mozilla-central/security/nss/gtests/freebl_gtest/kyber_unittest.cc

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// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at http://mozilla.org/MPL/2.0/.
#include "gtest/gtest.h"
#include "blapi.h"
#include "nss_scoped_ptrs.h"
#include "kat/kyber768_kat.h"
namespace nss_test {
class Kyber768Test : public ::testing::Test {};
TEST(Kyber768Test, ConsistencyTest) {
ScopedSECItem privateKey(
SECITEM_AllocItem(nullptr, nullptr, KYBER768_PRIVATE_KEY_BYTES));
ScopedSECItem publicKey(
SECITEM_AllocItem(nullptr, nullptr, KYBER768_PUBLIC_KEY_BYTES));
ScopedSECItem ciphertext(
SECITEM_AllocItem(nullptr, nullptr, KYBER768_CIPHERTEXT_BYTES));
ScopedSECItem secret(
SECITEM_AllocItem(nullptr, nullptr, KYBER_SHARED_SECRET_BYTES));
ScopedSECItem secret2(
SECITEM_AllocItem(nullptr, nullptr, KYBER_SHARED_SECRET_BYTES));
SECStatus rv = Kyber_NewKey(params_kyber768_round3, nullptr, privateKey.get(),
publicKey.get());
EXPECT_EQ(SECSuccess, rv);
rv = Kyber_Encapsulate(params_kyber768_round3, nullptr, publicKey.get(),
ciphertext.get(), secret.get());
EXPECT_EQ(SECSuccess, rv);
rv = Kyber_Decapsulate(params_kyber768_round3, privateKey.get(),
ciphertext.get(), secret2.get());
EXPECT_EQ(SECSuccess, rv);
EXPECT_EQ(secret->len, KYBER_SHARED_SECRET_BYTES);
EXPECT_EQ(secret2->len, KYBER_SHARED_SECRET_BYTES);
EXPECT_EQ(0, memcmp(secret->data, secret2->data, KYBER_SHARED_SECRET_BYTES));
}
TEST(Kyber768Test, InvalidParameterTest) {
ScopedSECItem privateKey(
SECITEM_AllocItem(nullptr, nullptr, KYBER768_PRIVATE_KEY_BYTES));
ScopedSECItem publicKey(
SECITEM_AllocItem(nullptr, nullptr, KYBER768_PUBLIC_KEY_BYTES));
ScopedSECItem ciphertext(
SECITEM_AllocItem(nullptr, nullptr, KYBER768_CIPHERTEXT_BYTES));
ScopedSECItem secret(
SECITEM_AllocItem(nullptr, nullptr, KYBER_SHARED_SECRET_BYTES));
SECStatus rv = Kyber_NewKey(params_kyber_invalid, nullptr, privateKey.get(),
publicKey.get());
EXPECT_EQ(SECFailure, rv);
rv = Kyber_NewKey(params_kyber768_round3, nullptr, privateKey.get(),
publicKey.get());
EXPECT_EQ(SECSuccess, rv);
rv = Kyber_Encapsulate(params_kyber_invalid, nullptr, publicKey.get(),
ciphertext.get(), secret.get());
EXPECT_EQ(SECFailure, rv);
rv = Kyber_Encapsulate(params_kyber768_round3, nullptr, publicKey.get(),
ciphertext.get(), secret.get());
EXPECT_EQ(SECSuccess, rv);
rv = Kyber_Decapsulate(params_kyber_invalid, privateKey.get(),
ciphertext.get(), secret.get());
EXPECT_EQ(SECFailure, rv);
rv = Kyber_Decapsulate(params_kyber768_round3, privateKey.get(),
ciphertext.get(), secret.get());
EXPECT_EQ(SECSuccess, rv);
}
TEST(Kyber768Test, InvalidPublicKeyTest) {
ScopedSECItem shortBuffer(SECITEM_AllocItem(nullptr, nullptr, 7));
ScopedSECItem privateKey(
SECITEM_AllocItem(nullptr, nullptr, KYBER768_PRIVATE_KEY_BYTES));
SECStatus rv = Kyber_NewKey(params_kyber768_round3, nullptr, privateKey.get(),
shortBuffer.get());
EXPECT_EQ(SECFailure, rv); // short publicKey buffer
}
TEST(Kyber768Test, InvalidCiphertextTest) {
ScopedSECItem shortBuffer(SECITEM_AllocItem(nullptr, nullptr, 7));
ScopedSECItem privateKey(
SECITEM_AllocItem(nullptr, nullptr, KYBER768_PRIVATE_KEY_BYTES));
ScopedSECItem publicKey(
SECITEM_AllocItem(nullptr, nullptr, KYBER768_PUBLIC_KEY_BYTES));
ScopedSECItem ciphertext(
SECITEM_AllocItem(nullptr, nullptr, KYBER768_CIPHERTEXT_BYTES));
ScopedSECItem secret(
SECITEM_AllocItem(nullptr, nullptr, KYBER_SHARED_SECRET_BYTES));
ScopedSECItem secret2(
SECITEM_AllocItem(nullptr, nullptr, KYBER_SHARED_SECRET_BYTES));
SECStatus rv = Kyber_NewKey(params_kyber768_round3, nullptr, privateKey.get(),
publicKey.get());
EXPECT_EQ(SECSuccess, rv);
rv = Kyber_Encapsulate(params_kyber768_round3, nullptr, publicKey.get(),
shortBuffer.get(), secret.get());
EXPECT_EQ(SECFailure, rv); // short ciphertext input
rv = Kyber_Encapsulate(params_kyber768_round3, nullptr, publicKey.get(),
ciphertext.get(), secret.get());
EXPECT_EQ(SECSuccess, rv);
