JunHyuk Song
Jicheol Lee
INTERNET DRAFT Samsung Electronics
Expires: November 30, 2005 May 31 2005
The AES-CMAC-PRF-128 Algorithm for
the Internet Key Exchange Protocol (IKE)
draft-songlee-aes-cmac-prf-128-00.txt
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Copyright (C) The Internet Society (2005).
Abstract
Some implementations of IP Security (IPsec) may want to use a
pseudo-random function derived from the Advanced Encryption Standard
(AES). This memo describes such an algorithm, called AES-CMAC-
PRF-128.
Song and Lee. Expires November 2005 [Page 1]
Internet Draft May 2005
1. Introduction
[AES-CMAC] describes a method to use the Advanced Encryption Standard
(AES) as a message authentication code (MAC) whose output is 128 bits
long. 128 bits output is useful as a long-lived pseudo-random (PRF)
in either IKE version 1 or version 2. Both versions of IKE use the
PRF to create keys in a fashion that is dependent on the length of
the output of the PRF. This memo specify AES-CMAC use as a PRF whose
output is 128 bits, named AES-CMAC-PRF-128.
2. The AES-CMAC-PRF-128 Algorithm
The AES-CMAC-PRF-128 algorithm is identical to AES-CMAC defined
in [AES-CMAC].
The test vectors in appendix of [AES-CMAC] can be used for
AES-CMAC-PRF-128 as well.
3. Security Considerations
The security provided by AES-CMAC-PRF-128 is based upon the strength
of AES. At the time of this writing, there are no known practical
cryptographic attacks against AES or AES-CMAC-PRF-128.
As is true with any cryptographic algorithm, part of its strength
lies in the security of the key management mechanism, the strength of
the associated secret key, and upon the correctness of the
implementations in all of the participating systems. [AES-CMAC]
contains test vectors to assist in verifying the correctness of the
AES-CMAC-PRF-128 code.
4. Acknowledgement
Portions of this text were borrowed from [AES-XCBC-MAC].
5. References
[AES-CMAC] JunHyuk Song and Jicheol Lee, "The AES-CMAC
Algorithm," draft-songlee-aes-cmac-01.txt, May 2005.
[AES-XCBC-MAC] P. Hoffman, "The AES-XCBC-PRF-128 Algorithm for the
Internet Key Exchange Protocol (IKE)," RFC3664, Jan
2004.
Song and Lee. Expires November 2005 [Page 2]
Internet Draft May 2005
Author's Address
Junhyuk Song
Samsung Electronics
+82-31-279-3639
santajunman@hanafos.com
Jicheol Lee
Samsung Electronics
+82-31-279-3605
jicheol.lee@samsung.com
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Song and Lee. Expires November 2005 [Page 3]
Internet Draft May 2005
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Song and Lee. Expires November 2005 [Page 4]
