crypto/aes_128_gcm_helpers_nss_unittest.cc - chromium/src.git - Git at Google

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 #include "crypto/aes_128_gcm_helpers_nss.h"

 #include <pk11pub.h>
 #include <secerr.h>
 #include <string>

 #include "base/logging.h"
 #include "base/rand_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "crypto/nss_util.h"
 #include "crypto/random.h"
 #include "crypto/scoped_nss_types.h"
 #include "testing/gtest/include/gtest/gtest.h"

 namespace crypto {

 namespace {

 // The AES GCM test vectors come from the gcmDecrypt128.rsp and
 // gcmEncryptExtIV128.rsp files downloaded from
 // http://csrc.nist.gov/groups/STM/cavp/index.html on 2013-02-01. The test
 // vectors in that file look like this:
 //
 // [Keylen = 128]
 // [IVlen = 96]
 // [PTlen = 0]
 // [AADlen = 0]
 // [Taglen = 128]
 //
 // Count = 0
 // Key = cf063a34d4a9a76c2c86787d3f96db71
 // IV = 113b9785971864c83b01c787
 // CT =
 // AAD =
 // Tag = 72ac8493e3a5228b5d130a69d2510e42
 // PT =
 //
 // Count = 1
 // Key = a49a5e26a2f8cb63d05546c2a62f5343
 // IV = 907763b19b9b4ab6bd4f0281
 // CT =
 // AAD =
 // Tag = a2be08210d8c470a8df6e8fbd79ec5cf
 // FAIL
 //
 // ...
 //
 // These files are huge (2.6 MB and 2.8 MB), so this file contains just a
 // selection of test vectors.

 // Describes a group of test vectors that all have a given key length, IV
 // length, plaintext length, AAD length, and tag length.
 struct TestGroupInfo {
   size_t key_len;
   size_t iv_len;
   size_t input_len;
   size_t aad_len;
   size_t tag_len;
 };

 // Each test vector consists of six strings of lowercase hexadecimal digits.
 // The strings may be empty (zero length). A test vector with a NULL |key|
 // marks the end of an array of test vectors.
 struct TestVector {
   // Input:
   const char* key;
   const char* iv;
   const char* input;
   const char* aad;
   const char* tag;

   // Expected output:
   const char* output;  // An empty string "" means decryption or encryption
                        // succeeded and the plaintext is zero-length. NULL means
                        // that the decryption or encryption failed.
 };

 const TestGroupInfo test_group_info[] = {
     {128, 96, 0, 0, 128},
     {128, 96, 0, 128, 128},
     {128, 96, 128, 0, 128},
     {128, 96, 408, 160, 128},
     {128, 96, 408, 720, 128},
     {128, 96, 104, 0, 128},
 };

 const TestVector decryption_test_group_0[] = {
     {"cf063a34d4a9a76c2c86787d3f96db71",
      "113b9785971864c83b01c787",
      "",
      "",
      "72ac8493e3a5228b5d130a69d2510e42",
      ""},
     {
      "a49a5e26a2f8cb63d05546c2a62f5343",
      "907763b19b9b4ab6bd4f0281",
      "",
      "",
      "a2be08210d8c470a8df6e8fbd79ec5cf",
      NULL  // FAIL
     },
     {NULL}};

 const TestVector decryption_test_group_1[] = {
     {
      "d1f6af919cde85661208bdce0c27cb22",
      "898c6929b435017bf031c3c5",
      "",
      "7c5faa40e636bbc91107e68010c92b9f",
      "ae45f11777540a2caeb128be8092468a",
      NULL  // FAIL
     },
     {"2370e320d4344208e0ff5683f243b213",
      "04dbb82f044d30831c441228",
      "",
      "d43a8e5089eea0d026c03a85178b27da",
      "2a049c049d25aa95969b451d93c31c6e",
      ""},
     {NULL}};

 const TestVector decryption_test_group_2[] = {
     {"e98b72a9881a84ca6b76e0f43e68647a",
      "8b23299fde174053f3d652ba",
      "5a3c1cf1985dbb8bed818036fdd5ab42",
      "",
      "23c7ab0f952b7091cd324835043b5eb5",
      "28286a321293253c3e0aa2704a278032"},
     {"33240636cd3236165f1a553b773e728e",
      "17c4d61493ecdc8f31700b12",
      "47bb7e23f7bdfe05a8091ac90e4f8b2e",
      "",
      "b723c70e931d9785f40fd4ab1d612dc9",
      "95695a5b12f2870b9cc5fdc8f218a97d"},
     {
      "5164df856f1e9cac04a79b808dc5be39",
      "e76925d5355e0584ce871b2b",
      "0216c899c88d6e32c958c7e553daa5bc",
      "",
      "a145319896329c96df291f64efbe0e3a",
      NULL  // FAIL
     },
     {NULL}};

 const TestVector decryption_test_group_3[] = {
     {"af57f42c60c0fc5a09adb81ab86ca1c3",
      "a2dc01871f37025dc0fc9a79",
      "b9a535864f48ea7b6b1367914978f9bfa087d854bb0e269bed8d279d2eea1210e48947"
      "338b22f9bad09093276a331e9c79c7f4",
      "41dc38988945fcb44faf2ef72d0061289ef8efd8",
      "4f71e72bde0018f555c5adcce062e005",
      "3803a0727eeb0ade441e0ec107161ded2d425ec0d102f21f51bf2cf9947c7ec4aa7279"
      "5b2f69b041596e8817d0a3c16f8fadeb"},
     {"ebc753e5422b377d3cb64b58ffa41b61",
      "2e1821efaced9acf1f241c9b",
      "069567190554e9ab2b50a4e1fbf9c147340a5025fdbd201929834eaf6532325899ccb9"
      "f401823e04b05817243d2142a3589878",
      "b9673412fd4f88ba0e920f46dd6438ff791d8eef",
      "534d9234d2351cf30e565de47baece0b",
      "39077edb35e9c5a4b1e4c2a6b9bb1fce77f00f5023af40333d6d699014c2bcf4209c18"
      "353a18017f5b36bfc00b1f6dcb7ed485"},
     {
      "52bdbbf9cf477f187ec010589cb39d58",
      "d3be36d3393134951d324b31",
      "700188da144fa692cf46e4a8499510a53d90903c967f7f13e8a1bd8151a74adc4fe63e"
      "32b992760b3a5f99e9a47838867000a9",
      "93c4fc6a4135f54d640b0c976bf755a06a292c33",
      "8ca4e38aa3dfa6b1d0297021ccf3ea5f",
      NULL  // FAIL
     },
     {NULL}};

