From 7745cbb679dc9057e31ae625004fdc3c46aa327a Mon Sep 17 00:00:00 2001
From: Olaoluwa Osuntokun <laolu32@gmail.com>
Date: Fri, 15 Dec 2023 14:25:11 -0800
Subject: [PATCH] btcutl/gcs: update filter logic to use new DoubleHashRaw

---
 btcutil/gcs/builder/builder.go | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/btcutil/gcs/builder/builder.go b/btcutil/gcs/builder/builder.go
index af05f819a5..3a85ad0519 100644
--- a/btcutil/gcs/builder/builder.go
+++ b/btcutil/gcs/builder/builder.go
@@ -8,6 +8,7 @@ package builder
 import (
 	"crypto/rand"
 	"fmt"
+	"io"
 	"math"
 
 	"github.com/btcsuite/btcd/btcutil/gcs"
@@ -348,7 +349,10 @@ func GetFilterHash(filter *gcs.Filter) (chainhash.Hash, error) {
 		return chainhash.Hash{}, err
 	}
 
-	return chainhash.DoubleHashH(filterData), nil
+	return chainhash.DoubleHashRaw(func(w io.Writer) error {
+		_, err := w.Write(filterData)
+		return err
+	}), nil
 }
 
 // MakeHeaderForFilter makes a filter chain header for a filter, given the
@@ -367,5 +371,8 @@ func MakeHeaderForFilter(filter *gcs.Filter, prevHeader chainhash.Hash) (chainha
 
 	// The final filter hash is the double-sha256 of the hash computed
 	// above.
-	return chainhash.DoubleHashH(filterTip), nil
+	return chainhash.DoubleHashRaw(func(w io.Writer) error {
+		_, err := w.Write(filterTip)
+		return err
+	}), nil
 }