2016-01-15 20:24:24 +00:00
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< li class = "navelem" > < a class = "el" href = "../../dir_39dc0668bd5a501998f94e8b4e546c71.html" > media< / a > < / li > < li class = "navelem" > < a class = "el" href = "../../dir_65f7acfa8cf3a5f1edc11faa2428b914.html" > formats< / a > < / li > < li class = "navelem" > < a class = "el" href = "../../dir_5039d854a18988ed1f1dbebc120ffbf7.html" > webm< / a > < / li > < / ul >
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< div class = "title" > encryptor.cc< / div > < / div >
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< div class = "fragment" > < div class = "line" > < a name = "l00001" > < / a > < span class = "lineno" > 1< / span >   < span class = "comment" > // Copyright 2015 Google Inc. All rights reserved.< / span > < / div >
< div class = "line" > < a name = "l00002" > < / a > < span class = "lineno" > 2< / span >   < span class = "comment" > //< / span > < / div >
< div class = "line" > < a name = "l00003" > < / a > < span class = "lineno" > 3< / span >   < span class = "comment" > // Use of this source code is governed by a BSD-style< / span > < / div >
< div class = "line" > < a name = "l00004" > < / a > < span class = "lineno" > 4< / span >   < span class = "comment" > // license that can be found in the LICENSE file or at< / span > < / div >
< div class = "line" > < a name = "l00005" > < / a > < span class = "lineno" > 5< / span >   < span class = "comment" > // https://developers.google.com/open-source/licenses/bsd< / span > < / div >
< div class = "line" > < a name = "l00006" > < / a > < span class = "lineno" > 6< / span >   < / div >
< div class = "line" > < a name = "l00007" > < / a > < span class = "lineno" > 7< / span >   < span class = "preprocessor" > #include " packager/media/formats/webm/encryptor.h" < / span > < / div >
< div class = "line" > < a name = "l00008" > < / a > < span class = "lineno" > 8< / span >   < / div >
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< div class = "line" > < a name = "l00009" > < / a > < span class = "lineno" > 9< / span >   < span class = "preprocessor" > #include " packager/media/base/buffer_writer.h" < / span > < / div >
< div class = "line" > < a name = "l00010" > < / a > < span class = "lineno" > 10< / span >   < span class = "preprocessor" > #include " packager/media/base/media_sample.h" < / span > < / div >
< div class = "line" > < a name = "l00011" > < / a > < span class = "lineno" > 11< / span >   < span class = "preprocessor" > #include " packager/media/formats/webm/webm_constants.h" < / span > < / div >
< div class = "line" > < a name = "l00012" > < / a > < span class = "lineno" > 12< / span >   < / div >
< div class = "line" > < a name = "l00013" > < / a > < span class = "lineno" > 13< / span >   < span class = "keyword" > namespace < / span > shaka {< / div >
< div class = "line" > < a name = "l00014" > < / a > < span class = "lineno" > 14< / span >   < span class = "keyword" > namespace < / span > media {< / div >
< div class = "line" > < a name = "l00015" > < / a > < span class = "lineno" > 15< / span >   < span class = "keyword" > namespace < / span > webm {< / div >
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< div class = "line" > < a name = "l00016" > < / a > < span class = "lineno" > 16< / span >   < / div >
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< div class = "line" > < a name = "l00017" > < / a > < span class = "lineno" > 17< / span >   Status UpdateTrackForEncryption(< span class = "keyword" > const< / span > std::vector< uint8_t> & key_id,< / div >
< div class = "line" > < a name = "l00018" > < / a > < span class = "lineno" > 18< / span >   mkvmuxer::Track* track) {< / div >
< div class = "line" > < a name = "l00019" > < / a > < span class = "lineno" > 19< / span >   DCHECK_EQ(track-> content_encoding_entries_size(), 0u);< / div >
