[Acme] [Technical Errata Reported] RFC8555 (7565)

RFC Errata System <rfc-editor@rfc-editor.org> Thu, 13 July 2023 16:19 UTC

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Subject: [Acme] [Technical Errata Reported] RFC8555 (7565)
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The following errata report has been submitted for RFC8555,
"Automatic Certificate Management Environment (ACME)".

--------------------------------------
You may review the report below and at:
https://www.rfc-editor.org/errata/eid7565

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Type: Technical
Reported by: Paul Breed <Paul@Rasdoc.com>

Section: 8.1

Original Text
-------------
 The "Thumbprint" step indicates the computation specified in
   [RFC7638], using the SHA-256 digest [FIPS180-4].  As noted in
   [RFC7518] any prepended zero octets in the fields of a JWK object
   MUST be stripped before doing the computation.

Corrected Text
--------------
The "Thumbprint" step indicates the computation specified in
   [RFC7638], using the SHA-256 digest [FIPS180-4].  As noted in
   [RFC7518] any additional prepended zero octets in the fields of a JWK object
   MUST be stripped before doing the computation.  
   Fixed length fields such as found in ECDSA keys should be their natural length and 
   leading zero octets should not be stripped.

Notes
-----
This comment was really aimed at the leading 0 octet sometimes used with RSA, but the comment is not RSA specific. ECDSA keys can have fixed length fields (X,Y) where there can be leading zeros.  This led me astray in implementing an ECDSA thumbprint routine for ACME. The result was that 1/128 ECDSA keys failed to generate t humbp[rint as leading zeros were removed.

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--------------------------------------
RFC8555 (draft-ietf-acme-acme-18)
--------------------------------------
Title               : Automatic Certificate Management Environment (ACME)
Publication Date    : March 2019
Author(s)           : R. Barnes, J. Hoffman-Andrews, D. McCarney, J. Kasten
Category            : PROPOSED STANDARD
Source              : Automated Certificate Management Environment
Area                : Security
Stream              : IETF
Verifying Party     : IESG