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#include <gtest/gtest.h>
#include <stdexcept>
#include "encoder.h"
#include "openssl_hash_impl.h"
#include "unix_kernel_rand_impl.h"
// We need the same "random" inputs to the IRR
// each time to have reproducible tests.
FILE* mock_urandom(void) {
int i;
FILE *fp;
fp = tmpfile();
for (i = 0; i < 1024; i++) {
fputc((i * 17) % 256, fp);
}
fflush(fp);
fp = freopen(NULL, "r", fp);
return fp;
}
class EncoderTest : public ::testing::Test {
protected:
EncoderTest() {
encoder_id = std::string("metric-name").c_str();
fp = mock_urandom();
irr_rand = new rappor::UnixKernelRand(fp);
}
virtual ~EncoderTest() {
fclose(fp);
delete irr_rand;
delete deps;
delete params;
delete encoder;
}
FILE* fp; const char* encoder_id;
rappor::UnixKernelRand *irr_rand;
rappor::Deps *deps;
rappor::Params *params;
rappor::Encoder *encoder;
rappor::Bits bits_out;
std::vector<uint8_t> bits_vector;
};
// Uses HmacSha256 and 32-bit outputs.
class EncoderUint32Test : public EncoderTest {
protected:
EncoderUint32Test() {
deps = new rappor::Deps(rappor::Md5, "client-secret", rappor::HmacSha256,
*irr_rand);
params = new rappor::Params(32, // num_bits (k)
2, // num_hashes (h)
128, // num_cohorts (m)
0.25, // probability f for PRR
0.75, // probability p for IRR
0.5); // probability q for IRR
encoder = new rappor::Encoder(encoder_id, *params, *deps);
}
};
// Uses HmacDrbg and variable-size vector outputs.
class EncoderUnlimTest : public EncoderTest {
protected:
EncoderUnlimTest() {
deps = new rappor::Deps(rappor::Md5, "client-secret", rappor::HmacDrbg,
*irr_rand);
params = new rappor::Params(64, // num_bits (k)
2, // num_hashes (h)
128, // num_cohorts (m)
0.25, // probability f for PRR
0.75, // probability p for IRR
0.5); // probability q for IRR
encoder = new rappor::Encoder(encoder_id, *params, *deps);
}
};
///// EncoderUint32Test
TEST_F(EncoderUint32Test, EncodeStringUint32) {
ASSERT_TRUE(encoder->EncodeString("foo", &bits_out));
ASSERT_EQ(2281639167, bits_out);
ASSERT_EQ(3, encoder->cohort());
}
TEST_F(EncoderUint32Test, EncodeStringUint32Cohort) {
encoder->set_cohort(4); // Set pre-selected cohort.
ASSERT_TRUE(encoder->EncodeString("foo", &bits_out));
ASSERT_EQ(2281637247, bits_out);
ASSERT_EQ(4, encoder->cohort());
}
TEST_F(EncoderUint32Test, EncodeBitsUint32) {
ASSERT_TRUE(encoder->EncodeBits(0x123, &bits_out));
ASSERT_EQ(2784956095, bits_out);
ASSERT_EQ(3, encoder->cohort());
}
// Negative tests
// num_bits is negative.
TEST_F(EncoderUint32Test, NumBitsMustBePositiveDeathTest) {
::testing::FLAGS_gtest_death_test_style = "threadsafe";
delete params;
params = new rappor::Params(-1, // num_bits (k) [BAD]
2, // num_hashes (h)
128, // num_cohorts (m)
0.25, // probability f for PRR
0.75, // probability p for IRR
0.5); // probability q for IRR
EXPECT_DEATH(rappor::Encoder(encoder_id, *params, *deps),
"Assertion.*failed");
}
// num_hashes is negative.
TEST_F(EncoderUint32Test, NumHashesMustBePositiveDeathTest) {
::testing::FLAGS_gtest_death_test_style = "threadsafe";
delete params;
params = new rappor::Params(32, // num_bits (k)
-1, // num_hashes (h) [BAD]
128, // num_cohorts (m)
0.25, // probability f for PRR
0.75, // probability p for IRR
0.5); // probability q for IRR
EXPECT_DEATH(rappor::Encoder(encoder_id, *params, *deps),
"Assertion.*failed");
}
// num_cohorts is negative.
TEST_F(EncoderUint32Test, NumCohortsMustBePositiveDeathTest) {
::testing::FLAGS_gtest_death_test_style = "threadsafe";
delete params;
params = new rappor::Params(32, // num_bits (k)
2, // num_hashes (h)
-1, // num_cohorts (m) [BAD]
0.25, // probability f for PRR
0.75, // probability p for IRR
0.5); // probability q for IRR
EXPECT_DEATH(rappor::Encoder(encoder_id, *params, *deps),
"Encoder.*Assertion.*failed");
}
// Invalid probabilities.