< div class = "line" > < a name = "l00020" > < / a > < span class = "lineno" > 20< / span >   < / div >
< div class = "line" > < a name = "l00021" > < / a > < span class = "lineno" > 21< / span >   < span class = "keywordflow" > if< / span > (!track-> AddContentEncoding()) {< / div >
< div class = "line" > < a name = "l00022" > < / a > < span class = "lineno" > 22< / span >   < span class = "keywordflow" > return< / span > Status(error::INTERNAL_ERROR,< / div >
< div class = "line" > < a name = "l00023" > < / a > < span class = "lineno" > 23< / span >   < span class = "stringliteral" > " Could not add ContentEncoding to track." < / span > );< / div >
< div class = "line" > < a name = "l00024" > < / a > < span class = "lineno" > 24< / span >   }< / div >
< div class = "line" > < a name = "l00025" > < / a > < span class = "lineno" > 25< / span >   < / div >
< div class = "line" > < a name = "l00026" > < / a > < span class = "lineno" > 26< / span >   mkvmuxer::ContentEncoding* < span class = "keyword" > const< / span > encoding =< / div >
< div class = "line" > < a name = "l00027" > < / a > < span class = "lineno" > 27< / span >   track-> GetContentEncodingByIndex(0);< / div >
< div class = "line" > < a name = "l00028" > < / a > < span class = "lineno" > 28< / span >   < span class = "keywordflow" > if< / span > (!encoding) {< / div >
< div class = "line" > < a name = "l00029" > < / a > < span class = "lineno" > 29< / span >   < span class = "keywordflow" > return< / span > Status(error::INTERNAL_ERROR,< / div >
< div class = "line" > < a name = "l00030" > < / a > < span class = "lineno" > 30< / span >   < span class = "stringliteral" > " Could not add ContentEncoding to track." < / span > );< / div >
< div class = "line" > < a name = "l00031" > < / a > < span class = "lineno" > 31< / span >   }< / div >
< div class = "line" > < a name = "l00032" > < / a > < span class = "lineno" > 32< / span >   < / div >
< div class = "line" > < a name = "l00033" > < / a > < span class = "lineno" > 33< / span >   mkvmuxer::ContentEncAESSettings* < span class = "keyword" > const< / span > aes = encoding-> enc_aes_settings();< / div >
< div class = "line" > < a name = "l00034" > < / a > < span class = "lineno" > 34< / span >   < span class = "keywordflow" > if< / span > (!aes) {< / div >
< div class = "line" > < a name = "l00035" > < / a > < span class = "lineno" > 35< / span >   < span class = "keywordflow" > return< / span > Status(error::INTERNAL_ERROR,< / div >
< div class = "line" > < a name = "l00036" > < / a > < span class = "lineno" > 36< / span >   < span class = "stringliteral" > " Error getting ContentEncAESSettings." < / span > );< / div >
< div class = "line" > < a name = "l00037" > < / a > < span class = "lineno" > 37< / span >   }< / div >
< div class = "line" > < a name = "l00038" > < / a > < span class = "lineno" > 38< / span >   < span class = "keywordflow" > if< / span > (aes-> cipher_mode() != mkvmuxer::ContentEncAESSettings::kCTR) {< / div >
< div class = "line" > < a name = "l00039" > < / a > < span class = "lineno" > 39< / span >   < span class = "keywordflow" > return< / span > Status(error::INTERNAL_ERROR, < span class = "stringliteral" > " Cipher Mode is not CTR." < / span > );< / div >
< div class = "line" > < a name = "l00040" > < / a > < span class = "lineno" > 40< / span >   }< / div >
< div class = "line" > < a name = "l00041" > < / a > < span class = "lineno" > 41< / span >   < / div >
< div class = "line" > < a name = "l00042" > < / a > < span class = "lineno" > 42< / span >   < span class = "keywordflow" > if< / span > (!encoding-> SetEncryptionID(key_id.data(), key_id.size())) {< / div >
< div class = "line" > < a name = "l00043" > < / a > < span class = "lineno" > 43< / span >   < span class = "keywordflow" > return< / span > Status(error::INTERNAL_ERROR, < span class = "stringliteral" > " Error setting encryption ID." < / span > );< / div >