 const TestVector decryption_test_group_4[] = {
     {"da2bb7d581493d692380c77105590201",
      "44aa3e7856ca279d2eb020c6",
      "9290d430c9e89c37f0446dbd620c9a6b34b1274aeb6f911f75867efcf95b6feda69f1a"
      "f4ee16c761b3c9aeac3da03aa9889c88",
      "4cd171b23bddb3a53cdf959d5c1710b481eb3785a90eb20a2345ee00d0bb7868c367ab"
      "12e6f4dd1dee72af4eee1d197777d1d6499cc541f34edbf45cda6ef90b3c024f9272d7"
      "2ec1909fb8fba7db88a4d6f7d3d925980f9f9f72",
      "9e3ac938d3eb0cadd6f5c9e35d22ba38",
      "9bbf4c1a2742f6ac80cb4e8a052e4a8f4f07c43602361355b717381edf9fabd4cb7e3a"
      "d65dbd1378b196ac270588dd0621f642"},
     {"d74e4958717a9d5c0e235b76a926cae8",
      "0b7471141e0c70b1995fd7b1",
      "e701c57d2330bf066f9ff8cf3ca4343cafe4894651cd199bdaaa681ba486b4a65c5a22"
      "b0f1420be29ea547d42c713bc6af66aa",
      "4a42b7aae8c245c6f1598a395316e4b8484dbd6e64648d5e302021b1d3fa0a38f46e22"
      "bd9c8080b863dc0016482538a8562a4bd0ba84edbe2697c76fd039527ac179ec5506cf"
      "34a6039312774cedebf4961f3978b14a26509f96",
      "e192c23cb036f0b31592989119eed55d",
      "840d9fb95e32559fb3602e48590280a172ca36d9b49ab69510f5bd552bfab7a306f85f"
      "f0a34bc305b88b804c60b90add594a17"},
     {
      "1986310c725ac94ecfe6422e75fc3ee7",
      "93ec4214fa8e6dc4e3afc775",
      "b178ec72f85a311ac4168f42a4b2c23113fbea4b85f4b9dabb74e143eb1b8b0a361e02"
      "43edfd365b90d5b325950df0ada058f9",
      "e80b88e62c49c958b5e0b8b54f532d9ff6aa84c8a40132e93e55b59fc24e8decf28463"
      "139f155d1e8ce4ee76aaeefcd245baa0fc519f83a5fb9ad9aa40c4b21126013f576c42"
      "72c2cb136c8fd091cc4539877a5d1e72d607f960",
      "8b347853f11d75e81e8a95010be81f17",
      NULL  // FAIL
     },
     {NULL}};

 const TestVector decryption_test_group_5[] = {
     {"387218b246c1a8257748b56980e50c94",
      "dd7e014198672be39f95b69d",
      "cdba9e73eaf3d38eceb2b04a8d",
      "",
      "ecf90f4a47c9c626d6fb2c765d201556",
      "48f5b426baca03064554cc2b30"},
     {"294de463721e359863887c820524b3d4",
      "3338b35c9d57a5d28190e8c9",
      "2f46634e74b8e4c89812ac83b9",
      "",
      "dabd506764e68b82a7e720aa18da0abe",
      "46a2e55c8e264df211bd112685"},
     {"28ead7fd2179e0d12aa6d5d88c58c2dc",
      "5055347f18b4d5add0ae5c41",
      "142d8210c3fb84774cdbd0447a",
      "",
      "5fd321d9cdb01952dc85f034736c2a7d",
      "3b95b981086ee73cc4d0cc1422"},
     {
      "7d7b6c988137b8d470c57bf674a09c87",
      "9edf2aa970d016ac962e1fd8",
      "a85b66c3cb5eab91d5bdc8bc0e",
      "",
      "dc054efc01f3afd21d9c2484819f569a",
      NULL  // FAIL
     },
     {NULL}};

 const TestVector encryption_test_group_0[] = {
     {"11754cd72aec309bf52f7687212e8957",
      "3c819d9a9bed087615030b65",
      "",
      "",
      "250327c674aaf477aef2675748cf6971",
      ""},
     {"ca47248ac0b6f8372a97ac43508308ed",
      "ffd2b598feabc9019262d2be",
      "",
      "",
      "60d20404af527d248d893ae495707d1a",
      ""},
     {NULL}};

 const TestVector encryption_test_group_1[] = {
     {"77be63708971c4e240d1cb79e8d77feb",
      "e0e00f19fed7ba0136a797f3",
      "",
      "7a43ec1d9c0a5a78a0b16533a6213cab",
      "209fcc8d3675ed938e9c7166709dd946",
      ""},
     {"7680c5d3ca6154758e510f4d25b98820",
      "f8f105f9c3df4965780321f8",
      "",
      "c94c410194c765e3dcc7964379758ed3",
      "94dca8edfcf90bb74b153c8d48a17930",
      ""},
     {NULL}};

 const TestVector encryption_test_group_2[] = {
     {"7fddb57453c241d03efbed3ac44e371c",
      "ee283a3fc75575e33efd4887",
      "d5de42b461646c255c87bd2962d3b9a2",
      "",
      "b36d1df9b9d5e596f83e8b7f52971cb3",
      "2ccda4a5415cb91e135c2a0f78c9b2fd"},
     {"ab72c77b97cb5fe9a382d9fe81ffdbed",
      "54cc7dc2c37ec006bcc6d1da",
      "007c5e5b3e59df24a7c355584fc1518d",
      "",
      "2b4401346697138c7a4891ee59867d0c",
      "0e1bde206a07a9c2c1b65300f8c64997"},
     {NULL}};