TEST_F(EncoderUint32Test, InvalidProbabilitiesDeathTest) {
::testing::FLAGS_gtest_death_test_style = "threadsafe";
// prob_f negative.
delete params;
params = new rappor::Params(32, // num_bits (k)
2, // num_hashes (h)
1, // num_cohorts (m)
-0.1, // probability f for PRR [BAD]
0.75, // probability p for IRR
0.5); // probability q for IRR
EXPECT_DEATH(rappor::Encoder(encoder_id, *params, *deps),
"Assertion.*failed");
// prob_f > 1.
delete params;
params = new rappor::Params(32, // num_bits (k)
2, // num_hashes (h)
1, // num_cohorts (m)
1.1, // probability f for PRR [BAD]
0.75, // probability p for IRR
0.5); // probability q for IRR
EXPECT_DEATH(rappor::Encoder(encoder_id, *params, *deps),
"Assertion.*failed");
// prob_p < 0.
delete params;
params = new rappor::Params(32, // num_bits (k)
2, // num_hashes (h)
1, // num_cohorts (m)
0.25, // probability f for PRR
-0.1, // probability p for IRR [BAD]
0.5); // probability q for IRR
EXPECT_DEATH(rappor::Encoder(encoder_id, *params, *deps),
"Assertion.*failed");
// prob_p > 1.
delete params;
params = new rappor::Params(32, // num_bits (k)
2, // num_hashes (h)
1, // num_cohorts (m)
0.25, // probability f for PRR
1.1, // probability p for IRR [BAD]
0.5); // probability q for IRR
EXPECT_DEATH(rappor::Encoder(encoder_id, *params, *deps),
"Assertion.*failed");
// prob_q < 0.
delete params;
params = new rappor::Params(32, // num_bits (k)
2, // num_hashes (h)
1, // num_cohorts (m)
0.25, // probability f for PRR
0.75, // probability p for IRR
-0.1); // probability q for IRR [BAD]
EXPECT_DEATH(rappor::Encoder(encoder_id, *params, *deps),
"Assertion.*failed");
// prob_q > 1.
delete params;
params = new rappor::Params(32, // num_bits (k)
2, // num_hashes (h)
1, // num_cohorts (m)
0.25, // probability f for PRR
0.75, // probability p for IRR
1.1); // probability q for IRR [BAD]
EXPECT_DEATH(rappor::Encoder(encoder_id, *params, *deps),
"Assertion.*failed");
}
// num_bits 64 when only 32 bits are possible.
TEST_F(EncoderUint32Test, Sha256NoMoreThan32BitsDeathTest) {
::testing::FLAGS_gtest_death_test_style = "threadsafe";
delete params;
params = new rappor::Params(64, // num_bits (k)
2, // num_hashes (h)
128, // num_cohorts (m)
0.25, // probability f for PRR
0.75, // probability p for IRR
0.5); // probability q for IRR
EXPECT_DEATH(rappor::Encoder(encoder_id, *params, *deps),
"Assertion.*failed");
}
// num_hashes too high.
TEST_F(EncoderUint32Test, NumHashesNoMoreThan16DeathTest) {
::testing::FLAGS_gtest_death_test_style = "threadsafe";
delete params;
params = new rappor::Params(32, // num_bits (k)
17, // num_hashes (h)
128, // num_cohorts (m)
0.25, // probability f for PRR
0.75, // probability p for IRR
0.5); // probability q for IRR
EXPECT_DEATH(rappor::Encoder(encoder_id, *params, *deps),
"Assertion.*failed");
}
// EncoderString with 4-byte vector and HMACSHA256 and
// EncoderString with Uint32 and HMACSHA256 should match.
TEST_F(EncoderUint32Test, StringUint32AndStringVectorMatch) {
ASSERT_TRUE(encoder->EncodeString("foo", &bits_out));
ASSERT_EQ(2281639167, bits_out);
std::vector<uint8_t> expected_out(4);
expected_out[0] = (bits_out & 0xFF000000) >> 24;
expected_out[1] = (bits_out & 0x00FF0000) >> 16;
expected_out[2] = (bits_out & 0x0000FF00) >> 8;
expected_out[3] = bits_out & 0x000000FF;
// Reset the mock randomizer.
delete irr_rand;
delete deps;
delete encoder;
fclose(fp);
fp = mock_urandom();
irr_rand = new rappor::UnixKernelRand(fp);
deps = new rappor::Deps(rappor::Md5, "client-secret", rappor::HmacSha256,
*irr_rand);
encoder = new rappor::Encoder(encoder_id, *params, *deps);
ASSERT_TRUE(encoder->EncodeString("foo", &bits_vector));
ASSERT_EQ(expected_out, bits_vector);
}
///// EncoderUnlimTest
TEST_F(EncoderUnlimTest, EncodeStringUint64) {
static const uint8_t ex[] = { 134, 255, 11, 255, 252, 119, 240, 223 };
std::vector<uint8_t> expected_vector(ex, ex + sizeof(ex));
ASSERT_TRUE(encoder->EncodeString("foo", &bits_vector));
ASSERT_EQ(expected_vector, bits_vector);
ASSERT_EQ(93, encoder->cohort());
}
// Negative tests.
TEST_F(EncoderUnlimTest, NumBitsNotMultipleOf8DeathTest) {
::testing::FLAGS_gtest_death_test_style = "threadsafe";
delete params;
params = new rappor::Params(63, // num_bits (k) [BAD]
17, // num_hashes (h)
128, // num_cohorts (m)
0.25, // probability f for PRR
0.75, // probability p for IRR
0.5); // probability q for IRR
EXPECT_DEATH(rappor::Encoder(encoder_id, *params, *deps),
"Assertion.*failed");
}
int main(int argc, char **argv) {
::testing::InitGoogleTest(&argc, argv);
return RUN_ALL_TESTS();
}
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