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< div class = "line" > < a name = "l00044" > < / a > < span class = "lineno" > 44< / span >   }< / div >
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< div class = "line" > < a name = "l00045" > < / a > < span class = "lineno" > 45< / span >   < span class = "keywordflow" > return< / span > Status::OK;< / div >
< div class = "line" > < a name = "l00046" > < / a > < span class = "lineno" > 46< / span >   }< / div >
< div class = "line" > < a name = "l00047" > < / a > < span class = "lineno" > 47< / span >   < / div >
< div class = "line" > < a name = "l00048" > < / a > < span class = "lineno" > 48< / span >   < span class = "keywordtype" > void< / span > UpdateFrameForEncryption(MediaSample* sample) {< / div >
< div class = "line" > < a name = "l00049" > < / a > < span class = "lineno" > 49< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > size_t< / span > sample_size = sample-> data_size();< / div >
< div class = "line" > < a name = "l00050" > < / a > < span class = "lineno" > 50< / span >   < span class = "keywordflow" > if< / span > (sample-> decrypt_config()) {< / div >
< div class = "line" > < a name = "l00051" > < / a > < span class = "lineno" > 51< / span >   < span class = "keyword" > auto< / span > * decrypt_config = sample-> decrypt_config();< / div >
< div class = "line" > < a name = "l00052" > < / a > < span class = "lineno" > 52< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > size_t< / span > iv_size = decrypt_config-> iv().size();< / div >
< div class = "line" > < a name = "l00053" > < / a > < span class = "lineno" > 53< / span >   DCHECK_EQ(iv_size, kWebMIvSize);< / div >
< div class = "line" > < a name = "l00054" > < / a > < span class = "lineno" > 54< / span >   < span class = "keywordflow" > if< / span > (!decrypt_config-> subsamples().empty()) {< / div >
< div class = "line" > < a name = "l00055" > < / a > < span class = "lineno" > 55< / span >   < span class = "keyword" > auto< / span > & subsamples = decrypt_config-> subsamples();< / div >
< div class = "line" > < a name = "l00056" > < / a > < span class = "lineno" > 56< / span >   < span class = "comment" > // Use partitioned subsample encryption: | signal_byte(3) | iv< / span > < / div >
< div class = "line" > < a name = "l00057" > < / a > < span class = "lineno" > 57< / span >   < span class = "comment" > // | num_partitions | partition_offset * n | enc_data |< / span > < / div >
< div class = "line" > < a name = "l00058" > < / a > < span class = "lineno" > 58< / span >   DCHECK_LT(subsamples.size(), kWebMMaxSubsamples);< / div >
< div class = "line" > < a name = "l00059" > < / a > < span class = "lineno" > 59< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > size_t< / span > num_partitions =< / div >
< div class = "line" > < a name = "l00060" > < / a > < span class = "lineno" > 60< / span >   2 * subsamples.size() - 1 -< / div >
< div class = "line" > < a name = "l00061" > < / a > < span class = "lineno" > 61< / span >   (subsamples.back().cipher_bytes == 0 ? 1 : 0);< / div >
< div class = "line" > < a name = "l00062" > < / a > < span class = "lineno" > 62< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > size_t< / span > header_size = kWebMSignalByteSize + iv_size +< / div >
< div class = "line" > < a name = "l00063" > < / a > < span class = "lineno" > 63< / span >   kWebMNumPartitionsSize +< / div >
< div class = "line" > < a name = "l00064" > < / a > < span class = "lineno" > 64< / span >   (kWebMPartitionOffsetSize * num_partitions);< / div >
< div class = "line" > < a name = "l00065" > < / a > < span class = "lineno" > 65< / span >   sample-> resize_data(header_size + sample_size);< / div >
