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| 1 // Copyright 2014 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "content/child/webcrypto/algorithm_dispatch.h" | |
| 6 | |
| 7 #include "base/logging.h" | |
| 8 #include "content/child/webcrypto/algorithm_implementation.h" | |
| 9 #include "content/child/webcrypto/algorithm_registry.h" | |
| 10 #include "content/child/webcrypto/crypto_data.h" | |
| 11 #include "content/child/webcrypto/generate_key_result.h" | |
| 12 #include "content/child/webcrypto/platform_crypto.h" | |
| 13 #include "content/child/webcrypto/status.h" | |
| 14 #include "content/child/webcrypto/webcrypto_util.h" | |
| 15 #include "third_party/WebKit/public/platform/WebCryptoKeyAlgorithm.h" | |
| 16 | |
| 17 namespace content { | |
| 18 | |
| 19 namespace webcrypto { | |
| 20 | |
| 21 namespace { | |
| 22 | |
| 23 Status DecryptDontCheckKeyUsage(const blink::WebCryptoAlgorithm& algorithm, | |
| 24 const blink::WebCryptoKey& key, | |
| 25 const CryptoData& data, | |
| 26 std::vector<uint8_t>* buffer) { | |
| 27 if (algorithm.id() != key.algorithm().id()) | |
| 28 return Status::ErrorUnexpected(); | |
| 29 | |
| 30 const AlgorithmImplementation* impl = NULL; | |
| 31 Status status = GetAlgorithmImplementation(algorithm.id(), &impl); | |
| 32 if (status.IsError()) | |
| 33 return status; | |
| 34 | |
| 35 return impl->Decrypt(algorithm, key, data, buffer); | |
| 36 } | |
| 37 | |
| 38 Status EncryptDontCheckUsage(const blink::WebCryptoAlgorithm& algorithm, | |
| 39 const blink::WebCryptoKey& key, | |
| 40 const CryptoData& data, | |
| 41 std::vector<uint8_t>* buffer) { | |
| 42 if (algorithm.id() != key.algorithm().id()) | |
| 43 return Status::ErrorUnexpected(); | |
| 44 | |
| 45 const AlgorithmImplementation* impl = NULL; | |
| 46 Status status = GetAlgorithmImplementation(algorithm.id(), &impl); | |
| 47 if (status.IsError()) | |
| 48 return status; | |
| 49 | |
| 50 return impl->Encrypt(algorithm, key, data, buffer); | |
| 51 } | |
| 52 | |
| 53 Status ExportKeyDontCheckExtractability(blink::WebCryptoKeyFormat format, | |
| 54 const blink::WebCryptoKey& key, | |
| 55 std::vector<uint8_t>* buffer) { | |
| 56 const AlgorithmImplementation* impl = NULL; | |
| 57 Status status = GetAlgorithmImplementation(key.algorithm().id(), &impl); | |
| 58 if (status.IsError()) | |
| 59 return status; | |
| 60 | |
| 61 return impl->ExportKey(format, key, buffer); | |
| 62 } | |
| 63 | |
| 64 } // namespace | |
| 65 | |
| 66 Status Encrypt(const blink::WebCryptoAlgorithm& algorithm, | |
| 67 const blink::WebCryptoKey& key, | |
| 68 const CryptoData& data, | |
| 69 std::vector<uint8_t>* buffer) { | |
| 70 if (!KeyUsageAllows(key, blink::WebCryptoKeyUsageEncrypt)) | |
| 71 return Status::ErrorUnexpected(); | |
| 72 return EncryptDontCheckUsage(algorithm, key, data, buffer); | |
| 73 } | |
| 74 | |
| 75 Status Decrypt(const blink::WebCryptoAlgorithm& algorithm, | |
| 76 const blink::WebCryptoKey& key, | |
| 77 const CryptoData& data, | |
| 78 std::vector<uint8_t>* buffer) { | |
| 79 if (!KeyUsageAllows(key, blink::WebCryptoKeyUsageDecrypt)) | |
| 80 return Status::ErrorUnexpected(); | |
| 81 return DecryptDontCheckKeyUsage(algorithm, key, data, buffer); | |
| 82 } | |
| 83 | |
| 84 Status Digest(const blink::WebCryptoAlgorithm& algorithm, | |
| 85 const CryptoData& data, | |
| 86 std::vector<uint8_t>* buffer) { | |
| 87 const AlgorithmImplementation* impl = NULL; | |
| 88 Status status = GetAlgorithmImplementation(algorithm.id(), &impl); | |
| 89 if (status.IsError()) | |
| 90 return status; | |
| 91 | |
