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/*-
* Copyright 2019 Square 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 main
import (
"crypto"
"encoding/base64"
"errors"
"fmt"
"github.com/go-jose/go-jose/jose-util/generator"
"github.com/go-jose/go-jose/v3"
)
func generate() {
var privKey crypto.PrivateKey
var pubKey crypto.PublicKey
var err error
switch *generateUseFlag {
case "sig":
pubKey, privKey, err = generator.NewSigningKey(jose.SignatureAlgorithm(*generateAlgFlag), *generateKeySizeFlag)
case "enc":
pubKey, privKey, err = generator.NewEncryptionKey(jose.KeyAlgorithm(*generateAlgFlag), *generateKeySizeFlag)
default:
// According to RFC 7517 section-8.2. This is unlikely to change in the
// near future. If it were, new values could be found in the registry under
// "JSON Web Key Use": https://www.iana.org/assignments/jose/jose.xhtml
app.FatalIfError(errors.New("invalid key use. Must be \"sig\" or \"enc\""), "unable to generate key")
}
app.FatalIfError(err, "unable to generate key")
kid := *generateKeyIdentFlag
priv := jose.JSONWebKey{Key: privKey, KeyID: kid, Algorithm: *generateAlgFlag, Use: *generateUseFlag}
// Generate a canonical kid based on RFC 7638
if kid == "" {
thumb, err := priv.Thumbprint(crypto.SHA256)
app.FatalIfError(err, "unable to compute thumbprint")
kid = base64.URLEncoding.EncodeToString(thumb)
priv.KeyID = kid
}
// I'm not sure why we couldn't use `pub := priv.Public()` here as the private
// key should contain the public key. In case for some reason it doesn't,
// this builds a public JWK from scratch.
pub := jose.JSONWebKey{Key: pubKey, KeyID: kid, Algorithm: *generateAlgFlag, Use: *generateUseFlag}
if priv.IsPublic() || !pub.IsPublic() || !priv.Valid() || !pub.Valid() {
app.Fatalf("invalid keys were generated")
}
privJSON, err := priv.MarshalJSON()
app.FatalIfError(err, "failed to marshal private key to JSON")
pubJSON, err := pub.MarshalJSON()
app.FatalIfError(err, "failed to marshal public key to JSON")
name := fmt.Sprintf("jwk-%s-%s", *generateUseFlag, kid)
pubFile := fmt.Sprintf("%s-pub.json", name)
privFile := fmt.Sprintf("%s-priv.json", name)
err = writeNewFile(pubFile, pubJSON, 0444)
app.FatalIfError(err, "error on write to file %s", pubFile)
err = writeNewFile(privFile, privJSON, 0400)
app.FatalIfError(err, "error on write to file %s", privFile)
}
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