SSHSecure/sshkeys/bufutils.go

/*
   SSHSecure - a program to harden OpenSSH from defaults
   Copyright (C) 2020  Brent Saner

   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <https://www.gnu.org/licenses/>.
*/

package sshkeys

import (
	`encoding/binary`

	`github.com/go-restruct/restruct`
)

// These are just here to save  some typing.
func getBytelenStr(s string) []byte {
	return getBytelenByteArr([]byte(s))
}

func getBytelenByteArr(b []byte) []byte {
	return getByteInt(len(b))
}

func getByteInt(i int) []byte {
	// This does not work. Despite being a uint32, golang always only writes it as 1 byte instead of 4.
	// ...Despite it occupying 4 bytes in RAM.
	// Luckily we can reuse this quick one-liner in getSingleByteInt().
	// return []byte{byte(i)}
	b := make([]byte, 4)
	b, _ = restruct.Pack(binary.BigEndian, uint32(i))
	return b
}

func getSingleByteInt(i int) []byte {
	return []byte{byte(uint32(i))}
}