path: root/chromium/components/webcrypto/algorithms/hmac_unittest.cc

// Copyright 2014 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 <limits.h>
#include <stddef.h>
#include <stdint.h>

#include "base/logging.h"
#include "base/values.h"
#include "components/webcrypto/algorithm_dispatch.h"
#include "components/webcrypto/algorithms/test_helpers.h"
#include "components/webcrypto/crypto_data.h"
#include "components/webcrypto/status.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/WebKit/public/platform/WebCryptoAlgorithmParams.h"
#include "third_party/WebKit/public/platform/WebCryptoKeyAlgorithm.h"

namespace webcrypto {

namespace {

// Creates an HMAC algorithm whose parameters struct is compatible with key
// generation. It is an error to call this with a hash_id that is not a SHA*.
// The key_length_bits parameter is optional, with zero meaning unspecified.
blink::WebCryptoAlgorithm CreateHmacKeyGenAlgorithm(
    blink::WebCryptoAlgorithmId hash_id,
    unsigned int key_length_bits) {
  DCHECK(blink::WebCryptoAlgorithm::IsHash(hash_id));
  // key_length_bytes == 0 means unspecified
  return blink::WebCryptoAlgorithm::AdoptParamsAndCreate(
      blink::kWebCryptoAlgorithmIdHmac,
      new blink::WebCryptoHmacKeyGenParams(
          CreateAlgorithm(hash_id), (key_length_bits != 0), key_length_bits));
}

blink::WebCryptoAlgorithm CreateHmacImportAlgorithmWithLength(
    blink::WebCryptoAlgorithmId hash_id,
    unsigned int length_bits) {
  DCHECK(blink::WebCryptoAlgorithm::IsHash(hash_id));
  return blink::WebCryptoAlgorithm::AdoptParamsAndCreate(
      blink::kWebCryptoAlgorithmIdHmac,
      new blink::WebCryptoHmacImportParams(CreateAlgorithm(hash_id), true,
                                           length_bits));
}

class WebCryptoHmacTest : public WebCryptoTestBase {};

TEST_F(WebCryptoHmacTest, HMACSampleSets) {
  std::unique_ptr<base::ListValue> tests;
  ASSERT_TRUE(ReadJsonTestFileToList("hmac.json", &tests));
  for (size_t test_index = 0; test_index < tests->GetSize(); ++test_index) {
    SCOPED_TRACE(test_index);
    base::DictionaryValue* test;
    ASSERT_TRUE(tests->GetDictionary(test_index, &test));

    blink::WebCryptoAlgorithm test_hash = GetDigestAlgorithm(test, "hash");
    const std::vector<uint8_t> test_key = GetBytesFromHexString(test, "key");
    const std::vector<uint8_t> test_message =
        GetBytesFromHexString(test, "message");
    const std::vector<uint8_t> test_mac = GetBytesFromHexString(test, "mac");

    blink::WebCryptoAlgorithm algorithm =
        CreateAlgorithm(blink::kWebCryptoAlgorithmIdHmac);

    blink::WebCryptoAlgorithm import_algorithm =
        CreateHmacImportAlgorithmNoLength(test_hash.Id());

    blink::WebCryptoKey key = ImportSecretKeyFromRaw(
        test_key, import_algorithm,
        blink::kWebCryptoKeyUsageSign | blink::kWebCryptoKeyUsageVerify);

    EXPECT_EQ(test_hash.Id(), key.Algorithm().HmacParams()->GetHash().Id());
    EXPECT_EQ(test_key.size() * 8, key.Algorithm().HmacParams()->LengthBits());

    // Verify exported raw key is identical to the imported data
    std::vector<uint8_t> raw_key;
    EXPECT_EQ(Status::Success(),
              ExportKey(blink::kWebCryptoKeyFormatRaw, key, &raw_key));
    EXPECT_BYTES_EQ(test_key, raw_key);

    std::vector<uint8_t> output;

