From 14dd503f7612e18091e82b3b0a3ec381604d60df Mon Sep 17 00:00:00 2001
From: Rasmus Dahlberg <rasmus.dahlberg@kau.se>
Date: Tue, 3 Nov 2020 16:11:38 +0100
Subject: added client-side inclusion proof verification

---
 client/get-proof-by-hash/main.go | 58 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 58 insertions(+)
 create mode 100644 client/get-proof-by-hash/main.go

(limited to 'client/get-proof-by-hash')

diff --git a/client/get-proof-by-hash/main.go b/client/get-proof-by-hash/main.go
new file mode 100644
index 0000000..78a4621
--- /dev/null
+++ b/client/get-proof-by-hash/main.go
@@ -0,0 +1,58 @@
+package main
+
+import (
+	"context"
+	"flag"
+	"fmt"
+
+	"encoding/base64"
+	"net/http"
+
+	"github.com/golang/glog"
+	"github.com/system-transparency/stfe"
+	"github.com/system-transparency/stfe/client"
+)
+
+var (
+	operators      = flag.String("operators", "../../server/descriptor/stfe.json", "path to json-encoded list of log operators")
+	logId          = flag.String("log_id", "B9oCJk4XIOMXba8dBM5yUj+NLtqTE6xHwbvR9dYkHPM=", "base64-encoded log identifier")
+	chain          = flag.String("chain", "../../server/testdata/chain/ee.pem", "path to pem-encoded certificate chain that the log accepts")
+	signedTreeHead = flag.String("sth", "AAEgB9oCJk4XIOMXba8dBM5yUj+NLtqTE6xHwbvR9dYkHPMAAAF1jnn7fwAAAAAAAAAxICCqLJn4QWYd0aRIRjDWGf4GWalDIb/iH60jSSX89WgvAAAAQF9XPFRdM56KaelHFFg1RqjTw1yFL085zHhdNkLeZh9BCXxVTByqrHEMngAkY69EX45aJMWh9NymmPau0qoigA8=", "base64-encoded StItem of type StFormatSignedTreeHeadV1")
+	entry          = flag.String("entry", "AAUBOCAsYkIyzdIhdxKU37sxCsoACg32rItmtpbZDvBv3vtkow==", "base64-encoded StItem of type StFormatChecksumV1")
+)
+
+func main() {
+	flag.Parse()
+
+	cli, err := client.NewClientFromPath(*logId, *chain, "", *operators, &http.Client{}, true)
+	if err != nil {
+		glog.Fatal(err)
+	}
+
+	var sth stfe.StItem
+	if err := sth.UnmarshalB64(*signedTreeHead); err != nil {
+		glog.Fatalf("bad signed tree head: %v", err)
+	}
+	if err := client.VerifySignedTreeHeadV1(&sth, cli.Log.Scheme, cli.Log.Key()); err != nil {
+		glog.Fatalf("bad signed tree head: %v", err)
+	}
+	glog.V(3).Info("verified sth")
+
+	leaf, err := base64.StdEncoding.DecodeString(*entry)
+	if err != nil {
+		glog.Fatalf("failed decoding entry: %v", err)
+	}
+	proof, err := cli.GetProofByHash(context.Background(), sth.SignedTreeHeadV1.TreeHead.TreeSize, sth.SignedTreeHeadV1.TreeHead.RootHash.Data, leaf)
+	if err != nil {
+		glog.Fatalf("get-proof-by-hash failed: %v", err)
+	}
+	glog.V(3).Info("verified inclusion proof")
+
+	str, err := proof.MarshalB64()
+	if err != nil {
+		glog.Fatalf("failed encoding valid inclusion proof: %v", err)
+	}
+	fmt.Println(str)
+
+	glog.Flush()
+}
-- 
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