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1 // Copyright 2014 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "media/cast/common/transport_encryption_handler.h" | 5 #include "media/cast/common/transport_encryption_handler.h" |
6 | 6 |
7 #include "base/logging.h" | 7 #include "base/logging.h" |
8 #include "crypto/encryptor.h" | 8 #include "crypto/encryptor.h" |
9 #include "crypto/symmetric_key.h" | 9 #include "crypto/symmetric_key.h" |
10 #include "media/cast/net/cast_transport_defines.h" | 10 #include "media/cast/net/cast_transport_defines.h" |
11 | 11 |
12 namespace { | 12 namespace { |
13 | 13 |
14 // Crypto. | 14 // Crypto. |
15 const size_t kAesBlockSize = 16; | 15 const size_t kAesBlockSize = 16; |
16 const size_t kAesKeySize = 16; | 16 const size_t kAesKeySize = 16; |
17 | 17 |
18 std::string GetAesNonce(uint32 frame_id, const std::string& iv_mask) { | 18 std::string GetAesNonce(uint32_t frame_id, const std::string& iv_mask) { |
19 std::string aes_nonce(kAesBlockSize, 0); | 19 std::string aes_nonce(kAesBlockSize, 0); |
20 | 20 |
21 // Serializing frame_id in big-endian order (aes_nonce[8] is the most | 21 // Serializing frame_id in big-endian order (aes_nonce[8] is the most |
22 // significant byte of frame_id). | 22 // significant byte of frame_id). |
23 aes_nonce[11] = frame_id & 0xff; | 23 aes_nonce[11] = frame_id & 0xff; |
24 aes_nonce[10] = (frame_id >> 8) & 0xff; | 24 aes_nonce[10] = (frame_id >> 8) & 0xff; |
25 aes_nonce[9] = (frame_id >> 16) & 0xff; | 25 aes_nonce[9] = (frame_id >> 16) & 0xff; |
26 aes_nonce[8] = (frame_id >> 24) & 0xff; | 26 aes_nonce[8] = (frame_id >> 24) & 0xff; |
27 | 27 |
28 for (size_t i = 0; i < kAesBlockSize; ++i) { | 28 for (size_t i = 0; i < kAesBlockSize; ++i) { |
(...skipping 25 matching lines...) Expand all Loading... |
54 } else if (aes_iv_mask.size() != 0 || aes_key.size() != 0) { | 54 } else if (aes_iv_mask.size() != 0 || aes_key.size() != 0) { |
55 DCHECK_EQ(aes_iv_mask.size(), 0u) | 55 DCHECK_EQ(aes_iv_mask.size(), 0u) |
56 << "Invalid Crypto configuration: aes_iv_mask.size"; | 56 << "Invalid Crypto configuration: aes_iv_mask.size"; |
57 DCHECK_EQ(aes_key.size(), 0u) | 57 DCHECK_EQ(aes_key.size(), 0u) |
58 << "Invalid Crypto configuration: aes_key.size"; | 58 << "Invalid Crypto configuration: aes_key.size"; |
59 return false; | 59 return false; |
60 } | 60 } |
61 return true; | 61 return true; |
62 } | 62 } |
63 | 63 |
64 bool TransportEncryptionHandler::Encrypt(uint32 frame_id, | 64 bool TransportEncryptionHandler::Encrypt(uint32_t frame_id, |
65 const base::StringPiece& data, | 65 const base::StringPiece& data, |
66 std::string* encrypted_data) { | 66 std::string* encrypted_data) { |
67 if (!is_activated_) | 67 if (!is_activated_) |
68 return false; | 68 return false; |
69 if (!encryptor_->SetCounter(GetAesNonce(frame_id, iv_mask_))) { | 69 if (!encryptor_->SetCounter(GetAesNonce(frame_id, iv_mask_))) { |
70 NOTREACHED() << "Failed to set counter"; | 70 NOTREACHED() << "Failed to set counter"; |
71 return false; | 71 return false; |
72 } | 72 } |
73 if (!encryptor_->Encrypt(data, encrypted_data)) { | 73 if (!encryptor_->Encrypt(data, encrypted_data)) { |
74 NOTREACHED() << "Encrypt error"; | 74 NOTREACHED() << "Encrypt error"; |
75 return false; | 75 return false; |
76 } | 76 } |
77 return true; | 77 return true; |
78 } | 78 } |
79 | 79 |
80 bool TransportEncryptionHandler::Decrypt(uint32 frame_id, | 80 bool TransportEncryptionHandler::Decrypt(uint32_t frame_id, |
81 const base::StringPiece& ciphertext, | 81 const base::StringPiece& ciphertext, |
82 std::string* plaintext) { | 82 std::string* plaintext) { |
83 if (!is_activated_) { | 83 if (!is_activated_) { |
84 return false; | 84 return false; |
85 } | 85 } |
86 if (!encryptor_->SetCounter(GetAesNonce(frame_id, iv_mask_))) { | 86 if (!encryptor_->SetCounter(GetAesNonce(frame_id, iv_mask_))) { |
87 NOTREACHED() << "Failed to set counter"; | 87 NOTREACHED() << "Failed to set counter"; |
88 return false; | 88 return false; |
89 } | 89 } |
90 if (!encryptor_->Decrypt(ciphertext, plaintext)) { | 90 if (!encryptor_->Decrypt(ciphertext, plaintext)) { |
91 VLOG(1) << "Decryption error"; | 91 VLOG(1) << "Decryption error"; |
92 return false; | 92 return false; |
93 } | 93 } |
94 return true; | 94 return true; |
95 } | 95 } |
96 | 96 |
97 } // namespace cast | 97 } // namespace cast |
98 } // namespace media | 98 } // namespace media |
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