    ASSERT_EQ(Status::Success(),
              Sign(algorithm, key, CryptoData(test_message), &output));

    EXPECT_BYTES_EQ(test_mac, output);

    bool signature_match = false;
    EXPECT_EQ(Status::Success(),
              Verify(algorithm, key, CryptoData(output),
                     CryptoData(test_message), &signature_match));
    EXPECT_TRUE(signature_match);

    // Ensure truncated signature does not verify by passing one less byte.
    EXPECT_EQ(Status::Success(),
              Verify(algorithm, key,
                     CryptoData(output.data(),
                                static_cast<unsigned int>(output.size()) - 1),
                     CryptoData(test_message), &signature_match));
    EXPECT_FALSE(signature_match);

    // Ensure truncated signature does not verify by passing no bytes.
    EXPECT_EQ(Status::Success(),
              Verify(algorithm, key, CryptoData(), CryptoData(test_message),
                     &signature_match));
    EXPECT_FALSE(signature_match);

    // Ensure extra long signature does not cause issues and fails.
    const unsigned char kLongSignature[1024] = {0};
    EXPECT_EQ(Status::Success(),
              Verify(algorithm, key,
                     CryptoData(kLongSignature, sizeof(kLongSignature)),
                     CryptoData(test_message), &signature_match));
    EXPECT_FALSE(signature_match);
  }
}

TEST_F(WebCryptoHmacTest, GenerateKeyIsRandom) {
  // Generate a small sample of HMAC keys.
  std::vector<std::vector<uint8_t>> keys;
  for (int i = 0; i < 16; ++i) {
    std::vector<uint8_t> key_bytes;
    blink::WebCryptoKey key;
    blink::WebCryptoAlgorithm algorithm =
        CreateHmacKeyGenAlgorithm(blink::kWebCryptoAlgorithmIdSha1, 512);
    ASSERT_EQ(Status::Success(),
              GenerateSecretKey(algorithm, true, blink::kWebCryptoKeyUsageSign,
                                &key));
    EXPECT_FALSE(key.IsNull());
    EXPECT_TRUE(key.Handle());
    EXPECT_EQ(blink::kWebCryptoKeyTypeSecret, key.GetType());
    EXPECT_EQ(blink::kWebCryptoAlgorithmIdHmac, key.Algorithm().Id());
    EXPECT_EQ(blink::kWebCryptoAlgorithmIdSha1,
              key.Algorithm().HmacParams()->GetHash().Id());
    EXPECT_EQ(512u, key.Algorithm().HmacParams()->LengthBits());

    std::vector<uint8_t> raw_key;
    ASSERT_EQ(Status::Success(),
              ExportKey(blink::kWebCryptoKeyFormatRaw, key, &raw_key));
    EXPECT_EQ(64U, raw_key.size());
    keys.push_back(raw_key);
  }
  // Ensure all entries in the key sample set are unique. This is a simplistic
  // estimate of whether the generated keys appear random.
  EXPECT_FALSE(CopiesExist(keys));
}

// If the key length is not provided, then the block size is used.
TEST_F(WebCryptoHmacTest, GenerateKeyNoLengthSha1) {
  blink::WebCryptoKey key;
  blink::WebCryptoAlgorithm algorithm =
      CreateHmacKeyGenAlgorithm(blink::kWebCryptoAlgorithmIdSha1, 0);
  ASSERT_EQ(
      Status::Success(),
      GenerateSecretKey(algorithm, true, blink::kWebCryptoKeyUsageSign, &key));
  EXPECT_TRUE(key.Handle());
  EXPECT_EQ(blink::kWebCryptoKeyTypeSecret, key.GetType());
  EXPECT_EQ(blink::kWebCryptoAlgorithmIdHmac, key.Algorithm().Id());
  EXPECT_EQ(blink::kWebCryptoAlgorithmIdSha1,
            key.Algorithm().HmacParams()->GetHash().Id());
  EXPECT_EQ(512u, key.Algorithm().HmacParams()->LengthBits());
  std::vector<uint8_t> raw_key;
  ASSERT_EQ(Status::Success(),
            ExportKey(blink::kWebCryptoKeyFormatRaw, key, &raw_key));
  EXPECT_EQ(64U, raw_key.size());
}

