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Signed driver can be loaded in winodws 8, but can't in windows 7. RRS feed

  • Question

  • Hi all!

    I had developed a kernel driver, and signed with a certificate bought from a branch seller. The signed driver can work in windows 8. But can't work in windows 7. Both windows 7 and 8 are all x64 version. I contact the seller. They tell me the procedure signing and the certificate are all correct. They can't help me any more, and give me an advise to find help from microsoft. Is there any one be kind to tell me where I can find help? Or an email address of Technology support of Microsoft is preferred too.

    Thank you!

    Best regards!

    Saturday, February 28, 2015 7:06 AM

Answers

  • Win7 still does not support SHA-265 certificates (to make the long story short...)  so all you can do is persuade the seller to give you a compatible cert, or go to another seller.

    -- pa

    Saturday, February 28, 2015 7:58 AM
  • You need an SHA-1 certificate for Win7, and Pavel stated SHA-256 certs work on Win8 but not Win7.


    Don Burn Windows Filesystem and Driver Consulting Website: http://www.windrvr.com

    Saturday, February 28, 2015 11:59 AM

All replies

  • Be glad to see your reply. Please tell me what kind of certificate is supported by win7?

    Thank you!

    Saturday, February 28, 2015 9:03 AM
  • You need an SHA-1 certificate for Win7, and Pavel stated SHA-256 certs work on Win8 but not Win7.


    Don Burn Windows Filesystem and Driver Consulting Website: http://www.windrvr.com

    Saturday, February 28, 2015 11:59 AM
  • So is the double signing the final solution for Win7 compatibility? (signing with two certificates - sha-1 and sha-256, on Win8.1 or Win10 machine)?

    Don't two certificates, by themselves,  cause problems on win7, like did the revoked update for win7 (KB2949927) ?

    -- pa

    Sorry, I can't your meaning. A article from Microsoft tells me that the newer signing will overwrite the old one.
    Monday, March 9, 2015 7:48 AM
  • AFAIK, you can use the cert for Win7 on Win8.


    Don Burn Windows Filesystem and Driver Consulting Website: http://www.windrvr.com

    Monday, March 9, 2015 10:33 AM