How to enable Freeradius to support a smart card with AES encryption algorithm?

["yao guoxian" <yaoguoxian@gmail.com>]

Hi!
    I have a smart card emluator which suports AES, not MD5 encryption algorithm. Is it possible to enable Freeradius to support my smart card  emlulator?
    I have an idea as follow:
    First,amending client agent (NAS) daemon program to make it send chap-password which is produced with AES, not MD5. The usual md5 chap-password is produced as MD5( user-packet-ID+user-secret+16 bytes authenticator), while the aes chap-password is produced as AES(16 bytes authenticator) using user-secret as 
key.The usual md5 chap-passwor attribute in an Access Request packet is as follow:
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|  code = 3 |  Length = 19  | user-packet-ID  |  16 bytes value|
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While the aes chap-password replaced the 16 bytes value ( MD5( user-packet-ID+user-secret+16 bytes authenticator)) with AES(16 bytes authenticator).
    Second ,amending rlm-chap.c to alter it  to  use  AES  to  analyze  the  request packet.
    Is it practical? Appreciate any suggestions.

regards
Guoxian