// If the key length is not provided, then the block size is used.
TEST_F(WebCryptoHmacTest, GenerateKeyNoLengthSha512) {
  blink::WebCryptoKey key;
  blink::WebCryptoAlgorithm algorithm =
      CreateHmacKeyGenAlgorithm(blink::kWebCryptoAlgorithmIdSha512, 0);
  ASSERT_EQ(
      Status::Success(),
      GenerateSecretKey(algorithm, true, blink::kWebCryptoKeyUsageSign, &key));
  EXPECT_EQ(blink::kWebCryptoAlgorithmIdHmac, key.Algorithm().Id());
  EXPECT_EQ(blink::kWebCryptoAlgorithmIdSha512,
            key.Algorithm().HmacParams()->GetHash().Id());
  EXPECT_EQ(1024u, key.Algorithm().HmacParams()->LengthBits());
  std::vector<uint8_t> raw_key;
  ASSERT_EQ(Status::Success(),
            ExportKey(blink::kWebCryptoKeyFormatRaw, key, &raw_key));
  EXPECT_EQ(128U, raw_key.size());
}

TEST_F(WebCryptoHmacTest, GenerateKeyEmptyUsage) {
  blink::WebCryptoKey key;
  blink::WebCryptoAlgorithm algorithm =
      CreateHmacKeyGenAlgorithm(blink::kWebCryptoAlgorithmIdSha512, 0);
  ASSERT_EQ(Status::ErrorCreateKeyEmptyUsages(),
            GenerateSecretKey(algorithm, true, 0, &key));
}

// Generate a 1 bit key. The exported key is 1 byte long, and 7 of the bits are
// guaranteed to be zero.
TEST_F(WebCryptoHmacTest, Generate1BitKey) {
  blink::WebCryptoKey key;
  blink::WebCryptoAlgorithm algorithm =
      CreateHmacKeyGenAlgorithm(blink::kWebCryptoAlgorithmIdSha1, 1);

  ASSERT_EQ(
      Status::Success(),
      GenerateSecretKey(algorithm, true, blink::kWebCryptoKeyUsageSign, &key));
  EXPECT_EQ(1u, key.Algorithm().HmacParams()->LengthBits());

  std::vector<uint8_t> raw_key;
  ASSERT_EQ(Status::Success(),
            ExportKey(blink::kWebCryptoKeyFormatRaw, key, &raw_key));
  ASSERT_EQ(1U, raw_key.size());

  EXPECT_FALSE(raw_key[0] & 0x7F);
}

TEST_F(WebCryptoHmacTest, ImportKeyEmptyUsage) {
  blink::WebCryptoKey key;
  std::string key_raw_hex_in = "025a8cf3f08b4f6c5f33bbc76a471939";
  EXPECT_EQ(Status::ErrorCreateKeyEmptyUsages(),
            ImportKey(blink::kWebCryptoKeyFormatRaw,
                      CryptoData(HexStringToBytes(key_raw_hex_in)),
                      CreateHmacImportAlgorithmNoLength(
                          blink::kWebCryptoAlgorithmIdSha1),
                      true, 0, &key));
}

TEST_F(WebCryptoHmacTest, ImportKeyJwkKeyOpsSignVerify) {
  blink::WebCryptoKey key;
  base::DictionaryValue dict;
  dict.SetString("kty", "oct");
  dict.SetString("k", "GADWrMRHwQfoNaXU5fZvTg");
  base::ListValue* key_ops = new base::ListValue;
  dict.Set("key_ops", key_ops);  // Takes ownership.

  key_ops->AppendString("sign");

