460 lines
18 KiB
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460 lines
18 KiB
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Class: Rex::Exploit::ViewState
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— Documentation by YARD 0.9.37
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<span class='title'><span class='object_link'><a href="../../Rex.html" title="Rex (module)">Rex</a></span></span> » <span class='title'><span class='object_link'><a href="../Exploit.html" title="Rex::Exploit (module)">Exploit</a></span></span>
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»
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<span class="title">ViewState</span>
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<div id="content"><h1>Class: Rex::Exploit::ViewState
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<dt>Inherits:</dt>
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<dd>
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<span class="inheritName">Object</span>
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<ul class="fullTree">
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<li>Object</li>
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<li class="next">Rex::Exploit::ViewState</li>
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</ul>
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<a href="#" class="inheritanceTree">show all</a>
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<dl>
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<dt>Defined in:</dt>
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<dd>lib/rex/exploit/view_state.rb</dd>
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<strong class="classes">Classes:</strong> <span class='object_link'><a href="ViewState/Error.html" title="Rex::Exploit::ViewState::Error (class)">Error</a></span>
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<h2>
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Class Method Summary
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<a href="#decode_viewstate-class_method" title="decode_viewstate (class method)">.<strong>decode_viewstate</strong>(encoded_viewstate, algo: 'sha1') ⇒ Object </a>
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<a href="#generate_viewstate-class_method" title="generate_viewstate (class method)">.<strong>generate_viewstate</strong>(data, extra: '', algo: 'sha1', key: '') ⇒ Object </a>
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<span class="summary_signature">
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<a href="#generate_viewstate_hmac-class_method" title="generate_viewstate_hmac (class method)">.<strong>generate_viewstate_hmac</strong>(data, algo: 'sha1', key: '') ⇒ Object </a>
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<a href="#is_viewstate_valid%3F-class_method" title="is_viewstate_valid? (class method)">.<strong>is_viewstate_valid?</strong>(encoded_viewstate, extra: '', algo: 'sha1', key: '') ⇒ Boolean </a>
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(also: can_sign_viewstate?)
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<div id="class_method_details" class="method_details_list">
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<h2>Class Method Details</h2>
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<div class="method_details first">
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<h3 class="signature first" id="decode_viewstate-class_method">
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.<strong>decode_viewstate</strong>(encoded_viewstate, algo: 'sha1') ⇒ <tt>Object</tt>
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28</pre>
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</td>
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<td>
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<pre class="code"><span class="info file"># File 'lib/rex/exploit/view_state.rb', line 9</span>
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<span class='kw'>def</span> <span class='kw'>self</span><span class='period'>.</span><span class='id identifier rubyid_decode_viewstate'>decode_viewstate</span><span class='lparen'>(</span><span class='id identifier rubyid_encoded_viewstate'>encoded_viewstate</span><span class='comma'>,</span> <span class='label'>algo:</span> <span class='tstring'><span class='tstring_beg'>'</span><span class='tstring_content'>sha1</span><span class='tstring_end'>'</span></span><span class='rparen'>)</span>
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<span class='id identifier rubyid_viewstate'>viewstate</span> <span class='op'>=</span> <span class='const'><span class='object_link'><a href="../../Rex.html" title="Rex (module)">Rex</a></span></span><span class='op'>::</span><span class='const'>Text</span><span class='period'>.</span><span class='id identifier rubyid_decode_base64'>decode_base64</span><span class='lparen'>(</span><span class='id identifier rubyid_encoded_viewstate'>encoded_viewstate</span><span class='rparen'>)</span>
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<span class='kw'>unless</span> <span class='const'><span class='object_link'><a href="../../Rex.html" title="Rex (module)">Rex</a></span></span><span class='op'>::</span><span class='const'>Text</span><span class='period'>.</span><span class='id identifier rubyid_encode_base64'>encode_base64</span><span class='lparen'>(</span><span class='id identifier rubyid_viewstate'>viewstate</span><span class='rparen'>)</span> <span class='op'>==</span> <span class='id identifier rubyid_encoded_viewstate'>encoded_viewstate</span>
