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// Copyright 2021 The Sigstore Authors.
//
// 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 fileca
import (
"bytes"
"crypto"
"crypto/x509"
"errors"
"os"
"path/filepath"
"github.com/sigstore/fulcio/pkg/ca"
"github.com/sigstore/sigstore/pkg/cryptoutils"
"go.step.sm/crypto/pemutil"
)
func loadKeyPair(certPath, keyPath, keyPass string) (*ca.SignerCertsMutex, error) {
var (
certs []*x509.Certificate
err error
key crypto.Signer
)
data, err := os.ReadFile(filepath.Clean(certPath))
if err != nil {
return nil, err
}
certs, err = cryptoutils.LoadCertificatesFromPEM(bytes.NewReader(data))
if err != nil {
return nil, err
}
{
opaqueKey, err := pemutil.Read(keyPath, pemutil.WithPassword([]byte(keyPass)))
if err != nil {
return nil, err
}
var ok bool
key, ok = opaqueKey.(crypto.Signer)
if !ok {
return nil, errors.New(`fileca: loaded private key can't be used to sign`)
}
}
if err := ca.VerifyCertChain(certs, key); err != nil {
return nil, err
}
return &ca.SignerCertsMutex{Certs: certs, Signer: key}, nil
}
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