working commit

vendor/github.com/google/go-containerregistry/internal/verify/verify.go

@@ -1,122 +0,0 @@
-// Copyright 2020 Google LLC All Rights Reserved.
-//
-// 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 verify provides a ReadCloser that verifies content matches the
-// expected hash values.
-package verify
-
-import (
-	"bytes"
-	"encoding/hex"
-	"errors"
-	"fmt"
-	"hash"
-	"io"
-
-	"github.com/google/go-containerregistry/internal/and"
-	v1 "github.com/google/go-containerregistry/pkg/v1"
-)
-
-// SizeUnknown is a sentinel value to indicate that the expected size is not known.
-const SizeUnknown = -1
-
-type verifyReader struct {
-	inner             io.Reader
-	hasher            hash.Hash
-	expected          v1.Hash
-	gotSize, wantSize int64
-}
-
-// Error provides information about the failed hash verification.
-type Error struct {
-	got     string
-	want    v1.Hash
-	gotSize int64
-}
-
-func (v Error) Error() string {
-	return fmt.Sprintf("error verifying %s checksum after reading %d bytes; got %q, want %q",
-		v.want.Algorithm, v.gotSize, v.got, v.want)
-}
-
-// Read implements io.Reader
-func (vc *verifyReader) Read(b []byte) (int, error) {
-	n, err := vc.inner.Read(b)
-	vc.gotSize += int64(n)
-	if err == io.EOF {
-		if vc.wantSize != SizeUnknown && vc.gotSize != vc.wantSize {
-			return n, fmt.Errorf("error verifying size; got %d, want %d", vc.gotSize, vc.wantSize)
-		}
-		got := hex.EncodeToString(vc.hasher.Sum(nil))
-		if want := vc.expected.Hex; got != want {
-			return n, Error{
-				got:     vc.expected.Algorithm + ":" + got,
-				want:    vc.expected,
-				gotSize: vc.gotSize,
-			}
-		}
-	}
-	return n, err
-}
-
-// ReadCloser wraps the given io.ReadCloser to verify that its contents match
-// the provided v1.Hash before io.EOF is returned.
-//
-// The reader will only be read up to size bytes, to prevent resource
-// exhaustion. If EOF is returned before size bytes are read, an error is
-// returned.
-//
-// A size of SizeUnknown (-1) indicates disables size verification when the size
-// is unknown ahead of time.
-func ReadCloser(r io.ReadCloser, size int64, h v1.Hash) (io.ReadCloser, error) {
-	w, err := v1.Hasher(h.Algorithm)
-	if err != nil {
-		return nil, err
-	}
-	r2 := io.TeeReader(r, w) // pass all writes to the hasher.
-	if size != SizeUnknown {
-		r2 = io.LimitReader(r2, size) // if we know the size, limit to that size.
-	}
-	return &and.ReadCloser{
-		Reader: &verifyReader{
-			inner:    r2,
-			hasher:   w,
-			expected: h,
-			wantSize: size,
-		},
-		CloseFunc: r.Close,
-	}, nil
-}
-
-// Descriptor verifies that the embedded Data field matches the Size and Digest
-// fields of the given v1.Descriptor, returning an error if the Data field is
-// missing or if it contains incorrect data.
-func Descriptor(d v1.Descriptor) error {
-	if d.Data == nil {
-		return errors.New("error verifying descriptor; Data == nil")
-	}
-
-	h, sz, err := v1.SHA256(bytes.NewReader(d.Data))
-	if err != nil {
-		return err
-	}
-	if h != d.Digest {
-		return fmt.Errorf("error verifying Digest; got %q, want %q", h, d.Digest)
-	}
-	if sz != d.Size {
-		return fmt.Errorf("error verifying Size; got %d, want %d", sz, d.Size)
-	}
-
-	return nil
-}