  EXPECT_EQ(Status::Success(),
            ImportKeyJwkFromDict(dict,
                                 CreateHmacImportAlgorithmNoLength(
                                     blink::kWebCryptoAlgorithmIdSha256),
                                 false, blink::kWebCryptoKeyUsageSign, &key));

  EXPECT_EQ(blink::kWebCryptoKeyUsageSign, key.Usages());

  key_ops->AppendString("verify");

  EXPECT_EQ(Status::Success(),
            ImportKeyJwkFromDict(dict,
                                 CreateHmacImportAlgorithmNoLength(
                                     blink::kWebCryptoAlgorithmIdSha256),
                                 false, blink::kWebCryptoKeyUsageVerify, &key));

  EXPECT_EQ(blink::kWebCryptoKeyUsageVerify, key.Usages());
}

// Test 'use' inconsistent with 'key_ops'.
TEST_F(WebCryptoHmacTest, ImportKeyJwkUseInconsisteWithKeyOps) {
  blink::WebCryptoKey key;
  base::DictionaryValue dict;
  dict.SetString("kty", "oct");
  dict.SetString("k", "GADWrMRHwQfoNaXU5fZvTg");
  base::ListValue* key_ops = new base::ListValue;
  dict.Set("key_ops", key_ops);  // Takes ownership.

  dict.SetString("alg", "HS256");
  dict.SetString("use", "sig");
  key_ops->AppendString("sign");
  key_ops->AppendString("verify");
  key_ops->AppendString("encrypt");
  EXPECT_EQ(
      Status::ErrorJwkUseAndKeyopsInconsistent(),
      ImportKeyJwkFromDict(
          dict,
          CreateHmacImportAlgorithmNoLength(blink::kWebCryptoAlgorithmIdSha256),
          false,
          blink::kWebCryptoKeyUsageSign | blink::kWebCryptoKeyUsageVerify,
          &key));
}

// Test JWK composite 'sig' use
TEST_F(WebCryptoHmacTest, ImportKeyJwkUseSig) {
  blink::WebCryptoKey key;
  base::DictionaryValue dict;
  dict.SetString("kty", "oct");
  dict.SetString("k", "GADWrMRHwQfoNaXU5fZvTg");

  dict.SetString("use", "sig");
  EXPECT_EQ(
      Status::Success(),
      ImportKeyJwkFromDict(
          dict,
          CreateHmacImportAlgorithmNoLength(blink::kWebCryptoAlgorithmIdSha256),
          false,
          blink::kWebCryptoKeyUsageSign | blink::kWebCryptoKeyUsageVerify,
          &key));

  EXPECT_EQ(blink::kWebCryptoKeyUsageSign | blink::kWebCryptoKeyUsageVerify,
            key.Usages());
}

TEST_F(WebCryptoHmacTest, ImportJwkInputConsistency) {
  // The Web Crypto spec says that if a JWK value is present, but is
  // inconsistent with the input value, the operation must fail.

  // Consistency rules when JWK value is not present: Inputs should be used.
  blink::WebCryptoKey key;
  bool extractable = false;
  blink::WebCryptoAlgorithm algorithm =
      CreateHmacImportAlgorithmNoLength(blink::kWebCryptoAlgorithmIdSha256);
  blink::WebCryptoKeyUsageMask usages = blink::kWebCryptoKeyUsageVerify;
  base::DictionaryValue dict;
  dict.SetString("kty", "oct");
  dict.SetString("k", "l3nZEgZCeX8XRwJdWyK3rGB8qwjhdY8vOkbIvh4lxTuMao9Y_--hdg");
  std::vector<uint8_t> json_vec = MakeJsonVector(dict);
  EXPECT_EQ(Status::Success(),
            ImportKey(blink::kWebCryptoKeyFormatJwk, CryptoData(json_vec),
                      algorithm, extractable, usages, &key));
  EXPECT_TRUE(key.Handle());
  EXPECT_EQ(blink::kWebCryptoKeyTypeSecret, key.GetType());
  EXPECT_EQ(extractable, key.Extractable());
  EXPECT_EQ(blink::kWebCryptoAlgorithmIdHmac, key.Algorithm().Id());
  EXPECT_EQ(blink::kWebCryptoAlgorithmIdSha256,
            key.Algorithm().HmacParams()->GetHash().Id());
  EXPECT_EQ(320u, key.Algorithm().HmacParams()->LengthBits());
  EXPECT_EQ(blink::kWebCryptoKeyUsageVerify, key.Usages());
  key = blink::WebCryptoKey::CreateNull();