// Modify a random byte in the ciphertext
size_t pos;
rv = RNG_GenerateGlobalRandomBytes((uint8_t*)&pos, sizeof(pos));
EXPECT_EQ(SECSuccess, rv);
uint8_t byte;
rv = RNG_GenerateGlobalRandomBytes((uint8_t*)&byte, sizeof(byte));
EXPECT_EQ(SECSuccess, rv);
EXPECT_EQ(ciphertext->len, KYBER768_CIPHERTEXT_BYTES);
ciphertext->data[pos % KYBER768_CIPHERTEXT_BYTES] ^= (byte | 1);
rv = Kyber_Decapsulate(params_kyber768_round3, privateKey.get(),
ciphertext.get(), secret2.get());
EXPECT_EQ(SECSuccess, rv);
EXPECT_EQ(secret->len, KYBER_SHARED_SECRET_BYTES);
EXPECT_EQ(secret2->len, KYBER_SHARED_SECRET_BYTES);
EXPECT_NE(0, memcmp(secret->data, secret2->data, KYBER_SHARED_SECRET_BYTES));
}
TEST(Kyber768Test, InvalidPrivateKeyTest) {
ScopedSECItem shortBuffer(SECITEM_AllocItem(nullptr, nullptr, 7));
ScopedSECItem privateKey(
SECITEM_AllocItem(nullptr, nullptr, KYBER768_PRIVATE_KEY_BYTES));
ScopedSECItem publicKey(
SECITEM_AllocItem(nullptr, nullptr, KYBER768_PUBLIC_KEY_BYTES));
ScopedSECItem ciphertext(
SECITEM_AllocItem(nullptr, nullptr, KYBER768_CIPHERTEXT_BYTES));
ScopedSECItem secret(
SECITEM_AllocItem(nullptr, nullptr, KYBER_SHARED_SECRET_BYTES));
ScopedSECItem secret2(
SECITEM_AllocItem(nullptr, nullptr, KYBER_SHARED_SECRET_BYTES));
SECStatus rv = Kyber_NewKey(params_kyber768_round3, nullptr,
shortBuffer.get(), publicKey.get());
EXPECT_EQ(SECFailure, rv); // short privateKey buffer
rv = Kyber_NewKey(params_kyber768_round3, nullptr, privateKey.get(),
publicKey.get());
EXPECT_EQ(SECSuccess, rv);
rv = Kyber_Encapsulate(params_kyber768_round3, nullptr, publicKey.get(),
ciphertext.get(), secret.get());
EXPECT_EQ(SECSuccess, rv);
// Modify a random byte in the private key
size_t pos;
rv = RNG_GenerateGlobalRandomBytes((uint8_t*)&pos, sizeof(pos));
EXPECT_EQ(SECSuccess, rv);
uint8_t byte;
rv = RNG_GenerateGlobalRandomBytes((uint8_t*)&byte, sizeof(byte));
EXPECT_EQ(SECSuccess, rv);
// Modifying the implicit rejection key will not cause decapsulation failure.
EXPECT_EQ(privateKey->len, KYBER768_PRIVATE_KEY_BYTES);
privateKey
->data[pos % (KYBER768_PRIVATE_KEY_BYTES - KYBER_SHARED_SECRET_BYTES)] ^=
(byte | 1);
rv = Kyber_Decapsulate(params_kyber768_round3, privateKey.get(),
ciphertext.get(), secret2.get());
EXPECT_EQ(SECSuccess, rv);
EXPECT_EQ(secret->len, KYBER_SHARED_SECRET_BYTES);
EXPECT_EQ(secret2->len, KYBER_SHARED_SECRET_BYTES);
EXPECT_NE(0, memcmp(secret->data, secret2->data, KYBER_SHARED_SECRET_BYTES));
}
TEST(Kyber768Test, DecapsulationWithModifiedRejectionKeyTest) {
ScopedSECItem privateKey(
SECITEM_AllocItem(nullptr, nullptr, KYBER768_PRIVATE_KEY_BYTES));
ScopedSECItem publicKey(
SECITEM_AllocItem(nullptr, nullptr, KYBER768_PUBLIC_KEY_BYTES));
ScopedSECItem ciphertext(
SECITEM_AllocItem(nullptr, nullptr, KYBER768_CIPHERTEXT_BYTES));
ScopedSECItem secret(
SECITEM_AllocItem(nullptr, nullptr, KYBER_SHARED_SECRET_BYTES));
ScopedSECItem secret2(
SECITEM_AllocItem(nullptr, nullptr, KYBER_SHARED_SECRET_BYTES));
ScopedSECItem secret3(
SECITEM_AllocItem(nullptr, nullptr, KYBER_SHARED_SECRET_BYTES));
SECStatus rv = Kyber_NewKey(params_kyber768_round3, nullptr, privateKey.get(),
publicKey.get());
EXPECT_EQ(SECSuccess, rv);
rv = Kyber_Encapsulate(params_kyber768_round3, nullptr, publicKey.get(),
ciphertext.get(), secret.get());
EXPECT_EQ(SECSuccess, rv);
// Modify a random byte in the ciphertext and decapsulate it
size_t pos;
rv = RNG_GenerateGlobalRandomBytes((uint8_t*)&pos, sizeof(pos));
EXPECT_EQ(SECSuccess, rv);
uint8_t byte;
rv = RNG_GenerateGlobalRandomBytes((uint8_t*)&byte, sizeof(byte));
EXPECT_EQ(SECSuccess, rv);
EXPECT_EQ(ciphertext->len, KYBER768_CIPHERTEXT_BYTES);
ciphertext->data[pos % KYBER768_CIPHERTEXT_BYTES] ^= (byte | 1);
rv = Kyber_Decapsulate(params_kyber768_round3, privateKey.get(),
ciphertext.get(), secret2.get());
EXPECT_EQ(SECSuccess, rv);
// Now, modify a random byte in the implicit rejection key and try
// the decapsulation again. The result should be different.
