QPQ-AG/enacl
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Improve and verify sign_*_detached functions.

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Provide non-dirty-scheduler variants for small strings, accurately bump
reductions for these strings.

While here, provide EQC test cases for the two functions.
This commit is contained in:
Jesper Louis Andersen
2015-08-12 23:11:41 +02:00
parent 7b64f3e52b
commit 92109eb354
4 changed files with 75 additions and 13 deletions
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src/enacl.erl
+15 -3
View File
@@ -395,7 +395,13 @@ sign_open(SM, PK) ->
M :: iodata(),
SK :: binary(),
DS :: binary().
sign_detached(M, SK) -> enacl_nif:crypto_sign_detached(M, SK).
sign_detached(M, SK) ->
case iolist_size(M) of
K when K =< ?SIGN_SIZE ->
bump(enacl_nif:crypto_sign_detached_b(M, SK), ?SIGN_REDUCTIONS, ?SIGN_SIZE, K);
_ ->
enacl_nif:crypto_sign_detached(M, SK)
end.
%% @doc sign_verify_detached/3 verifies the given signature against the given
%% message for the given public key.
@@ -408,8 +414,14 @@ sign_detached(M, SK) -> enacl_nif:crypto_sign_detached(M, SK).
M :: iodata(),
PK :: binary().
sign_verify_detached(SIG, M, PK) ->
case enacl_nif:crypto_sign_verify_detached(SIG, M, PK) of
true -> {ok, M};
SignRes = case iolist_size(M) of
K when K =< ?SIGN_SIZE ->
bump(enacl_nif:crypto_sign_verify_detached_b(SIG, M, PK), ?SIGN_REDUCTIONS, ?SIGN_SIZE, K);
_ ->
enacl_nif:crypto_sign_detached(SIG, M, PK)
end,
case SignRes of
true -> {ok, M};
false -> {error, failed_verification}
end.
src/enacl_nif.erl
+6 -1
View File
@@ -34,7 +34,9 @@
crypto_sign_open_b/2,
crypto_sign_detached/2,
crypto_sign_detached_b/2,
crypto_sign_verify_detached/3,
crypto_sign_verify_detached_b/3,
crypto_box_seal/2,
crypto_box_seal_open/3,
@@ -153,7 +155,10 @@ crypto_sign_open(_SignedMessage, _PK) -> erlang:nif_error(nif_not_loaded).
crypto_sign_open_b(_SignedMessage, _PK) -> erlang:nif_error(nif_not_loaded).
crypto_sign_detached(_M, _SK) -> erlang:nif_error(nif_not_loaded).
crypto_sign_verify_detached(_SIG, _M, _PK) -> erlang:nif_error(nif_not_loaded).
crypto_sign_detached_b(_M, _SK) -> erlang:nif_error(nif_not_loaded).
crypto_sign_verify_detached(_Sig, _M, _PK) -> erlang:nif_error(nif_not_loaded).
crypto_sign_verify_detached_b(_Sig, _M, _PK) -> erlang:nif_error(nif_not_loaded).
crypto_box_seal(_Msg, _PK) -> erlang:nif_error(nif_not_loaded).
crypto_box_seal_open(_CipherText, _PK, _SK) -> erlang:nif_error(nif_not_loaded).