  // Consistency rules when JWK value exists: Fail if inconsistency is found.

  // Pass: All input values are consistent with the JWK values.
  dict.Clear();
  dict.SetString("kty", "oct");
  dict.SetString("alg", "HS256");
  dict.SetString("use", "sig");
  dict.SetBoolean("ext", false);
  dict.SetString("k", "l3nZEgZCeX8XRwJdWyK3rGB8qwjhdY8vOkbIvh4lxTuMao9Y_--hdg");
  json_vec = MakeJsonVector(dict);
  EXPECT_EQ(Status::Success(),
            ImportKey(blink::kWebCryptoKeyFormatJwk, CryptoData(json_vec),
                      algorithm, extractable, usages, &key));

  // Extractable cases:
  // 1. input=T, JWK=F ==> fail (inconsistent)
  // 4. input=F, JWK=F ==> pass, result extractable is F
  // 2. input=T, JWK=T ==> pass, result extractable is T
  // 3. input=F, JWK=T ==> pass, result extractable is F
  EXPECT_EQ(Status::ErrorJwkExtInconsistent(),
            ImportKey(blink::kWebCryptoKeyFormatJwk, CryptoData(json_vec),
                      algorithm, true, usages, &key));
  EXPECT_EQ(Status::Success(),
            ImportKey(blink::kWebCryptoKeyFormatJwk, CryptoData(json_vec),
                      algorithm, false, usages, &key));
  EXPECT_FALSE(key.Extractable());
  dict.SetBoolean("ext", true);
  EXPECT_EQ(Status::Success(),
            ImportKeyJwkFromDict(dict, algorithm, true, usages, &key));
  EXPECT_TRUE(key.Extractable());
  EXPECT_EQ(Status::Success(),
            ImportKeyJwkFromDict(dict, algorithm, false, usages, &key));
  EXPECT_FALSE(key.Extractable());
  dict.SetBoolean("ext", true);  // restore previous value

  // Fail: Input algorithm (AES-CBC) is inconsistent with JWK value
  // (HMAC SHA256).
  dict.Clear();
  dict.SetString("kty", "oct");
  dict.SetString("alg", "HS256");
  dict.SetString("k", "l3nZEgZCeX8XRwJdWyK3rGB8qwjhdY8vOkbIvh4lxTuMao9Y_--hdg");
  EXPECT_EQ(Status::ErrorJwkAlgorithmInconsistent(),
            ImportKeyJwkFromDict(
                dict, CreateAlgorithm(blink::kWebCryptoAlgorithmIdAesCbc),
                extractable, blink::kWebCryptoKeyUsageEncrypt, &key));
  // Fail: Input usage (encrypt) is inconsistent with JWK value (use=sig).
  EXPECT_EQ(Status::ErrorJwkUseInconsistent(),
            ImportKey(blink::kWebCryptoKeyFormatJwk, CryptoData(json_vec),
                      CreateAlgorithm(blink::kWebCryptoAlgorithmIdAesCbc),
                      extractable, blink::kWebCryptoKeyUsageEncrypt, &key));

  // Fail: Input algorithm (HMAC SHA1) is inconsistent with JWK value
  // (HMAC SHA256).
  EXPECT_EQ(Status::ErrorJwkAlgorithmInconsistent(),
            ImportKey(blink::kWebCryptoKeyFormatJwk, CryptoData(json_vec),
                      CreateHmacImportAlgorithmNoLength(
                          blink::kWebCryptoAlgorithmIdSha1),
                      extractable, usages, &key));