rv = RNG_GenerateGlobalRandomBytes((uint8_t*)&pos, sizeof(pos));
EXPECT_EQ(SECSuccess, rv);
rv = RNG_GenerateGlobalRandomBytes((uint8_t*)&byte, sizeof(byte));
EXPECT_EQ(SECSuccess, rv);
pos = (KYBER768_PRIVATE_KEY_BYTES - KYBER_SHARED_SECRET_BYTES) +
(pos % KYBER_SHARED_SECRET_BYTES);
EXPECT_EQ(privateKey->len, KYBER768_PRIVATE_KEY_BYTES);
privateKey->data[pos] ^= (byte | 1);
rv = Kyber_Decapsulate(params_kyber768_round3, privateKey.get(),
ciphertext.get(), secret3.get());
EXPECT_EQ(SECSuccess, rv);
EXPECT_EQ(secret2->len, KYBER_SHARED_SECRET_BYTES);
EXPECT_EQ(secret3->len, KYBER_SHARED_SECRET_BYTES);
EXPECT_NE(0, memcmp(secret2->data, secret3->data, KYBER_SHARED_SECRET_BYTES));
}
TEST(Kyber768Test, KnownAnswersTest) {
ScopedSECItem privateKey(
SECITEM_AllocItem(nullptr, nullptr, KYBER768_PRIVATE_KEY_BYTES));
ScopedSECItem publicKey(
SECITEM_AllocItem(nullptr, nullptr, KYBER768_PUBLIC_KEY_BYTES));
ScopedSECItem ciphertext(
SECITEM_AllocItem(nullptr, nullptr, KYBER768_CIPHERTEXT_BYTES));
ScopedSECItem secret(
SECITEM_AllocItem(nullptr, nullptr, KYBER_SHARED_SECRET_BYTES));
ScopedSECItem secret2(
SECITEM_AllocItem(nullptr, nullptr, KYBER_SHARED_SECRET_BYTES));
SECStatus rv;
uint8_t digest[SHA256_LENGTH];
for (const auto& kat : KyberKATs) {
SECItem keypair_seed = {siBuffer, (unsigned char*)kat.newKeySeed,
sizeof kat.newKeySeed};
SECItem enc_seed = {siBuffer, (unsigned char*)kat.encapsSeed,
sizeof kat.encapsSeed};
rv = Kyber_NewKey(kat.params, &keypair_seed, privateKey.get(),
publicKey.get());
EXPECT_EQ(SECSuccess, rv);
SHA256_HashBuf(digest, privateKey->data, privateKey->len);
EXPECT_EQ(0, memcmp(kat.privateKeyDigest, digest, sizeof digest));
SHA256_HashBuf(digest, publicKey->data, publicKey->len);
EXPECT_EQ(0, memcmp(kat.publicKeyDigest, digest, sizeof digest));
rv = Kyber_Encapsulate(kat.params, &enc_seed, publicKey.get(),
ciphertext.get(), secret.get());
EXPECT_EQ(SECSuccess, rv);
SHA256_HashBuf(digest, ciphertext->data, ciphertext->len);
EXPECT_EQ(0, memcmp(kat.ciphertextDigest, digest, sizeof digest));
EXPECT_EQ(secret->len, KYBER_SHARED_SECRET_BYTES);
EXPECT_EQ(0, memcmp(kat.secret, secret->data, secret->len));
rv = Kyber_Decapsulate(kat.params, privateKey.get(), ciphertext.get(),
secret2.get());
EXPECT_EQ(SECSuccess, rv);
EXPECT_EQ(secret2->len, KYBER_SHARED_SECRET_BYTES);
EXPECT_EQ(0, memcmp(secret->data, secret2->data, secret2->len));
}
}
} // namespace nss_test