 const TestVector encryption_test_group_3[] = {
     {"fe47fcce5fc32665d2ae399e4eec72ba",
      "5adb9609dbaeb58cbd6e7275",
      "7c0e88c88899a779228465074797cd4c2e1498d259b54390b85e3eef1c02df60e743f1"
      "b840382c4bccaf3bafb4ca8429bea063",
      "88319d6e1d3ffa5f987199166c8a9b56c2aeba5a",
      "291ef1982e4defedaa2249f898556b47",
      "98f4826f05a265e6dd2be82db241c0fbbbf9ffb1c173aa83964b7cf539304373636525"
      "3ddbc5db8778371495da76d269e5db3e"},
     {"ec0c2ba17aa95cd6afffe949da9cc3a8",
      "296bce5b50b7d66096d627ef",
      "b85b3753535b825cbe5f632c0b843c741351f18aa484281aebec2f45bb9eea2d79d987"
      "b764b9611f6c0f8641843d5d58f3a242",
      "f8d00f05d22bf68599bcdeb131292ad6e2df5d14",
      "890147971946b627c40016da1ecf3e77",
      "a7443d31c26bdf2a1c945e29ee4bd344a99cfaf3aa71f8b3f191f83c2adfc7a0716299"
      "5506fde6309ffc19e716eddf1a828c5a"},
     {NULL}};

 const TestVector encryption_test_group_4[] = {
     {"2c1f21cf0f6fb3661943155c3e3d8492",
      "23cb5ff362e22426984d1907",
      "42f758836986954db44bf37c6ef5e4ac0adaf38f27252a1b82d02ea949c8a1a2dbc0d6"
      "8b5615ba7c1220ff6510e259f06655d8",
      "5d3624879d35e46849953e45a32a624d6a6c536ed9857c613b572b0333e701557a713e"
      "3f010ecdf9a6bd6c9e3e44b065208645aff4aabee611b391528514170084ccf587177f"
      "4488f33cfb5e979e42b6e1cfc0a60238982a7aec",
      "57a3ee28136e94c74838997ae9823f3a",
      "81824f0e0d523db30d3da369fdc0d60894c7a0a20646dd015073ad2732bd989b14a222"
      "b6ad57af43e1895df9dca2a5344a62cc"},
     {"d9f7d2411091f947b4d6f1e2d1f0fb2e",
      "e1934f5db57cc983e6b180e7",
      "73ed042327f70fe9c572a61545eda8b2a0c6e1d6c291ef19248e973aee6c312012f490"
      "c2c6f6166f4a59431e182663fcaea05a",
      "0a8a18a7150e940c3d87b38e73baee9a5c049ee21795663e264b694a949822b639092d"
      "0e67015e86363583fcf0ca645af9f43375f05fdb4ce84f411dcbca73c2220dea03a201"
      "15d2e51398344b16bee1ed7c499b353d6c597af8",
      "21b51ca862cb637cdd03b99a0f93b134",
      "aaadbd5c92e9151ce3db7210b8714126b73e43436d242677afa50384f2149b831f1d57"
      "3c7891c2a91fbc48db29967ec9542b23"},
     {NULL}};

 const TestVector encryption_test_group_5[] = {
     {"fe9bb47deb3a61e423c2231841cfd1fb",
      "4d328eb776f500a2f7fb47aa",
      "f1cc3818e421876bb6b8bbd6c9",
      "",
      "43fd4727fe5cdb4b5b42818dea7ef8c9",
      "b88c5c1977b35b517b0aeae967"},
     {"6703df3701a7f54911ca72e24dca046a",
      "12823ab601c350ea4bc2488c",
      "793cd125b0b84a043e3ac67717",
      "",
      "38e6bcd29962e5f2c13626b85a877101",
      "b2051c80014f42f08735a7b0cd"},
     {NULL}};

 const TestVector* const decryption_test_group_array[] = {
     decryption_test_group_0,
     decryption_test_group_1,
     decryption_test_group_2,
     decryption_test_group_3,
     decryption_test_group_4,
     decryption_test_group_5,
 };

 const TestVector* const encryption_test_group_array[] = {
     encryption_test_group_0,
     encryption_test_group_1,
     encryption_test_group_2,
     encryption_test_group_3,
     encryption_test_group_4,
     encryption_test_group_5,
 };

 bool DecodeHexString(const base::StringPiece& hex, std::string* bytes) {
   bytes->clear();
   if (hex.empty())
     return true;
   std::vector<uint8> v;
   if (!base::HexStringToBytes(hex.as_string(), &v))
     return false;
   if (!v.empty())
     bytes->assign(reinterpret_cast<const char*>(&v[0]), v.size());
   return true;
 }

 class Aes128GcmHelpersTest : public ::testing::Test {
  public:
   enum Mode { DECRYPT, ENCRYPT };

   void SetUp() override { EnsureNSSInit(); }

   bool DecryptOrEncrypt(Mode mode,
                         const base::StringPiece& input,
                         const base::StringPiece& key,
                         const base::StringPiece& nonce,
                         const base::StringPiece& aad,
                         size_t auth_tag_size,
                         std::string* output) {
     DCHECK(output);

     const CK_ATTRIBUTE_TYPE cka_mode =
         mode == DECRYPT ? CKA_DECRYPT : CKA_ENCRYPT;

     SECItem key_item;
     key_item.type = siBuffer;
     key_item.data = const_cast<unsigned char*>(
         reinterpret_cast<const unsigned char*>(key.data()));
     key_item.len = key.size();

     crypto::ScopedPK11Slot slot(PK11_GetInternalSlot());
     DCHECK(slot);

     crypto::ScopedPK11SymKey aead_key(
         PK11_ImportSymKey(slot.get(), CKM_AES_GCM, PK11_OriginUnwrap, cka_mode,
                           &key_item, nullptr));

     CK_GCM_PARAMS gcm_params;
     gcm_params.pIv = const_cast<unsigned char*>(
         reinterpret_cast<const unsigned char*>(nonce.data()));
     gcm_params.ulIvLen = nonce.size();

     gcm_params.pAAD = const_cast<unsigned char*>(
         reinterpret_cast<const unsigned char*>(aad.data()));

     gcm_params.ulAADLen = aad.size();

     gcm_params.ulTagBits = auth_tag_size * 8;

     SECItem param;
     param.type = siBuffer;
     param.data = reinterpret_cast<unsigned char*>(&gcm_params);
     param.len = sizeof(CK_GCM_PARAMS);

     size_t maximum_output_length = input.size();
     if (mode == ENCRYPT)
       maximum_output_length += auth_tag_size;

     unsigned int output_length = 0;
     unsigned char* raw_input = const_cast<unsigned char*>(
         reinterpret_cast<const unsigned char*>(input.data()));
     unsigned char* raw_output = reinterpret_cast<unsigned char*>(
         base::WriteInto(output, maximum_output_length + 1 /* null */));

