Hi,
Sadly, adding this parameter doesn't change the problem. Do you happen to
have any other suggestions ? While I'm familiar with the concepts of
Trusted Computing, UEFI programmation is still quite new to me...
Thanks,
Eric Viseur
Etudiant Ingénieur Civil Electricien
LinkedIn Profile<http://www.linkedin.com/profile/view?id=193442069&trk=tab_pro>
2014-03-17 4:44 GMT+01:00 Long, Qin <qin.l...@intel.com>:
> Hi, Eric,
>
>
>
> For HashLogExtendEvent() function, you need to provide the
> EventLogLastEntry parameter even if you don't care about this. The function
> will check if this is NULL. (*EventNumber could be NULL here.)
>
>
>
> Please try:
>
> ......
>
> EFI_PHYSICAL_ADDRESS LastEntry;
>
> ......
>
> HashLogExtendEvent(&tcg, (UINT8*)&image_content, len, sha1, &tcgLogData,
> NULL, &LastEntry);
>
>
>
>
>
> Best Regards & Thanks,
>
> LONG, Qin
>
>
>
> *From:* Eric Viseur [mailto:eric.vis...@gmail.com]
> *Sent:* Friday, March 14, 2014 5:02 PM
>
> *To:* edk2-devel@lists.sourceforge.net
> *Subject:* Re: [edk2] Using the TCG protocol
>
>
>
> I'm stuck one more. No error this time, the HashLogExtendEvent function
> just fails with my EFI Shell becoming unresponsive. Following your advice
> of using it to also do the hash, I tried the following :
>
> TCG_ALGORITHM_ID sha1 = 4;
> UINT64 hashed_len;
> UINT8 *hashed_content = NULL;
>
> // Prepare the PCR event to be used when storing the hash
> TCG_PCR_EVENT tcgLogData;
> tcgLogData.PCRIndex = 8;
>
> // Extend the hashed value into PCR8
> HashLogExtendEvent(&tcg, (UINT8*)&image_content, len, sha1, &tcgLogData,
> NULL, NULL);
>
> Also tried to set the EventType value in tcgLogData, or even omit
> &image_content and len by putting the value returned by HashAll into
> tcgLogData.Digest to no avail (Last one didn't even build, even with
> typecasting).
>
> I'm quite sure I'm missing something obvious here...
>
> Regards,
>
>
> Eric Viseur
>
> Etudiant Ingénieur Civil Electricien
>
> LinkedIn
> Profile<http://www.linkedin.com/profile/view?id=193442069&trk=tab_pro>
>
>
>
> 2014-03-14 9:25 GMT+01:00 Eric Viseur <eric.vis...@gmail.com>:
>
> Seems like it's working now ! hashed_len indeed changes its value (to 20)
> and I get content into the buffer. I'll do further checking and come back
> to you should I meet another TCG-related problem.
>
> Thank you for your insights !
>
> Regards,
>
>
> Eric Viseur
>
> Etudiant Ingénieur Civil Electricien
>
> LinkedIn
> Profile<http://www.linkedin.com/profile/view?id=193442069&trk=tab_pro>
>
>
>
> 2014-03-14 8:53 GMT+01:00 Long, Qin <qin.l...@intel.com>:
>
>
>
> Please make sure you are using the correct parameters of HashAll(), e.g.
>
> HashAll (&tcg, (UINT8 *)&hashIn, hashInLen, sha1, &hashed_len,
> &hashed_content);
>
>
>
> For EFI_SUCCESS return value, I guess we may didn't catch the failed
> result of internal memory allocation. Need double-check on this.
>
>
>
>
>
> Best Regards & Thanks,
>
> LONG, Qin
>
>
>
> *From:* Eric Viseur [mailto:eric.vis...@gmail.com]
> *Sent:* Friday, March 14, 2014 3:20 PM
> *To:* edk2-devel@lists.sourceforge.net
> *Subject:* Re: [edk2] Using the TCG protocol
>
>
>
> The function returns EFI_SUCCESS (0), which is very strange. I call it
> with the following code (if I try using a constant integer instead of the
> file) :
>
> TCG_ALGORITHM_ID sha1 = 4;
> UINT64 hashed_len = 128; (Tried with various values)
> UINT8 *hashed_content = NULL;
> UINT8 hashIn = 1234;
> UINT64 hashInLen = 4;
>
> HashAll(&tcg, hashIn, hashInLen, sha1, hashed_len, &hashed_content);
>
> My output buffer remains desperately empty. I'm okay with using only
> SHA-1 as it's only one of the many pieces of the project, as long as I get
> it working.
>
> I wanted to try this one before switching to HashLogExtendEvent because
> I'm having some trouble with the function description given in the TCG EFI
> specifications, but I can change my course of action if needed.
>
> Regards,
>
>
> Eric Viseur
>
> Etudiant Ingénieur Civil Electricien
>
> LinkedIn
> Profile<http://www.linkedin.com/profile/view?id=193442069&trk=tab_pro>
>
>
>
> 2014-03-14 1:57 GMT+01:00 Dong, Guo <guo.d...@intel.com>:
>
>
>
> Viseur,
>
>
>
> What's the return status for EFI_TCG_PROTOCOL.HashAll()?
>
> And for this protocol, only the SHA1 algorithm is supported.
>
>
>
> BTW, EFI_TCG_PROTOCOL.HashAll() only gets the hashed data, and if you want
> to extend it to TPM PCR and log the event, you can simple use
> EFI_TCG_PROTOCOL.HashLogExtendEvent() function.
>
>
>
> Thanks,
>
> Guo
>
> *From:* Eric Viseur [mailto:eric.vis...@gmail.com]
> *Sent:* Friday, March 14, 2014 12:29 AM
> *To:* edk2-devel@lists.sourceforge.net
> *Subject:* [edk2] Using the TCG protocol
>
>
>
> Hi all,
>
> I'm currently working on a Linux project involving the use of the TPM.
> The idea is to somehow reproduce the TPM part of TrustedGrub on UEFI,
> except it's only to boot a fixed kernel. For various reasons it is done
> using gnu-efi rather than EDKII. However, I think my question is generic
> enough for this mailing-list.
>
> So, my current idea is to create a small EFI application that will do the
> needed processing, and then load the linux kernel through EFI Stub. I got
> the "processing then stub" part right, everything works, except for the PCR
> extending.
>
> What I'm currently doing is loading the kernel.efi file contents into a
> buffer using the Open and Read methods of the EFI_FILE_HANDLE handle. My
> aim was then to send the content of this buffer as an input to the
> EFI.TCG_PROTOCOL.HashALL() function, but I always end up with an empty
> output buffer, even if I simply send a fixed integer instead of the file
> contents as an input buffer.
>
> Is there anyone here that has already used this protocol and can help me,
> or even redirect me to a more appropriate source of information ?
>
> Thanks in advance !
>
> Regards,
>
>
> Eric Viseur
>
> Etudiant Ingénieur Civil Electricien
>
> LinkedIn
> Profile<http://www.linkedin.com/profile/view?id=193442069&trk=tab_pro>
>
>
>
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