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newpgpkeycmd.go
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/
newpgpkeycmd.go
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//
// Copyright (c) SAS Institute Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
package token
import (
"crypto"
"crypto/rsa"
"encoding/hex"
"errors"
"fmt"
"os"
"strings"
"time"
"github.com/ProtonMail/go-crypto/openpgp"
"github.com/ProtonMail/go-crypto/openpgp/armor"
"github.com/ProtonMail/go-crypto/openpgp/packet"
"github.com/spf13/cobra"
"github.com/sassoftware/relic/v8/cmdline/shared"
"github.com/sassoftware/relic/v8/token"
)
var NewPgpKeyCmd = &cobra.Command{
Use: "pgp-generate",
Short: "Generate a new PGP key from token",
RunE: newPgpKeyCmd,
}
var (
argUserName string
argUserComment string
argUserEmail string
)
func init() {
shared.RootCmd.AddCommand(NewPgpKeyCmd)
NewPgpKeyCmd.Flags().StringVarP(&argUserName, "name", "n", "", "Name of user identity")
NewPgpKeyCmd.Flags().StringVarP(&argUserComment, "comment", "C", "", "Comment of user identity")
NewPgpKeyCmd.Flags().StringVarP(&argUserEmail, "email", "E", "", "Email of user identity")
addSelectOrGenerateFlags(NewPgpKeyCmd)
}
func makeKey(key token.Key, uids []*packet.UserId) (*openpgp.Entity, error) {
creationTime := time.Now()
var pubKey *packet.PublicKey
switch pub := key.Public().(type) {
case *rsa.PublicKey:
pubKey = packet.NewRSAPublicKey(creationTime, pub)
// for ecdsa/eddsa protonmail openpgp does not support either
// - creating a PublicKey object from an existing key without silly workarounds
// (because the curve defintions are in an internal package)
// - or, more importantly, actually using a crypto.Signer to utilize those keys to sign things
//
// so for now only RSA works.
default:
return nil, errors.New("Unsupported key type")
}
entity := &openpgp.Entity{
PrimaryKey: pubKey,
PrivateKey: &packet.PrivateKey{
PublicKey: *pubKey,
Encrypted: false,
PrivateKey: key,
},
Identities: make(map[string]*openpgp.Identity),
}
isPrimaryID := true
for _, uid := range uids {
sig := &packet.Signature{
SigType: packet.SigTypePositiveCert,
CreationTime: creationTime,
PubKeyAlgo: pubKey.PubKeyAlgo,
Hash: crypto.SHA512,
IsPrimaryId: &isPrimaryID,
FlagsValid: true,
FlagSign: true,
FlagCertify: true,
IssuerKeyId: &pubKey.KeyId,
}
err := sig.SignUserId(uid.Id, entity.PrimaryKey, entity.PrivateKey, nil)
if err != nil {
return nil, err
}
entity.Identities[uid.Id] = &openpgp.Identity{
Name: uid.Name,
UserId: uid,
SelfSignature: sig,
}
}
return entity, nil
}
func newPgpKeyCmd(cmd *cobra.Command, args []string) error {
if argUserName == "" {
return errors.New("--name is required")
}
uid := packet.NewUserId(argUserName, argUserComment, argUserEmail)
if uid == nil {
return errors.New("Invalid user ID")
}
key, err := selectOrGenerate()
if err != nil {
return err
}
entity, err := makeKey(key, []*packet.UserId{uid})
if err != nil {
return err
}
fingerprint := hex.EncodeToString(entity.PrimaryKey.Fingerprint[:])
fmt.Fprintln(os.Stderr, "Token CKA_ID: ", formatKeyID(key.GetID()))
fmt.Fprintln(os.Stderr, "PGP ID: ", strings.ToUpper(fingerprint))
writer, err := armor.Encode(os.Stdout, openpgp.PublicKeyType, nil)
if err != nil {
return err
}
err = entity.Serialize(writer)
if err != nil {
return err
}
writer.Close()
fmt.Println()
return nil
}