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Software Publisher Certificate

To comply with the kernel-mode code signing policy of 64-bit versions of Windows Vista and later versions of Windows, you can sign a kernel-mode driver by using a Software Publisher Certificate (SPC). The SPC is obtained from a third-party certificate authority (CA) that is authorized by Microsoft to issue such certificates. Signatures generated with this type of SPC also comply with the PnP driver signing requirements for 64-bit and 32-bit versions of Windows Vista and later versions of Windows.

Cross-Certificates

In addition to obtaining an SPC, you must obtain a cross-certificate that is issued by Microsoft. The cross certificate is used to verify that the CA that issued an SPC is a trusted root authority. A cross-certificate is an X.509 certificate issued by a CA that signs the public key for the root certificate of another CA. Cross-certificates allow the system to have a single trusted Microsoft root authority, but also provide the flexibility to extend the chain of trust to commercial CAs that issue SPCs.

Publishers do not have to distribute a cross-certificate with a driver package. The cross-certificate is included with the digital signature for a driver package's catalog file or the signature that is embedded in a driver file. Users who install the driver package do not have to perform any additional configuration steps caused by the use of cross-certificates.

For a list of certification authorities that provide SPCs and for more information about cross-certificates, see Microsoft Cross-Certificates for Windows Vista Kernel Mode Code Signing. Follow the instructions on the certification authority's website on how to obtain and install the SPC and corresponding cross-certificate on the computer with which you will sign a driver. In addition, you must add the SPC information to the Personal certificate store of the local computer that signs drivers. For information about this requirement, see the Installing SPC Information in the Personal Certificate Store.

Installing SPC Information in the Personal Certificate Store

In order to use an SPC to sign a driver in a manner that complies with the kernel-mode code signing policy, the certificate information must first be contained in a Personal Information Exchange (.pfx) file. The information that is contained in the .pfx file must then be added to the Personal certificate store of the local computer that signs a driver.

A CA might issue a .pfx file that contains the necessary certificate information. If so, you can add the .pfx file to the Personal certificate store by following the instructions described in Installing a .pfx File in the Personal Certificate Store.

However, a CA might issue the following pairs of files:

  • A .pvk file that contains the private key information.

  • An .spc or .cer file that contains the public key information.

In this case, the pair of files (a .pvk and an .spc, or a .pvk and a .cer) must be converted to a .pfx file in order to add the certificate information to the Personal certificate store.

To create a .pfx file from the pair of files issued by the CA, follow these instructions:

  • To convert a .pvk file and an .spc file to a .pfx file, use the following Pvk2Pfx command at a command prompt:

    
    Pvk2Pfx -pvk mypvkfile.pvk -pi mypvkpassword -spc myspcfile.spc -pfx mypfxfile.pfx -po pfxpassword -f
    
    
  • To convert a .pvk file and a .cer file, to a .pfx file, use the following Pvk2Pfx command at a command prompt:

    
    Pvk2Pfx -pvk mypvkfile.pvk -pi mypvkpassword -spc mycerfile.cer -pfx mypfxfile.pfx -po pfxpassword -f
    
    

The following describes the parameters that are used in the Pvk2Pfx command:

  • The -pvk  mypvkfile.pvk parameter specifies a .pvk file.

  • The -pi  mypvkpassword option specifies the password for the .pvk file.

  • The -spc myspcfile.spc parameter specifies an .spc file or the -spc  mycerfile.cer parameter specifies a .cer file.

  • The -pfx mypfxfile.pfx option specifies the name of a .pfx file.

  • The -po pfxpassword option specifies a password for the .pfx file.

  • The -f option configures Pvk2Pfx to replace a existing .pfx file if one exists.

Installing a .pfx File in the Personal Certificate Store

After obtaining a .pfx file from a CA, or creating a .pfx file from a .pvk and either an .spc or a .cer file, add the information in the .pfx file to the Personal certificate store of the local computer that signs the driver. You can use the Certificate Import Wizard to import the information in the .pfx file to the Personal certificate store, as follows:

  1. Locate the .pfx file in Windows Explorer and double-click the file to open the Certificate Import Wizard.

  2. Follow the procedure in the Certificate Import Wizard to import the code-signing certificate into the Personal certificate store.

 

 

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