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// Copyright 2022 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 signer
import (
"crypto"
"crypto/ecdsa"
"crypto/ed25519"
"crypto/rsa"
"fmt"
"github.com/sigstore/sigstore/pkg/signature"
"go.step.sm/crypto/pemutil"
)
// File returns a file-based signer and verifier, used for local testing
type File struct {
crypto.Signer
}
func NewFileSigner(keyPath, keyPass string, hash crypto.Hash) (*File, error) {
opaqueKey, err := pemutil.Read(keyPath, pemutil.WithPassword([]byte(keyPass)))
if err != nil {
return nil, fmt.Errorf("file: provide a valid signer, %s is not valid: %w", keyPath, err)
}
// Cannot use signature.LoadSignerVerifier because the SignerVerifier interface does not extend crypto.Signer
switch pk := opaqueKey.(type) {
case *rsa.PrivateKey:
signer, err := signature.LoadRSAPKCS1v15SignerVerifier(pk, hash)
if err != nil {
return nil, err
}
return &File{signer}, nil
case *ecdsa.PrivateKey:
signer, err := signature.LoadECDSASignerVerifier(pk, hash)
if err != nil {
return nil, err
}
return &File{signer}, nil
case ed25519.PrivateKey:
signer, err := signature.LoadED25519SignerVerifier(pk)
if err != nil {
return nil, err
}
return &File{signer}, nil
default:
return nil, fmt.Errorf("unsupported private key type, must be RSA, ECDSA, or ED25519")
}
}
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