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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/renderer/webcrypto/shared_crypto.h" | |
| 6 | |
| 7 #include "base/logging.h" | |
| 8 #include "content/renderer/webcrypto/crypto_data.h" | |
| 9 #include "content/renderer/webcrypto/platform_crypto.h" | |
| 10 #include "content/renderer/webcrypto/webcrypto_util.h" | |
| 11 #include "crypto/secure_util.h" | |
| 12 #include "third_party/WebKit/public/platform/WebCryptoAlgorithm.h" | |
| 13 #include "third_party/WebKit/public/platform/WebCryptoAlgorithmParams.h" | |
| 14 #include "third_party/WebKit/public/platform/WebCryptoKeyAlgorithm.h" | |
| 15 #include "third_party/WebKit/public/platform/WebCryptoKey.h" | |
| 16 | |
| 17 namespace content { | |
| 18 | |
| 19 namespace webcrypto { | |
| 20 | |
| 21 namespace { | |
| 22 | |
| 23 // TODO(eroman): Move this helper to WebCryptoKey. | |
| 24 bool KeyUsageAllows(const blink::WebCryptoKey& key, | |
| 25 const blink::WebCryptoKeyUsage usage) { | |
| 26 return ((key.usages() & usage) != 0); | |
| 27 } | |
| 28 | |
| 29 bool IsValidAesKeyLengthBits(unsigned int length_bits) { | |
| 30 return length_bits == 128 || length_bits == 192 || length_bits == 256; | |
| 31 } | |
| 32 | |
| 33 bool IsValidAesKeyLengthBytes(unsigned int length_bytes) { | |
| 34 return length_bytes == 16 || length_bytes == 24 || length_bytes == 32; | |
| 35 } | |
| 36 | |
| 37 Status ToPlatformSymKey(const blink::WebCryptoKey& key, | |
| 38 platform::SymKey** out) { | |
| 39 *out = static_cast<platform::Key*>(key.handle())->AsSymKey(); | |
| 40 if (!*out) | |
| 41 return Status::ErrorUnexpectedKeyType(); | |
| 42 return Status::Success(); | |
| 43 } | |
| 44 | |
| 45 Status ToPlatformPublicKey(const blink::WebCryptoKey& key, | |
| 46 platform::PublicKey** out) { | |
| 47 *out = static_cast<platform::Key*>(key.handle())->AsPublicKey(); | |
| 48 if (!*out) | |
| 49 return Status::ErrorUnexpectedKeyType(); | |
| 50 return Status::Success(); | |
| 51 } | |
| 52 | |
| 53 Status ToPlatformPrivateKey(const blink::WebCryptoKey& key, | |
| 54 platform::PrivateKey** out) { | |
| 55 *out = static_cast<platform::Key*>(key.handle())->AsPrivateKey(); | |
| 56 if (!*out) | |
| 57 return Status::ErrorUnexpectedKeyType(); | |
| 58 return Status::Success(); | |
| 59 } | |
| 60 | |
| 61 const size_t kAesBlockSizeBytes = 16; | |
| 62 | |
| 63 Status EncryptDecryptAesCbc(EncryptOrDecrypt mode, | |
| 64 const blink::WebCryptoAlgorithm& algorithm, | |
| 65 const blink::WebCryptoKey& key, | |
| 66 const CryptoData& data, | |
| 67 blink::WebArrayBuffer* buffer) { | |
| 68 platform::SymKey* sym_key; | |
| 69 Status status = ToPlatformSymKey(key, &sym_key); | |
| 70 if (status.IsError()) | |
| 71 return status; | |
| 72 | |
| 73 const blink::WebCryptoAesCbcParams* params = algorithm.aesCbcParams(); | |
| 74 if (!params) | |
| 75 return Status::ErrorUnexpected(); | |
| 76 | |
| 77 CryptoData iv(params->iv().data(), params->iv().size()); | |
| 78 if (iv.byte_length() != kAesBlockSizeBytes) | |
| 79 return Status::ErrorIncorrectSizeAesCbcIv(); | |
| 80 | |
| 81 return platform::EncryptDecryptAesCbc(mode, sym_key, data, iv, buffer); | |
| 82 } | |
| 83 | |
