SP2013: get managed accounts passwords

function Bindings(){
    return [System.Reflection.BindingFlags]::CreateInstance -bor
    [System.Reflection.BindingFlags]::GetField -bor
    [System.Reflection.BindingFlags]::Instance -bor
    [System.Reflection.BindingFlags]::NonPublic;
}

function GetFieldValue([object]$o, [string]$fieldName){
    $bindings = Bindings;
    return $o.GetType().GetField($fieldName, $bindings).GetValue($o);
}
function ConvertTo-UnsecureString([System.Security.SecureString]$string){
    $intptr = [System.IntPtr]::Zero;
    $unmanagedString = [System.Runtime.InteropServices.Marshal]::SecureStringToGlobalAllocUnicode($string);
    $unsecureString = [System.Runtime.InteropServices.Marshal]::PtrToStringUni($unmanagedString);
    [System.Runtime.InteropServices.Marshal]::ZeroFreeGlobalAllocUnicode($unmanagedString);
    return $unsecureString;
}
Get-SPManagedAccount | % { "$($_.UserName): $(ConvertTo-UnsecureString (GetFieldValue $_ 'm_Password').SecureStringValue)" }