  // Pass: JWK alg missing but input algorithm specified: use input value
  dict.Remove("alg", NULL);
  EXPECT_EQ(Status::Success(),
            ImportKeyJwkFromDict(dict,
                                 CreateHmacImportAlgorithmNoLength(
                                     blink::kWebCryptoAlgorithmIdSha256),
                                 extractable, usages, &key));
  EXPECT_EQ(blink::kWebCryptoAlgorithmIdHmac, algorithm.Id());
  dict.SetString("alg", "HS256");

  // Fail: Input usages (encrypt) is not a subset of the JWK value
  // (sign|verify). Moreover "encrypt" is not a valid usage for HMAC.
  EXPECT_EQ(
      Status::ErrorCreateKeyBadUsages(),
      ImportKey(blink::kWebCryptoKeyFormatJwk, CryptoData(json_vec), algorithm,
                extractable, blink::kWebCryptoKeyUsageEncrypt, &key));

  // Fail: Input usages (encrypt|sign|verify) is not a subset of the JWK
  // value (sign|verify). Moreover "encrypt" is not a valid usage for HMAC.
  usages = blink::kWebCryptoKeyUsageEncrypt | blink::kWebCryptoKeyUsageSign |
           blink::kWebCryptoKeyUsageVerify;
  EXPECT_EQ(Status::ErrorCreateKeyBadUsages(),
            ImportKey(blink::kWebCryptoKeyFormatJwk, CryptoData(json_vec),
                      algorithm, extractable, usages, &key));

  // TODO(padolph): kty vs alg consistency tests: Depending on the kty value,
  // only certain alg values are permitted. For example, when kty = "RSA" alg
  // must be of the RSA family, or when kty = "oct" alg must be symmetric
  // algorithm.

  // TODO(padolph): key_ops consistency tests
}

TEST_F(WebCryptoHmacTest, ImportJwkHappy) {
  // This test verifies the happy path of JWK import, including the application
  // of the imported key material.

  blink::WebCryptoKey key;
  bool extractable = false;
  blink::WebCryptoAlgorithm algorithm =
      CreateHmacImportAlgorithmNoLength(blink::kWebCryptoAlgorithmIdSha256);
  blink::WebCryptoKeyUsageMask usages = blink::kWebCryptoKeyUsageSign;

  // Import a symmetric key JWK and HMAC-SHA256 sign()
  // Uses the first SHA256 test vector from the HMAC sample set above.

  base::DictionaryValue dict;
  dict.SetString("kty", "oct");
  dict.SetString("alg", "HS256");
  dict.SetString("use", "sig");
  dict.SetBoolean("ext", false);
  dict.SetString("k", "l3nZEgZCeX8XRwJdWyK3rGB8qwjhdY8vOkbIvh4lxTuMao9Y_--hdg");

  ASSERT_EQ(Status::Success(),
            ImportKeyJwkFromDict(dict, algorithm, extractable, usages, &key));

  EXPECT_EQ(blink::kWebCryptoAlgorithmIdSha256,
            key.Algorithm().HmacParams()->GetHash().Id());

  const std::vector<uint8_t> message_raw = HexStringToBytes(
      "b1689c2591eaf3c9e66070f8a77954ffb81749f1b00346f9dfe0b2ee905dcc288baf4a"
      "92de3f4001dd9f44c468c3d07d6c6ee82faceafc97c2fc0fc0601719d2dcd0aa2aec92"
      "d1b0ae933c65eb06a03c9c935c2bad0459810241347ab87e9f11adb30415424c6c7f5f"
      "22a003b8ab8de54f6ded0e3ab9245fa79568451dfa258e");

  std::vector<uint8_t> output;