< div class = "line" > < a name = "l00066" > < / a > < span class = "lineno" > 66< / span >   uint8_t* sample_data = sample-> writable_data();< / div >
< div class = "line" > < a name = "l00067" > < / a > < span class = "lineno" > 67< / span >   memmove(sample_data + header_size, sample_data, sample_size);< / div >
< div class = "line" > < a name = "l00068" > < / a > < span class = "lineno" > 68< / span >   sample_data[0] = kWebMEncryptedSignal | kWebMPartitionedSignal;< / div >
< div class = "line" > < a name = "l00069" > < / a > < span class = "lineno" > 69< / span >   memcpy(sample_data + kWebMSignalByteSize, decrypt_config-> iv().data(),< / div >
< div class = "line" > < a name = "l00070" > < / a > < span class = "lineno" > 70< / span >   iv_size);< / div >
< div class = "line" > < a name = "l00071" > < / a > < span class = "lineno" > 71< / span >   sample_data[kWebMSignalByteSize + kWebMIvSize] =< / div >
< div class = "line" > < a name = "l00072" > < / a > < span class = "lineno" > 72< / span >   < span class = "keyword" > static_cast< < / span > uint8_t< span class = "keyword" > > < / span > (num_partitions);< / div >
< div class = "line" > < a name = "l00073" > < / a > < span class = "lineno" > 73< / span >   < / div >
< div class = "line" > < a name = "l00074" > < / a > < span class = "lineno" > 74< / span >   BufferWriter offsets_buffer;< / div >
< div class = "line" > < a name = "l00075" > < / a > < span class = "lineno" > 75< / span >   uint32_t partition_offset = 0;< / div >
< div class = "line" > < a name = "l00076" > < / a > < span class = "lineno" > 76< / span >   < span class = "keywordflow" > for< / span > (< span class = "keywordtype" > size_t< / span > i = 0; i < subsamples.size() - 1; ++i) {< / div >
< div class = "line" > < a name = "l00077" > < / a > < span class = "lineno" > 77< / span >   partition_offset += subsamples[i].clear_bytes;< / div >
< div class = "line" > < a name = "l00078" > < / a > < span class = "lineno" > 78< / span >   offsets_buffer.AppendInt(partition_offset);< / div >
< div class = "line" > < a name = "l00079" > < / a > < span class = "lineno" > 79< / span >   partition_offset += subsamples[i].cipher_bytes;< / div >
< div class = "line" > < a name = "l00080" > < / a > < span class = "lineno" > 80< / span >   offsets_buffer.AppendInt(partition_offset);< / div >
< div class = "line" > < a name = "l00081" > < / a > < span class = "lineno" > 81< / span >   }< / div >
< div class = "line" > < a name = "l00082" > < / a > < span class = "lineno" > 82< / span >   < span class = "comment" > // Add another partition between the clear bytes and cipher bytes if< / span > < / div >
< div class = "line" > < a name = "l00083" > < / a > < span class = "lineno" > 83< / span >   < span class = "comment" > // cipher bytes is not zero.< / span > < / div >
< div class = "line" > < a name = "l00084" > < / a > < span class = "lineno" > 84< / span >   < span class = "keywordflow" > if< / span > (subsamples.back().cipher_bytes != 0) {< / div >
< div class = "line" > < a name = "l00085" > < / a > < span class = "lineno" > 85< / span >   partition_offset += subsamples.back().clear_bytes;< / div >
< div class = "line" > < a name = "l00086" > < / a > < span class = "lineno" > 86< / span >   offsets_buffer.AppendInt(partition_offset);< / div >
< div class = "line" > < a name = "l00087" > < / a > < span class = "lineno" > 87< / span >   }< / div >
< div class = "line" > < a name = "l00088" > < / a > < span class = "lineno" > 88< / span >   DCHECK_EQ(num_partitions * kWebMPartitionOffsetSize,< / div >
< div class = "line" > < a name = "l00089" > < / a > < span class = "lineno" > 89< / span >   offsets_buffer.Size());< / div >
< div class = "line" > < a name = "l00090" > < / a > < span class = "lineno" > 90< / span >   memcpy(sample_data + kWebMSignalByteSize + kWebMIvSize +< / div >
