Need help with a rsaenh bug

Daniel Jeliński djelinski1 at
Fri Jun 28 03:47:36 CDT 2013

Hi Qian Hong,
I'm not convinced that a failed call to CryptDecrypt actually resets
the key state. It's also possible that CryptDecrypt returns FALSE
before even trying to decrypt if data length is invalid. To check it,
you would need to change the key state by (successfully) calling
CryptDecrypt with Final=FALSE before your test. Could you add such

2013/6/28, Qian Hong <fracting at>:
> Hi Daniel,
> On Fri, Jun 28, 2013 at 3:43 AM, Daniel Jeliński <djelinski1 at>
> wrote:
>> It is definitely valid to call CryptDecrypt multiple times with the same
>> key. Calls with Final = FALSE change the internal state of the key, calls
>> with Final = TRUE restore the initial state. Subsequent calls with Final
>> =
>> TRUE should return the same result.
>> Your testcase fails because CryptDecrypt changes the value of dwLen,
>> which
>> you do not restore before calling the function again.
> Thanks a lot of the hint, with your help I finally resolve it! I've
> improved my test and submit two rsaenh patches, would you mind help to
> review them?
> Thanks again!
> --
> Regards,
> Qian Hong
> -

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