| // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "cobalt/media/base/decrypt_config.h" |
| |
| #include "base/logging.h" |
| #include "base/memory/ptr_util.h" |
| #include "base/strings/string_number_conversions.h" |
| #include "starboard/types.h" |
| |
| namespace cobalt { |
| namespace media { |
| |
| namespace { |
| |
| const char* EncryptionModeAsString(EncryptionMode mode) { |
| switch (mode) { |
| case EncryptionMode::kUnencrypted: |
| return "Unencrypted"; |
| case EncryptionMode::kCenc: |
| return "CENC"; |
| case EncryptionMode::kCbcs: |
| return "CBCS"; |
| default: |
| return "Unknown"; |
| } |
| } |
| |
| } // namespace |
| |
| // static |
| std::unique_ptr<DecryptConfig> DecryptConfig::CreateCencConfig( |
| const std::string& key_id, |
| const std::string& iv, |
| const std::vector<SubsampleEntry>& subsamples) { |
| return std::make_unique<DecryptConfig>(EncryptionMode::kCenc, key_id, iv, |
| subsamples, base::nullopt); |
| } |
| |
| // static |
| std::unique_ptr<DecryptConfig> DecryptConfig::CreateCbcsConfig( |
| const std::string& key_id, |
| const std::string& iv, |
| const std::vector<SubsampleEntry>& subsamples, |
| base::Optional<EncryptionPattern> encryption_pattern) { |
| return std::make_unique<DecryptConfig>(EncryptionMode::kCbcs, key_id, iv, |
| subsamples, |
| std::move(encryption_pattern)); |
| } |
| |
| DecryptConfig::DecryptConfig( |
| const EncryptionMode& encryption_mode, |
| const std::string& key_id, |
| const std::string& iv, |
| const std::vector<SubsampleEntry>& subsamples, |
| base::Optional<EncryptionPattern> encryption_pattern) |
| : encryption_mode_(encryption_mode), |
| key_id_(key_id), |
| iv_(iv), |
| subsamples_(subsamples), |
| encryption_pattern_(std::move(encryption_pattern)) { |
| // Unencrypted blocks should not have a DecryptConfig. |
| DCHECK_NE(encryption_mode_, EncryptionMode::kUnencrypted); |
| CHECK_GT(key_id_.size(), 0u); |
| CHECK_EQ(iv_.size(), static_cast<size_t>(DecryptConfig::kDecryptionKeySize)); |
| |
| // Pattern not allowed for non-'cbcs' modes. |
| DCHECK(encryption_mode_ == EncryptionMode::kCbcs || !encryption_pattern_); |
| } |
| |
| DecryptConfig::~DecryptConfig() {} |
| |
| bool DecryptConfig::HasPattern() const { |
| return encryption_pattern_.has_value(); |
| } |
| |
| bool DecryptConfig::Matches(const DecryptConfig& config) const { |
| if (key_id() != config.key_id() || iv() != config.iv() || |
| subsamples().size() != config.subsamples().size() || |
| encryption_mode_ != config.encryption_mode_ || |
| encryption_pattern_ != config.encryption_pattern_) { |
| return false; |
| } |
| |
| for (size_t i = 0; i < subsamples().size(); ++i) { |
| if ((subsamples()[i].clear_bytes != config.subsamples()[i].clear_bytes) || |
| (subsamples()[i].cypher_bytes != config.subsamples()[i].cypher_bytes)) { |
| return false; |
| } |
| } |
| |
| return true; |
| } |
| |
| std::ostream& DecryptConfig::Print(std::ostream& os) const { |
| os << "key_id:'" << base::HexEncode(key_id_.data(), key_id_.size()) << "'" |
| << " iv:'" << base::HexEncode(iv_.data(), iv_.size()) << "'" |
| << " mode:" << EncryptionModeAsString(encryption_mode_); |
| |
| if (encryption_pattern_) { |
| os << " pattern:" << encryption_pattern_->crypt_byte_block() << ":" |
| << encryption_pattern_->skip_byte_block(); |
| } |
| |
| os << " subsamples:["; |
| for (size_t i = 0; i < subsamples_.size(); ++i) { |
| os << "(clear:" << subsamples_[i].clear_bytes |
| << ", cypher:" << subsamples_[i].cypher_bytes << ")"; |
| } |
| os << "]"; |
| return os; |
| } |
| |
| } // namespace media |
| } // namespace cobalt |