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package utils
import (
"crypto/hmac"
"encoding/hex"
"errors"
"fmt"
gopath "path"
"path/filepath"
"github.com/endophage/gotuf/data"
)
var ErrWrongLength = errors.New("wrong length")
type ErrWrongHash struct {
Type string
Expected []byte
Actual []byte
}
func (e ErrWrongHash) Error() string {
return fmt.Sprintf("wrong %s hash, expected %#x got %#x", e.Type, e.Expected, e.Actual)
}
type ErrNoCommonHash struct {
Expected data.Hashes
Actual data.Hashes
}
func (e ErrNoCommonHash) Error() string {
types := func(a data.Hashes) []string {
t := make([]string, 0, len(a))
for typ := range a {
t = append(t, typ)
}
return t
}
return fmt.Sprintf("no common hash function, expected one of %s, got %s", types(e.Expected), types(e.Actual))
}
type ErrUnknownHashAlgorithm struct {
Name string
}
func (e ErrUnknownHashAlgorithm) Error() string {
return fmt.Sprintf("unknown hash algorithm: %s", e.Name)
}
type PassphraseFunc func(role string, confirm bool) ([]byte, error)
func FileMetaEqual(actual data.FileMeta, expected data.FileMeta) error {
if actual.Length != expected.Length {
return ErrWrongLength
}
hashChecked := false
for typ, hash := range expected.Hashes {
if h, ok := actual.Hashes[typ]; ok {
hashChecked = true
if !hmac.Equal(h, hash) {
return ErrWrongHash{typ, hash, h}
}
}
}
if !hashChecked {
return ErrNoCommonHash{expected.Hashes, actual.Hashes}
}
return nil
}
func NormalizeTarget(path string) string {
return gopath.Join("/", path)
}
func HashedPaths(path string, hashes data.Hashes) []string {
paths := make([]string, 0, len(hashes))
for _, hash := range hashes {
hashedPath := filepath.Join(filepath.Dir(path), hex.EncodeToString(hash)+"."+filepath.Base(path))
paths = append(paths, hashedPath)
}
return paths
}
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