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pubkeyhash.go
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pubkeyhash.go
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package pubkeyhash
import (
"crypto"
"crypto/x509"
"encoding/pem"
"fmt"
"io"
"io/ioutil"
"os"
"reflect"
"github.com/urfave/cli/v2"
action "github.com/IPA-CyberLab/kmgm/action"
"github.com/IPA-CyberLab/kmgm/pemparser"
"github.com/IPA-CyberLab/kmgm/wcrypto"
)
var Command = &cli.Command{
Name: "pubkeyhash",
Usage: "Dump pubkeyhash of the specified public key/certificate",
Aliases: []string{"hash"},
Flags: []cli.Flag{
&cli.PathFlag{
Name: "file",
Aliases: []string{"f"},
Usage: "PEM file containing public key/certificates",
Value: "-",
},
},
Action: func(c *cli.Context) error {
env := action.GlobalEnvironment
slog := env.Logger.Sugar()
var r io.Reader
path := c.String("file")
if path == "-" {
r = os.Stdin
} else {
f, err := os.Open(path)
if err != nil {
return err
}
defer f.Close()
r = f
}
bs, err := ioutil.ReadAll(r)
if err != nil {
return err
}
err = pemparser.ForeachPemBlock(bs, func(b *pem.Block) error {
var pub crypto.PublicKey
// FIXME[P4]: support private key as well -> extract pubkey
switch b.Type {
case pemparser.CertificatePemType:
cert, err := x509.ParseCertificate(b.Bytes)
if err != nil {
// FIXME[P4]: dump prefix?
slog.Errorf("Failed to parse a %s block: %v", b.Type, err)
return nil // ignore err to continue parsing other pem blocks
}
pub = cert.PublicKey
case pemparser.PublicKeyPemType:
pubi, err := x509.ParsePKIXPublicKey(b.Bytes)
if err != nil {
// FIXME[P4]: dump prefix?
slog.Errorf("Failed to parse a %s block: %v", b.Type, err)
return nil // ignore err to continue parsing other pem blocks
}
var ok bool
pub, ok = pubi.(crypto.PublicKey)
if !ok {
slog.Errorf("Unknown public key type: %v", reflect.TypeOf(pubi))
return nil // ignore err to continue parsing other pem blocks
}
}
if pub == nil {
return nil
}
hash, err := wcrypto.PubKeyPinString(pub)
if err != nil {
slog.Errorf("Failed to generate pubkeyhash: %v", err)
return nil // ignore err to continue parsing other pem blocks
}
// FIXME[P2]: dump subject if cmdlineflag
fmt.Printf("%s\n", hash)
return nil
})
if err != nil {
return err
}
return nil
},
}