internal/Convert-ByteToHexString.ps1

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function Convert-ByteToHexString {
    <#
 .SYNOPSIS
 Converts byte object into hex string
 
 .DESCRIPTION
 Converts byte object ([byte[]]@(1,100,23,54)) into the hex string (e.g. '0x01641736')
 Used when working with SMO logins and their byte parameters: sids and hashed passwords
 
 .PARAMETER InputObject
 Input byte[] object (e.g. [byte[]]@(18,52))
 
 .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-ByteToHexString ([byte[]]@(1,100,23,54))
 
 Returns hex string '0x01641736'
 
 .EXAMPLE
 Convert-ByteToHexString 18,52
 
 Returns hex string '0x1234'
#>

    param ([byte[]]$InputObject)
    $outString = "0x"
    $InputObject | ForEach-Object { $outString += ("{0:X}" -f $_).PadLeft(2, "0") }
    $outString
}