| 84 Status EncryptDecryptAesGcm(EncryptOrDecrypt mode, | |
| 85 const blink::WebCryptoAlgorithm& algorithm, | |
| 86 const blink::WebCryptoKey& key, | |
| 87 const CryptoData& data, | |
| 88 blink::WebArrayBuffer* buffer) { | |
| 89 platform::SymKey* sym_key; | |
| 90 Status status = ToPlatformSymKey(key, &sym_key); | |
| 91 if (status.IsError()) | |
| 92 return status; | |
| 93 | |
| 94 const blink::WebCryptoAesGcmParams* params = algorithm.aesGcmParams(); | |
| 95 if (!params) | |
| 96 return Status::ErrorUnexpected(); | |
| 97 | |
| 98 unsigned int tag_length_bits = 128; | |
| 99 if (params->hasTagLengthBits()) | |
| 100 tag_length_bits = params->optionalTagLengthBits(); | |
| 101 | |
| 102 if (tag_length_bits != 32 && tag_length_bits != 64 && tag_length_bits != 96 && | |
| 103 tag_length_bits != 104 && tag_length_bits != 112 && | |
| 104 tag_length_bits != 120 && tag_length_bits != 128) | |
| 105 return Status::ErrorInvalidAesGcmTagLength(); | |
| 106 | |
| 107 return platform::EncryptDecryptAesGcm( | |
| 108 mode, | |
| 109 sym_key, | |
| 110 data, | |
| 111 CryptoData(params->iv()), | |
| 112 CryptoData(params->optionalAdditionalData()), | |
| 113 tag_length_bits, | |
| 114 buffer); | |
| 115 } | |
| 116 | |
| 117 Status EncryptRsaEsPkcs1v1_5(const blink::WebCryptoAlgorithm& algorithm, | |
| 118 const blink::WebCryptoKey& key, | |
| 119 const CryptoData& data, | |
| 120 blink::WebArrayBuffer* buffer) { | |
| 121 platform::PublicKey* public_key; | |
| 122 Status status = ToPlatformPublicKey(key, &public_key); | |
| 123 if (status.IsError()) | |
| 124 return status; | |
| 125 | |
| 126 // RSAES encryption does not support empty input | |
| 127 if (!data.byte_length()) | |
| 128 return Status::Error(); | |
| 129 | |
| 130 return platform::EncryptRsaEsPkcs1v1_5(public_key, data, buffer); | |
| 131 } | |
| 132 | |
| 133 Status DecryptRsaEsPkcs1v1_5(const blink::WebCryptoAlgorithm& algorithm, | |
| 134 const blink::WebCryptoKey& key, | |
| 135 const CryptoData& data, | |
| 136 blink::WebArrayBuffer* buffer) { | |
| 137 platform::PrivateKey* private_key; | |
| 138 Status status = ToPlatformPrivateKey(key, &private_key); | |
| 139 if (status.IsError()) | |
| 140 return status; | |
| 141 | |
| 142 // RSAES decryption does not support empty input | |
| 143 if (!data.byte_length()) | |
| 144 return Status::Error(); | |
| 145 | |
| 146 return platform::DecryptRsaEsPkcs1v1_5(private_key, data, buffer); | |
| 147 } | |
| 148 | |
| 149 Status SignHmac(const blink::WebCryptoAlgorithm& algorithm, | |
| 150 const blink::WebCryptoKey& key, | |
| 151 const CryptoData& data, | |
| 152 blink::WebArrayBuffer* buffer) { | |
| 153 platform::SymKey* sym_key; | |
| 154 Status status = ToPlatformSymKey(key, &sym_key); | |
| 155 if (status.IsError()) | |
| 156 return status; | |
| 157 | |
| 158 return platform::SignHmac( | |
| 159 sym_key, key.algorithm().hmacParams()->hash(), data, buffer); | |
| 160 } | |
| 161 | |
| 162 Status VerifyHmac(const blink::WebCryptoAlgorithm& algorithm, | |
| 163 const blink::WebCryptoKey& key, | |
| 164 const CryptoData& signature, | |
| 165 const CryptoData& data, | |
| 166 bool* signature_match) { | |
| 167 blink::WebArrayBuffer result; | |
