Proposal: New SimAuth interface

[James Prestwood <james.prestwood@linux.intel.com>]

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Hello,

     The IWD project now has a need for SIM card access in order to 
authenticate to EAP-SIM/AKA WiFi networks, and will be using ofono for 
this functionality. In order to do this, the GSM/3G "authenticate" 
algorithm needs to be run on the (U)SIM. For this I am proposing a new 
interface: "org.ofono.SimAuth". I do have a few questions about what 
method(s)/interfaces would be preferred. Since 2G/3G take different 
inputs/outputs there are few possibilities:

1. Two different methods on org.ofono.SimAuth:

     AuthenticateSim()

         Input: "ay" RAND

         Output: "ay" SRES, "ay" KC

     AuthenticateUSim()

         Input: "ay" RAND, "ay" AUTN

         Output: "ay" RES, "ay" IK, "ay" CK, "ay" AUTS

2. One method on org.ofono.SimAuth, with more complex arguments e.g.

     Authenticate()

         Input: "s" type, a{ay} args

         Output: a{ay}

     This would return take in and return the correct arguments for 
2G/3G based on the "type" argument.

3. Separate interfaces for SIM/USIM (e.g. org.ofono.SimAuth and 
org.ofono.USimAuth). This would also allow the client to see if either 
SIM or USIM are supported before making any method calls.

If anyone has input on what would option would be preferred, or maybe a 
different way of doing it, that would be great!

Thanks,

James