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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 <vector> | |
| 6 #include <openssl/evp.h> | |
| 7 | |
| 8 #include "base/logging.h" | |
| 9 #include "base/numerics/safe_math.h" | |
| 10 #include "base/stl_util.h" | |
| 11 #include "content/child/webcrypto/crypto_data.h" | |
| 12 #include "content/child/webcrypto/openssl/aes_algorithm_openssl.h" | |
| 13 #include "content/child/webcrypto/openssl/key_openssl.h" | |
| 14 #include "content/child/webcrypto/openssl/util_openssl.h" | |
| 15 #include "content/child/webcrypto/status.h" | |
| 16 #include "crypto/openssl_util.h" | |
| 17 #include "crypto/scoped_openssl_types.h" | |
| 18 | |
| 19 namespace content { | |
| 20 | |
| 21 namespace webcrypto { | |
| 22 | |
| 23 namespace { | |
| 24 | |
| 25 const EVP_AEAD* GetAesKwAlgorithmFromKeySize(unsigned int key_size_bytes) { | |
| 26 switch (key_size_bytes) { | |
| 27 case 16: | |
| 28 return EVP_aead_aes_128_key_wrap(); | |
| 29 case 32: | |
| 30 return EVP_aead_aes_256_key_wrap(); | |
| 31 default: | |
| 32 return NULL; | |
| 33 } | |
| 34 } | |
| 35 | |
| 36 Status AesKwEncryptDecrypt(EncryptOrDecrypt mode, | |
| 37 const blink::WebCryptoAlgorithm& algorithm, | |
| 38 const blink::WebCryptoKey& key, | |
| 39 const CryptoData& data, | |
| 40 std::vector<uint8_t>* buffer) { | |
| 41 // These length checks are done so the returned error matches that of NSS | |
| 42 // implementation. Other than giving a more specific error, these are not | |
| 43 // required. | |
| 44 if ((mode == ENCRYPT && data.byte_length() < 16) || | |
| 45 (mode == DECRYPT && data.byte_length() < 24)) { | |
| 46 return Status::ErrorDataTooSmall(); | |
| 47 } | |
| 48 if (data.byte_length() % 8) | |
| 49 return Status::ErrorInvalidAesKwDataLength(); | |
| 50 | |
| 51 const std::vector<uint8_t>& raw_key = | |
| 52 SymKeyOpenSsl::Cast(key)->raw_key_data(); | |
| 53 | |
| 54 return AeadEncryptDecrypt(mode, raw_key, data, | |
| 55 8, // tag_length_bytes | |
| 56 CryptoData(), // iv | |
| 57 CryptoData(), // additional_data | |
| 58 GetAesKwAlgorithmFromKeySize(raw_key.size()), | |
| 59 buffer); | |
| 60 } | |
| 61 | |
| 62 class AesKwImplementation : public AesAlgorithm { | |
| 63 public: | |
| 64 AesKwImplementation() | |
| 65 : AesAlgorithm( | |
| 66 blink::WebCryptoKeyUsageWrapKey | blink::WebCryptoKeyUsageUnwrapKey, | |
| 67 "KW") {} | |
| 68 | |
| 69 Status Encrypt(const blink::WebCryptoAlgorithm& algorithm, | |
| 70 const blink::WebCryptoKey& key, | |
| 71 const CryptoData& data, | |
| 72 std::vector<uint8_t>* buffer) const override { | |
| 73 return AesKwEncryptDecrypt(ENCRYPT, algorithm, key, data, buffer); | |
| 74 } | |
| 75 | |
| 76 Status Decrypt(const blink::WebCryptoAlgorithm& algorithm, | |
| 77 const blink::WebCryptoKey& key, | |
| 78 const CryptoData& data, | |
| 79 std::vector<uint8_t>* buffer) const override { | |
| 80 return AesKwEncryptDecrypt(DECRYPT, algorithm, key, data, buffer); | |
| 81 } | |
| 82 }; | |
| 83 | |
| 84 } // namespace | |
| 85 | |
| 86 AlgorithmImplementation* CreatePlatformAesKwImplementation() { | |
| 87 return new AesKwImplementation; | |
| 88 } | |
| 89 | |
| 90 } // namespace webcrypto | |
| 91 | |
| 92 } // 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