     PK11Helper_TransformFunction* transform_function =
         mode == DECRYPT ? PK11DecryptHelper : PK11EncryptHelper;

     const SECStatus result = transform_function(
         aead_key.get(), CKM_AES_GCM, &param, raw_output, &output_length,
         maximum_output_length, raw_input, input.size());

     if (result != SECSuccess)
       return false;

     const size_t expected_output_length = mode == DECRYPT
                                               ? input.size() - auth_tag_size
                                               : input.size() + auth_tag_size;

     EXPECT_EQ(expected_output_length, output_length);

     output->resize(expected_output_length);
     return true;
   }

  private:
   // The prototype of PK11_Decrypt and PK11_Encrypt.
   using PK11Helper_TransformFunction = SECStatus(PK11SymKey* symKey,
                                                  CK_MECHANISM_TYPE mechanism,
                                                  SECItem* param,
                                                  unsigned char* out,
                                                  unsigned int* outLen,
                                                  unsigned int maxLen,
                                                  const unsigned char* data,
                                                  unsigned int dataLen);
 };

 }  // namespace

 TEST_F(Aes128GcmHelpersTest, RoundTrip) {
   const std::string message = "Hello, world!";

   const size_t kKeySize = 16;
   const size_t kNonceSize = 16;

   std::string key, nonce;
   RandBytes(base::WriteInto(&key, kKeySize + 1), kKeySize);
   RandBytes(base::WriteInto(&nonce, kNonceSize + 1), kNonceSize);

   // AEAD_AES_128_GCM is defined with a default authentication tag size of 16,
   // but RFC 5282 extends this to authentication tag sizes of 8 and 12 as well.
   size_t auth_tag_size = base::RandInt(2, 4) * 4;

   std::string encrypted;
   ASSERT_TRUE(DecryptOrEncrypt(ENCRYPT, message, key, nonce,
                                base::StringPiece(), auth_tag_size, &encrypted));

   std::string decrypted;
   ASSERT_TRUE(DecryptOrEncrypt(DECRYPT, encrypted, key, nonce,
                                base::StringPiece(), auth_tag_size, &decrypted));

   EXPECT_EQ(message, decrypted);
 }

 TEST_F(Aes128GcmHelpersTest, DecryptionVectors) {
   for (size_t i = 0; i < arraysize(decryption_test_group_array); i++) {
     SCOPED_TRACE(i);
     const TestVector* test_vectors = decryption_test_group_array[i];
     const TestGroupInfo& test_info = test_group_info[i];

     for (size_t j = 0; test_vectors[j].key != nullptr; j++) {
       // If not present then decryption is expected to fail.
       bool has_output = test_vectors[j].output;

       // Decode the test vector.
       std::string key, iv, input, aad, tag, expected_output;
       ASSERT_TRUE(DecodeHexString(test_vectors[j].key, &key));
       ASSERT_TRUE(DecodeHexString(test_vectors[j].iv, &iv));
       ASSERT_TRUE(DecodeHexString(test_vectors[j].input, &input));
       ASSERT_TRUE(DecodeHexString(test_vectors[j].aad, &aad));
       ASSERT_TRUE(DecodeHexString(test_vectors[j].tag, &tag));
       if (has_output)
         ASSERT_TRUE(DecodeHexString(test_vectors[j].output, &expected_output));

       // The test vector's lengths should look sane. Note that the lengths
       // in |test_info| are in bits.
       EXPECT_EQ(test_info.key_len, key.length() * 8);
       EXPECT_EQ(test_info.iv_len, iv.length() * 8);
       EXPECT_EQ(test_info.input_len, input.length() * 8);
       EXPECT_EQ(test_info.aad_len, aad.length() * 8);
       EXPECT_EQ(test_info.tag_len, tag.length() * 8);
       if (has_output)
         EXPECT_EQ(test_info.input_len, expected_output.length() * 8);

       const std::string ciphertext = input + tag;
       std::string output;

       if (!DecryptOrEncrypt(DECRYPT, ciphertext, key, iv, aad, tag.length(),
                             &output)) {
         EXPECT_FALSE(has_output);
         continue;
       }

       EXPECT_TRUE(has_output);
       EXPECT_EQ(expected_output, output);
     }
   }
 }

 TEST_F(Aes128GcmHelpersTest, EncryptionVectors) {
   for (size_t i = 0; i < arraysize(encryption_test_group_array); i++) {
     SCOPED_TRACE(i);
     const TestVector* test_vectors = encryption_test_group_array[i];
     const TestGroupInfo& test_info = test_group_info[i];

     for (size_t j = 0; test_vectors[j].key != nullptr; j++) {
       // If not present then decryption is expected to fail.
       bool has_output = test_vectors[j].output;

       // Decode the test vector.
       std::string key, iv, input, aad, tag, expected_output;
       ASSERT_TRUE(DecodeHexString(test_vectors[j].key, &key));
       ASSERT_TRUE(DecodeHexString(test_vectors[j].iv, &iv));
       ASSERT_TRUE(DecodeHexString(test_vectors[j].input, &input));
       ASSERT_TRUE(DecodeHexString(test_vectors[j].aad, &aad));
       ASSERT_TRUE(DecodeHexString(test_vectors[j].tag, &tag));
       if (has_output)
         ASSERT_TRUE(DecodeHexString(test_vectors[j].output, &expected_output));

       // The test vector's lengths should look sane. Note that the lengths
       // in |test_info| are in bits.
       EXPECT_EQ(test_info.key_len, key.length() * 8);
       EXPECT_EQ(test_info.iv_len, iv.length() * 8);
       EXPECT_EQ(test_info.input_len, input.length() * 8);
       EXPECT_EQ(test_info.aad_len, aad.length() * 8);
       EXPECT_EQ(test_info.tag_len, tag.length() * 8);
       if (has_output)
         EXPECT_EQ(test_info.input_len, expected_output.length() * 8);

       std::string output;

       if (!DecryptOrEncrypt(ENCRYPT, input, key, iv, aad, tag.length(),
                             &output)) {
         EXPECT_FALSE(has_output);
         continue;
       }

       const std::string expected_output_with_tag = expected_output + tag;

       EXPECT_TRUE(has_output);
       EXPECT_EQ(expected_output_with_tag, output);
     }
   }
 }

