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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span>&#160;<span class="comment">// Copyright 2014 The Chromium Authors. All rights reserved.</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span>&#160;<span class="comment">// Use of this source code is governed by a BSD-style license that can be</span></div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span>&#160;<span class="comment">// found in the LICENSE file.</span></div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span>&#160;</div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span>&#160;<span class="preprocessor">#include &quot;packager/media/formats/webm/webm_crypto_helpers.h&quot;</span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span>&#160;</div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span>&#160;<span class="preprocessor">#include &quot;packager/base/logging.h&quot;</span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span>&#160;<span class="preprocessor">#include &quot;packager/base/sys_byteorder.h&quot;</span></div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span>&#160;<span class="preprocessor">#include &quot;packager/media/base/buffer_reader.h&quot;</span></div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span>&#160;<span class="preprocessor">#include &quot;packager/media/formats/webm/webm_constants.h&quot;</span></div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span>&#160;</div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span>&#160;<span class="keyword">namespace </span><a class="code" href="../../d8/daf/namespaceshaka.html">shaka</a> {</div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span>&#160;<span class="keyword">namespace </span>media {</div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span>&#160;<span class="keyword">namespace </span>{</div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span>&#160;</div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span>&#160;<span class="comment">// Generates a 16 byte CTR counter block. The CTR counter block format is a</span></div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span>&#160;<span class="comment">// CTR IV appended with a CTR block counter. |iv| is an 8 byte CTR IV.</span></div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span>&#160;<span class="comment">// |iv_size| is the size of |iv| in btyes. Returns a string of</span></div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span>&#160;<span class="comment">// kDecryptionKeySize bytes.</span></div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span>&#160;std::vector&lt;uint8_t&gt; GenerateWebMCounterBlock(<span class="keyword">const</span> uint8_t* iv, <span class="keywordtype">int</span> iv_size) {</div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span>&#160; std::vector&lt;uint8_t&gt; counter_block(iv, iv + iv_size);</div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span>&#160; counter_block.insert(counter_block.end(),</div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span>&#160; <a class="code" href="../../de/d49/classshaka_1_1media_1_1DecryptConfig.html#afa140203b87d3e46d5fd94b231734f53">DecryptConfig::kDecryptionKeySize</a> - iv_size, 0);</div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span>&#160; <span class="keywordflow">return</span> counter_block;</div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span>&#160;}</div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span>&#160;</div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span>&#160;} <span class="comment">// namespace anonymous</span></div><div clas
<div class="ttc" id="classshaka_1_1media_1_1DecryptConfig_html_afa140203b87d3e46d5fd94b231734f53"><div class="ttname"><a href="../../de/d49/classshaka_1_1media_1_1DecryptConfig.html#afa140203b87d3e46d5fd94b231734f53">shaka::media::DecryptConfig::kDecryptionKeySize</a></div><div class="ttdeci">static const size_t kDecryptionKeySize</div><div class="ttdoc">Keys are always 128 bits. </div><div class="ttdef"><b>Definition:</b> <a href="../../df/dad/decrypt__config_8h_source.html#l00043">decrypt_config.h:43</a></div></div>
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