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mtp_obfuscated: specify some binary part sizes

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Сергей Прохоров 2019-05-26 03:47:57 +02:00
parent 24ef827705
commit 9b8f382bc6
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1 changed files with 4 additions and 4 deletions
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src/mtp_obfuscated.erl
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@ -64,11 +64,11 @@ client_create(Seed, Secret, Protocol, DcId) when byte_size(Seed) == 58,
%% init_up_encrypt/2
<<_:8/binary, ToRev:(?KEY_LEN + ?IV_LEN)/binary, _/binary>> = Raw,
<<DecKeySeed:?KEY_LEN/binary, DecIv:?IV_LEN/binary>> = bin_rev(ToRev),
DecKey = crypto:hash('sha256', <<DecKeySeed/binary, Secret/binary>>),
DecKey = crypto:hash('sha256', <<DecKeySeed:?KEY_LEN/binary, Secret:16/binary>>),
%% init_up_decrypt/2
<<_:8/binary, EncKeySeed:?KEY_LEN/binary, EncIv:?IV_LEN/binary, _/binary>> = Raw,
EncKey = crypto:hash('sha256', <<EncKeySeed/binary, Secret/binary>>),
EncKey = crypto:hash('sha256', <<EncKeySeed:?KEY_LEN/binary, Secret:16/binary>>),
Codec = new(EncKey, EncIv, DecKey, DecIv),
{<<_:56/binary, Encrypted:8/binary>>, Codec1} = encrypt(Raw, Codec),
@ -138,12 +138,12 @@ init_up_encrypt(Bin, Secret) ->
Rev = bin_rev(ToRev),
<<KeySeed:?KEY_LEN/binary, IV:?IV_LEN/binary>> = Rev,
%% <<_:32/binary, RevIV:16/binary, _/binary>> = Bin,
Key = crypto:hash('sha256', <<KeySeed/binary, Secret/binary>>),
Key = crypto:hash('sha256', <<KeySeed:?KEY_LEN/binary, Secret:16/binary>>),
{Key, IV}.
init_up_decrypt(Bin, Secret) ->
<<_:8/binary, KeySeed:?KEY_LEN/binary, IV:?IV_LEN/binary, _/binary>> = Bin,
Key = crypto:hash('sha256', <<KeySeed/binary, Secret/binary>>),
Key = crypto:hash('sha256', <<KeySeed:?KEY_LEN/binary, Secret:16/binary>>),
{Key, IV}.
get_protocol(<<16#ef, 16#ef, 16#ef, 16#ef, _:2/binary>>) ->