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
79
80
81
82
|
# certstore [](https://pkg.go.dev/github.com/github/smimesign/certstore?tab=doc)
Certstore is a Go library for accessing user identities stored in platform certificate stores. On Windows and macOS, certstore can enumerate user identities and sign messages with their private keys.
## Example
```go
package main
import (
"crypto"
"encoding/hex"
"errors"
"fmt"
"crypto/rand"
"crypto/sha256"
"github.com/github/smimesign/certstore"
)
func main() {
sig, err := signWithMyIdentity("Ben Toews", "hello, world!")
if err != nil {
panic(err)
}
fmt.Println(hex.EncodeToString(sig))
}
func signWithMyIdentity(cn, msg string) ([]byte, error) {
// Open the certificate store for use. This must be Close()'ed once you're
// finished with the store and any identities it contains.
store, err := certstore.Open()
if err != nil {
return nil, err
}
defer store.Close()
// Get an Identity slice, containing every identity in the store. Each of
// these must be Close()'ed when you're done with them.
idents, err := store.Identities()
if err != nil {
return nil, err
}
// Iterate through the identities, looking for the one we want.
var me certstore.Identity
for _, ident := range idents {
defer ident.Close()
crt, errr := ident.Certificate()
if errr != nil {
return nil, errr
}
if crt.Subject.CommonName == "Ben Toews" {
me = ident
}
}
if me == nil {
return nil, errors.New("Couldn't find my identity")
}
// Get a crypto.Signer for the identity.
signer, err := me.Signer()
if err != nil {
return nil, err
}
// Digest and sign our message.
digest := sha256.Sum256([]byte(msg))
signature, err := signer.Sign(rand.Reader, digest[:], crypto.SHA256)
if err != nil {
return nil, err
}
return signature, nil
}
```
|