  ASSERT_EQ(Status::Success(),
            Sign(CreateAlgorithm(blink::kWebCryptoAlgorithmIdHmac), key,
                 CryptoData(message_raw), &output));

  const std::string mac_raw =
      "769f00d3e6a6cc1fb426a14a4f76c6462e6149726e0dee0ec0cf97a16605ac8b";

  EXPECT_BYTES_EQ_HEX(mac_raw, output);

  // TODO(padolph): Import an RSA public key JWK and use it
}

TEST_F(WebCryptoHmacTest, ImportExportJwk) {
  // HMAC SHA-1
  ImportExportJwkSymmetricKey(
      256, CreateHmacImportAlgorithmNoLength(blink::kWebCryptoAlgorithmIdSha1),
      blink::kWebCryptoKeyUsageSign | blink::kWebCryptoKeyUsageVerify, "HS1");

  // HMAC SHA-384
  ImportExportJwkSymmetricKey(
      384,
      CreateHmacImportAlgorithmNoLength(blink::kWebCryptoAlgorithmIdSha384),
      blink::kWebCryptoKeyUsageSign, "HS384");

  // HMAC SHA-512
  ImportExportJwkSymmetricKey(
      512,
      CreateHmacImportAlgorithmNoLength(blink::kWebCryptoAlgorithmIdSha512),
      blink::kWebCryptoKeyUsageVerify, "HS512");
}

TEST_F(WebCryptoHmacTest, ExportJwkEmptyKey) {
  blink::WebCryptoKeyUsageMask usages = blink::kWebCryptoKeyUsageSign;

  // Importing empty HMAC key is no longer allowed. However such a key can be
  // created via de-serialization.
  blink::WebCryptoKey key;
  ASSERT_TRUE(DeserializeKeyForClone(blink::WebCryptoKeyAlgorithm::CreateHmac(
                                         blink::kWebCryptoAlgorithmIdSha1, 0),
                                     blink::kWebCryptoKeyTypeSecret, true,
                                     usages, CryptoData(), &key));

  // Export the key in JWK format and validate.
  std::vector<uint8_t> json;
  ASSERT_EQ(Status::Success(),
            ExportKey(blink::kWebCryptoKeyFormatJwk, key, &json));
  EXPECT_TRUE(VerifySecretJwk(json, "HS1", "", usages));

  // Now try re-importing the JWK key.
  key = blink::WebCryptoKey::CreateNull();
  EXPECT_EQ(Status::ErrorHmacImportEmptyKey(),
            ImportKey(blink::kWebCryptoKeyFormatJwk, CryptoData(json),
                      CreateHmacImportAlgorithmNoLength(
                          blink::kWebCryptoAlgorithmIdSha1),
                      true, usages, &key));
}

// Imports an HMAC key contaning no byte data.
TEST_F(WebCryptoHmacTest, ImportRawEmptyKey) {
  const blink::WebCryptoAlgorithm import_algorithm =
      CreateHmacImportAlgorithmNoLength(blink::kWebCryptoAlgorithmIdSha1);

  blink::WebCryptoKeyUsageMask usages = blink::kWebCryptoKeyUsageSign;
  blink::WebCryptoKey key;

  ASSERT_EQ(Status::ErrorHmacImportEmptyKey(),
            ImportKey(blink::kWebCryptoKeyFormatRaw, CryptoData(),
                      import_algorithm, true, usages, &key));
}

// Imports an HMAC key contaning 1 byte data, however the length was set to 0.
TEST_F(WebCryptoHmacTest, ImportRawKeyWithZeroLength) {
  const blink::WebCryptoAlgorithm import_algorithm =
      CreateHmacImportAlgorithm(blink::kWebCryptoAlgorithmIdSha1, 0);

  blink::WebCryptoKeyUsageMask usages = blink::kWebCryptoKeyUsageSign;
  blink::WebCryptoKey key;

  std::vector<uint8_t> key_data(1);
  ASSERT_EQ(Status::ErrorHmacImportBadLength(),
            ImportKey(blink::kWebCryptoKeyFormatRaw, CryptoData(key_data),
                      import_algorithm, true, usages, &key));
}