| 92 return impl->Digest(algorithm, data, buffer); | |
| 93 } | |
| 94 | |
| 95 Status GenerateKey(const blink::WebCryptoAlgorithm& algorithm, | |
| 96 bool extractable, | |
| 97 blink::WebCryptoKeyUsageMask usages, | |
| 98 GenerateKeyResult* result) { | |
| 99 const AlgorithmImplementation* impl = NULL; | |
| 100 Status status = GetAlgorithmImplementation(algorithm.id(), &impl); | |
| 101 if (status.IsError()) | |
| 102 return status; | |
| 103 | |
| 104 status = impl->GenerateKey(algorithm, extractable, usages, result); | |
| 105 if (status.IsError()) | |
| 106 return status; | |
| 107 | |
| 108 const blink::WebCryptoKey* key = NULL; | |
| 109 if (result->type() == GenerateKeyResult::TYPE_SECRET_KEY) | |
| 110 key = &result->secret_key(); | |
| 111 if (result->type() == GenerateKeyResult::TYPE_PUBLIC_PRIVATE_KEY_PAIR) | |
| 112 key = &result->private_key(); | |
| 113 if (key == NULL) | |
| 114 return Status::ErrorUnexpected(); | |
| 115 | |
| 116 // This should only fail if an algorithm is implemented incorrectly and | |
| 117 // does not do its own check of the usages. | |
| 118 if (key->usages() == 0) { | |
| 119 DCHECK(false) << "Key usages for generateKey() must not be empty"; | |
| 120 return Status::ErrorCreateKeyEmptyUsages(); | |
| 121 } | |
| 122 return status; | |
| 123 } | |
| 124 | |
| 125 Status ImportKey(blink::WebCryptoKeyFormat format, | |
| 126 const CryptoData& key_data, | |
| 127 const blink::WebCryptoAlgorithm& algorithm, | |
| 128 bool extractable, | |
| 129 blink::WebCryptoKeyUsageMask usages, | |
| 130 blink::WebCryptoKey* key) { | |
| 131 const AlgorithmImplementation* impl = NULL; | |
| 132 Status status = GetAlgorithmImplementation(algorithm.id(), &impl); | |
| 133 if (status.IsError()) | |
| 134 return status; | |
| 135 | |
| 136 status = impl->VerifyKeyUsagesBeforeImportKey(format, usages); | |
| 137 if (status.IsError()) | |
| 138 return status; | |
| 139 | |
| 140 return impl->ImportKey(format, key_data, algorithm, extractable, usages, key); | |
| 141 } | |
| 142 | |
| 143 Status ExportKey(blink::WebCryptoKeyFormat format, | |
| 144 const blink::WebCryptoKey& key, | |
| 145 std::vector<uint8_t>* buffer) { | |
| 146 if (!key.extractable()) | |
| 147 return Status::ErrorKeyNotExtractable(); | |
| 148 return ExportKeyDontCheckExtractability(format, key, buffer); | |
| 149 } | |
| 150 | |
| 151 Status Sign(const blink::WebCryptoAlgorithm& algorithm, | |
| 152 const blink::WebCryptoKey& key, | |
| 153 const CryptoData& data, | |
| 154 std::vector<uint8_t>* buffer) { | |
| 155 if (!KeyUsageAllows(key, blink::WebCryptoKeyUsageSign)) | |
| 156 return Status::ErrorUnexpected(); | |
| 157 if (algorithm.id() != key.algorithm().id()) | |
| 158 return Status::ErrorUnexpected(); | |
| 159 | |
| 160 const AlgorithmImplementation* impl = NULL; | |
| 161 Status status = GetAlgorithmImplementation(algorithm.id(), &impl); | |
| 162 if (status.IsError()) | |
| 163 return status; | |
| 164 | |
| 165 return impl->Sign(algorithm, key, data, buffer); | |
| 166 } | |
| 167 | |
| 168 Status Verify(const blink::WebCryptoAlgorithm& algorithm, | |
| 169 const blink::WebCryptoKey& key, | |
| 170 const CryptoData& signature, | |
| 171 const CryptoData& data, | |
| 172 bool* signature_match) { | |
| 173 if (!KeyUsageAllows(key, blink::WebCryptoKeyUsageVerify)) | |
| 174 return Status::ErrorUnexpected(); | |
| 175 if (algorithm.id() != key.algorithm().id()) | |
| 176 return Status::ErrorUnexpected(); | |
| 177 | |
| 178 const AlgorithmImplementation* impl = NULL; | |
| 179 Status status = GetAlgorithmImplementation(algorithm.id(), &impl); | |
| 180 if (status.IsError()) | |
