[AVTCORE] [Technical Errata Reported] RFC3711 (3712)

RFC Errata System <rfc-editor@rfc-editor.org> Tue, 27 August 2013 11:19 UTC

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Subject: [AVTCORE] [Technical Errata Reported] RFC3711 (3712)
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The following errata report has been submitted for RFC3711,
"The Secure Real-time Transport Protocol (SRTP)".

--------------------------------------
You may review the report below and at:
http://www.rfc-editor.org/errata_search.php?rfc=3711&eid=3712

--------------------------------------
Type: Technical
Reported by: Christian S Oien <coien@cisco.com>

Section: 4.3.2

Original Text
-------------
Replace the SRTP index by the 32-bit quantity: 0 || SRTCP index
(i.e., excluding the E-bit, replacing it with a fixed 0-bit), and use


Corrected Text
--------------
Replace the SRTP index by the 48-bit quantity: 0 || SRTCP index
(i.e., excluding the E-bit, replacing it with a fixed 0-bit and then
prepending a 16-bits zero padding), and use


Notes
-----
Replacing with a 32-bit quantity means that the DIV operator will
yield a 32-bit quantity.  Following the specification of key_id for SRTCP
the <label> will have 32 bits to its right when XOR'ing with master_salt.

The majority of implementations, including libsrtp, invokes this XOR with the
<label> at the same position as for SRTP.  According to the specification
this should be done 16 bits to the right of this, when invoking for SRTCP.

Instructions:
-------------
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--------------------------------------
RFC3711 (draft-ietf-avt-srtp-09)
--------------------------------------
Title               : The Secure Real-time Transport Protocol (SRTP)
Publication Date    : March 2004
Author(s)           : M. Baugher, D. McGrew, M. Naslund, E. Carrara, K. Norrman
Category            : PROPOSED STANDARD
Source              : Audio/Video Transport
Area                : Real-time Applications and Infrastructure
Stream              : IETF
Verifying Party     : IESG