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Bug 2114772 - [FIPS lab review] HKDF limitations
Summary: [FIPS lab review] HKDF limitations
Alias: None
Product: Red Hat Enterprise Linux 9
Classification: Red Hat
Component: openssl
Version: 9.1
Hardware: Unspecified
OS: Unspecified
Target Milestone: rc
: ---
Assignee: Clemens Lang
QA Contact: Hubert Kario
Depends On:
Blocks: 2118388
TreeView+ depends on / blocked
Reported: 2022-08-03 08:57 UTC by Dmitry Belyavskiy
Modified: 2023-06-05 15:55 UTC (History)
3 users (show)

Fixed In Version: openssl-3.0.1-41.el9_0
Doc Type: No Doc Update
Doc Text:
Clone Of:
: 2118388 (view as bug list)
Last Closed: 2023-06-05 15:55:26 UTC
Type: Bug
Target Upstream Version:

Attachments (Terms of Use)

System ID Private Priority Status Summary Last Updated
Red Hat Issue Tracker CRYPTO-8058 0 None None None 2022-08-08 13:36:10 UTC
Red Hat Issue Tracker RHELPLAN-129996 0 None None None 2022-08-03 09:04:31 UTC

Description Dmitry Belyavskiy 2022-08-03 08:57:56 UTC
HKDF algorithms are only allowed in the context of TLS 1.3. 

HKDF is only approved when it is used as specified in SP800-56C. This spec
defines that HKDF is only allowed to process shared secrets that were agreed
on (DH) or exchanged (RSA). This means it is allowed to be used as part of TLS

NIST made it very clear that HKDF is not allowed to be used as a general-
purpose KDF like SP800-108 KDFs. 

If HKDF is not merged with the key establishment method by the module, then it
is non-approved considering that 56C defines a schema that must be provided by
the module and not by the caller.

We can document that the HKDF indicator is applicable only for TLS applications. For any other use the function is unapproved and the indicator does not apply.

Comment 9 Clemens Lang 2023-06-05 15:55:26 UTC
RHEL 9.1 contains openssl-3.0.1-43.el9_0.

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