 }  // namespace crypto
	// Copyright 2015 The Chromium Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	#include "crypto/aes_128_gcm_helpers_nss.h"

	#include <pk11pub.h>
	#include <secerr.h>
	#include <string>

	#include "base/logging.h"
	#include "base/rand_util.h"
	#include "base/strings/string_number_conversions.h"
	#include "base/strings/string_util.h"
	#include "crypto/nss_util.h"
	#include "crypto/random.h"
	#include "crypto/scoped_nss_types.h"
	#include "testing/gtest/include/gtest/gtest.h"

	namespace crypto {

	namespace {

	// The AES GCM test vectors come from the gcmDecrypt128.rsp and
	// gcmEncryptExtIV128.rsp files downloaded from
	// http://csrc.nist.gov/groups/STM/cavp/index.html on 2013-02-01. The test
	// vectors in that file look like this:
	//
	// [Keylen = 128]
	// [IVlen = 96]
	// [PTlen = 0]
	// [AADlen = 0]
	// [Taglen = 128]
	//
	// Count = 0
	// Key = cf063a34d4a9a76c2c86787d3f96db71
	// IV = 113b9785971864c83b01c787
	// CT =
	// AAD =
	// Tag = 72ac8493e3a5228b5d130a69d2510e42
	// PT =
	//
	// Count = 1
	// Key = a49a5e26a2f8cb63d05546c2a62f5343
	// IV = 907763b19b9b4ab6bd4f0281
	// CT =
	// AAD =
	// Tag = a2be08210d8c470a8df6e8fbd79ec5cf
	// FAIL
	//
	// ...
	//
	// These files are huge (2.6 MB and 2.8 MB), so this file contains just a
	// selection of test vectors.

	// Describes a group of test vectors that all have a given key length, IV
	// length, plaintext length, AAD length, and tag length.
	struct TestGroupInfo {
	size_t key_len;
	size_t iv_len;
	size_t input_len;
	size_t aad_len;
	size_t tag_len;
	};

	// Each test vector consists of six strings of lowercase hexadecimal digits.
	// The strings may be empty (zero length). A test vector with a NULL \|key\|
	// marks the end of an array of test vectors.
	struct TestVector {
	// Input:
	const char* key;
	const char* iv;
	const char* input;
	const char* aad;
	const char* tag;

	// Expected output:
	const char* output; // An empty string "" means decryption or encryption
	// succeeded and the plaintext is zero-length. NULL means
	// that the decryption or encryption failed.
	};

	const TestGroupInfo test_group_info[] = {
	{128, 96, 0, 0, 128},
	{128, 96, 0, 128, 128},
	{128, 96, 128, 0, 128},
	{128, 96, 408, 160, 128},
	{128, 96, 408, 720, 128},
	{128, 96, 104, 0, 128},
	};

	const TestVector decryption_test_group_0[] = {
	{"cf063a34d4a9a76c2c86787d3f96db71",
	"113b9785971864c83b01c787",
	"",
	"",
	"72ac8493e3a5228b5d130a69d2510e42",
	""},
	{
	"a49a5e26a2f8cb63d05546c2a62f5343",
	"907763b19b9b4ab6bd4f0281",
	"",
	"",
	"a2be08210d8c470a8df6e8fbd79ec5cf",
	NULL // FAIL
	},
	{NULL}};

	const TestVector decryption_test_group_1[] = {
	{
	"d1f6af919cde85661208bdce0c27cb22",
	"898c6929b435017bf031c3c5",
	"",
	"7c5faa40e636bbc91107e68010c92b9f",
	"ae45f11777540a2caeb128be8092468a",
	NULL // FAIL
	},
	{"2370e320d4344208e0ff5683f243b213",
	"04dbb82f044d30831c441228",
	"",
	"d43a8e5089eea0d026c03a85178b27da",
	"2a049c049d25aa95969b451d93c31c6e",
	""},
	{NULL}};

	const TestVector decryption_test_group_2[] = {
	{"e98b72a9881a84ca6b76e0f43e68647a",
	"8b23299fde174053f3d652ba",
	"5a3c1cf1985dbb8bed818036fdd5ab42",
	"",
	"23c7ab0f952b7091cd324835043b5eb5",
	"28286a321293253c3e0aa2704a278032"},
	{"33240636cd3236165f1a553b773e728e",
	"17c4d61493ecdc8f31700b12",
	"47bb7e23f7bdfe05a8091ac90e4f8b2e",
	"",
	"b723c70e931d9785f40fd4ab1d612dc9",
	"95695a5b12f2870b9cc5fdc8f218a97d"},
	{
	"5164df856f1e9cac04a79b808dc5be39",
	"e76925d5355e0584ce871b2b",
	"0216c899c88d6e32c958c7e553daa5bc",
	"",
	"a145319896329c96df291f64efbe0e3a",
	NULL // FAIL
	},
	{NULL}};

	const TestVector decryption_test_group_3[] = {
	{"af57f42c60c0fc5a09adb81ab86ca1c3",
	"a2dc01871f37025dc0fc9a79",
	"b9a535864f48ea7b6b1367914978f9bfa087d854bb0e269bed8d279d2eea1210e48947"
	"338b22f9bad09093276a331e9c79c7f4",
	"41dc38988945fcb44faf2ef72d0061289ef8efd8",
	"4f71e72bde0018f555c5adcce062e005",
	"3803a0727eeb0ade441e0ec107161ded2d425ec0d102f21f51bf2cf9947c7ec4aa7279"
	"5b2f69b041596e8817d0a3c16f8fadeb"},
	{"ebc753e5422b377d3cb64b58ffa41b61",
	"2e1821efaced9acf1f241c9b",
	"069567190554e9ab2b50a4e1fbf9c147340a5025fdbd201929834eaf6532325899ccb9"
	"f401823e04b05817243d2142a3589878",
	"b9673412fd4f88ba0e920f46dd6438ff791d8eef",
	"534d9234d2351cf30e565de47baece0b",
	"39077edb35e9c5a4b1e4c2a6b9bb1fce77f00f5023af40333d6d699014c2bcf4209c18"
	"353a18017f5b36bfc00b1f6dcb7ed485"},
	{
	"52bdbbf9cf477f187ec010589cb39d58",
	"d3be36d3393134951d324b31",
	"700188da144fa692cf46e4a8499510a53d90903c967f7f13e8a1bd8151a74adc4fe63e"
	"32b992760b3a5f99e9a47838867000a9",
	"93c4fc6a4135f54d640b0c976bf755a06a292c33",
	"8ca4e38aa3dfa6b1d0297021ccf3ea5f",
	NULL // FAIL
	},
	{NULL}};

