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
|
// Copyright 2011 Miek Gieben. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package dns
import (
"crypto/sha1"
"hash"
"io"
"strings"
)
type saltWireFmt struct {
Salt string `dns:"size-hex"`
}
// HashName hashes a string (label) according to RFC 5155. It returns the hashed string.
func HashName(label string, ha uint8, iter uint16, salt string) string {
saltwire := new(saltWireFmt)
saltwire.Salt = salt
wire := make([]byte, DefaultMsgSize)
n, err := PackStruct(saltwire, wire, 0)
if err != nil {
return ""
}
wire = wire[:n]
name := make([]byte, 255)
off, err := PackDomainName(strings.ToLower(label), name, 0, nil, false)
if err != nil {
return ""
}
name = name[:off]
var s hash.Hash
switch ha {
case SHA1:
s = sha1.New()
default:
return ""
}
// k = 0
name = append(name, wire...)
io.WriteString(s, string(name))
nsec3 := s.Sum(nil)
// k > 0
for k := uint16(0); k < iter; k++ {
s.Reset()
nsec3 = append(nsec3, wire...)
io.WriteString(s, string(nsec3))
nsec3 = s.Sum(nil)
}
return unpackBase32(nsec3)
}
|
