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leo_ssec: Added wrapper for SSE #13

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Apr 13, 2018
Merged

leo_ssec: Added wrapper for SSE #13

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64 changes: 64 additions & 0 deletions src/leo_ssec.erl
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Original file line number Diff line number Diff line change
Expand Up @@ -22,11 +22,14 @@
-module(leo_ssec).
-author("kunal.tyagi").

-export([encrypt_object/2, decrypt_object/4]).
-export([gen_salt/1, gen_hash/3,
verify_key/3,
verify_block_encryption/3, verify_stream_encryption/3,
block_encrypt_data/2, block_encrypt_data/3,
block_encrypt_data/4,
block_decrypt_data/2, block_decrypt_data/3,
block_decrypt_data/4,
stream_encrypt_data/3, stream_encrypt_data/4,
stream_decrypt_data/3, stream_decrypt_data/4,
verify_ssec_algorithm/1, verify_ssec_key/2
Expand All @@ -41,6 +44,40 @@
%% API
%%-------------------------------------------------------------------------

%% @doc High Level Wrapper for SSE-C encryption
-spec(encrypt_object(Object, UserKey) ->
{ok, Cipher, Hash, Salt} when Object::crypto:io_data(),
UserKey::crypto:io_data(),
Cipher::binary(),
Hash::binary(),
Salt::binary()).
encrypt_object(Object, UserKey) ->
{ok, Salt} = gen_salt(32),
<<IV:16/binary, _/binary>> = Salt,
{sha256, Hash} = gen_hash(sha256, UserKey, Salt),
AlgoMeta = {aes_cbc256, rfc5652, 16},
Cipher = block_encrypt_data(UserKey, Object, AlgoMeta, IV),
{ok, Cipher, Hash, Salt}.

%% @doc High Level Wrapper for SSE-C decryption
-spec(decrypt_object(Cipher, UserKey, Hash, Salt) ->
{error, invalid}|{ok, Object}
when Object::crypto:io_data(),
UserKey::crypto:io_data(),
Cipher::binary(),
Hash::binary(),
Salt::binary()).
decrypt_object(Cipher, UserKey, Hash, Salt) ->
case verify_key(UserKey, Salt, {sha256, Hash}) of
false ->
{error, invalid};
true ->
<<IV:16/binary, _/binary>> = Salt,
AlgoMeta = {aes_cbc256, rfc5652, 16},
Object = block_decrypt_data(UserKey, Cipher, AlgoMeta, IV),
{ok, Object}
end.

%% @doc Contains all details about the algorithm and related options
%% Ensures simple encryption, decryption and storage op options
%% {AlgorithmType, PaddingType, MaxBitsToPad}
Expand Down Expand Up @@ -127,6 +164,20 @@ block_encrypt_data(UserKey, Data, AlgoMetaData) ->
PadData = pad(Pad, PadLen, Data),
crypto:block_encrypt(Algo, UserKey, PadData).

%% @doc block encrypt data using key and custome settings with IV
%%
-spec(block_encrypt_data(UserKey, Data, AlgoMetaData, IV) ->
CipherPadData when UserKey::crypto:block_key(),
Data::crypto:io_data(),
AlgoMetaData::algo_metadata(),
IV::crypto:io_data(),
CipherPadData::binary()).
block_encrypt_data(UserKey, Data, AlgoMetaData, IV) ->
{Algo, Pad, PadLen} = AlgoMetaData,
PadData = pad(Pad, PadLen, Data),
crypto:block_encrypt(Algo, UserKey, IV, PadData).


%% @doc stream encrypt data using user key
%%
-spec(stream_encrypt_data(State, Data) ->
Expand Down Expand Up @@ -182,6 +233,19 @@ block_decrypt_data(UserKey, Data, AlgoMetaData) ->
PadData = crypto:block_decrypt(Algo, UserKey, Data),
unpad(Pad, PadData).

%% @doc block decrypt data using key and custome settings with IV
%%
-spec(block_decrypt_data(UserKey, Data, AlgoMetaData, IV) ->
PlainData when UserKey::crypto:block_key(),
Data::binary(),
AlgoMetaData::algo_metadata(),
IV::binary(),
PlainData::iodata()).
block_decrypt_data(UserKey, Data, AlgoMetaData, IV) ->
{Algo, Pad, _PadLen} = AlgoMetaData,
PadData = crypto:block_decrypt(Algo, UserKey, IV, Data),
unpad(Pad, PadData).

%% @doc stream decrypt data using the user key
%%
-spec(stream_decrypt_data(UserKey, Data, AlgoMetaData) ->
Expand Down
15 changes: 13 additions & 2 deletions test/leo_ssec_tests.erl
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Original file line number Diff line number Diff line change
Expand Up @@ -52,7 +52,10 @@ run_test_() ->
{"test verify_ssec_algorithm/1",
{timeout, timer:seconds(3), fun test_verify_ssec_algorithm/0}},
{"test verify_ssec_key/1",
{timeout, timer:seconds(3), fun test_verify_ssec_key/0}}
{timeout, timer:seconds(3), fun test_verify_ssec_key/0}},
{"test encrypt_object/2 and decrypt_object/4",
{timeout, timer:seconds(3),
fun() -> check_wrapper(fun check_en_de/1, 1, 256) end}}
]}.

%% Test 1
Expand Down Expand Up @@ -128,7 +131,7 @@ test_verify_ssec_key() ->
?assertMatch({false, _}, leo_ssec:verify_ssec_key(Base64Key1,
{md5, "ABCD" ++ Base64Checksum1})).

%% Test 6
%% Test 7
-spec(verify_pad_unpad_test_() -> boolean()).
verify_pad_unpad_test_() ->
[
Expand All @@ -155,4 +158,12 @@ verify_pad_unpad_test_() ->
end
].

%% Test 8
check_en_de(Len) ->
RBin = crypto:strong_rand_bytes(Len),
Key = crypto:strong_rand_bytes(32),
{ok, Cipher, Hash, Salt} = leo_ssec:encrypt_object(RBin, Key),
{ok, RBin} = leo_ssec:decrypt_object(Cipher, Key, Hash, Salt),
ok.

-endif.