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%%%
%%% Created: Apr 2006 by Jason Tucker <jasonwtucker@gmail.com>
%%%
%%% Modified by Nicolas Niclausse
%%%
%%% This program is free software; you can redistribute it and/or modify
%%% it under the terms of the GNU General Public License as published by
%%% the Free Software Foundation; either version 2 of the License, or
%%% (at your option) any later version.
%%%
%%% This program is distributed in the hope that it will be useful,
%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
%%% GNU General Public License for more details.
%%%
%%% You should have received a copy of the GNU General Public License
%%% along with this program; if not, write to the Free Software
%%% Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
%%%
%%% In addition, as a special exception, you have the permission to
%%% link the code of this program with any library released under
%%% the EPL license and distribute linked combinations including
%%% the two.
-module(ts_digest).
-author('jasonwtucker@gmail.com').
-export([ digest/2, sip_digest/4,
md5hex/1, shahex/1, tohex/1
]).
%%%----------------------------------------------------------------------
%%% Func: sip_digest/4
%%%----------------------------------------------------------------------
sip_digest(Nonce, Jid, Realm, Passwd) ->
HA1 = md5hex(Jid ++ ":" ++ Realm ++ ":" ++ Passwd),
HA2 = md5hex("REGISTER:" ++ Jid),
INTEGRITY = md5hex(Nonce ++ ":" ++ HA2),
HA3 = md5hex(HA1 ++ ":" ++ INTEGRITY),
{HA3,INTEGRITY}.
%%%----------------------------------------------------------------------
%%% Func: digest/2
%%% Computes XMPP digest password described in JEP-0078
%%%----------------------------------------------------------------------
digest(Sid, Passwd) ->
HA1 = shahex(Sid ++ Passwd),
{HA1}.
%%%----------------------------------------------------------------------
%%% Func: md5hex/1
%%%----------------------------------------------------------------------
md5hex(Clear) ->
tohex(binary_to_list(erlang:md5(Clear))).
%%%----------------------------------------------------------------------
%%% Func: shahex/1
%%%----------------------------------------------------------------------
shahex(Clear) ->
ShaVal= case catch crypto:sha(Clear) of
{'EXIT',_} ->
crypto:start(),
crypto:sha(Clear);
Sha -> Sha
end,
tohex(binary_to_list(ShaVal)).
%%%----------------------------------------------------------------------
%%% Func: tohex/1
%%% Purpose: convert list of integers to hexadecimal string
%%%----------------------------------------------------------------------
tohex(A)->
Fun = fun(X)->
ts_utils:to_lower(padhex(httpd_util:integer_to_hexlist(X)))
end,
lists:flatten( lists:map(Fun, A) ).
%%%----------------------------------------------------------------------
%%% Func: padhex/1
%%% Purpose: needed because httpd_util:integer_to_hexlist returns hex
%%% values <10 as only 1 character, ie. "0F" is simply returned as
%%% "F". For our digest, we need these leading zeros to be present.
%%% ----------------------------------------------------------------------
padhex(S=[_Char]) -> "0" ++ S;
padhex(String) -> String.
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