FIPS Compliance Error

[CodyRWhite]

Updated SHA256 object creation to be FIPS compliant.

When running this script on a FIPS enforced machine the following error occurs

New-Object : Exception calling ".ctor" with "0" argument(s): "This implementation is not part of the Windows Platform FIPS validated cryptographic algorithms."
At C:\ProgramData\CloudLAPS Client\CLAPS_Client.ps1:212 char:50
+ ... 56Managed = New-Object -TypeName "System.Security.Cryptography.SHA256 ...
+                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (:) [New-Object], MethodInvocationException
    + FullyQualifiedErrorId : ConstructorInvokedThrowException,Microsoft.PowerShell.Commands.NewObjectCommand

You cannot call a method on a null-valued expression.
At C:\ProgramData\CloudLAPS Client\CLAPS_Client.ps1:221 char:33
+ ...             [byte[]]$ComputedHash = $SHA256Managed.ComputeHash($Encod ...
+                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (:) [], RuntimeException
    + FullyQualifiedErrorId : InvokeMethodOnNull

Exception calling "SignHash" with "3" argument(s): "Value cannot be null.
Parameter name: hash"
At C:\ProgramData\CloudLAPS Client\CLAPS_Client.ps1:224 char:33
+ ...             [byte[]]$SignatureSigned = $RSAPrivateKey.SignHash($Compu ...
+                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
    + FullyQualifiedErrorId : ArgumentNullException

Exception calling "ToBase64String" with "1" argument(s): "Value cannot be null.
Parameter name: inArray"
At C:\ProgramData\CloudLAPS Client\CLAPS_Client.ps1:227 char:33
+ ...             $SignatureString = [System.Convert]::ToBase64String($Sign ...
+                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
    + FullyQualifiedErrorId : ArgumentNullException