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Network Working Group                                          C. Madson
Request for Comments: 2404                            Cisco Systems Inc.
Category: Standards Track                                       R. Glenn
                                                           November 1998

               The Use of HMAC-SHA-1-96 within ESP and AH

Status of this Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (1998).  All Rights Reserved.


   This memo describes the use of the HMAC algorithm [RFC-2104] in
   conjunction with the SHA-1 algorithm [FIPS-180-1] as an
   authentication mechanism within the revised IPSEC Encapsulating
   Security Payload [ESP] and the revised IPSEC Authentication Header
   [AH]. HMAC with SHA-1 provides data origin authentication and
   integrity protection.

   Further information on the other components necessary for ESP and AH
   implementations is provided by [Thayer97a].

1.  Introduction

   This memo specifies the use of SHA-1 [FIPS-180-1] combined with HMAC
   [RFC-2104] as a keyed authentication mechanism within the context of
   the Encapsulating Security Payload and the Authentication Header.
   The goal of HMAC-SHA-1-96 is to ensure that the packet is authentic
   and cannot be modified in transit.

   HMAC is a secret key authentication algorithm. Data integrity and
   data origin authentication as provided by HMAC are dependent upon the
   scope of the distribution of the secret key. If only the source and
   destination know the HMAC key, this provides both data origin

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RFC 2404       The Use of HMAC-SHA-1-96 within ESP and AH  November 1998

   authentication and data integrity for packets sent between the two
   parties; if the HMAC is correct, this proves that it must have been
   added by the source.

   In this memo, HMAC-SHA-1-96 is used within the context of ESP and AH.
   For further information on how the various pieces of ESP - including
   the confidentiality mechanism -- fit together to provide security
   services, refer to [ESP] and [Thayer97a]. For further information on
   AH, refer to [AH] and [Thayer97a].

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   document are to be interpreted as described in [RFC 2119].

2. Algorithm and Mode

   [FIPS-180-1] describes the underlying SHA-1 algorithm, while [RFC-
   2104] describes the HMAC algorithm. The HMAC algorithm provides a
   framework for inserting various hashing algorithms such as SHA-1.

   HMAC-SHA-1-96 operates on 64-byte blocks of data.  Padding
   requirements are specified in [FIPS-180-1] and are part of the SHA-1
   algorithm.  If you build SHA-1 according to [FIPS-180-1] you do not
   need to add any additional padding as far as HMAC-SHA-1-96 is
   concerned.  With regard to "implicit packet padding" as defined in
   [AH] no implicit packet padding is required.

   HMAC-SHA-1-96 produces a 160-bit authenticator value.  This 160-bit
   value can be truncated as described in RFC2104.  For use with either
   ESP or AH, a truncated value using the first 96 bits MUST be
   supported.  Upon sending, the truncated value is stored within the
   authenticator field.  Upon receipt, the entire 160-bit value is
   computed and the first 96 bits are compared to the value stored in
   the authenticator field.  No other authenticator value lengths are
   supported by HMAC-SHA-1-96.

   The length of 96 bits was selected because it is the default
   authenticator length as specified in [AH] and meets the security
   requirements described in [RFC-2104].

2.1  Performance

   [Bellare96a] states that "(HMAC) performance is essentially that of
   the underlying hash function".  As of this writing no detailed
   performance analysis has been done of SHA-1, HMAC or HMAC combined
   with SHA-1.

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RFC 2404       The Use of HMAC-SHA-1-96 within ESP and AH  November 1998

   [RFC-2104] outlines an implementation modification which can improve
   per-packet performance without affecting interoperability.

3. Keying Material

   HMAC-SHA-1-96 is a secret key algorithm. While no fixed key length is
   specified in [RFC-2104], for use with either ESP or AH a fixed key
   length of 160-bits MUST be supported.  Key lengths other than 160-
   bits MUST NOT be supported (i.e. only 160-bit keys are to be used by
   HMAC-SHA-1-96).  A key length of 160-bits was chosen based on the
   recommendations in [RFC-2104] (i.e. key lengths less than the
   authenticator length decrease security strength and keys longer than
   the authenticator length do not significantly increase security

   [RFC-2104] discusses requirements for key material, which includes a
   discussion on requirements for strong randomness.  A strong pseudo-
   random function MUST be used to generate the required 160-bit key.

   At the time of this writing there are no specified weak keys for use
   with HMAC.  This does not mean to imply that weak keys do not exist.
   If, at some point, a set of weak keys for HMAC are identified, the
   use of these weak keys must be rejected followed by a request for
   replacement keys or a newly negotiated Security Association.

   [ARCH] describes the general mechanism for obtaining keying material
   when multiple keys are required for a single SA (e.g. when an ESP SA
   requires a key for confidentiality and a key for authentication).

   In order to provide data origin authentication, the key distribution
   mechanism must ensure that unique keys are allocated and that they
   are distributed only to the parties participating in the

   [RFC-2104] makes the following recommendation with regard to
   rekeying.  Current attacks do not indicate a specific recommended
   frequency for key changes as these attacks are practically
   infeasible.  However, periodic key refreshment is a fundamental
   security practice that helps against potential weaknesses of the
   function and keys, reduces the information avaliable to a
   cryptanalyst, and limits the damage of an exposed key.

