Messages in this thread | | | Subject | Re: RFC: 'ioctl' for keyrings | From | Mimi Zohar <> | Date | Fri, 14 Mar 2014 13:53:14 -0400 |
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On Fri, 2014-03-14 at 17:14 +0000, David Howells wrote: > Mimi Zohar <zohar@linux.vnet.ibm.com> wrote: > > > > As I understand the code, I think operations being performed from ->update() > > > are: > > > > > > (a) Resealing a key with a new pcrs (trusted). > > > > > > (b) Changing the master key (encrypted). > > > > > > Mimi, Dmitry: is this list right? > > > > In addition to resealing trusted keys to a new TPM PCR value, there are > > a few other options that can be modified (eg. keyauth, blobauth, > > pcrlock). Encrypted keys can be encrypted/decrypted with a new master > > key (trusted or user key type). > > Can (re)sealing a key be viewed as encrypting it? Is the difference between > sealing a key and encrypting a key the use of hardware support?
Yes, 'resealing/sealing' is TPM terminology for encrypting/decrypting. The sealing is RSA encryption by a TPM chip, which can only be decrypted by the same chip.
Mimi
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