file.go

Documentation: github.com/sigstore/rekor/pkg/signer

     1  /*
     2  Copyright The Rekor Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package signer
    18  
    19  import (
    20  	"crypto"
    21  	"fmt"
    22  
    23  	"github.com/sigstore/sigstore/pkg/signature"
    24  	"go.step.sm/crypto/pemutil"
    25  )
    26  
    27  // returns an file based signer and verify, used for spinning up local instances
    28  type File struct {
    29  	signature.SignerVerifier
    30  }
    31  
    32  func NewFile(keyPath, keyPass string) (*File, error) {
    33  	opaqueKey, err := pemutil.Read(keyPath, pemutil.WithPassword([]byte(keyPass)))
    34  	if err != nil {
    35  		return nil, fmt.Errorf("file: provide a valid signer, %s is not valid: %w", keyPath, err)
    36  	}
    37  
    38  	signer, err := signature.LoadSignerVerifier(opaqueKey, crypto.SHA256)
    39  	if err != nil {
    40  		return nil, fmt.Errorf(`file: loaded private key from %s can't be used to sign: %w`, keyPath, err)
    41  	}
    42  	return &File{signer}, nil
    43  }
    44
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