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List:       ms-cryptoapi
Subject:    Direct RSA support
From:       Sanjay Beri <Sanjay.Beri () ESTAMP ! COM>
Date:       1999-06-24 18:11:10
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Thanks for your response Andrew.  However, from a previous post on this
newsgroup from Bronislav Kavsan at ire-ma.com in Jan. 1998, it was
stated that their boards/CSP do support direct RSA.  It has been a long
time since then, so I would expect that there are others now who support
this.  I just want to get a list of them (and see which is the fastest).

Also, I was wondering if someone could point me to the MS Enhanced
Provider that supports direct RSA (is it only for Windows 2000 or will
it run on NT 4.0?).  I have both NT 4.0 and Beta 3 of Windows 2000 and
yet cannot find this new dll.  Lastly, are there any special install
instructions or can I just acquire it with MS_ENHANCED_PROV (same as the
old enhanced provider).

Thanks.

Sanjay.

_____________________________________________________________________
Sanjay,

The Atalla CSP does not allow rsa encrypt/decrypt of raw data.  I don't
know of a csp that encrypt/decrypt stream of data using RSA. If it is
not for problems of licensing, you may be able to use the RSA lib BSAFE
and do what you want really easily.
-andrew

-----Original Message-----
From:   Sanjay Beri [SMTP:Sanjay.Beri@ESTAMP.COM]
<mailto:[SMTP:Sanjay.Beri@ESTAMP.COM]>
Sent:   Wednesday, June 23, 1999 2:55 PM
To:     CryptoAPI@DISCUSS.MICROSOFT.COM
<mailto:CryptoAPI@DISCUSS.MICROSOFT.COM>
Subject:

I need to use direct RSA encryption/decryption on data.
Currently, from what I understand the Microsoft Base Provider does not
allow one to encrypt directly with RSA  public keys and decrypt with RSA
private keys.  Instead, you are forced to hash the data and then allowed
to RSA encrypt it (as I understand it, you cannot avoid the first step
of hashing no matter how small your packet is).  This would be done with
CryptEncrypt and CryptDecrypt.  Encryption of symmetric keys in a
digital envelope is of course also supported.
However, I need to be able to take a stream of data and apply RSA
encryption/decryption directly on it.
        >From what I have read on MSDN, in Windows 2000, the Microsoft
Enhanced
RSA Provider is supposed to be able to support direct encryption with
RSA public keys and decryption with RSA private keys.  I currently have
Beta 3 of Windows 2000 and was wondering how I get the CSP (i.e. dll)
that supports direct RSA encryption/decryption.  My understanding is
that I would then be able to call CryptEncrypt with a NULL value for the
hash handle to perform the needed direct RSA encryption.
Furthermore, since I am looking at using a crypto board (like Atalla), I
was wondering if anyone knows which vendor's CSPs support direct RSA
encryption/decryption (for NT 4.0) as I described above.
Any help or information would be greatly appreciated.
Thanks.
Sanjay.
mailto:Sanjay.Beri@estamp.com <mailto:Sanjay.Beri@estamp.com>

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