func ROTR32(v uint32, n uint32) uint32 {
	return (v >> n) | (v << (32 - n))
}
ROTR32 - rotates a byte right (same as (32 - n) left)
package donut
import (
	"bufio"
	"bytes"
	"encoding/binary"
)
const (
	CipherBlockLen = uint32(128 / 8)
	CipherKeyLen = uint32(128 / 8)
)