New-AzureAdClientCertificate.ps1
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.SYNOPSIS Generate Client Certificate on local machine for application registration or service principal in Azure AD. .EXAMPLE PS C:\>New-AzureAdClientCertificate -ApplicationName MyApp Generates a new client certificate for application named "MyApp". .EXAMPLE PS C:\>New-AzureAdClientCertificate -ApplicationName MyApp -MakePrivateKeyExportable -Lifetime (New-TimeSpan -End (Get-Date).AddYears(3)) Generates a new exportable client certificate valid for 3 years. #> function New-AzureAdClientCertificate { [CmdletBinding()] [OutputType([securestring])] param ( # Name of Application. [Parameter(Mandatory=$true, ValueFromPipeline=$true)] [string] $ApplicationName, # Allows certificate private key to be exported from local machine. [Parameter(Mandatory=$false)] [switch] $MakePrivateKeyExportable, # Valid lifetime of client certificate. [Parameter(Mandatory=$false)] [timespan] $Lifetime ) begin { ## Initialize [string] $KeyExportPolicy = 'NonExportable' if ($MakePrivateKeyExportable) { $KeyExportPolicy = 'ExportableEncrypted' } [datetime] $StartTime = Get-Date if (!$Lifetime) { $Lifetime = New-TimeSpan -End $StartTime.AddYears(1) } [datetime] $EndTime = $StartTime.Add($Lifetime) } process { [System.Security.Cryptography.X509Certificates.X509Certificate2] $ClientCertificate = New-SelfSignedCertificate -Subject ('CN={0}' -f $ApplicationName) -KeyFriendlyName $ApplicationName -HashAlgorithm sha256 -KeySpec Signature -KeyLength 2048 -Type Custom -NotBefore $StartTime -NotAfter $EndTime -KeyExportPolicy $KeyExportPolicy -CertStoreLocation Cert:\CurrentUser\My Write-Output $ClientCertificate } } # SIG # Begin signature block # MIIZrAYJKoZIhvcNAQcCoIIZnTCCGZkCAQExDzANBglghkgBZQMEAgEFADB5Bgor # BgEEAYI3AgEEoGswaTA0BgorBgEEAYI3AgEeMCYCAwEAAAQQH8w7YFlLCE63JNLG # KX7zUQIBAAIBAAIBAAIBAAIBADAxMA0GCWCGSAFlAwQCAQUABCDJ357Fl5t5b3qF # 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