You experience poor performance when you call the "CryptAcquireContext" function in Windows Server 2008 R2 or in Windows 7

Not sure if this is the right fix? We've added this issue to our memory dump diagnostic which can confirm.

Symptoms

You run an application that calls the CryptAcquireContext function on a computer that is running Windows Server 2008 R2 or Windows 7. However, the CryptAcquireContext function runs 3 times slower than it runs in Windows Server 2008 or in Windows Vista.

Cause

This issue occurs because of a change in the CryptAcquireContext function in Windows Server 2008 R2 and in Windows 7.


This change checks whether the function runs in a domain environment. However, the process is time-consuming and causes the increased running time of the CryptAcquireContext function.

Resolution

Hotfix information

A supported hotfix is 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 the problem described in this article. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if 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. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=supportNote The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

Prerequisites

To apply this hotfix, you must be running Windows Server 2008 R2 or Windows 7.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

File information

The English (United States) version of this hotfix installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.

Windows 7 and Windows Server 2008 R2 file information notes


Important Windows 7 hotfixes and Windows Server 2008 R2 hotfixes are included in the same packages. However, hotfixes on the Hotfix Request page are listed under both operating systems. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows 7/Windows Server 2008 R2" on the page. Always refer to the "Applies To" section in articles to determine the actual operating system that each hotfix applies to.

  • The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows Server 2008 R2 and for Windows 7" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are extremely important to maintain the state of the updated components. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.

For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2

File name

File version

File size

Date

Time

Platform

Cng.sys

6.1.7600.16385

460,504

14-Jul-2009

01:43

x64

Ksecdd.sys

6.1.7600.20769

95,616

31-Jul-2010

05:09

x64

Ksecpkg.sys

6.1.7600.20769

152,960

31-Jul-2010

05:09

x64

Lsasrv.dll

6.1.7600.20769

1,446,912

31-Jul-2010

05:02

x64

Lsasrv.mof

Not applicable

13,780

10-Jun-2009

20:52

Not applicable

Lsass.exe

6.1.7600.16385

31,232

14-Jul-2009

01:39

x64

Secur32.dll

6.1.7600.20769

28,160

31-Jul-2010

05:05

x64

Sspicli.dll

6.1.7600.20769

136,192

31-Jul-2010

05:05

x64

Sspisrv.dll

6.1.7600.20769

28,672

31-Jul-2010

05:05

x64

Lsasrv.mof

Not applicable

13,780

22-Jul-2009

23:19

Not applicable

Secur32.dll

6.1.7600.20769

22,016

31-Jul-2010

04:31

x86

Sspicli.dll

6.1.7600.20769

96,768

31-Jul-2010

04:25

x86

For all supported IA-64-based versions of Windows Server 2008 R2

File name

File version

File size

Date

Time

Platform

Cng.sys

6.1.7600.16385

787,736

14-Jul-2009

01:52

IA-64

Ksecdd.sys

6.1.7600.20769

179,584

31-Jul-2010

04:15

IA-64

Ksecpkg.sys

6.1.7600.20769

307,072

31-Jul-2010

04:15

IA-64

Lsasrv.dll

6.1.7600.20769

2,654,720

31-Jul-2010

04:08

IA-64

Lsasrv.mof

Not applicable

13,780

10-Jun-2009

20:57

Not applicable

Lsass.exe

6.1.7600.16385

56,320

14-Jul-2009

01:44

IA-64

Secur32.dll

6.1.7600.20769

48,640

31-Jul-2010

04:10

IA-64

Sspicli.dll

6.1.7600.20769

275,456

31-Jul-2010

04:11

IA-64

Sspisrv.dll

6.1.7600.20769

45,568

31-Jul-2010

04:11

IA-64

Lsasrv.mof

Not applicable

13,780

22-Jul-2009

23:19

Not applicable

Secur32.dll

6.1.7600.20769

22,016

31-Jul-2010

04:31

x86

Sspicli.dll

6.1.7600.20769

96,768

31-Jul-2010

04:25

x86

Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

More Information

For more information about software update terminology, 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

For more information about the CryptAcquireContext function, visit the following Microsoft website:

General information about the "CryptAcquireContext" function

Additional file information

Additional file information for Windows 7 and for Windows Server 2008 R2

Additional files for all supported x64-based versions of Windows 7 and of Windows Server 2008 R2

File name

Amd64_6f1d976eb0929d0f25da119d525389f8_31bf3856ad364e35_6.1.7600.20769_none_f9c0b1e334ea0ef2.manifest

File version

Not applicable

File size

1,032

Date (UTC)

31-Jul-2010

Time (UTC)

07:35

Platform

Not applicable

File name

Amd64_d8bfb9b64cedb29d3e9c50ca385e6657_31bf3856ad364e35_6.1.7600.20769_none_60184273d547a62d.manifest

File version

Not applicable

File size

695

Date (UTC)

31-Jul-2010

Time (UTC)

07:35

Platform

Not applicable

File name

Amd64_microsoft-windows-lsa_31bf3856ad364e35_6.1.7600.20769_none_02e2bfe68f860396.manifest

File version

Not applicable

File size

103,664

Date (UTC)

31-Jul-2010

Time (UTC)

07:44

Platform

Not applicable

File name

Update.mum

File version

Not applicable

File size

2,114

Date (UTC)

31-Jul-2010

Time (UTC)

07:35

Platform

Not applicable

File name

Wow64_microsoft-windows-lsa_31bf3856ad364e35_6.1.7600.20769_none_0d376a38c3e6c591.manifest

File version

Not applicable

File size

86,382

Date (UTC)

31-Jul-2010

Time (UTC)

05:04

Platform

Not applicable

Additional files for all supported IA-64-based versions of Windows Server 2008 R2

File name

Ia64_ba543e731e6e8ea13916030d891b2ca5_31bf3856ad364e35_6.1.7600.20769_none_d53aca903d9e9942.manifest

File version

Not applicable

File size

1,030

Date (UTC)

31-Jul-2010

Time (UTC)

07:35

Platform

Not applicable

File name

Ia64_microsoft-windows-lsa_31bf3856ad364e35_6.1.7600.20769_none_a6c5c858d7269b5c.manifest

File version

Not applicable

File size

103,662

Date (UTC)

31-Jul-2010

Time (UTC)

07:35

Platform

Not applicable

File name

Update.mum

File version

Not applicable

File size

1,690

Date (UTC)

31-Jul-2010

Time (UTC)

07:35

Platform

Not applicable

File name

Wow64_microsoft-windows-lsa_31bf3856ad364e35_6.1.7600.20769_none_0d376a38c3e6c591.manifest

File version

Not applicable

File size

86,382

Date (UTC)

31-Jul-2010

Time (UTC)

05:04

Platform

Not applicable

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