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List:       ms-cryptoapi
Subject:    Re: about CPGetProvParam
From:       Laszlo Elteto <lelteto () RAINBOW ! COM>
Date:       2002-08-22 15:23:42
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PP_KEYX_KEYSIZE_INC and PP_SIG_KEYSIZE_INC tells only what INCREMENTS (in
bits) you can get key sizes. For RSA a typical value is 64 bits, but a CSP
may set it to 512 bits (eg. if it supports only 512, 1024, 1536 and 2048
bits). To get the minimum and maximum keysize for a given algorithm you have
to use PP_ENUMALGS_EX in GetProvParam. See the documentation...

Laszlo Elteto
Fellow Scientist
Rainbow Technologies, Inc.

-----Original Message-----
From: hx [mailto:hx44_88@163.COM]
Sent: Wednesday, August 21, 2002 8:34 PM
To: CryptoAPI@DISCUSS.MICROSOFT.COM
Subject: Re: about CPGetProvParam


Laszlo Elteto,Hi:
        Thank for your help?i find the error is not only PP_KEYSPEC ,but
also in the  PP_KEYX_KEYSIZE_INC,i set it as 1024 bits.but we only support
the key length is 1024 bit.(our CSP's type is PROV_RSA_FULL)so i change it
as 512 bits ,it is success.my question is :does the minimum key length rest
with the CSP type?and we only support the 1024 bits.if this,will we support
the 512 bits and 1024bits?if we only support the 1024 bits,how can i do?

======= 2002-08-20 09:07:00 ÄúÔÚÀ´ÐÅÖÐдµÀ£º=======

>PP_KEYSPEC tells what keypairs your CSP supports. Your CSP should return a
>DWORD with the value of AT_KEYEXCHANGE + AT_SIGNATURE if both keypair types
>you support. (SChannel providers typically return only AT_KEYEXCHANGE).
>
>Laszlo Elteto
>Fellow Scientist
>Rainbow Technologies, Inc.
>
>-----Original Message-----
>From: Xing Hua [mailto:hx44_88@163.COM]
>Sent: Tuesday, August 20, 2002 3:18 AM
>To: CryptoAPI@DISCUSS.MICROSOFT.COM
>Subject: about CPGetProvParam
>
>
>when i login the test security web site of microsoft,i will download a
>certificate.the wrong is occured.i found the wrong is in call
>CPGetProvParam function.the paramter is PP_KEYSPEC .what is this paramter?
>how can i process it?
>
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¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡hx
¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡hx44_88@163.com
¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡2002-08-22

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