Microsoft KB Archive/894088

= An update is available to programmatically set the protection level of a private key when you call the CryptGenKey function in Windows XP =

Article ID: 894088

Article Last Modified on 8/29/2007

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APPLIES TO


 * Microsoft Windows XP Professional
 * Microsoft Windows XP Home Edition

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INTRODUCTION
This article describes a software update to add new functionality to Microsoft Windows XP. This new functionality lets you programmatically set the protection level of a private key when you call the CryptGenKey function.



Hotfix information
A supported hotfix is now available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next service pack that contains this hotfix.

To resolve this problem, submit a request to Microsoft Online Customer Services to obtain the hotfix. To submit an online request to obtain the hotfix, visit the following Microsoft Web site:

http://go.microsoft.com/?linkid=6294451

Note If additional issues occur or any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. To create a separate service request, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Prerequisites
You must be running Microsoft Windows XP Service Pack 2 (SP2) to install this hotfix. For more information about how to obtain the latest Windows XP service pack, click the following article number to view the article in the Microsoft Knowledge Base:

322389 How to obtain the latest Windows XP service pack

Hotfix replacement information
This hotfix does not replace any other hotfixes.

File information
The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.   Date         Time   Version        Size     File name --  03-Apr-2005  22:35  5.1.2600.2645  137,216  Dssenh.dll 03-Apr-2005 22:35  5.1.2600.2645  152,576  Rsaenh.dll

Hotfix installation information
After you install this hotfix, the CryptGenKey function is modified to accept the following new flag in the CryptGenKey function dwFlags parameter:

CRYPT_FORCE_KEY_PRTCTN

This flag indicates whether strong key protection must be used. The corresponding CPGenKey function in the Cryptographic Service Provider is also modified to process this new flag. In this situation, the scan for this new flag overrides the registry setting for strong key encryption.



MORE INFORMATION
For more information about the standard terminology that is used to describe Microsoft software updates, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates

Additional query words: Private Key, Protection Level, CryptGenKey

Keywords: kbqfe kbhotfixserver kbfix kbbug KB894088

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