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List:       ms-cryptoapi
Subject:    Re: CPDeriveKey
From:       Josep_Monés_Teixidor <jmt () C3PO ! ES>
Date:       2001-12-12 14:19:29
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Thanks a lot, I should have searched the archives before asking.

Regards,

Josep Monés

----- Original Message -----
From: "John Banes" <jbanes@WINDOWS.MICROSOFT.COM>
To: <CryptoAPI@DISCUSS.MICROSOFT.COM>
Sent: Monday, December 10, 2001 10:18 PM
Subject: Re: CPDeriveKey


>
http://discuss.microsoft.com/SCRIPTS/WA-MSD.EXE?A2=ind9911C&L=CryptoAPI&P=R2
50
>
> -----Original Message-----
> From: Josep Monés Teixidor [mailto:jmt@C3PO.ES]
> Sent: Monday, December 10, 2001 4:25 AM
> To: CryptoAPI@DISCUSS.MICROSOFT.COM
> Subject: CPDeriveKey
>
>
> Hi,
>
> I'm developping a CSP and i want it to be as compatible to Microsoft
Enhanced Cryptographic Provider as possible; but i found a problem: when
CPDeriveKey is called, then I use the first needed bytes from the hash as
the key material; but i don't know what should I do when deriving a
CALG_3DES key from a CALG_SHA1 or a CALG_MD5; Microsoft's provider doesn't
use a simple algorithm like concatenation, for instance... key material
doesn't look similar to hash data :-)
>
> Does anyone know which expansion algorithm does Microsoft provider use?
>
> And related to this, what should I do with DES padding bits? Should I get
the key material and then simply correct padding bits?
>
>
> TIA,
>
> Josep Monés
>
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