| 181 return status; | |
| 182 | |
| 183 return impl->Verify(algorithm, key, signature, data, signature_match); | |
| 184 } | |
| 185 | |
| 186 Status WrapKey(blink::WebCryptoKeyFormat format, | |
| 187 const blink::WebCryptoKey& key_to_wrap, | |
| 188 const blink::WebCryptoKey& wrapping_key, | |
| 189 const blink::WebCryptoAlgorithm& wrapping_algorithm, | |
| 190 std::vector<uint8_t>* buffer) { | |
| 191 if (!KeyUsageAllows(wrapping_key, blink::WebCryptoKeyUsageWrapKey)) | |
| 192 return Status::ErrorUnexpected(); | |
| 193 | |
| 194 std::vector<uint8_t> exported_data; | |
| 195 Status status = ExportKey(format, key_to_wrap, &exported_data); | |
| 196 if (status.IsError()) | |
| 197 return status; | |
| 198 return EncryptDontCheckUsage(wrapping_algorithm, wrapping_key, | |
| 199 CryptoData(exported_data), buffer); | |
| 200 } | |
| 201 | |
| 202 Status UnwrapKey(blink::WebCryptoKeyFormat format, | |
| 203 const CryptoData& wrapped_key_data, | |
| 204 const blink::WebCryptoKey& wrapping_key, | |
| 205 const blink::WebCryptoAlgorithm& wrapping_algorithm, | |
| 206 const blink::WebCryptoAlgorithm& algorithm, | |
| 207 bool extractable, | |
| 208 blink::WebCryptoKeyUsageMask usages, | |
| 209 blink::WebCryptoKey* key) { | |
| 210 if (!KeyUsageAllows(wrapping_key, blink::WebCryptoKeyUsageUnwrapKey)) | |
| 211 return Status::ErrorUnexpected(); | |
| 212 if (wrapping_algorithm.id() != wrapping_key.algorithm().id()) | |
| 213 return Status::ErrorUnexpected(); | |
| 214 | |
| 215 // Fail fast if the import is doomed to fail. | |
| 216 const AlgorithmImplementation* import_impl = NULL; | |
| 217 Status status = GetAlgorithmImplementation(algorithm.id(), &import_impl); | |
| 218 if (status.IsError()) | |
| 219 return status; | |
| 220 | |
| 221 status = import_impl->VerifyKeyUsagesBeforeImportKey(format, usages); | |
| 222 if (status.IsError()) | |
| 223 return status; | |
| 224 | |
| 225 std::vector<uint8_t> buffer; | |
| 226 status = DecryptDontCheckKeyUsage(wrapping_algorithm, wrapping_key, | |
| 227 wrapped_key_data, &buffer); | |
| 228 if (status.IsError()) | |
| 229 return status; | |
| 230 | |
| 231 // NOTE that returning the details of ImportKey() failures may leak | |
| 232 // information about the plaintext of the encrypted key (for instance the JWK | |
| 233 // key_ops). As long as the ImportKey error messages don't describe actual | |
| 234 // key bytes however this should be OK. For more discussion see | |
| 235 // http://crubg.com/372040 | |
| 236 return ImportKey(format, CryptoData(buffer), algorithm, extractable, usages, | |
| 237 key); | |
| 238 } | |
| 239 | |
| 240 Status DeriveBits(const blink::WebCryptoAlgorithm& algorithm, | |
| 241 const blink::WebCryptoKey& base_key, | |
| 242 unsigned int length_bits, | |
| 243 std::vector<uint8_t>* derived_bytes) { | |
| 244 if (!KeyUsageAllows(base_key, blink::WebCryptoKeyUsageDeriveBits)) | |
| 245 return Status::ErrorUnexpected(); | |
| 246 | |
| 247 if (algorithm.id() != base_key.algorithm().id()) | |
| 248 return Status::ErrorUnexpected(); | |
| 249 | |
| 250 const AlgorithmImplementation* impl = NULL; | |
| 251 Status status = GetAlgorithmImplementation(algorithm.id(), &impl); | |
| 252 if (status.IsError()) | |
| 253 return status; | |
| 254 | |
| 255 return impl->DeriveBits(algorithm, base_key, true, length_bits, | |
| 256 derived_bytes); | |
| 257 } | |
| 258 | |
| 259 Status DeriveKey(const blink::WebCryptoAlgorithm& algorithm, | |
| 260 const blink::WebCryptoKey& base_key, | |
| 261 const blink::WebCryptoAlgorithm& import_algorithm, | |
| 262 const blink::WebCryptoAlgorithm& key_length_algorithm, | |
