functions/Get-DbaDbMasterKey.ps1

function Get-DbaDbMasterKey {
    <#
    .SYNOPSIS
        Gets specified database master key
 
    .DESCRIPTION
        Gets specified database master key
 
    .PARAMETER SqlInstance
        The target SQL Server instance
 
    .PARAMETER SqlCredential
        Login to the target instance using alternative credentials. Accepts PowerShell credentials (Get-Credential).
 
        Windows Authentication, SQL Server Authentication, Active Directory - Password, and Active Directory - Integrated are all supported.
 
        For MFA support, please use Connect-DbaInstance.
 
    .PARAMETER Database
        Get master key from specific database
 
    .PARAMETER ExcludeDatabase
        The database(s) to exclude - this list is auto-populated from the server
 
    .PARAMETER InputObject
        Database object piped in from Get-DbaDatabase
 
    .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, Database
        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
 
    .LINK
        https://dbatools.io/Get-DbaDbMasterKey
 
    .EXAMPLE
        PS C:\> Get-DbaDbMasterKey -SqlInstance sql2016
 
        Gets all master database keys
 
    .EXAMPLE
        PS C:\> Get-DbaDbMasterKey -SqlInstance Server1 -Database db1
 
        Gets the master key for the db1 database
 
    #>

    [CmdletBinding()]
    param (
        [DbaInstanceParameter[]]$SqlInstance,
        [PSCredential]$SqlCredential,
        [string[]]$Database,
        [string[]]$ExcludeDatabase,
        [parameter(ValueFromPipeline)]
        [Microsoft.SqlServer.Management.Smo.Database[]]$InputObject,
        [switch]$EnableException
    )

    process {
        if ($SqlInstance) {
            $InputObject += Get-DbaDatabase -SqlInstance $SqlInstance -Database $Database -ExcludeDatabase $ExcludeDatabase -SqlCredential $SqlCredential
        }

        foreach ($db in $InputObject) {
            if (!$db.IsAccessible) {
                Write-Message -Level Warning -Message "Database $db on $($db.Parent) is not accessible. Skipping."
                continue
            }

            $masterkey = $db.MasterKey

            if (!$masterkey) {
                Write-Message -Message "No master key exists in the $db database on $instance" -Target $db -Level Verbose
                continue
            }

            Add-Member -Force -InputObject $masterkey -MemberType NoteProperty -Name ComputerName -value $db.Parent.ComputerName
            Add-Member -Force -InputObject $masterkey -MemberType NoteProperty -Name InstanceName -value $db.Parent.ServiceName
            Add-Member -Force -InputObject $masterkey -MemberType NoteProperty -Name SqlInstance -value $db.Parent.DomainInstanceName
            Add-Member -Force -InputObject $masterkey -MemberType NoteProperty -Name Database -value $db.Name

            Select-DefaultView -InputObject $masterkey -Property ComputerName, InstanceName, SqlInstance, Database, CreateDate, DateLastModified, IsEncryptedByServer
        }
    }
}
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