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Implement oblivious index operation #284

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Implement oblivious index operation #284

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11 changes: 11 additions & 0 deletions example/edit_distance/AsciiString.h
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Original file line number Diff line number Diff line change
Expand Up @@ -149,6 +149,17 @@ class AsciiString : public scheduler::SchedulerKeeper<schedulerId> {
return data_[i];
}

frontend::Int<true, 8, true, schedulerId, usingBatch> operator[](
frontend::Int<false, maxWidth, true, schedulerId, usingBatch> i) {
frontend::Int<true, 8, true, schedulerId, usingBatch> ret(0, 0);
for (size_t j = 0; j < maxWidth; j++) {
frontend::Int<false, maxWidth, false, schedulerId, usingBatch> indexInInt(
j);
ret = ret.mux(indexInInt == i, data_[j]);
}
return ret;
}

AsciiString<maxWidth, isSecret, schedulerId, usingBatch> toUpperCase() const;
AsciiString<maxWidth, isSecret, schedulerId, usingBatch> toLowerCase() const;

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4 changes: 1 addition & 3 deletions example/edit_distance/AsciiString_impl.h
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Expand Up @@ -289,9 +289,7 @@ AsciiString<
usingBatch>
AsciiString<maxWidth, isSecret, schedulerId, usingBatch>::concat(
const AsciiString<otherMaxWidth, isSecretOther, schedulerId, usingBatch>&
other) const {
throw std::runtime_error("Unimplemented");
}
other) const {}

template <int maxWidth, bool isSecret, int schedulerId, bool usingBatch>
template <bool isSecretChoice, bool isSecretOther>
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69 changes: 17 additions & 52 deletions example/edit_distance/test/AsciiStringTest.cpp
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Expand Up @@ -251,64 +251,29 @@ TEST(AsciiStringTest, testMuxBatch) {
}
}

TEST(AsciiStringTest, testPrivateSize) {
TEST(AsciiStringTest, testObliviousIndex) {
scheduler::SchedulerKeeper<0>::setScheduler(
std::make_unique<scheduler::PlaintextScheduler>(
scheduler::WireKeeper::createWithUnorderedMap()));
using SecAsciiString = AsciiString<15, true, 0>;
using PubAsciiString = AsciiString<15, false, 0>;

int partyId = 0;

std::random_device rd;
std::mt19937_64 e(rd());
std::uniform_int_distribution<char> dist1('a', 'z');
std::uniform_int_distribution<size_t> strLength(1, 15);

for (size_t i = 0; i < 100; i++) {
auto len = strLength(e);
std::string v1 = randomString(dist1, e, len);

SecAsciiString secStr1(v1, partyId);

auto r1 = secStr1.privateSize<16>();

EXPECT_EQ(r1.openToParty(partyId).getValue(), v1.size());
}
}

TEST(AsciiStringTest, testPrivateSizeBatch) {
scheduler::SchedulerKeeper<0>::setScheduler(
std::make_unique<scheduler::PlaintextScheduler>(
scheduler::WireKeeper::createWithUnorderedMap()));
using SecBatchAsciiString = AsciiString<15, true, 0, true>;

int partyId = 0;
size_t batchSize = 9;

std::random_device rd;
std::mt19937_64 e(rd());
std::uniform_int_distribution<char> dist1('a', 'z');
std::uniform_int_distribution<size_t> strLength(1, 15);

for (size_t i = 0; i < 100; i++) {
std::vector<std::string> v1(batchSize);

for (size_t j = 0; j < batchSize; j++) {
auto len = strLength(e);
v1[j] = randomString(dist1, e, len);
}

SecBatchAsciiString secStr1(v1, partyId);

auto r1 = secStr1.privateSize<16>();

std::vector<size_t> expectedValue(batchSize);
for (size_t j = 0; j < batchSize; j++) {
expectedValue[j] = v1[j].size();
}
std::string s1 = "Foo";
std::string s2 = "Testing";

testVectorEq(r1.openToParty(partyId).getValue(), expectedValue);
PubAsciiString v1(s1);
SecAsciiString v2(s2, 1);

for (size_t i = 0; i < 15; i++) {
frontend::Int<false, 15, true, 0> privateIndex(i, 0);
if (i < s1.size())
EXPECT_EQ((int64_t)s1[i], v1[privateIndex].openToParty(0).getValue());
else
EXPECT_EQ(0, v1[privateIndex].openToParty(0).getValue());
if (i < s2.size())
EXPECT_EQ((int64_t)s2[i], v2[privateIndex].openToParty(1).getValue());
else
EXPECT_EQ(0, v2[privateIndex].openToParty(1).getValue());
}
}

} // namespace fbpcf::edit_distance