	const TestVector decryption_test_group_4[] = {
	{"da2bb7d581493d692380c77105590201",
	"44aa3e7856ca279d2eb020c6",
	"9290d430c9e89c37f0446dbd620c9a6b34b1274aeb6f911f75867efcf95b6feda69f1a"
	"f4ee16c761b3c9aeac3da03aa9889c88",
	"4cd171b23bddb3a53cdf959d5c1710b481eb3785a90eb20a2345ee00d0bb7868c367ab"
	"12e6f4dd1dee72af4eee1d197777d1d6499cc541f34edbf45cda6ef90b3c024f9272d7"
	"2ec1909fb8fba7db88a4d6f7d3d925980f9f9f72",
	"9e3ac938d3eb0cadd6f5c9e35d22ba38",
	"9bbf4c1a2742f6ac80cb4e8a052e4a8f4f07c43602361355b717381edf9fabd4cb7e3a"
	"d65dbd1378b196ac270588dd0621f642"},
	{"d74e4958717a9d5c0e235b76a926cae8",
	"0b7471141e0c70b1995fd7b1",
	"e701c57d2330bf066f9ff8cf3ca4343cafe4894651cd199bdaaa681ba486b4a65c5a22"
	"b0f1420be29ea547d42c713bc6af66aa",
	"4a42b7aae8c245c6f1598a395316e4b8484dbd6e64648d5e302021b1d3fa0a38f46e22"
	"bd9c8080b863dc0016482538a8562a4bd0ba84edbe2697c76fd039527ac179ec5506cf"
	"34a6039312774cedebf4961f3978b14a26509f96",
	"e192c23cb036f0b31592989119eed55d",
	"840d9fb95e32559fb3602e48590280a172ca36d9b49ab69510f5bd552bfab7a306f85f"
	"f0a34bc305b88b804c60b90add594a17"},
	{
	"1986310c725ac94ecfe6422e75fc3ee7",
	"93ec4214fa8e6dc4e3afc775",
	"b178ec72f85a311ac4168f42a4b2c23113fbea4b85f4b9dabb74e143eb1b8b0a361e02"
	"43edfd365b90d5b325950df0ada058f9",
	"e80b88e62c49c958b5e0b8b54f532d9ff6aa84c8a40132e93e55b59fc24e8decf28463"
	"139f155d1e8ce4ee76aaeefcd245baa0fc519f83a5fb9ad9aa40c4b21126013f576c42"
	"72c2cb136c8fd091cc4539877a5d1e72d607f960",
	"8b347853f11d75e81e8a95010be81f17",
	NULL // FAIL
	},
	{NULL}};

	const TestVector decryption_test_group_5[] = {
	{"387218b246c1a8257748b56980e50c94",
	"dd7e014198672be39f95b69d",
	"cdba9e73eaf3d38eceb2b04a8d",
	"",
	"ecf90f4a47c9c626d6fb2c765d201556",
	"48f5b426baca03064554cc2b30"},
	{"294de463721e359863887c820524b3d4",
	"3338b35c9d57a5d28190e8c9",
	"2f46634e74b8e4c89812ac83b9",
	"",
	"dabd506764e68b82a7e720aa18da0abe",
	"46a2e55c8e264df211bd112685"},
	{"28ead7fd2179e0d12aa6d5d88c58c2dc",
	"5055347f18b4d5add0ae5c41",
	"142d8210c3fb84774cdbd0447a",
	"",
	"5fd321d9cdb01952dc85f034736c2a7d",
	"3b95b981086ee73cc4d0cc1422"},
	{
	"7d7b6c988137b8d470c57bf674a09c87",
	"9edf2aa970d016ac962e1fd8",
	"a85b66c3cb5eab91d5bdc8bc0e",
	"",
	"dc054efc01f3afd21d9c2484819f569a",
	NULL // FAIL
	},
	{NULL}};

	const TestVector encryption_test_group_0[] = {
	{"11754cd72aec309bf52f7687212e8957",
	"3c819d9a9bed087615030b65",
	"",
	"",
	"250327c674aaf477aef2675748cf6971",
	""},
	{"ca47248ac0b6f8372a97ac43508308ed",
	"ffd2b598feabc9019262d2be",
	"",
	"",
	"60d20404af527d248d893ae495707d1a",
	""},
	{NULL}};

	const TestVector encryption_test_group_1[] = {
	{"77be63708971c4e240d1cb79e8d77feb",
	"e0e00f19fed7ba0136a797f3",
	"",
	"7a43ec1d9c0a5a78a0b16533a6213cab",
	"209fcc8d3675ed938e9c7166709dd946",
	""},
	{"7680c5d3ca6154758e510f4d25b98820",
	"f8f105f9c3df4965780321f8",
	"",
	"c94c410194c765e3dcc7964379758ed3",
	"94dca8edfcf90bb74b153c8d48a17930",
	""},
	{NULL}};

	const TestVector encryption_test_group_2[] = {
	{"7fddb57453c241d03efbed3ac44e371c",
	"ee283a3fc75575e33efd4887",
	"d5de42b461646c255c87bd2962d3b9a2",
	"",
	"b36d1df9b9d5e596f83e8b7f52971cb3",
	"2ccda4a5415cb91e135c2a0f78c9b2fd"},
	{"ab72c77b97cb5fe9a382d9fe81ffdbed",
	"54cc7dc2c37ec006bcc6d1da",
	"007c5e5b3e59df24a7c355584fc1518d",
	"",
	"2b4401346697138c7a4891ee59867d0c",
	"0e1bde206a07a9c2c1b65300f8c64997"},
	{NULL}};