4.  Interaction with the ESP Cipher Mechanism

   As of this writing, there are no known issues which preclude the use
   of the HMAC-SHA-1-96 algorithm with any specific cipher algorithm.

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RFC 2404       The Use of HMAC-SHA-1-96 within ESP and AH  November 1998

5.  Security Considerations

   The security provided by HMAC-SHA-1-96 is based upon the strength of
   HMAC, and to a lesser degree, the strength of SHA-1.  At the time of
   this writing there are no practical cryptographic attacks against

   [RFC-2104] states that for "minimally reasonable hash functions" the
   "birthday attack" is impractical.  For a 64-byte block hash such as
   HMAC-SHA-1-96, an attack involving the successful processing of 2**80
   blocks would be infeasible unless it were discovered that the
   underlying hash had collisions after processing 2**30 blocks.  A hash
   with such weak collision-resistance characteristics would generally
   be considered to be unusable.

   It is also important to consider that while SHA-1 was never developed
   to be used as a keyed hash algorithm, HMAC had that criteria from the

   [RFC-2104] also discusses the potential additional security which is
   provided by the truncation of the resulting hash. Specifications
   which include HMAC are strongly encouraged to perform this hash

   As [RFC-2104] provides a framework for incorporating various hash
   algorithms with HMAC, it is possible to replace SHA-1 with other
   algorithms such as MD5. [RFC-2104] contains a detailed discussion on
   the strengths and weaknesses of HMAC algorithms.

   As is true with any cryptographic algorithm, part of its strength
   lies in the correctness of the algorithm implementation, the security
   of the key management mechanism and its implementation, the strength
   of the associated secret key, and upon the correctness of the
   implementation in all of the participating systems.  [RFC-2202]
   contains test vectors and example code to assist in verifying the
   correctness of HMAC-SHA-1-96 code.

6.  Acknowledgments

   This document is derived in part from previous works by Jim Hughes,
   those people that worked with Jim on the combined DES/CBC+HMAC-MD5
   ESP transforms, the ANX bakeoff participants, and the members of the
   IPsec working group.

   We would also like to thank Hugo Krawczyk for his comments and
   recommendations regarding some of the cryptographic specific text in
   this document.

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RFC 2404       The Use of HMAC-SHA-1-96 within ESP and AH  November 1998

7.  References

   [FIPS-180-1] NIST, FIPS PUB 180-1: Secure Hash Standard,
                April 1995.
                http://csrc.nist.gov/fips/fip180-1.txt (ascii)
                http://csrc.nist.gov/fips/fip180-1.ps  (postscript)

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

   [Bellare96a] Bellare, M., Canetti, R., and H. Krawczyk, "Keying Hash
                Functions for Message Authentication", Advances in
                Cryptography, Crypto96 Proceeding, June 1996.

   [ARCH]       Kent, S., and R. Atkinson, "Security Architecture for
                the Internet Protocol", RFC 2401, November 1998.

   [ESP]        Kent, S., and R. Atkinson, "IP Encapsulating Security
                Payload", RFC 2406, November 1998.

   [AH]         Kent, S., and R. Atkinson, "IP Authentication Header",
                RFC 2402, November 1998.

   [Thayer97a]  Thayer, R., Doraswamy, N., and R. Glenn, "IP Security
                Document Roadmap", RFC 2411, November 1998.

   [RFC-2202]   Cheng, P., and R. Glenn, "Test Cases for HMAC-MD5 and
                HMAC-SHA-1", RFC 2202, March 1997.

   [RFC-2119]   Bradner, S., "Key words for use in RFCs to Indicate
                Requirement Levels", BCP 14, RFC 2119, March 1997.

8.  Editors' Address

   Cheryl Madson
   Cisco Systems, Inc.

   EMail: [email protected]

   Rob Glenn

   EMail: [email protected]

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RFC 2404       The Use of HMAC-SHA-1-96 within ESP and AH  November 1998

 The IPsec working group can be contacted through the chairs:

   Robert Moskowitz

   EMail: [email protected]

   Ted T'so
   Massachusetts Institute of Technology

   EMail: [email protected]

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RFC 2404       The Use of HMAC-SHA-1-96 within ESP and AH  November 1998

9.  Full Copyright Statement

   Copyright (C) The Internet Society (1998).  All Rights Reserved.

   This document and translations of it may be copied and furnished to
   others, and derivative works that comment on or otherwise explain it
   or assist in its implementation may be prepared, copied, published
   and distributed, in whole or in part, without restriction of any
   kind, provided that the above copyright notice and this paragraph are
   included on all such copies and derivative works.  However, this
   document itself may not be modified in any way, such as by removing
   the copyright notice or references to the Internet Society or other
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   followed, or as required to translate it into languages other than

   The limited permissions granted above are perpetual and will not be
   revoked by the Internet Society or its successors or assigns.

   This document and the information contained herein is provided on an

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