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main.go
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main.go
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// Copyright 2020 Google LLC
//
// 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.
// This utility unwraps the export.TEKSignatureList proto and
// extracts the signature so that an export file can be verified with openssl.
package main
import (
"flag"
"io/ioutil"
"log"
"github.com/google/exposure-notifications-server/internal/pb/export"
"google.golang.org/protobuf/proto"
)
var (
inFile = flag.String("in", "", "input file, containing sig proto")
outFile = flag.String("out", "", "output file, just signature")
)
func main() {
flag.Parse()
if *inFile == "" {
log.Fatalf("no in file passed in, --in")
}
if *outFile == "" {
log.Fatalf("no out file passed in, --out")
}
inData, err := ioutil.ReadFile(*inFile)
if err != nil {
log.Fatalf("unable to read input file: %v", err)
}
teksl := &export.TEKSignatureList{}
if err := proto.Unmarshal(inData, teksl); err != nil {
log.Fatalf("failed to unmarshal proto: %v", err)
}
log.Printf("Data: \n%v", teksl)
sig := teksl.Signatures[0].Signature
err = ioutil.WriteFile(*outFile, sig, 0600)
if err != nil {
log.Fatalf("unable to write output file: %v", err)
}
log.Printf("success, saved output to %v", *outFile)
}