SSHSecure/sshkeys/bufutils.go

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/*
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
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import (
`encoding/binary`
`github.com/go-restruct/restruct`
)
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// These are just here to save some typing.
func getBytelenStr(s string) []byte {
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return getBytelenByteArr([]byte(s))
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}
func getBytelenByteArr(b []byte) []byte {
return getByteInt(len(b))
}
func getByteInt(i int) []byte {
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// 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
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}
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func getSingleByteInt(i int) []byte {
return []byte{byte(uint32(i))}
}