Hello Herbert, > On Mon, Oct 07, 2013 at 05:48:26PM +0200, Marek Vasut wrote: > > Hello Christoph, > > > > > Hello Marek, > > > > > > > Marek Vasut <marex@xxxxxxx> hat am 28. September 2013 um 05:35 > > > > geschrieben: [...] > > > > > > > > > > 3) What are those ugly new IOCTLs in the dcp.c driver? > > > > > > > > > > When I firstly posted the driver in the mailinglist, there where > > > > > one person who actually used this interface (it was introduced in > > > > > Freescale's SDK) to use the OTP keys for crypto. As far as I have > > > > > seen, the crypto API does not support such keys (i.e. there seems > > > > > to be no way to tell a driver to use some kind of special keys - > > > > > which are not delivered by the user - via the API). > > > > > Therefore I added this miscdevice and adopted Freescale's > > > > > interface. > > > > > > > > The keys are programmed into the OTP registers, correct? There is > > > > OCOTP d > > > > > > > >river > > > >for the MX23/MX28 OTP hardware. This is what should have been used > > > >then. > > > > > > > > NOTE: This IOCTL interface seems like quite an abusive way to allow > > > > userl > > > > > > > >and to > > > >access the crypto API in kernel. I understand this is used by some > > > >Freesc ale tool, but won't it be better to fix the Freescale tool > > > >instead ? > > > > > > the IOCTL interface is used to AES encrypt a bootstream with the AES > > > key in OCOTP. > > > The idea is that only the DCP can read/access the key once it has been > > > programmed > > > into the OCOTP. If the crypto API has means to tell the DCP to use the > > > key from OCOTP, the tool from Freescale is a minor problem. > > > > Ah right. I suspect the crypto API services shall not be exported into > > userland at all, yes ? So there has to be some kind of workaround here > > for this freescale tool, which is rather unfortunate. > > These ioctls have to go. I should have never let them through in > the first place. Can someone cook up a patch to kill them please? I can do that. I wonder if we can't agree to nuke the in-tree driver altogether instead and replace it by this one though. Does it not sound more reasonable? Best regards, Marek Vasut -- To unsubscribe from this list: send the line "unsubscribe linux-crypto" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