| 168 Status status = SignHmac(algorithm, key, data, &result); | |
| 169 if (status.IsError()) | |
| 170 return status; | |
| 171 | |
| 172 // Do not allow verification of truncated MACs. | |
| 173 *signature_match = | |
| 174 result.byteLength() == signature.byte_length() && | |
| 175 crypto::SecureMemEqual( | |
| 176 result.data(), signature.bytes(), signature.byte_length()); | |
| 177 | |
| 178 return Status::Success(); | |
| 179 } | |
| 180 | |
| 181 Status SignRsaSsaPkcs1v1_5(const blink::WebCryptoAlgorithm& algorithm, | |
| 182 const blink::WebCryptoKey& key, | |
| 183 const CryptoData& data, | |
| 184 blink::WebArrayBuffer* buffer) { | |
| 185 platform::PrivateKey* private_key; | |
| 186 Status status = ToPlatformPrivateKey(key, &private_key); | |
| 187 if (status.IsError()) | |
| 188 return status; | |
| 189 | |
| 190 return platform::SignRsaSsaPkcs1v1_5( | |
| 191 private_key, key.algorithm().rsaHashedParams()->hash(), data, buffer); | |
| 192 } | |
| 193 | |
| 194 Status VerifyRsaSsaPkcs1v1_5(const blink::WebCryptoAlgorithm& algorithm, | |
| 195 const blink::WebCryptoKey& key, | |
| 196 const CryptoData& signature, | |
| 197 const CryptoData& data, | |
| 198 bool* signature_match) { | |
| 199 platform::PublicKey* public_key; | |
| 200 Status status = ToPlatformPublicKey(key, &public_key); | |
| 201 if (status.IsError()) | |
| 202 return status; | |
| 203 | |
| 204 return platform::VerifyRsaSsaPkcs1v1_5( | |
| 205 public_key, | |
| 206 key.algorithm().rsaHashedParams()->hash(), | |
| 207 signature, | |
| 208 data, | |
| 209 signature_match); | |
| 210 } | |
| 211 | |
| 212 Status ImportKeyRaw(const CryptoData& key_data, | |
| 213 const blink::WebCryptoAlgorithm& algorithm_or_null, | |
| 214 bool extractable, | |
| 215 blink::WebCryptoKeyUsageMask usage_mask, | |
| 216 blink::WebCryptoKey* key) { | |
| 217 if (algorithm_or_null.isNull()) | |
| 218 return Status::ErrorMissingAlgorithmImportRawKey(); | |
| 219 | |
| 220 switch (algorithm_or_null.id()) { | |
| 221 case blink::WebCryptoAlgorithmIdAesCtr: | |
| 222 case blink::WebCryptoAlgorithmIdAesCbc: | |
| 223 case blink::WebCryptoAlgorithmIdAesGcm: | |
| 224 case blink::WebCryptoAlgorithmIdAesKw: | |
| 225 if (!IsValidAesKeyLengthBytes(key_data.byte_length())) | |
| 226 return Status::Error(); | |
| 227 // Fallthrough intentional! | |
| 228 case blink::WebCryptoAlgorithmIdHmac: | |
| 229 return platform::ImportKeyRaw( | |
| 230 algorithm_or_null, key_data, extractable, usage_mask, key); | |
| 231 default: | |
| 232 return Status::ErrorUnsupported(); | |
| 233 } | |
| 234 } | |
| 235 | |
| 236 } // namespace | |
| 237 | |
| 238 void Init() { platform::Init(); } | |
| 239 | |
| 240 Status Encrypt(const blink::WebCryptoAlgorithm& algorithm, | |
| 241 const blink::WebCryptoKey& key, | |
| 242 const CryptoData& data, | |
| 243 blink::WebArrayBuffer* buffer) { | |
| 244 if (!KeyUsageAllows(key, blink::WebCryptoKeyUsageEncrypt)) | |
| 245 return Status::ErrorUnexpected(); | |
| 246 if (algorithm.id() != key.algorithm().id()) | |
| 247 return Status::ErrorUnexpected(); | |
| 248 | |
| 249 switch (algorithm.id()) { | |
| 250 case blink::WebCryptoAlgorithmIdAesCbc: | |
| 251 return EncryptDecryptAesCbc(ENCRYPT, algorithm, key, data, buffer); | |