	const TestVector encryption_test_group_3[] = {
	{"fe47fcce5fc32665d2ae399e4eec72ba",
	"5adb9609dbaeb58cbd6e7275",
	"7c0e88c88899a779228465074797cd4c2e1498d259b54390b85e3eef1c02df60e743f1"
	"b840382c4bccaf3bafb4ca8429bea063",
	"88319d6e1d3ffa5f987199166c8a9b56c2aeba5a",
	"291ef1982e4defedaa2249f898556b47",
	"98f4826f05a265e6dd2be82db241c0fbbbf9ffb1c173aa83964b7cf539304373636525"
	"3ddbc5db8778371495da76d269e5db3e"},
	{"ec0c2ba17aa95cd6afffe949da9cc3a8",
	"296bce5b50b7d66096d627ef",
	"b85b3753535b825cbe5f632c0b843c741351f18aa484281aebec2f45bb9eea2d79d987"
	"b764b9611f6c0f8641843d5d58f3a242",
	"f8d00f05d22bf68599bcdeb131292ad6e2df5d14",
	"890147971946b627c40016da1ecf3e77",
	"a7443d31c26bdf2a1c945e29ee4bd344a99cfaf3aa71f8b3f191f83c2adfc7a0716299"
	"5506fde6309ffc19e716eddf1a828c5a"},
	{NULL}};

	const TestVector encryption_test_group_4[] = {
	{"2c1f21cf0f6fb3661943155c3e3d8492",
	"23cb5ff362e22426984d1907",
	"42f758836986954db44bf37c6ef5e4ac0adaf38f27252a1b82d02ea949c8a1a2dbc0d6"
	"8b5615ba7c1220ff6510e259f06655d8",
	"5d3624879d35e46849953e45a32a624d6a6c536ed9857c613b572b0333e701557a713e"
	"3f010ecdf9a6bd6c9e3e44b065208645aff4aabee611b391528514170084ccf587177f"
	"4488f33cfb5e979e42b6e1cfc0a60238982a7aec",
	"57a3ee28136e94c74838997ae9823f3a",
	"81824f0e0d523db30d3da369fdc0d60894c7a0a20646dd015073ad2732bd989b14a222"
	"b6ad57af43e1895df9dca2a5344a62cc"},
	{"d9f7d2411091f947b4d6f1e2d1f0fb2e",
	"e1934f5db57cc983e6b180e7",
	"73ed042327f70fe9c572a61545eda8b2a0c6e1d6c291ef19248e973aee6c312012f490"
	"c2c6f6166f4a59431e182663fcaea05a",
	"0a8a18a7150e940c3d87b38e73baee9a5c049ee21795663e264b694a949822b639092d"
	"0e67015e86363583fcf0ca645af9f43375f05fdb4ce84f411dcbca73c2220dea03a201"
	"15d2e51398344b16bee1ed7c499b353d6c597af8",
	"21b51ca862cb637cdd03b99a0f93b134",
	"aaadbd5c92e9151ce3db7210b8714126b73e43436d242677afa50384f2149b831f1d57"
	"3c7891c2a91fbc48db29967ec9542b23"},
	{NULL}};

	const TestVector encryption_test_group_5[] = {
	{"fe9bb47deb3a61e423c2231841cfd1fb",
	"4d328eb776f500a2f7fb47aa",
	"f1cc3818e421876bb6b8bbd6c9",
	"",
	"43fd4727fe5cdb4b5b42818dea7ef8c9",
	"b88c5c1977b35b517b0aeae967"},
	{"6703df3701a7f54911ca72e24dca046a",
	"12823ab601c350ea4bc2488c",
	"793cd125b0b84a043e3ac67717",
	"",
	"38e6bcd29962e5f2c13626b85a877101",
	"b2051c80014f42f08735a7b0cd"},
	{NULL}};

	const TestVector* const decryption_test_group_array[] = {
	decryption_test_group_0,
	decryption_test_group_1,
	decryption_test_group_2,
	decryption_test_group_3,
	decryption_test_group_4,
	decryption_test_group_5,
	};

	const TestVector* const encryption_test_group_array[] = {
	encryption_test_group_0,
	encryption_test_group_1,
	encryption_test_group_2,
	encryption_test_group_3,
	encryption_test_group_4,
	encryption_test_group_5,
	};

	bool DecodeHexString(const base::StringPiece& hex, std::string* bytes) {
	bytes->clear();
	if (hex.empty())
	return true;
	std::vector<uint8> v;
	if (!base::HexStringToBytes(hex.as_string(), &v))
	return false;
	if (!v.empty())
	bytes->assign(reinterpret_cast<const char*>(&v[0]), v.size());
	return true;
	}

	class Aes128GcmHelpersTest : public ::testing::Test {
	public:
	enum Mode { DECRYPT, ENCRYPT };

	void SetUp() override { EnsureNSSInit(); }

	bool DecryptOrEncrypt(Mode mode,
	const base::StringPiece& input,
	const base::StringPiece& key,
	const base::StringPiece& nonce,
	const base::StringPiece& aad,
	size_t auth_tag_size,
	std::string* output) {
	DCHECK(output);

	const CK_ATTRIBUTE_TYPE cka_mode =
	mode == DECRYPT ? CKA_DECRYPT : CKA_ENCRYPT;

	SECItem key_item;
	key_item.type = siBuffer;
	key_item.data = const_cast<unsigned char*>(
	reinterpret_cast<const unsigned char*>(key.data()));
	key_item.len = key.size();

	crypto::ScopedPK11Slot slot(PK11_GetInternalSlot());
	DCHECK(slot);

	crypto::ScopedPK11SymKey aead_key(
	PK11_ImportSymKey(slot.get(), CKM_AES_GCM, PK11_OriginUnwrap, cka_mode,
	&key_item, nullptr));

	CK_GCM_PARAMS gcm_params;
	gcm_params.pIv = const_cast<unsigned char*>(
	reinterpret_cast<const unsigned char*>(nonce.data()));
	gcm_params.ulIvLen = nonce.size();

	gcm_params.pAAD = const_cast<unsigned char*>(
	reinterpret_cast<const unsigned char*>(aad.data()));

	gcm_params.ulAADLen = aad.size();

	gcm_params.ulTagBits = auth_tag_size * 8;

	SECItem param;
	param.type = siBuffer;
	param.data = reinterpret_cast<unsigned char*>(&gcm_params);
	param.len = sizeof(CK_GCM_PARAMS);

	size_t maximum_output_length = input.size();
	if (mode == ENCRYPT)
	maximum_output_length += auth_tag_size;

	unsigned int output_length = 0;
	unsigned char* raw_input = const_cast<unsigned char*>(
	reinterpret_cast<const unsigned char*>(input.data()));
	unsigned char* raw_output = reinterpret_cast<unsigned char*>(
	base::WriteInto(output, maximum_output_length + 1 /* null */));

