-
Notifications
You must be signed in to change notification settings - Fork 26
/
check.go
60 lines (51 loc) · 1.42 KB
/
check.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
/*
*
* Copyright 2024 tofuutils authors.
*
* 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 sha256check
import (
"bytes"
"crypto/sha256"
"encoding/hex"
"errors"
"strings"
)
var (
ErrCheck = errors.New("invalid sha256 checksum")
ErrNoSum = errors.New("file sha256 checksum not found for current platform")
)
func Check(data []byte, dataSums []byte, fileName string) error {
dataSum, err := extract(dataSums, fileName)
if err != nil {
return err
}
hashed := sha256.Sum256(data)
if !bytes.Equal(dataSum, hashed[:]) {
return ErrCheck
}
return nil
}
func extract(dataSums []byte, fileName string) ([]byte, error) {
dataSumsStr := string(dataSums)
for _, dataSumStr := range strings.Split(dataSumsStr, "\n") {
dataSumStr, ok := strings.CutSuffix(dataSumStr, fileName) //nolint
if ok {
dataSumStr = strings.TrimSpace(dataSumStr)
return hex.DecodeString(dataSumStr)
}
}
return nil, ErrNoSum
}