| 252 case blink::WebCryptoAlgorithmIdAesGcm: | |
| 253 return EncryptDecryptAesGcm(ENCRYPT, algorithm, key, data, buffer); | |
| 254 case blink::WebCryptoAlgorithmIdRsaEsPkcs1v1_5: | |
| 255 return EncryptRsaEsPkcs1v1_5(algorithm, key, data, buffer); | |
| 256 default: | |
| 257 return Status::ErrorUnsupported(); | |
| 258 } | |
| 259 } | |
| 260 | |
| 261 Status Decrypt(const blink::WebCryptoAlgorithm& algorithm, | |
| 262 const blink::WebCryptoKey& key, | |
| 263 const CryptoData& data, | |
| 264 blink::WebArrayBuffer* buffer) { | |
| 265 if (!KeyUsageAllows(key, blink::WebCryptoKeyUsageDecrypt)) | |
| 266 return Status::ErrorUnexpected(); | |
| 267 if (algorithm.id() != key.algorithm().id()) | |
| 268 return Status::ErrorUnexpected(); | |
| 269 | |
| 270 switch (algorithm.id()) { | |
| 271 case blink::WebCryptoAlgorithmIdAesCbc: | |
| 272 return EncryptDecryptAesCbc(DECRYPT, algorithm, key, data, buffer); | |
| 273 case blink::WebCryptoAlgorithmIdAesGcm: | |
| 274 return EncryptDecryptAesGcm(DECRYPT, algorithm, key, data, buffer); | |
| 275 case blink::WebCryptoAlgorithmIdRsaEsPkcs1v1_5: | |
| 276 return DecryptRsaEsPkcs1v1_5(algorithm, key, data, buffer); | |
| 277 default: | |
| 278 return Status::ErrorUnsupported(); | |
| 279 } | |
| 280 } | |
| 281 | |
| 282 Status Digest(const blink::WebCryptoAlgorithm& algorithm, | |
| 283 const CryptoData& data, | |
| 284 blink::WebArrayBuffer* buffer) { | |
| 285 switch (algorithm.id()) { | |
| 286 case blink::WebCryptoAlgorithmIdSha1: | |
| 287 case blink::WebCryptoAlgorithmIdSha224: | |
| 288 case blink::WebCryptoAlgorithmIdSha256: | |
| 289 case blink::WebCryptoAlgorithmIdSha384: | |
| 290 case blink::WebCryptoAlgorithmIdSha512: | |
| 291 return platform::DigestSha(algorithm.id(), data, buffer); | |
| 292 default: | |
| 293 return Status::ErrorUnsupported(); | |
| 294 } | |
| 295 } | |
| 296 | |
| 297 Status GenerateSecretKey(const blink::WebCryptoAlgorithm& algorithm, | |
| 298 bool extractable, | |
| 299 blink::WebCryptoKeyUsageMask usage_mask, | |
| 300 blink::WebCryptoKey* key) { | |
| 301 unsigned int keylen_bytes = 0; | |
| 302 | |
| 303 // Get the secret key length in bytes from generation parameters. | |
| 304 // This resolves any defaults. | |
| 305 switch (algorithm.id()) { | |
| 306 case blink::WebCryptoAlgorithmIdAesCbc: | |
| 307 case blink::WebCryptoAlgorithmIdAesGcm: | |
| 308 case blink::WebCryptoAlgorithmIdAesKw: { | |
| 309 if (!IsValidAesKeyLengthBits(algorithm.aesKeyGenParams()->lengthBits())) | |
| 310 return Status::ErrorGenerateKeyLength(); | |
| 311 keylen_bytes = algorithm.aesKeyGenParams()->lengthBits() / 8; | |
| 312 break; | |
| 313 } | |
| 314 case blink::WebCryptoAlgorithmIdHmac: { | |
| 315 const blink::WebCryptoHmacKeyGenParams* params = | |
| 316 algorithm.hmacKeyGenParams(); | |
| 317 DCHECK(params); | |
| 318 if (params->hasLengthBytes()) { | |
| 319 keylen_bytes = params->optionalLengthBytes(); | |
| 320 } else { | |
| 321 keylen_bytes = ShaBlockSizeBytes(params->hash().id()); | |
| 322 if (keylen_bytes == 0) | |
| 323 return Status::ErrorUnsupported(); | |
| 324 } | |
| 325 break; | |
| 326 } | |
| 327 | |
| 328 default: | |