	PK11Helper_TransformFunction* transform_function =
	mode == DECRYPT ? PK11DecryptHelper : PK11EncryptHelper;

	const SECStatus result = transform_function(
	aead_key.get(), CKM_AES_GCM, &param, raw_output, &output_length,
	maximum_output_length, raw_input, input.size());

	if (result != SECSuccess)
	return false;

	const size_t expected_output_length = mode == DECRYPT
	? input.size() - auth_tag_size
	: input.size() + auth_tag_size;

	EXPECT_EQ(expected_output_length, output_length);

	output->resize(expected_output_length);
	return true;
	}

	private:
	// The prototype of PK11_Decrypt and PK11_Encrypt.
	using PK11Helper_TransformFunction = SECStatus(PK11SymKey* symKey,
	CK_MECHANISM_TYPE mechanism,
	SECItem* param,
	unsigned char* out,
	unsigned int* outLen,
	unsigned int maxLen,
	const unsigned char* data,
	unsigned int dataLen);
	};

	} // namespace

	TEST_F(Aes128GcmHelpersTest, RoundTrip) {
	const std::string message = "Hello, world!";

	const size_t kKeySize = 16;
	const size_t kNonceSize = 16;

	std::string key, nonce;
	RandBytes(base::WriteInto(&key, kKeySize + 1), kKeySize);
	RandBytes(base::WriteInto(&nonce, kNonceSize + 1), kNonceSize);

	// AEAD_AES_128_GCM is defined with a default authentication tag size of 16,
	// but RFC 5282 extends this to authentication tag sizes of 8 and 12 as well.
	size_t auth_tag_size = base::RandInt(2, 4) * 4;

	std::string encrypted;
	ASSERT_TRUE(DecryptOrEncrypt(ENCRYPT, message, key, nonce,
	base::StringPiece(), auth_tag_size, &encrypted));

	std::string decrypted;
	ASSERT_TRUE(DecryptOrEncrypt(DECRYPT, encrypted, key, nonce,
	base::StringPiece(), auth_tag_size, &decrypted));

	EXPECT_EQ(message, decrypted);
	}

	TEST_F(Aes128GcmHelpersTest, DecryptionVectors) {
	for (size_t i = 0; i < arraysize(decryption_test_group_array); i++) {
	SCOPED_TRACE(i);
	const TestVector* test_vectors = decryption_test_group_array[i];
	const TestGroupInfo& test_info = test_group_info[i];

	for (size_t j = 0; test_vectors[j].key != nullptr; j++) {
	// If not present then decryption is expected to fail.
	bool has_output = test_vectors[j].output;

	// Decode the test vector.
	std::string key, iv, input, aad, tag, expected_output;
	ASSERT_TRUE(DecodeHexString(test_vectors[j].key, &key));
	ASSERT_TRUE(DecodeHexString(test_vectors[j].iv, &iv));
	ASSERT_TRUE(DecodeHexString(test_vectors[j].input, &input));
	ASSERT_TRUE(DecodeHexString(test_vectors[j].aad, &aad));
	ASSERT_TRUE(DecodeHexString(test_vectors[j].tag, &tag));
	if (has_output)
	ASSERT_TRUE(DecodeHexString(test_vectors[j].output, &expected_output));

	// The test vector's lengths should look sane. Note that the lengths
	// in \|test_info\| are in bits.
	EXPECT_EQ(test_info.key_len, key.length() * 8);
	EXPECT_EQ(test_info.iv_len, iv.length() * 8);
	EXPECT_EQ(test_info.input_len, input.length() * 8);
	EXPECT_EQ(test_info.aad_len, aad.length() * 8);
	EXPECT_EQ(test_info.tag_len, tag.length() * 8);
	if (has_output)
	EXPECT_EQ(test_info.input_len, expected_output.length() * 8);

	const std::string ciphertext = input + tag;
	std::string output;

	if (!DecryptOrEncrypt(DECRYPT, ciphertext, key, iv, aad, tag.length(),
	&output)) {
	EXPECT_FALSE(has_output);
	continue;
	}

	EXPECT_TRUE(has_output);
	EXPECT_EQ(expected_output, output);
	}
	}
	}

	TEST_F(Aes128GcmHelpersTest, EncryptionVectors) {
	for (size_t i = 0; i < arraysize(encryption_test_group_array); i++) {
	SCOPED_TRACE(i);
	const TestVector* test_vectors = encryption_test_group_array[i];
	const TestGroupInfo& test_info = test_group_info[i];

	for (size_t j = 0; test_vectors[j].key != nullptr; j++) {
	// If not present then decryption is expected to fail.
	bool has_output = test_vectors[j].output;

	// Decode the test vector.
	std::string key, iv, input, aad, tag, expected_output;
	ASSERT_TRUE(DecodeHexString(test_vectors[j].key, &key));
	ASSERT_TRUE(DecodeHexString(test_vectors[j].iv, &iv));
	ASSERT_TRUE(DecodeHexString(test_vectors[j].input, &input));
	ASSERT_TRUE(DecodeHexString(test_vectors[j].aad, &aad));
	ASSERT_TRUE(DecodeHexString(test_vectors[j].tag, &tag));
	if (has_output)
	ASSERT_TRUE(DecodeHexString(test_vectors[j].output, &expected_output));

	// The test vector's lengths should look sane. Note that the lengths
	// in \|test_info\| are in bits.
	EXPECT_EQ(test_info.key_len, key.length() * 8);
	EXPECT_EQ(test_info.iv_len, iv.length() * 8);
	EXPECT_EQ(test_info.input_len, input.length() * 8);
	EXPECT_EQ(test_info.aad_len, aad.length() * 8);
	EXPECT_EQ(test_info.tag_len, tag.length() * 8);
	if (has_output)
	EXPECT_EQ(test_info.input_len, expected_output.length() * 8);

	std::string output;

	if (!DecryptOrEncrypt(ENCRYPT, input, key, iv, aad, tag.length(),
	&output)) {
	EXPECT_FALSE(has_output);
	continue;
	}

	const std::string expected_output_with_tag = expected_output + tag;

	EXPECT_TRUE(has_output);
	EXPECT_EQ(expected_output_with_tag, output);
	}
	}
	}

	} // namespace crypto