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<span class='id identifier rubyid_raise'>raise</span> <span class='const'><span class='object_link'><a href="ViewState/Error.html" title="Rex::Exploit::ViewState::Error (class)">Error</a></span></span><span class='period'>.</span><span class='id identifier rubyid_new'>new</span><span class='lparen'>(</span><span class='tstring'><span class='tstring_beg'>'</span><span class='tstring_content'>Could not decode ViewState</span><span class='tstring_end'>'</span></span><span class='rparen'>)</span>
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<span class='kw'>end</span>
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<span class='id identifier rubyid_hmac_len'>hmac_len</span> <span class='op'>=</span> <span class='const'>OpenSSL</span><span class='op'>::</span><span class='const'>Digest</span><span class='period'>.</span><span class='id identifier rubyid_new'>new</span><span class='lparen'>(</span><span class='id identifier rubyid_algo'>algo</span><span class='rparen'>)</span><span class='period'>.</span><span class='id identifier rubyid_digest_length'>digest_length</span>
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<span class='kw'>if</span> <span class='lparen'>(</span><span class='id identifier rubyid_data'>data</span> <span class='op'>=</span> <span class='id identifier rubyid_viewstate'>viewstate</span><span class='lbracket'>[</span><span class='int'>0</span><span class='op'>...</span><span class='op'>-</span><span class='id identifier rubyid_hmac_len'>hmac_len</span><span class='rbracket'>]</span><span class='rparen'>)</span><span class='period'>.</span><span class='id identifier rubyid_empty?'>empty?</span>
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<span class='id identifier rubyid_data'>data</span> <span class='op'>=</span> <span class='kw'>nil</span>
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<span class='kw'>end</span>
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<span class='id identifier rubyid_hmac'>hmac</span> <span class='op'>=</span> <span class='id identifier rubyid_viewstate'>viewstate</span><span class='lbracket'>[</span><span class='op'>-</span><span class='id identifier rubyid_hmac_len'>hmac_len</span><span class='op'>..</span><span class='op'>-</span><span class='int'>1</span><span class='rbracket'>]</span>
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<span class='kw'>unless</span> <span class='id identifier rubyid_hmac'>hmac</span><span class='op'>&.</span><span class='id identifier rubyid_length'>length</span> <span class='op'>==</span> <span class='id identifier rubyid_hmac_len'>hmac_len</span>
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<span class='id identifier rubyid_raise'>raise</span> <span class='const'><span class='object_link'><a href="ViewState/Error.html" title="Rex::Exploit::ViewState::Error (class)">Error</a></span></span><span class='period'>.</span><span class='id identifier rubyid_new'>new</span><span class='lparen'>(</span><span class='tstring'><span class='tstring_beg'>'</span><span class='tstring_content'>Could not decode ViewState</span><span class='tstring_end'>'</span></span><span class='rparen'>)</span>
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<span class='kw'>end</span>
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<span class='lbrace'>{</span> <span class='label'>data:</span> <span class='id identifier rubyid_data'>data</span><span class='comma'>,</span> <span class='label'>hmac:</span> <span class='id identifier rubyid_hmac'>hmac</span> <span class='rbrace'>}</span>
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<span class='kw'>end</span></pre>
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</table>
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</div>
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<div class="method_details ">
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<h3 class="signature " id="generate_viewstate-class_method">
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.<strong>generate_viewstate</strong>(data, extra: '', algo: 'sha1', key: '') ⇒ <tt>Object</tt>
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</h3><table class="source_code">
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<tr>
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<pre class="lines">
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36</pre>
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</td>
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<td>
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<pre class="code"><span class="info file"># File 'lib/rex/exploit/view_state.rb', line 30</span>
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<span class='kw'>def</span> <span class='kw'>self</span><span class='period'>.</span><span class='id identifier rubyid_generate_viewstate'>generate_viewstate</span><span class='lparen'>(</span><span class='id identifier rubyid_data'>data</span><span class='comma'>,</span> <span class='label'>extra:</span> <span class='tstring'><span class='tstring_beg'>'</span><span class='tstring_end'>'</span></span><span class='comma'>,</span> <span class='label'>algo:</span> <span class='tstring'><span class='tstring_beg'>'</span><span class='tstring_content'>sha1</span><span class='tstring_end'>'</span></span><span class='comma'>,</span> <span class='label'>key:</span> <span class='tstring'><span class='tstring_beg'>'</span><span class='tstring_end'>'</span></span><span class='rparen'>)</span>
