Help: PAP with Sha1

[vishal_nitr]

Hi,    I am using free-radius-2.1.12. I see that radius uses MD5 for encoding/decoding passwords. I am using PAP authentication.    In my radius client I changed encoding to SHA1; due to which radius started rejecting auth requests saying password mismatch from rlm_pap which is obvious.     I tried changing few things in lib/radius.c to SHA1 but with no success.
I ran radiusd with -X option and I saw following:With MD5 from client:        User-Name = "vishal"        Calling-Station-Id = "00-23-68-0F-1A-E6"        NAS-Port = 0        NAS-Port-Type = Wireless-802.11        Framed-MTU = 1400        Service-Type = Framed-User        NAS-IP-Address = 127.0.0.1        NAS-Identifier = "ap7131-0F1AE6"        NAS-Port-Id = "0"        User-Password = "vishal123"
With SHA1 from client:        User-Name = "vishal"        Calling-Station-Id = "00-23-68-0F-1A-E6"        NAS-Port = 0        NAS-Port-Type = Wireless-802.11        Framed-MTU = 1400        Service-Type = Framed-User        NAS-IP-Address = 127.0.0.1        NAS-Identifier = "ap7131-0F1AE6"        NAS-Port-Id = "0"        User-Password = "\356Ew\2310\347\326\367h\r1\223,\224\024\352\027\241>5"

Alan Dekok just informed me that RADIUS uses MD5 and it can't be changed (thanks ALAN). And I don't want to go against protocol. But as I have spent almost a week in finding a location where RADIUS decodes the password received from client. Please can somebody point me the place where this happens.
Thanks and Regards,

Vishal Kotalwar,
Bangalore-35.

09900055647.
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