82 lines
2.7 KiB
Erlang
82 lines
2.7 KiB
Erlang
%%%----------------------------------------------------------------------
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%%% File : scram.erl
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%%% Author : Stephen Röttger <stephen.roettger@googlemail.com>
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%%% Purpose : SCRAM (RFC 5802)
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%%% Created : 7 Aug 2011 by Stephen Röttger <stephen.roettger@googlemail.com>
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%%%
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%%%
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%%% ejabberd, Copyright (C) 2002-2018 ProcessOne
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%%%
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%%% This program is free software; you can redistribute it and/or
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%%% modify it under the terms of the GNU General Public License as
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%%% published by the Free Software Foundation; either version 2 of the
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%%% License, or (at your option) any later version.
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%%%
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%%% This program is distributed in the hope that it will be useful,
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%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
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%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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%%% General Public License for more details.
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%%%
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%%% You should have received a copy of the GNU General Public License along
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%%% with this program; if not, write to the Free Software Foundation, Inc.,
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%%% 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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%%%
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%%%----------------------------------------------------------------------
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-module(scram).
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-author('stephen.roettger@googlemail.com').
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%% External exports
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%% ejabberd doesn't implement SASLPREP, so we use the similar RESOURCEPREP instead
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-export([salted_password/3, stored_key/1, server_key/1,
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server_signature/2, client_signature/2, client_key/1,
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client_key/2]).
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-spec salted_password(binary(), binary(), non_neg_integer()) -> binary().
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salted_password(Password, Salt, IterationCount) ->
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hi(jid:resourceprep(Password), Salt, IterationCount).
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-spec client_key(binary()) -> binary().
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client_key(SaltedPassword) ->
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sha_mac(SaltedPassword, <<"Client Key">>).
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-spec stored_key(binary()) -> binary().
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stored_key(ClientKey) -> crypto:hash(sha, ClientKey).
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-spec server_key(binary()) -> binary().
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server_key(SaltedPassword) ->
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sha_mac(SaltedPassword, <<"Server Key">>).
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-spec client_signature(binary(), binary()) -> binary().
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client_signature(StoredKey, AuthMessage) ->
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sha_mac(StoredKey, AuthMessage).
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-spec client_key(binary(), binary()) -> binary().
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client_key(ClientProof, ClientSignature) ->
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crypto:exor(ClientProof, ClientSignature).
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-spec server_signature(binary(), binary()) -> binary().
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server_signature(ServerKey, AuthMessage) ->
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sha_mac(ServerKey, AuthMessage).
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hi(Password, Salt, IterationCount) ->
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U1 = sha_mac(Password, <<Salt/binary, 0, 0, 0, 1>>),
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crypto:exor(U1, hi_round(Password, U1, IterationCount - 1)).
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hi_round(Password, UPrev, 1) ->
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sha_mac(Password, UPrev);
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hi_round(Password, UPrev, IterationCount) ->
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U = sha_mac(Password, UPrev),
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crypto:exor(U, hi_round(Password, U, IterationCount - 1)).
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sha_mac(Key, Data) ->
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crypto:hmac(sha, Key, Data).
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