text: // Copyright 2017 Google Inc.
  //
  // Licensed under the Apache License, Version 2.0 (the "License");
  // you may not use this file except in compliance with the License.
  // You may obtain a copy of the License at
  //
  //      http://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing, software
  // distributed under the License is distributed on an "AS IS" BASIS,
  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  // See the License for the specific language governing permissions and
  // limitations under the License.
  //
  ////////////////////////////////////////////////////////////////////////////////
  
  #include "cc/subtle/aes_ctr_boringssl.h"
  
  #include <string>
  #include <vector>
  
  #include "cc/subtle/random.h"
  #include "cc/util/status.h"
  #include "cc/util/statusor.h"
  #include "cc/util/test_util.h"
  #include "gtest/gtest.h"
  
  namespace crypto {
  namespace tink {
  namespace subtle {
  namespace {
  
  TEST(AesCtrBoringSslTest, testEncryptDecrypt) {
    std::string key(test::HexDecodeOrDie("000102030405060708090a0b0c0d0e0f"));
    int iv_size = 12;
    auto res = AesCtrBoringSsl::New(key, iv_size);
    EXPECT_TRUE(res.ok()) << res.status();
    auto cipher = std::move(res.ValueOrDie());
    std::string message = "Some data to encrypt.";
    auto ct = cipher->Encrypt(message);
    EXPECT_TRUE(ct.ok()) << ct.status();
    EXPECT_EQ(ct.ValueOrDie().size(), message.size() + iv_size);
    auto pt = cipher->Decrypt(ct.ValueOrDie());
    EXPECT_TRUE(pt.ok()) << pt.status();
    EXPECT_EQ(pt.ValueOrDie(), message);
  }
  
  TEST(AesCtrBoringSslTest, testEncryptDecrypt_randomMessage) {
    std::string key(test::HexDecodeOrDie("000102030405060708090a0b0c0d0e0f"));
    int iv_size = 12;
    auto res = AesCtrBoringSsl::New(key, iv_size);
    EXPECT_TRUE(res.ok()) << res.status();
    auto cipher = std::move(res.ValueOrDie());
    for (int i = 0; i < 256; i++) {
      std::string message = Random::GetRandomBytes(i);
      auto ct = cipher->Encrypt(message);
      EXPECT_TRUE(ct.ok()) << ct.status();
      EXPECT_EQ(ct.ValueOrDie().size(), message.size() + iv_size);
      auto pt = cipher->Decrypt(ct.ValueOrDie());
      EXPECT_TRUE(pt.ok()) << pt.status();
      EXPECT_EQ(pt.ValueOrDie(), message);
    }
  }
  
  TEST(AesCtrBoringSslTest, testEncryptDecrypt_randomKey_randomMessage) {
    for (int i = 0; i < 256; i++) {
      std::string key(Random::GetRandomBytes(16));
      int iv_size = 12;
      auto res = AesCtrBoringSsl::New(key, iv_size);
      EXPECT_TRUE(res.ok()) << res.status();
      auto cipher = std::move(res.ValueOrDie());
      std::string message = Random::GetRandomBytes(i);
      auto ct = cipher->Encrypt(message);
      EXPECT_TRUE(ct.ok()) << ct.status();
      EXPECT_EQ(ct.ValueOrDie().size(), message.size() + iv_size);
      auto pt = cipher->Decrypt(ct.ValueOrDie());
      EXPECT_TRUE(pt.ok()) << pt.status();
      EXPECT_EQ(pt.ValueOrDie(), message);
    }
  }
  
  TEST(AesCtrBoringSslTest, testEncryptDecrypt_invalidIvSize) {
    std::string key(test::HexDecodeOrDie("000102030405060708090a0b0c0d0e0f"));
    int iv_size = 11;
    auto res1 = AesCtrBoringSsl::New(key, iv_size);
    EXPECT_FALSE(res1.ok()) << res1.status();
  
    iv_size = 17;
    auto res2 = AesCtrBoringSsl::New(key, iv_size);
    EXPECT_FALSE(res2.ok()) << res2.status();
  }
  
  TEST(AesCtrBoringSslTest, testNistTestVector) {
    // NIST SP 800-38A pp 55.
    std::string key(test::HexDecodeOrDie("2b7e151628aed2a6abf7158809cf4f3c"));
    std::string ciphertext(test::HexDecodeOrDie(
        "f0f1f2f3f4f5f6f7f8f9fafbfcfdfeff874d6191b620e3261bef6864990db6ce"));
    std::string message(test::HexDecodeOrDie("6bc1bee22e409f96e93d7e117393172a"));
    int iv_size = 16;
    auto res = AesCtrBoringSsl::New(key, iv_size);
    EXPECT_TRUE(res.ok()) << res.status();
    auto cipher = std::move(res.ValueOrDie());
    auto pt = cipher->Decrypt(ciphertext);
    EXPECT_TRUE(pt.ok()) << pt.status();
    EXPECT_EQ(pt.ValueOrDie(), message);
  }
  
  TEST(AesCtrBoringSslTest, testMultipleEncrypt) {
    std::string key(Random::GetRandomBytes(16));
    int iv_size = 12;
    auto res = AesCtrBoringSsl::New(key, iv_size);
    EXPECT_TRUE(res.ok()) << res.status();
    auto cipher = std::move(res.ValueOrDie());
    std::string message = "Some data to encrypt.";
    auto ct1 = cipher->Encrypt(message);
    auto ct2 = cipher->Encrypt(message);
    EXPECT_NE(ct1.ValueOrDie(), ct2.ValueOrDie());
  }
  
  }  // namespace
  }  // namespace subtle
  }  // namespace tink
  }  // namespace crypto
  
  int main(int ac, char* av[]) {
    testing::InitGoogleTest(&ac, av);
    return RUN_ALL_TESTS();
  }
  