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TLS Working Group                                           Joo-won Jung
INTERNET-DRAFT                                              ChangHee Lee
                                                           INITECH, Inc.
                                                            12 July 2000


                   TLS Extension for SEED and HAS-160

                      draft-ietf-tls-seedhas-00.txt

Status of this Memo

   This document is an Internet-Draft and is in full conformance with
   all provisions of Section 10 of RFC2026.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF), its areas, and its working groups.  Note that
   other groups may also distribute working documents as Internet-
   Drafts.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet- Drafts as reference
   material or to cite them other than as "work in progress."

   The list of current Internet-Drafts can be accessed at
   http://www.ietf.org/ietf/1id-abstracts.txt

   The list of Internet-Draft Shadow Directories can be accessed at
   http://www.ietf.org/shadow.html.

Introduction

   This document proposes the addition of new cipher suites to the TLS
   protocol 1.0 [TLS] to support SEED and HAS-160.

   The SEED algorithm is 128-bit symmetric block cipher algorithm.
   [SEED] The HAS-160 is 160-bit secure hash function, whose block size
   is 512 bit. [HAS] Both algorithms are developed in Korea since 1997
   for stronger communication security.  Currently, SEED is widely used
   and is the mandatory cipher in banking and stock applications in
   Korea.

HMAC of HAS-160

   HMAC of HAS160 can be defined like HMAC_MD5 or HMAC_SHA1.  Since
   HAS-160 is 512-bit block, 160-bit output secure hash algorithm, B=64
   and L=20 as the notation of [HMAC].

   The test values of HMAC_HAS160 is provided as appendix of this



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Internet-Draft     TLS Extension for SEED and HAS-160       12 July 2000


   document.

   HMAC_HAS160 is used just for MAC of record layer. Adding HMAC_HAS160
   does not affect the definitions of PRF, Finished message and other
   definitions using HMAC_MD5 or HMAC_SHA1.

Cipher Suites

   In spite of the existence of Korean digital signature algorithm,
   KCDSA, RSA algorithm is more widely used in Korea. Therefore, we
   define cipher suites with RSA key exchange.

      CipherSuite TLS_RSA_WITH_SEED_CBC_MD5          = { 0x00, 0x2C };
      CipherSuite TLS_RSA_WITH_SEED_CBC_SHA          = { 0x00, 0x2D };
      CipherSuite TLS_RSA_WITH_SEED_CBC_HAS160       = { 0x00, 0x2E };

      Note: The above numeric definitions for Cipher Suites have not yet
      been registered. The numeric definitions are the following numbers
      of CipherSuite of TLS standard.[TLS]

References

   [HAS]   TTA.IS-10118, "Hash Function Standard - Part 2 : Hash
           Function Algorithm (HAS-160)", Telecommunications Technology
           Association, Republic of Korea, November, 1998.

   [HMAC]  Krawczyk, H., Bellare, M., and R. Canetti, "HMAC:  Keyed-
           Hashing for Message Authentication," RFC 2104, February,
           1997.

   [SEED]  TTA.KO-12.0004, "128-bit Symmetric Block Cipher (SEED)",
           Telecommunications Technology Association, Republic of Korea,
           September 28, 1999.

   [TLS]   T. Dierks, and C. Allen, "The TLS Protocol Version 1.0", RFC
           2246, January 1999.


Test Values of HMAC_HAS160

   test_case =     1
   key =           0x0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b
   key_len =       20
   data =          "Hi There"
   data_len =      8
   digest =        0xf5b44115a53f716b6f488de1098ee7c251418623

   test_case =     2



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Internet-Draft     TLS Extension for SEED and HAS-160       12 July 2000


   key =           "Jefe"
   key_len =       4
   data =          "what do ya want for nothing?"
   data_len =      28
   digest =        0xa74547c1ef0aa147c7428ab7e71664549be2a412

   test_case =     3
   key =           0xaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
   key_len =       20
   data =          0xdd repeated 50 times
   data_len =      50
   digest =        0xe4c91bc71782fa44a56be1a34aae167e8ffc9734

   test_case =     4
   key =           0x0102030405060708090a0b0c0d0e0f10111213141516171819
   key_len =       25
   data =          0xcd repeated 50 times
   data_len =      50
   digest =        0x14d1055da875222053bf1180bbef8892eba3ac30

   test_case =     5
   key =           0x0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c
   key_len =       20
   data =          "Test With Truncation"
   data_len =      20
   digest =        0x63750d67af40e3fde33526545d300972a1527053

   test_case =     6
   key =           0xaa repeated 80 times
   key_len =       80
   data =          "Test Using Larger Than Block-Size Key - Hash Key First"
   data_len =      54
   digest =        0x63750d67af40e3fde33526545d300972a1527053

   test_case =     7
   key =           0xaa repeated 80 times
   key_len =       80
   data =          "Test Using Larger Than Block-Size Key and Larger
                   Than One Block-Size Data"
   data_len =      73
   digest =        0x1bdb821e399e208352c64f0655f6601e2a8a087c


      Note: These values are not cross-verified with other organization.

Author's Address

   Joo-won Jung



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Internet-Draft     TLS Extension for SEED and HAS-160       12 July 2000


   INITECH, Inc.
   EMail: jwjung@initech.com

   ChangHee Lee
   INITECH, Inc.
   EMail: chlee@initech.com

   Phone: +82 2 3430 5700











































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