| 263 bool extractable, | |
| 264 blink::WebCryptoKeyUsageMask usages, | |
| 265 blink::WebCryptoKey* derived_key) { | |
| 266 if (!KeyUsageAllows(base_key, blink::WebCryptoKeyUsageDeriveKey)) | |
| 267 return Status::ErrorUnexpected(); | |
| 268 | |
| 269 if (algorithm.id() != base_key.algorithm().id()) | |
| 270 return Status::ErrorUnexpected(); | |
| 271 | |
| 272 if (import_algorithm.id() != key_length_algorithm.id()) | |
| 273 return Status::ErrorUnexpected(); | |
| 274 | |
| 275 const AlgorithmImplementation* import_impl = NULL; | |
| 276 Status status = | |
| 277 GetAlgorithmImplementation(import_algorithm.id(), &import_impl); | |
| 278 if (status.IsError()) | |
| 279 return status; | |
| 280 | |
| 281 // Fail fast if the requested key usages are incorect. | |
| 282 status = import_impl->VerifyKeyUsagesBeforeImportKey( | |
| 283 blink::WebCryptoKeyFormatRaw, usages); | |
| 284 if (status.IsError()) | |
| 285 return status; | |
| 286 | |
| 287 // Determine how many bits long the derived key should be. | |
| 288 unsigned int length_bits = 0; | |
| 289 bool has_length_bits = false; | |
| 290 status = import_impl->GetKeyLength(key_length_algorithm, &has_length_bits, | |
| 291 &length_bits); | |
| 292 if (status.IsError()) | |
| 293 return status; | |
| 294 | |
| 295 // Derive the key bytes. | |
| 296 const AlgorithmImplementation* derive_impl = NULL; | |
| 297 status = GetAlgorithmImplementation(algorithm.id(), &derive_impl); | |
| 298 if (status.IsError()) | |
| 299 return status; | |
| 300 | |
| 301 std::vector<uint8_t> derived_bytes; | |
| 302 status = derive_impl->DeriveBits(algorithm, base_key, has_length_bits, | |
| 303 length_bits, &derived_bytes); | |
| 304 if (status.IsError()) | |
| 305 return status; | |
| 306 | |
| 307 // Create the key using the derived bytes. | |
| 308 return ImportKey(blink::WebCryptoKeyFormatRaw, CryptoData(derived_bytes), | |
| 309 import_algorithm, extractable, usages, derived_key); | |
| 310 } | |
| 311 | |
| 312 scoped_ptr<blink::WebCryptoDigestor> CreateDigestor( | |
| 313 blink::WebCryptoAlgorithmId algorithm) { | |
| 314 PlatformInit(); | |
| 315 return CreatePlatformDigestor(algorithm); | |
| 316 } | |
| 317 | |
| 318 bool SerializeKeyForClone(const blink::WebCryptoKey& key, | |
| 319 blink::WebVector<uint8_t>* key_data) { | |
| 320 const AlgorithmImplementation* impl = NULL; | |
| 321 Status status = GetAlgorithmImplementation(key.algorithm().id(), &impl); | |
| 322 if (status.IsError()) | |
| 323 return false; | |
| 324 | |
| 325 status = impl->SerializeKeyForClone(key, key_data); | |
| 326 return status.IsSuccess(); | |
| 327 } | |
| 328 | |
| 329 bool DeserializeKeyForClone(const blink::WebCryptoKeyAlgorithm& algorithm, | |
| 330 blink::WebCryptoKeyType type, | |
| 331 bool extractable, | |
| 332 blink::WebCryptoKeyUsageMask usages, | |
| 333 const CryptoData& key_data, | |
| 334 blink::WebCryptoKey* key) { | |
| 335 const AlgorithmImplementation* impl = NULL; | |
| 336 Status status = GetAlgorithmImplementation(algorithm.id(), &impl); | |
| 337 if (status.IsError()) | |
| 338 return false; | |
| 339 | |
| 340 status = impl->DeserializeKeyForClone(algorithm, type, extractable, usages, | |
| 341 key_data, key); | |
| 342 return status.IsSuccess(); | |
| 343 } | |
| 344 | |
| 345 } // namespace webcrypto | |
| 346 | |
| 347 } // namespace content | |
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Chromium Code Reviews
Issue 1077273002:
html_viewer: Move webcrypto to a place where html_viewer can use it. (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master