The SEED Cipher Algorithm and Its Use with the Secure Real-Time Transport Protocol (SRTP)
RFC 5669

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Internet Engineering Task Force (IETF)                           S. Yoon
Request for Comments: 5669                                        J. Kim
Category: Standards Track                                        H. Park
ISSN: 2070-1721                                                 H. Jeong
                                                                  Y. Won
                                        Korea Internet & Security Agency
                                                             August 2010

                 The SEED Cipher Algorithm and Its Use
          with the Secure Real-Time Transport Protocol (SRTP)

Abstract

   This document describes the use of the SEED block cipher algorithm in
   the Secure Real-time Transport Protocol (SRTP) for providing
   confidentiality for Real-time Transport Protocol (RTP) traffic and
   for the control traffic for RTP, the Real-time Transport Control
   Protocol (RTCP).

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc5669.

Copyright Notice

   Copyright (c) 2010 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
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   described in the Simplified BSD License.

Yoon, et al.                 Standards Track                    [Page 1]
RFC 5669                        SEED-SRTP                    August 2010

   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
   10, 2008.  The person(s) controlling the copyright in some of this
   material may not have granted the IETF Trust the right to allow
   modifications of such material outside the IETF Standards Process.
   Without obtaining an adequate license from the person(s) controlling
   the copyright in such materials, this document may not be modified
   outside the IETF Standards Process, and derivative works of it may
   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   than English.

Table of Contents

   1. Introduction ....................................................3
      1.1. SEED .......................................................3
      1.2. Terminology ................................................3
      1.3. Definitions ................................................3
   2. Cryptographic Transforms ........................................4
      2.1. Counter ....................................................4
           2.1.1. Message Authentication/Integrity: HMAC-SHA1 .........4
      2.2. Counter with CBC-MAC (CCM) .................................4
      2.3. Galois/Counter Mode (GCM) ..................................6
   3. Nonce Format for CCM and GCM ....................................6
      3.1. Nonce for SRTP .............................................6
      3.2. Nonce for SRTCP ............................................6
   4. Key Derivation: SEED-CTR PRF ....................................7
   5. Mandatory-to-Implement Transforms ...............................7
   6. Security Considerations .........................................7
   7. IANA Considerations .............................................8
   8. Acknowledgements ................................................8
   9. References ......................................................8
      9.1. Normative References .......................................8
      9.2. Informative References .....................................9
   Appendix A. Test Vectors ..........................................10
      A.1. SEED-CTR Test Vectors .....................................10
      A.2. SEED-CCM Test Vectors .....................................11
      A.3. SEED-GCM Test Vectors .....................................12

Yoon, et al.                 Standards Track                    [Page 2]
RFC 5669                        SEED-SRTP                    August 2010