< div class = "line" > < a name = "l00091" > < / a > < span class = "lineno" > 91< / span >   kWebMNumPartitionsSize,< / div >
< div class = "line" > < a name = "l00092" > < / a > < span class = "lineno" > 92< / span >   offsets_buffer.Buffer(), offsets_buffer.Size());< / div >
< div class = "line" > < a name = "l00093" > < / a > < span class = "lineno" > 93< / span >   } < span class = "keywordflow" > else< / span > {< / div >
< div class = "line" > < a name = "l00094" > < / a > < span class = "lineno" > 94< / span >   < span class = "comment" > // Use whole-frame encryption: | signal_byte(1) | iv | enc_data |< / span > < / div >
< div class = "line" > < a name = "l00095" > < / a > < span class = "lineno" > 95< / span >   sample-> resize_data(sample_size + iv_size + kWebMSignalByteSize);< / div >
< div class = "line" > < a name = "l00096" > < / a > < span class = "lineno" > 96< / span >   uint8_t* sample_data = sample-> writable_data();< / div >
< div class = "line" > < a name = "l00097" > < / a > < span class = "lineno" > 97< / span >   < / div >
< div class = "line" > < a name = "l00098" > < / a > < span class = "lineno" > 98< / span >   < span class = "comment" > // First move the sample data to after the IV; then write the IV and< / span > < / div >
< div class = "line" > < a name = "l00099" > < / a > < span class = "lineno" > 99< / span >   < span class = "comment" > // signal byte.< / span > < / div >
< div class = "line" > < a name = "l00100" > < / a > < span class = "lineno" > 100< / span >   memmove(sample_data + iv_size + kWebMSignalByteSize, sample_data,< / div >
< div class = "line" > < a name = "l00101" > < / a > < span class = "lineno" > 101< / span >   sample_size);< / div >
< div class = "line" > < a name = "l00102" > < / a > < span class = "lineno" > 102< / span >   sample_data[0] = kWebMEncryptedSignal;< / div >
< div class = "line" > < a name = "l00103" > < / a > < span class = "lineno" > 103< / span >   memcpy(sample_data + 1, decrypt_config-> iv().data(), iv_size);< / div >
< div class = "line" > < a name = "l00104" > < / a > < span class = "lineno" > 104< / span >   }< / div >
< div class = "line" > < a name = "l00105" > < / a > < span class = "lineno" > 105< / span >   } < span class = "keywordflow" > else< / span > {< / div >
< div class = "line" > < a name = "l00106" > < / a > < span class = "lineno" > 106< / span >   < span class = "comment" > // Clear sample: | signal_byte(0) | data |< / span > < / div >
< div class = "line" > < a name = "l00107" > < / a > < span class = "lineno" > 107< / span >   sample-> resize_data(sample_size + 1);< / div >
< div class = "line" > < a name = "l00108" > < / a > < span class = "lineno" > 108< / span >   uint8_t* sample_data = sample-> writable_data();< / div >
< div class = "line" > < a name = "l00109" > < / a > < span class = "lineno" > 109< / span >   memmove(sample_data + 1, sample_data, sample_size);< / div >
< div class = "line" > < a name = "l00110" > < / a > < span class = "lineno" > 110< / span >   sample_data[0] = 0x00;< / div >
< div class = "line" > < a name = "l00111" > < / a > < span class = "lineno" > 111< / span >   }< / div >
< div class = "line" > < a name = "l00112" > < / a > < span class = "lineno" > 112< / span >   }< / div >
< div class = "line" > < a name = "l00113" > < / a > < span class = "lineno" > 113< / span >   < / div >
< div class = "line" > < a name = "l00114" > < / a > < span class = "lineno" > 114< / span >   } < span class = "comment" > // namespace webm< / span > < / div >
< div class = "line" > < a name = "l00115" > < / a > < span class = "lineno" > 115< / span >   } < span class = "comment" > // namespace media< / span > < / div >
< div class = "line" > < a name = "l00116" > < / a > < span class = "lineno" > 116< / span >   } < span class = "comment" > // namespace shaka< / span > < / div >
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