// Import a huge hmac key (UINT_MAX bytes). This will fail before actually
// reading the bytes, as the key is too large.
TEST_F(WebCryptoHmacTest, ImportRawKeyTooLarge) {
  CryptoData big_data(NULL, UINT_MAX);  // Invalid data of big length.

  blink::WebCryptoKey key;
  EXPECT_EQ(Status::ErrorDataTooLarge(),
            ImportKey(blink::kWebCryptoKeyFormatRaw, CryptoData(big_data),
                      CreateHmacImportAlgorithmNoLength(
                          blink::kWebCryptoAlgorithmIdSha1),
                      true, blink::kWebCryptoKeyUsageSign, &key));
}

// Import an HMAC key with 120 bits of data, however request 128 bits worth.
TEST_F(WebCryptoHmacTest, ImportRawKeyLengthTooLarge) {
  blink::WebCryptoKey key;
  EXPECT_EQ(Status::ErrorHmacImportBadLength(),
            ImportKey(blink::kWebCryptoKeyFormatRaw,
                      CryptoData(std::vector<uint8_t>(15)),
                      CreateHmacImportAlgorithmWithLength(
                          blink::kWebCryptoAlgorithmIdSha1, 128),
                      true, blink::kWebCryptoKeyUsageSign, &key));
}

// Import an HMAC key with 128 bits of data, however request 120 bits worth.
TEST_F(WebCryptoHmacTest, ImportRawKeyLengthTooSmall) {
  blink::WebCryptoKey key;
  EXPECT_EQ(Status::ErrorHmacImportBadLength(),
            ImportKey(blink::kWebCryptoKeyFormatRaw,
                      CryptoData(std::vector<uint8_t>(16)),
                      CreateHmacImportAlgorithmWithLength(
                          blink::kWebCryptoAlgorithmIdSha1, 120),
                      true, blink::kWebCryptoKeyUsageSign, &key));
}

// Import an HMAC key with 16 bits of data and request a 12 bit key, using the
// "raw" format.
TEST_F(WebCryptoHmacTest, ImportRawKeyTruncation) {
  const std::vector<uint8_t> data = HexStringToBytes("b1ff");

  blink::WebCryptoKey key;
  EXPECT_EQ(Status::Success(),
            ImportKey(blink::kWebCryptoKeyFormatRaw, CryptoData(data),
                      CreateHmacImportAlgorithmWithLength(
                          blink::kWebCryptoAlgorithmIdSha1, 12),
                      true, blink::kWebCryptoKeyUsageSign, &key));

  // On export the last 4 bits has been set to zero.
  std::vector<uint8_t> raw_key;
  EXPECT_EQ(Status::Success(),
            ExportKey(blink::kWebCryptoKeyFormatRaw, key, &raw_key));
  EXPECT_BYTES_EQ(HexStringToBytes("b1f0"), raw_key);
}

// The same test as above, but using the JWK format.
TEST_F(WebCryptoHmacTest, ImportJwkKeyTruncation) {
  base::DictionaryValue dict;
  dict.SetString("kty", "oct");
  dict.SetString("k", "sf8");  // 0xB1FF

  blink::WebCryptoKey key;
  EXPECT_EQ(Status::Success(),
            ImportKeyJwkFromDict(dict,
                                 CreateHmacImportAlgorithmWithLength(
                                     blink::kWebCryptoAlgorithmIdSha1, 12),
                                 true, blink::kWebCryptoKeyUsageSign, &key));

  // On export the last 4 bits has been set to zero.
  std::vector<uint8_t> raw_key;
  EXPECT_EQ(Status::Success(),
            ExportKey(blink::kWebCryptoKeyFormatRaw, key, &raw_key));
  EXPECT_BYTES_EQ(HexStringToBytes("b1f0"), raw_key);
}

}  // namespace

}  // namespace webcrypto