checksum

type Verifier interface {
	// Wrap returns an io.ReadCloser that transparently verifies the checksum
	// when the returned reader is closed. This enables streaming verification
	// without buffering the entire content in memory.
	Wrap(io.ReadCloser, string) io.ReadCloser

	// ComputeAndWrap returns a reader that computes the checksum while reading.
	ComputeAndWrap(r io.Reader) (wrappedReader io.Reader, getHash func() (string, error))
}