From 480150f87f136e25178803fab421922b47b8b83e Mon Sep 17 00:00:00 2001
From: Andreas Schildbach <andreas.schildbach@bloq.com>
Date: Mon, 4 Feb 2019 11:55:54 +0100
Subject: [PATCH] SegwitAddress: Allow only compressed keys in fromKey().

---
 core/src/main/java/org/bitcoinj/core/SegwitAddress.java | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/core/src/main/java/org/bitcoinj/core/SegwitAddress.java b/core/src/main/java/org/bitcoinj/core/SegwitAddress.java
index 22e2224a..4aa62628 100644
--- a/core/src/main/java/org/bitcoinj/core/SegwitAddress.java
+++ b/core/src/main/java/org/bitcoinj/core/SegwitAddress.java
@@ -16,6 +16,9 @@
 
 package org.bitcoinj.core;
 
+import static com.google.common.base.Preconditions.checkArgument;
+import static com.google.common.base.Preconditions.checkState;
+
 import java.io.ByteArrayOutputStream;
 
 import javax.annotation.Nullable;
@@ -24,8 +27,6 @@ import org.bitcoinj.params.Networks;
 import org.bitcoinj.script.Script;
 import org.bitcoinj.script.Script.ScriptType;
 
-import static com.google.common.base.Preconditions.checkState;
-
 /**
  * <p>Implementation of native segwit addresses. They are composed of two parts:</p>
  *
@@ -202,6 +203,7 @@ public class SegwitAddress extends Address {
      * @return constructed address
      */
     public static SegwitAddress fromKey(NetworkParameters params, ECKey key) {
+        checkArgument(key.isCompressed(), "only compressed keys allowed");
         return fromHash(params, key.getPubKeyHash());
     }