internal/Convert-HexStringToByte.ps1

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function Convert-HexStringToByte {
    <#
 .SYNOPSIS
 Converts hex string into byte object
 
 .DESCRIPTION
 Converts hex string (e.g. '0x01641736') into the byte object ([byte[]]@(1,100,23,54))
 Used when working with SMO logins and their byte parameters: sids and hashed passwords
 
 .PARAMETER InputObject
 Input hex string (e.g. '0x1234' or 'DBA2FF')
 
 .NOTES
 Tags: Login, Internal
 Author: Kirill Kravtsov (@nvarscar)
 dbatools PowerShell module (https://dbatools.io, clemaire@gmail.com)
 Copyright (C) 2016 Chrissy LeMaire
 License: GNU GPL v3 https://opensource.org/licenses/GPL-3.0
 
 .EXAMPLE
 Convert-HexStringToByte '0x01641736'
 
 Returns byte[] object [byte[]]@(1,100,23,54)
 
 .EXAMPLE
 Convert-HexStringToByte '1234'
 
 Returns byte[] object [byte[]]@(18,52)
#>

    param (
        [string]$InputObject
    )
    $hexString = $InputObject.TrimStart("0x")
    if ($hexString.Length % 2 -eq 1) { $hexString = '0' + $hexString }
    [byte[]]$outByte = $null; $outByte += 0 .. (($hexString.Length) / 2 - 1) | ForEach-Object { [Int16]::Parse($hexString.Substring($_ * 2, 2), 'HexNumber') }
    Return $outByte
}