You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: v1header.go
    path of file: ./repos/podman/vendor/github.com/containers/luksy
    
    the code of the file until where you have to start completion: package luksy

import (
	"encoding/binary"
	"fmt"
	"syscall"
)

type (
	V1Header  [592]uint8
	V1KeySlot [48]uint8
)

const (
	// Mostly verbatim from LUKS1 On-Disk Format Specification version 1.2.3
	V1Magic   
    
func (h *V1Header) KeySlot(slot int) (V1KeySlot, error) {
	var ks V1KeySlot
	if slot < 0 || slot >= v1NumKeys {
		return ks, fmt.Errorf("invalid key slot number (must be 0..%d)", v1NumKeys-1)
	}
	switch slot {
	case 0:
		copy(ks[:], h[v1KeySlot1Start:v1KeySlot1Start+v1KeySlot1Length])
	case 1:
		copy(ks[:], h[v1KeySlot2Start:v1KeySlot2Start+v1KeySlot2Length])
	case 2:
		copy(ks[:], h[v1KeySlot3Start:v1KeySlot3Start+v1KeySlot3Length])
	case 3:
		copy(ks[:], h[v1KeySlot4Start:v1KeySlot4Start+v1KeySlot4Length])
	case 4:
		copy(ks[:], h[v1KeySlot5Start:v1KeySlot5Start+v1KeySlot5Length])
	case 5:
		copy(ks[:], h[v1KeySlot6Start:v1KeySlot6Start+v1KeySlot6Length])
	case 6:
		copy(ks[:], h[v1KeySlot7Start:v1KeySlot7Start+v1KeySlot7Length])
	case 7:
		copy(ks[:], h[v1KeySlot8Start:v1KeySlot8Start+v1KeySlot8Length])
	}
	return ks, nil
}