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After completing test signing and verifying that the driver is ready for release, the driver package has to be release signed. There are two ways of release signing a driver package.
Release-signing identifies the publisher of a kernel-mode or user-mode binaries (for example, .sys or .dll files) that loads into Windows Vista and later versions of Windows.
Kernel-mode binaries are release-signed through either:
- Windows Hardware Quality Lab (WHQL also known as Winqual) to release sign a driver package. A WHQL Release Signature is obtained through the Windows Certification Program. The link below describes the five steps from start to finish on Windows Certification Program. See Windows hardware certification: start here for more details about this option. Any questions on the steps in the link above should be directed to sysdev@microsft.com alias.
- Instead of using the WHQL program, a driver package can be release signed by driver developers and vendors. This program has started from the Vista OS release. A release signature is created through 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
The steps needed to release sign a driver package for method 2 are described next.
Obtain a Software Publisher Certificate (SPC)
Release signing requires a code-signing certificate, also referred to as a Software Publisher Certificate (SPC) from a commercial CA.
The Cross-Certificates for Kernel Mode Code Signing topic provides the list of commercial third-party certificate authorities (CA) authorized by Microsoft. The CA vendors listed must be used to provide a Software Publisher Certificate (SPC) to release sign the driver package.
Follow the CA's instructions for how to acquire the SPC and install the private key on the signing computer. Please note that the SPC is a proprietary instrument of the driver vendor who requested it for signing their driver package. The SPC, the private key, and the password must not be shared with anyone outside the requesting vendor’s organization.
Cross-Certificates
Excerpt fromSoftware Publisher Certificate:
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.
Selected excerpts fromCross-Certificates for Kernel Mode Code Signing:
A cross-certificate is a digital certificate issued by one Certificate Authority (CA) that is used to sign the public key for the root certificate of another Certificate Authority. Cross-certificates provide a means to create a chain of trust from a single, trusted, root CA to multiple other CAs.
In Windows, cross-certificates:
- Allow the operating system kernel to have a single trusted Microsoft root authority.
- Extend the chain of trust to multiple commercial CAs that issue Software Publisher Certificates (SPCs), which are used for code-signing software for distribution, installation, and loading on Windows
The cross-certificates that are provided here are used with the Windows Driver Kit (WDK) code-signing tools for properly signing kernel-mode software. Digitally signing kernel-mode software is similar to code-signing any software that is published for Windows. Cross-certificates are added to the digital signature by the developer or software publisher when signing the kernel-mode software. The cross-certificate itself is added by the code-signing tools to the digital signature of the binary file or catalog.
Selecting the Correct Cross-certificate
Microsoft provides a specific cross-certificate for each CA that issues SPCs for code-signing kernel-mode code. For more information about cross-certificates, see Cross-Certificates for Kernel Mode Code Signing. This topic lists the names of the Microsoft authorized CA vendors and the correct cross-certificate for the root authority that issued your SPC. Locate the correct cross-certificate for the SPC issued by your CA vendor and download the cross-certificate to the signing computer you will be using for release signing, and store it in your driver directory. It is advisable to provide the absolute path to this Certificate when using it in any signing command.
Installing SPC Information in the Personal Certificate Store
Further excerpts fromSoftware Publisher Certificate:
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:
To convert a .pvk file and a .cer file, to a .pfx file, use the following Pvk2Pfx command at a command prompt:
The following describes the parameters that are used in the Pvk2Pfx command:
The -pvkmypvkfile.pvk parameter specifies a .pvk file.
The -pimypvkpassword option specifies the password for the .pvk file.
The -spcmyspcfile.spc parameter specifies an .spc file or the -spcmycerfile.cer parameter specifies a .cer file.
The -pfxmypfxfile.pfx option specifies the name of a .pfx file.
The -popfxpassword option specifies a password for the .pfx file.
The -f option configures Pvk2Pfx to replace a existing .pfx file if one exists.
[!IMPORTANY]You should protect your pvk and pfx files with strong passwords.
Installing a .pfx File in the Personal Certificate Store
For signing kernel-mode drivers, the certificates and key stored in the .pfx file must be imported into the local Personal certificate store. Signtool does not support using .pfx files for signing kernel-mode drivers. The restriction is due to a conflict in adding cross-certificates in the signature while using a certificate from a .pfx file
Final excerpts fromSoftware Publisher Certificate:
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:
Locate the .pfx file in Windows Explorer and double-click the file to open the Certificate Import Wizard.
Follow the procedure in the Certificate Import Wizard to import the code-signing certificate into the Personal certificate store.
Excerpt fromImporting an SPC into a Certificate Store:
Starting with Windows Vista, an alternative way to import the .pfx file into the local Personal certificate store is with the CertUtil command-line utility. The following command-line example uses CertUtil to import the abc.pfx file into the Personal certificate store:
Where:
The -user option specifies 'Current User' Personal store.
The -p option specifies the password for the .pfx file (pfxpassword).
The -importPFX option specifies name of the .pfx file (abc.pfx).
View SPC Properties
Use the MMC Certificates snap-in (certmgr.msc) to view the certificates in the Personal certificate store.
- Launch the Certificates snap-in, certmgr.msc.
- In the snap-in's left pane, select the Personal certificate store folder.
- Click the Certificates folder and double-click the certificate that is to be used for release signing.
- On the Details tab of the Certificate dialog box, select Subject from the list of fields to highlight the certificate's subject name. This is the name that is used with Signtool's /n argument in the examples in this section.
Signing
Based onRelease-Signing a Driver Package's Catalog File:
Run the following commands to sign the cat file which signs the driver package. The /n command should use the quoted name of the certificate which you will see under Subject in step 4 above, as CN= MyCompany Inc.
/ac FileName
Specifies a file that contains an additional certificate to add to the signature block. This is the cross signing certificate, MSCV-VSClass3.cer, obtained from Microsoft cross certificate download link. Use a full path name if the cross-certificate is not in the current directory. Though not required, it is advisable to add cross certificate while signing the cat file.
/s StoreName
Specifies the store to open when searching for the certificate. If this option is not specified, the My store is opened, which is the Personal certificate Store.
/n SubjectName
Specifies the name of the subject of the signing certificate. This value can be a substring of the entire subject name.
/t URL
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Specifies the URL of the time stamp server. If this option is not present, then the signed file will not be time stamped. With time stamping, the signed driver package remains valid indefinitely until the SPC signing certificate gets revoked for other reasons.
You must follow every signing steps correctly as described above, otherwise you will not be able to sign the driver. You may get errors shown below.
Embed Signing
Based onRelease-Signing a Driver through an Embedded Signature:
Starting with Windows Vista, the kernel-mode code signing policy controls whether a kernel-mode driver will be loaded. 64-bit versions of Windows starting with Windows Vista has stricter requirement compared to 32-bit versions of Windows.
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A kernel-mode boot-start driver must have an embedded Software Publisher Certificate (SPC) signature. This applies to any type of PnP or non-PnP kernel-mode boot-start driver. Also applies to the 32-bit versions of Windows. A PnP kernel-mode driver that is not a boot-start driver must have either an embedded SPC signature, a catalog file with a WHQL release signature, or a catalog file with an SPC signature.
Please refer to Kernel-Mode Code Signing Requirements for additional information.
Command for embed signing the toaster.sys file.
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After signing is completed, run the command below to verify the signed driver.
Command output:
Note the presence of Microsoft Code Verification Root in the certificate chain.
Next, check embed signing of the toaster.sys file.
Command output:
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Again, note the presence of Microsoft Code Verification Root in the certificate chain.