point& P) const
 
 		return R;
 	}
+#endif
 	else  // A_Montgomery
 	{
 		// More gyrations
@@ -404,6 +407,8 @@ ECP::Point AdditionFunction::operator()(const ECP::Point& P, const ECP::Point& Q
 
 		return R;
 	}
+#if 0
+	// Code path disabled at the moment due to https://github.com/weidai11/cryptopp/issues/878
 	else if (m_alpha == A_Star)
 	{
 		// Gyrations attempt to maintain constant-timeness
@@ -470,6 +475,7 @@ ECP::Point AdditionFunction::operator()(const ECP::Point& P, const ECP::Point& Q
 
 		return R;
 	}
+#endif
 	else  // A_Montgomery
 	{
 		// More gyrations