print ssh public key fingerprints
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package main
import (
"bufio"
"crypto/sha256"
"encoding/base64"
"fmt"
"os"
"strings"
"golang.org/x/crypto/ssh"
)
func main() {
s := bufio.NewScanner(os.Stdin)
for s.Scan() {
pk, comment, _, _, err := ssh.ParseAuthorizedKey(s.Bytes())
if err != nil {
fmt.Fprintf(os.Stderr, "problem parsing pubkey from line %q: %v\n", s.Text(), err)
continue
}
hsh := sha256.New()
hsh.Write(pk.Marshal())
chk := hsh.Sum(nil)
var name string
u := strings.Fields(comment)
if len(u) > 0 {
name = strings.Join(u[0:], " ")
}
fmt.Printf("%20s : %s (%s)\n", name, base64.StdEncoding.WithPadding(base64.NoPadding).EncodeToString(chk), pk.Type())
}
if err := s.Err(); err != nil {
fmt.Fprintf(os.Stderr, "problem during scanning stdin: %v\n", err)
os.Exit(1)
}
}