The CryptDecrypt function fails when you try to decrypt encrypted content on a computer that is running Windows 7 or Windows Server 2008 R2

Symptoms

On a computer that is running Windows 7 or Windows Server 2008 R2, you run an application that uses symmetric keys in the Microsoft Base Smart Card Cryptographic Service Provider to encrypt or to decrypt content. However, the CryptDecrypt function fails when you try to decrypt encrypted content on the computer. Additionally, you receive an ERROR_INVALID_PARAMETER error code.



This issue occurs even though the CRYPT_VERIFYCONTEXT flag is used.

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

No prerequisites are required.

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 global 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 maintaining the state of the updated component. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.

For all supported x86-based versions of Windows 7

File name

File version

File size

Date

Time

Platform

Basecsp.dll

6.1.7600.20664

143,760

10-Mar-2010

09:11

x86

Scksp.dll

6.1.7600.16385

180,224

14-Jul-2009

01:16

x86

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

File name

File version

File size

Date

Time

Platform

Basecsp.dll

6.1.7600.20664

166,800

10-Mar-2010

09:18

x64

Scksp.dll

6.1.7600.16385

225,792

14-Jul-2009

01:41

x64

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

File name

File version

File size

Date

Time

Platform

Basecsp.dll

6.1.7600.20664

340,880

10-Mar-2010

08:39

IA-64

Scksp.dll

6.1.7600.16385

444,416

14-Jul-2009

01:48

IA-64

Status

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

More Information

The CRYPT_VERIFYCONTEXT flag is intended for applications that use ephemeral keys, or applications that do not require access to persisted private keys, such as applications that perform only hashing, encryption, and digital signature verification. Only applications that create signatures or decrypt by using private keys need access to the flag. In most cases, this flag should be set.

For more information about Microsoft Base Smart Card Cryptographic Service Provider, visit the following Microsoft Developer Network (MSDN) Web site:

General information about Microsoft Base Smart Card Cryptographic Service ProviderFor more information about the CRYPT_VERIFYCONTEXT flag in CryptAcquireContext function, visit the following MSDN Web site:

General information about the CRYPT_VERIFYCONTEXT flag in the CryptAcquireContext functionFor 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

Additional file information

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

Additional files for all supported x86-based versions of Windows 7

File name

X86_2bf534f25870c8592e7615232afddfa1_31bf3856ad364e35_6.1.7600.20664_none_7a2ccf9861926f1e.manifest

File version

File size

700

Date (UTC)

10-Mar-2010

Time (UTC)

17:03

Platform

Not applicable

File name

X86_microsoft-windows-smartcardksp_31bf3856ad364e35_6.1.7600.20664_none_b6650545fdbaa3cf.manifest

File version

File size

7,643

Date (UTC)

10-Mar-2010

Time (UTC)

20:13

Platform

Not applicable

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

File name

Amd64_c3facb50333d7cf27a46e54f9ff367f6_31bf3856ad364e35_6.1.7600.20664_none_ac62c8eccb9778cc.manifest

File version

File size

1,048

Date (UTC)

10-Mar-2010

Time (UTC)

17:03

Platform

Not applicable

File name

Amd64_microsoft-windows-smartcardksp_31bf3856ad364e35_6.1.7600.20664_none_1283a0c9b6181505.manifest

File version

File size

7,647

Date (UTC)

10-Mar-2010

Time (UTC)

20:24

Platform

Not applicable

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

File name

Ia64_683bdad5c4bffb4dc1c547b16d2c0c7a_31bf3856ad364e35_6.1.7600.20664_none_e212f59433373ad3.manifest

File version

File size

1,046

Date (UTC)

10-Mar-2010

Time (UTC)

17:03

Platform

Not applicable

File name

Ia64_microsoft-windows-smartcardksp_31bf3856ad364e35_6.1.7600.20664_none_b666a93bfdb8accb.manifest

File version

File size

7,645

Date (UTC)

10-Mar-2010

Time (UTC)

17:03

Platform

Not applicable

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