1// Copyright 2020 The SwiftShader Authors. All Rights Reserved.
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7//    http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14
15package util
16
17import (
18	"fmt"
19	"io"
20
21	"golang.org/x/crypto/openpgp"
22)
23
24// CheckPGP verifies that data has the PGP signature sig and was signed with the
25// PGP key key.
26func CheckPGP(data, sig, key io.Reader) error {
27	keyring, err := openpgp.ReadArmoredKeyRing(key)
28	if err != nil {
29		return fmt.Errorf("Failed to read pgp key: %v", err)
30	}
31
32	if _, err := openpgp.CheckDetachedSignature(keyring, data, sig); err != nil {
33		return fmt.Errorf("Failed to verify pgp: %v", err)
34	}
35
36	return nil
37}
38