WDACConfig

0.3.8

Shared/Compare-SecureString.psm1

                                function Compare-SecureString {

    <#

    .SYNOPSIS

        Safely compares two SecureString objects without decrypting them.

        Outputs $true if they are equal, or $false otherwise.

    .INPUTS

        System.Security.SecureString

    .OUTPUTS

        System.Boolean

    .PARAMETER SecureString1

        First secure string

    .PARAMETER SecureString2

        Second secure string to compare with the first secure string

    #>

    [CmdletBinding()]

    [OutputType([System.Boolean])]

    param(

        [System.Security.SecureString]$SecureString1,

        [System.Security.SecureString]$SecureString2

    )

    try {

        $Bstr1 = [Runtime.InteropServices.Marshal]::SecureStringToBSTR($SecureString1)

        $Bstr2 = [Runtime.InteropServices.Marshal]::SecureStringToBSTR($SecureString2)

        $Length1 = [Runtime.InteropServices.Marshal]::ReadInt32($Bstr1, -4)

        $Length2 = [Runtime.InteropServices.Marshal]::ReadInt32($Bstr2, -4)

        if ( $Length1 -ne $Length2 ) {

            return $false

        }

        for ( $I = 0; $I -lt $Length1; ++$I ) {

            $B1 = [Runtime.InteropServices.Marshal]::ReadByte($Bstr1, $I)

            $B2 = [Runtime.InteropServices.Marshal]::ReadByte($Bstr2, $I)

            if ( $B1 -ne $B2 ) {

                return $false

            }

        }

        return $true

    }

    finally {

        if ( $Bstr1 -ne [IntPtr]::Zero ) {

            [Runtime.InteropServices.Marshal]::ZeroFreeBSTR($Bstr1)

        }

        if ( $Bstr2 -ne [IntPtr]::Zero ) {

            [Runtime.InteropServices.Marshal]::ZeroFreeBSTR($Bstr2)

        }

    }

}

Export-ModuleMember -Function 'Compare-SecureString'

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