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<span class='comment'># Generate ViewState HMAC from known values and validation key
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</span> <span class='id identifier rubyid_hmac'>hmac</span> <span class='op'>=</span> <span class='id identifier rubyid_generate_viewstate_hmac'>generate_viewstate_hmac</span><span class='lparen'>(</span><span class='id identifier rubyid_data'>data</span> <span class='op'>+</span> <span class='id identifier rubyid_extra'>extra</span><span class='comma'>,</span> <span class='label'>algo:</span> <span class='id identifier rubyid_algo'>algo</span><span class='comma'>,</span> <span class='label'>key:</span> <span class='id identifier rubyid_key'>key</span><span class='rparen'>)</span>
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<span class='comment'># Append HMAC to provided data and Base64-encode the whole shebang
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</span> <span class='const'><span class='object_link'><a href="../../Rex.html" title="Rex (module)">Rex</a></span></span><span class='op'>::</span><span class='const'>Text</span><span class='period'>.</span><span class='id identifier rubyid_encode_base64'>encode_base64</span><span class='lparen'>(</span><span class='id identifier rubyid_data'>data</span> <span class='op'>+</span> <span class='id identifier rubyid_hmac'>hmac</span><span class='rparen'>)</span>
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<span class='kw'>end</span></pre>
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</td>
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</tr>
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</table>
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</div>
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<div class="method_details ">
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<h3 class="signature " id="generate_viewstate_hmac-class_method">
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.<strong>generate_viewstate_hmac</strong>(data, algo: 'sha1', key: '') ⇒ <tt>Object</tt>
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<pre class="lines">
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40</pre>
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<pre class="code"><span class="info file"># File 'lib/rex/exploit/view_state.rb', line 38</span>
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<span class='kw'>def</span> <span class='kw'>self</span><span class='period'>.</span><span class='id identifier rubyid_generate_viewstate_hmac'>generate_viewstate_hmac</span><span class='lparen'>(</span><span class='id identifier rubyid_data'>data</span><span class='comma'>,</span> <span class='label'>algo:</span> <span class='tstring'><span class='tstring_beg'>'</span><span class='tstring_content'>sha1</span><span class='tstring_end'>'</span></span><span class='comma'>,</span> <span class='label'>key:</span> <span class='tstring'><span class='tstring_beg'>'</span><span class='tstring_end'>'</span></span><span class='rparen'>)</span>
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<span class='const'>OpenSSL</span><span class='op'>::</span><span class='const'>HMAC</span><span class='period'>.</span><span class='id identifier rubyid_digest'>digest</span><span class='lparen'>(</span><span class='id identifier rubyid_algo'>algo</span><span class='comma'>,</span> <span class='id identifier rubyid_key'>key</span><span class='comma'>,</span> <span class='id identifier rubyid_data'>data</span><span class='rparen'>)</span>
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<span class='kw'>end</span></pre>
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</td>
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</tr>
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</table>
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</div>
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<div class="method_details ">
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<h3 class="signature " id="is_viewstate_valid?-class_method">
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.<strong>is_viewstate_valid?</strong>(encoded_viewstate, extra: '', algo: 'sha1', key: '') ⇒ <tt>Boolean</tt>
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<span class="aliases">Also known as:
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<span class="names"><span id='can_sign_viewstate?-class_method'>can_sign_viewstate?</span></span>
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</span>
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</h3><div class="docstring">
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<div class="discussion">
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</div>
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</div>
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<div class="tags">
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<p class="tag_title">Returns:</p>
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<ul class="return">
