(Adding the JOSE working group)
I believe you're right. I'll plan to make this change in the next version of
the spec.
Thanks for the careful read!
-- Mike
From: Shaun Cooley (shcooley) [mailto:[email protected]]
Sent: Friday, June 13, 2014 10:34 AM
To: Mike Jones
Cc: Matt Miller (mamille2)
Subject: draft-ietf-jose-json-web-algorithms-27: section-5.2 (PKCS #5)
Michael -
I am working on implementing a browser compatible JS implementation of JOSE,
based on the work Matt Miller did for Node.JS. While going through the spec, I
noticed that PKCS #5 is called out for the AES-CBC ciphers. Shouldn't this be
PKCS #7?
PKCS #5 - RFC2898 section 6.2 specifies:
The padding string PS shall consist of 8 - (||M|| mod 8) octets all having
value 8 - (||M|| mod 8).
PKCS #7 - RFC2315 section 10.3 note 2 specifies:
For such algorithms, the method shall be to pad the input at the trailing end
with k - (l mod k) octets all having value k - (l mod k), where l is the length
of the input.
PKCS #7 allows for padding in block sizes of 2-255 bytes, whereas PKCS #5 is
intended for block sizes of 8. This means that PKCS #7 is a superset of #5,
and given that AES is a block size of 16, it seems the spec should require PKCS
#7.
Thoughts?
Shaun Cooley
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