Simple PowerShell password generator

New-Password.ps1

[CmdletBinding(DefaultParameterSetName='Normal')]
param(

    [Parameter()]
    [Int32]$Length = 8,

    [Parameter(ParameterSetName="Complex")]
    [Switch]$Complex,

    [Parameter(ParameterSetName="Easy")]
    [Switch]$Easy

)

begin {
    
    $Upper = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
    $Lower = 'abcdefghijklmnopqrstuvwxyz'
    $Digits = '01234567890'
    $Special = '~!@#$%^&*()-_+=/\.'

    $RandomGen = New-Object System.Random

}

process {

    $Password = ''

    switch ($PSCmdlet.ParameterSetName) {

        'Easy' {

            $Password += $Upper[$RandomGen.Next($Upper.Length)]

            while ($Password.Length -lt ($Length / 2)) {
                $Password += $Lower[$RandomGen.Next($Lower.Length)]
            }

            while ($Password.Length -lt $Length) {
                $Password += $Digits[$RandomGen.Next($Digits.Length)]
            }

        }

        'Normal' {
            $CharSet = "$Upper$Lower$Digits$Digits$Digits"
            while ($Password.Length -lt $Length) {
                $Password += $CharSet[$RandomGen.Next($CharSet.Length)]
            }
        }

        'Complex' {
            $CharSet = "$Upper$Lower$Digits$Digits$Digits$Special$Special$Special"
            while ($Password.Length -lt $Length) {
                $Password += $CharSet[$RandomGen.Next($CharSet.Length)]
            }
        }

    }

    Return $Password

}