Re: .NET CryptoAPITransform and KeyHandle interop

From: Ivan Medvedev [MS] (ivanmed_at_online.microsoft.com)
Date: 12/19/03

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    Michel -
    it depends on the version. In Whidbey (tech preview was made available at
    the PDC) this will be specified with CspProviderFlags.
    --Ivan
    http://blogs.dotnetthis.com/ivan

    "Michel Gallant" <neutron@NOSPAMistar.ca> wrote in message
    news:OX0YyZXxDHA.3220@tk2msftngp13.phx.gbl...
    > I understand that CryptoAPITransform.KeyHandle returns a
    > handle to the native symmetric key handle (for underlying capi
    > CSP like RC2, TripleDES etc..)
    >
    > There is no problem acquiring such a keyhandle in managed code:
    >
    > CryptoAPITransform capitrans = (CryptoAPITransform) encryptor ;
    > IntPtr hsymkey = capitrans.KeyHandle ; //native key handle
    >
    > but this keyhandle fails when supplied to CryptoAPI functions via Pinvoke
    > (typically with Bad Key error).
    > Anyone with experience here?
    >
    > Is the underlying SymmetricAlgorithm keyhandle marked as "Exportable" in
    > capi? SymmetricAlgorithm classes don't seem to have properties that allow
    > controlling some dwFlags that CryptoGenKey() does.
    >
    > Thanks,
    > - Mitch Gallant
    > MVP Security
    >
    >

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