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Subject: RE: [pkcs11] Groups - Flexible KDF Draft 1 uploaded
Hi Darren, I add some additional comments from my new PM colleague Daniel: For the Feedback Mode and Double-Pipeline Iteration Mode acc to SP800-108, additional input is needed. The Feedback Mode expects an additional IV, which has to be specified explicitly. In the Double-Pipeline Iteration Mode, the IV is defined as: Label || 0x00 || Context || [L]2. Although the input for the KDF is: A(i) {|| [i]2} || Label || 0x00 || Context || [L]2, we cannot just remove the first counter
from the CK_FKDF_DATA_PARAM (if present) to create the IV implicitly. Thus, the IV must be passed explicitly although this is cumbersome for the user since the IV needs to be concatenated manually. Therefore, an IV field needs to be added to CK_FKDF_PARAMS (which can be NULL or is ignored for some KDFs). Best regards, Dieter From: Dieter Bong
Hi Darren, that’s an interesting proposal. I have included a few minor comments and questions in the document itself, please check the track changes
and comments. The most important question for me is: When passing (a pointer to) a CK_FKDF_COUNTER_PARAM structure, is C_Derive supposed to increment that counter after using for key derivation? Or is the application supposed to increment the counter after
C_Derive has returned? Please clarify. Thanks, Dieter From:
pkcs11@lists.oasis-open.org [mailto:pkcs11@lists.oasis-open.org]
On Behalf Of Darren Johnson Submitter's message
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