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<li>
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<span class='type'>(<tt>Boolean</tt>)</span>
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</li>
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<pre class="lines">
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61</pre>
|
||
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</td>
|
||
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<td>
|
||
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<pre class="code"><span class="info file"># File 'lib/rex/exploit/view_state.rb', line 42</span>
|
||
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|
||
|
|
<span class='kw'>def</span> <span class='kw'>self</span><span class='period'>.</span><span class='id identifier rubyid_is_viewstate_valid?'>is_viewstate_valid?</span><span class='lparen'>(</span><span class='id identifier rubyid_encoded_viewstate'>encoded_viewstate</span><span class='comma'>,</span> <span class='label'>extra:</span> <span class='tstring'><span class='tstring_beg'>'</span><span class='tstring_end'>'</span></span><span class='comma'>,</span> <span class='label'>algo:</span> <span class='tstring'><span class='tstring_beg'>'</span><span class='tstring_content'>sha1</span><span class='tstring_end'>'</span></span><span class='comma'>,</span> <span class='label'>key:</span> <span class='tstring'><span class='tstring_beg'>'</span><span class='tstring_end'>'</span></span><span class='rparen'>)</span>
|
||
|
|
<span class='id identifier rubyid_viewstate'>viewstate</span> <span class='op'>=</span> <span class='id identifier rubyid_decode_viewstate'>decode_viewstate</span><span class='lparen'>(</span><span class='id identifier rubyid_encoded_viewstate'>encoded_viewstate</span><span class='rparen'>)</span>
|
||
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|
|
||
|
|
<span class='kw'>unless</span> <span class='id identifier rubyid_viewstate'>viewstate</span><span class='lbracket'>[</span><span class='symbol'>:data</span><span class='rbracket'>]</span>
|
||
|
|
<span class='id identifier rubyid_raise'>raise</span> <span class='const'><span class='object_link'><a href="ViewState/Error.html" title="Rex::Exploit::ViewState::Error (class)">Error</a></span></span><span class='period'>.</span><span class='id identifier rubyid_new'>new</span><span class='lparen'>(</span><span class='tstring'><span class='tstring_beg'>'</span><span class='tstring_content'>Could not retrieve ViewState data</span><span class='tstring_end'>'</span></span><span class='rparen'>)</span>
|
||
|
|
<span class='kw'>end</span>
|
||
|
|
|
||
|
|
<span class='kw'>unless</span> <span class='lparen'>(</span><span class='id identifier rubyid_their_hmac'>their_hmac</span> <span class='op'>=</span> <span class='id identifier rubyid_viewstate'>viewstate</span><span class='lbracket'>[</span><span class='symbol'>:hmac</span><span class='rbracket'>]</span><span class='rparen'>)</span>
|
||
|
|
<span class='id identifier rubyid_raise'>raise</span> <span class='const'><span class='object_link'><a href="ViewState/Error.html" title="Rex::Exploit::ViewState::Error (class)">Error</a></span></span><span class='period'>.</span><span class='id identifier rubyid_new'>new</span><span class='lparen'>(</span><span class='tstring'><span class='tstring_beg'>'</span><span class='tstring_content'>Could not retrieve ViewState HMAC</span><span class='tstring_end'>'</span></span><span class='rparen'>)</span>
|
||
|
|
<span class='kw'>end</span>
|
||
|
|
|
||
|
|
<span class='id identifier rubyid_our_hmac'>our_hmac</span> <span class='op'>=</span> <span class='id identifier rubyid_generate_viewstate_hmac'>generate_viewstate_hmac</span><span class='lparen'>(</span>
|
||
|
|
<span class='id identifier rubyid_viewstate'>viewstate</span><span class='lbracket'>[</span><span class='symbol'>:data</span><span class='rbracket'>]</span> <span class='op'>+</span> <span class='id identifier rubyid_extra'>extra</span><span class='comma'>,</span>
|
||
|
|
<span class='label'>algo:</span> <span class='id identifier rubyid_algo'>algo</span><span class='comma'>,</span>
|
||
|
|
<span class='label'>key:</span> <span class='id identifier rubyid_key'>key</span>
|
||
|
|
<span class='rparen'>)</span>
|
||
|
|
|
||
|
|
<span class='comment'># Do we have what it takes?
|
||
|
|
</span> <span class='id identifier rubyid_our_hmac'>our_hmac</span> <span class='op'>==</span> <span class='id identifier rubyid_their_hmac'>their_hmac</span>
|
||
|
|
<span class='kw'>end</span></pre>
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
</div>
|
||
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</div>
|
||
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|
||
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</div>
|
||
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|
||
|
|
<div id="footer">
|
||
|
|
Generated on Fri May 8 17:04:13 2026 by
|
||
|
|
<a href="https://yardoc.org" title="Yay! A Ruby Documentation Tool" target="_parent">yard</a>
|
||
|
|
0.9.37 (ruby-3.1.5).
|
||
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</div>
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</div>
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</body>
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</html>
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