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
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
|
package fingerprint
import (
"crypto"
"encoding/base64"
"encoding/hex"
"fmt"
"strings"
"go.step.sm/crypto/internal/emoji"
)
// Encoding defines the supported encodings for certificates and key
// fingerprints.
//
// This type is the base for sshutil.FingerprintEncoding and
// x509util.FingerprintEncoding types.
type Encoding int
const (
// HexFingerprint represents the hex encoding of the fingerprint.
//
// This is the default encoding for an X.509 certificate.
HexFingerprint Encoding = iota + 1
// Base64Fingerprint represents the base64 encoding of the fingerprint.
//
// This is the default encoding for a public key.
Base64Fingerprint
// Base64URLFingerprint represents the base64URL encoding of the fingerprint.
Base64URLFingerprint
// Base64RawFingerprint represents the base64RawStd encoding of the
// fingerprint.
//
// This is the default encoding for an SSH key and certificate.
Base64RawFingerprint
// Base64RawURLFingerprint represents the base64RawURL encoding of the fingerprint.
Base64RawURLFingerprint
// EmojiFingerprint represents the emoji encoding of the fingerprint.
EmojiFingerprint
)
// New creates a fingerprint of the given data by hashing it and returns it in
// the encoding format.
func New(data []byte, h crypto.Hash, encoding Encoding) (string, error) {
if !h.Available() {
return "", fmt.Errorf("hash function %q is not available", h.String())
}
hash := h.New()
if _, err := hash.Write(data); err != nil {
return "", fmt.Errorf("error creating hash: %w", err)
}
fp := Fingerprint(hash.Sum(nil), encoding)
if fp == "" {
return "", fmt.Errorf("unknown encoding value %d", encoding)
}
return fp, nil
}
// Fingerprint encodes the given digest using the encoding format. If an invalid
// encoding is passed, the return value will be an empty string.
func Fingerprint(digest []byte, encoding Encoding) string {
switch encoding {
case HexFingerprint:
return strings.ToLower(hex.EncodeToString(digest))
case Base64Fingerprint:
return base64.StdEncoding.EncodeToString(digest)
case Base64URLFingerprint:
return base64.URLEncoding.EncodeToString(digest)
case Base64RawFingerprint:
return base64.RawStdEncoding.EncodeToString(digest)
case Base64RawURLFingerprint:
return base64.RawURLEncoding.EncodeToString(digest)
case EmojiFingerprint:
return emoji.Emoji(digest)
default:
return ""
}
}
|
