github.com/1aal/kubeblocks@v0.0.0-20231107070852-e1c03e598921/pkg/cli/cmd/plugin/download/verifier.go (about)

     1  // Copyright 2019 The Kubernetes Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //      http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package download
    16  
    17  import (
    18  	"bytes"
    19  	"crypto/sha256"
    20  	"encoding/hex"
    21  	"hash"
    22  	"io"
    23  
    24  	"github.com/pkg/errors"
    25  	"k8s.io/klog/v2"
    26  )
    27  
    28  type Verifier interface {
    29  	io.Writer
    30  	Verify() error
    31  }
    32  
    33  var _ Verifier = sha256Verifier{}
    34  
    35  type sha256Verifier struct {
    36  	hash.Hash
    37  	wantedHash []byte
    38  }
    39  
    40  // NewSha256Verifier creates a Verifier that tests against the given hash.
    41  func NewSha256Verifier(hashed string) Verifier {
    42  	raw, _ := hex.DecodeString(hashed)
    43  	return sha256Verifier{
    44  		Hash:       sha256.New(),
    45  		wantedHash: raw,
    46  	}
    47  }
    48  
    49  func (v sha256Verifier) Verify() error {
    50  	klog.V(1).Infof("Compare sha256 (%s) signed version", hex.EncodeToString(v.wantedHash))
    51  	if bytes.Equal(v.wantedHash, v.Sum(nil)) {
    52  		return nil
    53  	}
    54  	return errors.Errorf("checksum does not match, want: %x, got %x", v.wantedHash, v.Sum(nil))
    55  }