| 329 return Status::ErrorUnsupported(); | |
| 330 } | |
| 331 | |
| 332 // TODO(eroman): Is this correct? HMAC can import zero-length keys, so should | |
| 333 // probably be able to allowed to generate them too. | |
| 334 if (keylen_bytes == 0) | |
| 335 return Status::ErrorGenerateKeyLength(); | |
| 336 | |
| 337 return platform::GenerateSecretKey( | |
| 338 algorithm, extractable, usage_mask, keylen_bytes, key); | |
| 339 } | |
| 340 | |
| 341 Status GenerateKeyPair(const blink::WebCryptoAlgorithm& algorithm, | |
| 342 bool extractable, | |
| 343 blink::WebCryptoKeyUsageMask usage_mask, | |
| 344 blink::WebCryptoKey* public_key, | |
| 345 blink::WebCryptoKey* private_key) { | |
| 346 // TODO(padolph): Handle other asymmetric algorithm key generation. | |
| 347 switch (algorithm.paramsType()) { | |
| 348 case blink::WebCryptoAlgorithmParamsTypeRsaHashedKeyGenParams: | |
| 349 case blink::WebCryptoAlgorithmParamsTypeRsaKeyGenParams: { | |
| 350 const blink::WebCryptoRsaKeyGenParams* params = NULL; | |
| 351 blink::WebCryptoAlgorithm hash_or_null = | |
| 352 blink::WebCryptoAlgorithm::createNull(); | |
| 353 if (algorithm.rsaHashedKeyGenParams()) { | |
| 354 params = algorithm.rsaHashedKeyGenParams(); | |
| 355 hash_or_null = algorithm.rsaHashedKeyGenParams()->hash(); | |
| 356 } else { | |
| 357 params = algorithm.rsaKeyGenParams(); | |
| 358 } | |
| 359 | |
| 360 if (!params->modulusLengthBits()) | |
| 361 return Status::ErrorGenerateRsaZeroModulus(); | |
| 362 | |
| 363 CryptoData publicExponent(params->publicExponent()); | |
| 364 if (!publicExponent.byte_length()) | |
| 365 return Status::ErrorGenerateKeyPublicExponent(); | |
| 366 | |
| 367 return platform::GenerateRsaKeyPair(algorithm, | |
| 368 extractable, | |
| 369 usage_mask, | |
| 370 params->modulusLengthBits(), | |
| 371 publicExponent, | |
| 372 hash_or_null, | |
| 373 public_key, | |
| 374 private_key); | |
| 375 } | |
| 376 default: | |
| 377 return Status::ErrorUnsupported(); | |
| 378 } | |
| 379 } | |
| 380 | |
| 381 Status ImportKey(blink::WebCryptoKeyFormat format, | |
| 382 const CryptoData& key_data, | |
| 383 const blink::WebCryptoAlgorithm& algorithm_or_null, | |
| 384 bool extractable, | |
| 385 blink::WebCryptoKeyUsageMask usage_mask, | |
| 386 blink::WebCryptoKey* key) { | |
| 387 switch (format) { | |
| 388 case blink::WebCryptoKeyFormatRaw: | |
| 389 return ImportKeyRaw( | |
| 390 key_data, algorithm_or_null, extractable, usage_mask, key); | |
| 391 case blink::WebCryptoKeyFormatSpki: | |
| 392 return platform::ImportKeySpki( | |
| 393 algorithm_or_null, key_data, extractable, usage_mask, key); | |
| 394 case blink::WebCryptoKeyFormatPkcs8: | |
| 395 return platform::ImportKeyPkcs8( | |
| 396 algorithm_or_null, key_data, extractable, usage_mask, key); | |
| 397 case blink::WebCryptoKeyFormatJwk: | |
| 398 return ImportKeyJwk( | |
| 399 key_data, algorithm_or_null, extractable, usage_mask, key); | |
| 400 default: | |
| 401 return Status::ErrorUnsupported(); | |
| 402 } | |
| 403 } | |
| 404 | |
| 405 Status ExportKey(blink::WebCryptoKeyFormat format, | |
| 406 const blink::WebCryptoKey& key, | |
| 407 blink::WebArrayBuffer* buffer) { | |
| 408 if (!key.extractable()) | |
