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bb63d7e60e
Co-authored-by: Rishichandra Wawhal <rishichandra.wawhal@gmail.com> Co-authored-by: Rikin Kachhia <54616969+rikinsk@users.noreply.github.com> Co-authored-by: Aravind <aravindkp@outlook.in> Co-authored-by: Anon Ray <ecthiender@users.noreply.github.com> Co-authored-by: Shahidh K Muhammed <muhammedshahid.k@gmail.com>
55 lines
1.3 KiB
Go
55 lines
1.3 KiB
Go
// Copyright 2019 The Kubernetes Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package download
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import (
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"bytes"
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"crypto/sha256"
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"encoding/hex"
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"hash"
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"io"
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"github.com/pkg/errors"
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)
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// Verifier can check a reader against it's correctness.
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type Verifier interface {
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io.Writer
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Verify() error
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}
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var _ Verifier = sha256Verifier{}
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type sha256Verifier struct {
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hash.Hash
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wantedHash []byte
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}
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// NewSha256Verifier creates a Verifier that tests against the given hash.
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func NewSha256Verifier(hashed string) Verifier {
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raw, _ := hex.DecodeString(hashed)
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return sha256Verifier{
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Hash: sha256.New(),
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wantedHash: raw,
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}
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}
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func (v sha256Verifier) Verify() error {
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if bytes.Equal(v.wantedHash, v.Sum(nil)) {
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return nil
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}
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return errors.Errorf("checksum does not match, want: %x, got %x", v.wantedHash, v.Sum(nil))
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}
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