/
utils.go
81 lines (73 loc) · 2.88 KB
/
utils.go
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// Copyright 2020 Google LLC. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package client
import (
"context"
"fmt"
"time"
"github.com/golang/glog"
"github.com/google/trillian-examples/binary_transparency/firmware/api"
"github.com/transparency-dev/merkle/proof"
"github.com/transparency-dev/merkle/rfc6962"
)
// AwaitInclusion waits for the specified statement s to be included into the log and then
// returns the checkpoint under which it was found to be present, along with valid consistency and inclusion proofs.
func AwaitInclusion(ctx context.Context, c *ReadonlyClient, cp api.LogCheckpoint, s []byte) (api.LogCheckpoint, api.ConsistencyProof, api.InclusionProof, error) {
lh := rfc6962.DefaultHasher
for {
select {
case <-time.After(1 * time.Second):
//
case <-ctx.Done():
return api.LogCheckpoint{}, api.ConsistencyProof{}, api.InclusionProof{}, ctx.Err()
}
newCP, err := c.GetCheckpoint()
if err != nil {
return api.LogCheckpoint{}, api.ConsistencyProof{}, api.InclusionProof{}, err
}
if newCP.Size <= cp.Size {
glog.V(1).Info("Waiting for tree to integrate new leaves")
continue
}
var consistency api.ConsistencyProof
if cp.Size > 0 {
cproof, err := c.GetConsistencyProof(api.GetConsistencyRequest{From: cp.Size, To: newCP.Size})
if err != nil {
glog.Warningf("Received error while fetching consistency proof: %q", err)
continue
}
consistency = *cproof
if err := proof.VerifyConsistency(lh, cp.Size, newCP.Size, consistency.Proof, cp.Hash, newCP.Hash); err != nil {
// Whoa Nelly, this is bad - bail!
glog.Warning("Invalid consistency proof received!")
return *newCP, consistency, api.InclusionProof{}, fmt.Errorf("invalid inclusion proof received: %w", err)
}
glog.Infof("Consistency proof between %d and %d verified", cp.Size, newCP.Size)
}
cp = *newCP
ip, err := c.GetInclusion(s, cp)
if err != nil {
glog.Warningf("Received error while fetching inclusion proof: %q", err)
continue
}
if err := proof.VerifyInclusion(lh, ip.LeafIndex, cp.Size, lh.HashLeaf(s), ip.Proof, cp.Hash); err != nil {
// Whoa Nelly, this is bad - bail!
glog.Warning("Invalid inclusion proof received!")
return cp, consistency, ip, fmt.Errorf("invalid inclusion proof received: %w", err)
}
glog.Infof("Inclusion proof for leafhash 0x%x verified", lh)
return cp, consistency, ip, nil
}
// unreachable
}