| 409 return Status::ErrorKeyNotExtractable(); | |
| 410 | |
| 411 switch (format) { | |
| 412 case blink::WebCryptoKeyFormatRaw: { | |
| 413 platform::SymKey* sym_key; | |
| 414 Status status = ToPlatformSymKey(key, &sym_key); | |
| 415 if (status.IsError()) | |
| 416 return status; | |
| 417 return platform::ExportKeyRaw(sym_key, buffer); | |
| 418 } | |
| 419 case blink::WebCryptoKeyFormatSpki: { | |
| 420 platform::PublicKey* public_key; | |
| 421 Status status = ToPlatformPublicKey(key, &public_key); | |
| 422 if (status.IsError()) | |
| 423 return status; | |
| 424 return platform::ExportKeySpki(public_key, buffer); | |
| 425 } | |
| 426 case blink::WebCryptoKeyFormatPkcs8: | |
| 427 case blink::WebCryptoKeyFormatJwk: | |
| 428 // TODO(eroman): | |
| 429 return Status::ErrorUnsupported(); | |
| 430 default: | |
| 431 return Status::ErrorUnsupported(); | |
| 432 } | |
| 433 } | |
| 434 | |
| 435 Status Sign(const blink::WebCryptoAlgorithm& algorithm, | |
| 436 const blink::WebCryptoKey& key, | |
| 437 const CryptoData& data, | |
| 438 blink::WebArrayBuffer* buffer) { | |
| 439 if (!KeyUsageAllows(key, blink::WebCryptoKeyUsageSign)) | |
| 440 return Status::ErrorUnexpected(); | |
| 441 if (algorithm.id() != key.algorithm().id()) | |
| 442 return Status::ErrorUnexpected(); | |
| 443 | |
| 444 switch (algorithm.id()) { | |
| 445 case blink::WebCryptoAlgorithmIdHmac: | |
| 446 return SignHmac(algorithm, key, data, buffer); | |
| 447 case blink::WebCryptoAlgorithmIdRsaSsaPkcs1v1_5: | |
| 448 return SignRsaSsaPkcs1v1_5(algorithm, key, data, buffer); | |
| 449 default: | |
| 450 return Status::ErrorUnsupported(); | |
| 451 } | |
| 452 } | |
| 453 | |
| 454 Status VerifySignature(const blink::WebCryptoAlgorithm& algorithm, | |
| 455 const blink::WebCryptoKey& key, | |
| 456 const CryptoData& signature, | |
| 457 const CryptoData& data, | |
| 458 bool* signature_match) { | |
| 459 if (!KeyUsageAllows(key, blink::WebCryptoKeyUsageVerify)) | |
| 460 return Status::ErrorUnexpected(); | |
| 461 if (algorithm.id() != key.algorithm().id()) | |
| 462 return Status::ErrorUnexpected(); | |
| 463 | |
| 464 if (!signature.byte_length()) { | |
| 465 // None of the algorithms generate valid zero-length signatures so this | |
| 466 // will necessarily fail verification. Early return to protect | |
| 467 // implementations from dealing with a NULL signature pointer. | |
| 468 *signature_match = false; | |
| 469 return Status::Success(); | |
| 470 } | |
| 471 | |
| 472 switch (algorithm.id()) { | |
| 473 case blink::WebCryptoAlgorithmIdHmac: | |
| 474 return VerifyHmac(algorithm, key, signature, data, signature_match); | |
| 475 case blink::WebCryptoAlgorithmIdRsaSsaPkcs1v1_5: | |
| 476 return VerifyRsaSsaPkcs1v1_5( | |
| 477 algorithm, key, signature, data, signature_match); | |
| 478 default: | |
| 479 return Status::ErrorUnsupported(); | |
| 480 } | |
| 481 } | |
| 482 | |
| 483 } // namespace webcrypto | |
| 484 | |
| 485 } // namespace content | |
| OLD | NEW |
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Chromium Code Reviews
Issue 188203003:
Move webcrypto to child/ and add support to worker_webkitplatformsupport. (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/src