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key_loader.go
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/
key_loader.go
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// Copyright 2020 Anapaya Systems
//
// 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 trust
import (
"context"
"crypto"
"crypto/x509"
"encoding/pem"
"os"
"path/filepath"
"github.com/scionproto/scion/pkg/log"
)
// LoadingRing is a key ring that loads the private keys from the configured
// directory.
type LoadingRing struct {
Dir string
}
// PrivateKeys loads all private keys that are in PKCS#8 format from the directory.
func (r LoadingRing) PrivateKeys(ctx context.Context) ([]crypto.Signer, error) {
files, err := filepath.Glob(filepath.Join(r.Dir, "*.key"))
if err != nil {
return nil, err
}
var signers []crypto.Signer
for _, file := range files {
raw, err := os.ReadFile(file)
if err != nil {
log.FromCtx(ctx).Info("Error reading key file", "file", file, "err", err)
continue
}
block, _ := pem.Decode(raw)
if block == nil || block.Type != "PRIVATE KEY" {
continue
}
key, err := x509.ParsePKCS8PrivateKey(block.Bytes)
if err != nil {
continue
}
signer, ok := key.(crypto.Signer)
if !ok {
continue
}
signers = append(signers, signer)
}
return signers, nil
}