Functions/New-RandomPassword.ps1
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function New-RandomPassword { <# .SYNOPSIS Creates a new random password .DESCRIPTION Creates a new random password. Parameters can be passed to determine minimum and maximum password lengths, whether to avoid characters that are similar to one another or to limit it to readable words .PARAMETER MinLength Integer representing minimum password length, valid range 8-102 characters .PARAMETER MaxLength Integer representing maximum password length, valid range 8-102 characters .PARAMETER NonAlphaChars Integer representing the number of non alphabetic characters .PARAMETER Readable Switch indicating to use combinations of short English words. Default behavior is to output a truly random string of characters .PARAMETER AvoidSimilar Switch to prevent characters that are similar to one another to be included. For instance 1, l, I .EXAMPLE New-RandomPassword e8P!VKyO .EXAMPLE New-RandomPassword -MinLength 16 -AvoidSimilar RK##L@qFT5(3BArM .EXAMPLE New-RandomPassword -Readable -MinLength 8 eLFcUB7; .EXAMPLE New-RandomPassword -MinLength 16 -AvoidSimilar -Readable and%6CRaBbuLLwan .EXAMPLE New-RandomPassword -MinLength 16 -MaxLength 20 -Readable -AvoidSimilar ViEWpewhead9)chEF #> #region parameter [CmdletBinding(DefaultParameterSetName = 'Web', ConfirmImpact = 'None')] [Diagnostics.CodeAnalysis.SuppressMessageAttribute('PSReviewUnusedParameter', '')] [Diagnostics.CodeAnalysis.SuppressMessageAttribute('PSUseShouldProcessForStateChangingFunctions', '')] [OutputType('string')] Param ( [Parameter(ParameterSetName = 'Web')] [Parameter(ParameterSetName = 'Readable')] [ValidateRange(8, 102)] [int] $MinLength = 12, [Parameter(ParameterSetName = 'Web')] [Parameter(ParameterSetName = 'Readable')] [ValidateRange(8, 102)] [int] $MaxLength, [Parameter(ParameterSetName = 'Web')] [int] $NonAlphaChars, [Parameter(ParameterSetName = 'Readable')] [switch] $Readable, [Parameter(ParameterSetName = 'Web')] [Parameter(ParameterSetName = 'Readable')] [switch] $AvoidSimilar ) #endregion parameter begin { Write-Verbose -Message "Starting [$($MyInvocation.Mycommand)]" Write-Verbose -Message "ParameterSetName [$($PsCmdlet.ParameterSetName)]" $SimilarRegex = '\+|''|\-|0|1|I|O|_|`|l|o|t|\|' Write-Verbose -Message "SimilarRegex = [$SimilarRegex]" if (-not $MaxLength) { $MaxLength = $MinLength } switch ($PsCmdlet.ParameterSetName) { 'Web' { } 'Readable' { $Symbol = Get-PrintableAscii -Verbose:$false | Where-Object { $_.Class -eq 's' } $MaxWords = [int] ($MaxLength / 3) $MinWords = [int] ($MinLength / 4) $TwoOrThree = Get-WordList -Verbose:$false | Where-Object { $_.Length -eq 3 -or $_.Length -eq 4 } $Sample = $TwoOrThree | Get-Random -Count ($MinWords * 30) -Verbose:$false | Format-RandomCase -Verbose:$false } } } process { switch ($PsCmdlet.ParameterSetName) { 'Web' { if (-not $NonAlphaChars) { $NonAlphaChars = 0 } if ($MinLength -eq $MaxLength) { $Length = $MinLength } else { $Length = Get-Random -Minimum $MinLength -Maximum ($MaxLength + 1) } do { if (-not $AvoidSimilar) { $ReturnVal = [System.Web.Security.Membership]::GeneratePassword($Length, $nonAlphaChars) Write-Verbose -Message "PW is [$ReturnVal]" } else { do { Write-Verbose -Message 'in do' $ReturnVal = [System.Web.Security.Membership]::GeneratePassword($Length, $nonAlphaChars) Write-Verbose -Message "PW is [$ReturnVal]" } until (-not ($ReturnVal -cmatch $SimilarRegex)) } } until (($ReturnVal.Length -ge $MinLength) -and ($ReturnVal.Length -le $MaxLength)) $ReturnVal } 'Readable' { do { if (-not $AvoidSimilar) { $RandomSymbol = $Symbol.Char | Get-Random -Verbose:$false $RandomDigit = 0..9 | Get-Random -Verbose:$false $curWords = Get-Random -Minimum $MinWords -Maximum ($MaxWords + 1) -Verbose:$false Write-Verbose -Message "Symbol [$RandomSymbol] Digit [$RandomDigit]" $ReturnVal = ( @(($Sample | Get-Random -Count $curWords -Verbose:$false), $RandomDigit, $RandomSymbol) | Get-Random -Count ($curWords + 2)) -join '' } else { $RandomSymbol = $Symbol.Char | Where-Object { -not ($_ -cmatch $SimilarRegex) } | Get-Random -Verbose:$false $RandomDigit = 0..9 | Where-Object { -not ($_ -cmatch $SimilarRegex) } | Get-Random -Verbose:$false $curWords = Get-Random -Minimum $MinWords -Maximum ($MaxWords + 1) -Verbose:$false $Sample = $Sample | Where-Object { -not ($_ -cmatch $SimilarRegex) } $ReturnVal = ( @(($Sample | Get-Random -Count $curWords -Verbose:$false), $RandomDigit, $RandomSymbol) | Get-Random -Count ($curWords + 2)) -join '' } } until (($ReturnVal.Length -ge $MinLength) -and ($ReturnVal.Length -le $MaxLength)) $ReturnVal } } } end { Write-Verbose -Message "Ending [$($MyInvocation.Mycommand)]" } } |