42 lines
1.3 KiB
C++
42 lines
1.3 KiB
C++
// Copyright 2014 Google Inc. All rights reserved.
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//
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file or at
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// https://developers.google.com/open-source/licenses/bsd
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#include "media/base/encryptor_source.h"
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#include "media/base/aes_encryptor.h"
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namespace {
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// Generate 64bit IV by default.
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const size_t kDefaultIvSize = 8u;
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const uint8 kWidevineSystemId[] = {0xed, 0xef, 0x8b, 0xa9, 0x79, 0xd6,
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0x4a, 0xce, 0xa3, 0xc8, 0x27, 0xdc,
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0xd5, 0x1d, 0x21, 0xed};
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} // namespace
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namespace media {
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EncryptorSource::EncryptorSource()
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: iv_size_(kDefaultIvSize),
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key_system_id_(kWidevineSystemId,
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kWidevineSystemId + arraysize(kWidevineSystemId)) {}
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EncryptorSource::~EncryptorSource() {}
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scoped_ptr<AesCtrEncryptor> EncryptorSource::CreateEncryptor() {
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scoped_ptr<AesCtrEncryptor> encryptor(new AesCtrEncryptor());
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const bool initialized =
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iv_.empty() ? encryptor->InitializeWithRandomIv(key_, iv_size_)
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: encryptor->InitializeWithIv(key_, iv_);
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if (!initialized) {
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LOG(ERROR) << "Failed to the initialize encryptor.";
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return scoped_ptr<AesCtrEncryptor>();
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}
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return encryptor.Pass();
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}
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} // namespace media
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