functions/New-DbaServiceMasterKey.ps1

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function New-DbaServiceMasterKey {
<#
    .SYNOPSIS
        Creates a new service master key
 
    .DESCRIPTION
        Creates a new service master key in the master database
 
    .PARAMETER SqlInstance
        The target SQL Server instances
 
    .PARAMETER SqlCredential
        Allows you to login to SQL Server using alternative credentials.
 
    .PARAMETER Password
        Secure string used to create the key.
 
    .PARAMETER WhatIf
        Shows what would happen if the command were to run. No actions are actually performed.
 
    .PARAMETER Confirm
        Prompts you for confirmation before executing any changing operations within the command.
 
    .PARAMETER EnableException
        By default, when something goes wrong we try to catch it, interpret it and give you a friendly warning message.
        This avoids overwhelming you with "sea of red" exceptions, but is inconvenient because it basically disables advanced scripting.
        Using this switch turns this "nice by default" feature off and enables you to catch exceptions with your own try/catch.
 
    .NOTES
        Tags: Certificate
        Author: Chrissy LeMaire (@cl), netnerds.net
 
        Website: https://dbatools.io
        Copyright: (c) 2018 by dbatools, licensed under MIT
        License: MIT https://opensource.org/licenses/MIT
 
    .EXAMPLE
        PS C:\> New-DbaServiceMasterKey -SqlInstance Server1
 
        You will be prompted to securely enter your Service Key Password twice, then a master key will be created in the master database on server1 if it does not exist.
 
#>

    [CmdletBinding(SupportsShouldProcess)]
    param (
        [parameter(Mandatory, ValueFromPipeline)]
        [Alias("ServerInstance", "SqlServer")]
        [DbaInstanceParameter[]]$SqlInstance,
        [PSCredential]$SqlCredential,
        [Security.SecureString]$Password,
        [Alias('Silent')]
        [switch]$EnableException
    )

    process {
        foreach ($instance in $SqlInstance) {
            if (Test-Bound -ParameterName Password -Not) {
                $password = Read-Host -AsSecureString -Prompt "You must enter Service Key password for $instance"
                $password2 = Read-Host -AsSecureString -Prompt "Type the password again"

                if (([System.Runtime.InteropServices.marshal]::PtrToStringAuto([System.Runtime.InteropServices.marshal]::SecureStringToBSTR($password))) -ne ([System.Runtime.InteropServices.marshal]::PtrToStringAuto([System.Runtime.InteropServices.marshal]::SecureStringToBSTR($password2)))) {
                    Stop-Function -Message "Passwords do not match" -Continue
                }
            }
            New-DbaDbMasterKey -SqlInstance $instance -Database master -Password $password
        }
    }
}