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<h1>fast-srp-hap</h1>
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<a href="#fast-srp-hap" id="fast-srp-hap" style="color: inherit; text-decoration: none;">
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<h1>fast-srp-hap</h1>
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</a>
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<p><img src="https://badgen.net/npm/v/fast-srp-hap" alt="NPM-Version">
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<img src="https://badgen.net/npm/dt/fast-srp-hap" alt="NPM-Downloads">
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<img src="https://github.com/homebridge/fast-srp/workflows/Node-CI/badge.svg" alt="Node-CI">
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<a href="https://coveralls.io/github/homebridge/fast-srp?branch=master"><img src="https://coveralls.io/repos/github/homebridge/fast-srp/badge.svg?branch=master" alt="Coverage Status"></a></p>
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<p>Is a pure <a href="https://nodejs.org/">NodeJS</a> implementation of the <a href="http://srp.stanford.edu/">SRP6a protocol</a>.</p>
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<p>It's a derived work of <a href="http://jedparsons.com/">Jed Parson</a>'s <a href="https://github.com/jedp/node-srp">node-srp</a> and <a href="http://www-cs-students.stanford.edu/~tjw/">Tom Wu</a>'s <a href="http://www-cs-students.stanford.edu/~tjw/jsbn/">jsbn</a>.</p>
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<p>Full documentation can be found <a href="https://developers.homebridge.io/fast-srp/modules.html">here</a>.</p>
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<a href="#creating-the-verifier" id="creating-the-verifier" style="color: inherit; text-decoration: none;">
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<h2>Creating the Verifier</h2>
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</a>
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<pre><code class="language-ts"><span style="color: #AF00DB">import</span><span style="color: #000000"> { </span><span style="color: #001080">SRP</span><span style="color: #000000"> } </span><span style="color: #AF00DB">from</span><span style="color: #000000"> </span><span style="color: #A31515">'fast-srp-hap'</span><span style="color: #000000">;</span>
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<span style="color: #008000">/**</span>
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<span style="color: #008000"> * Computes the verifier of a user. Only needed to add the user to the auth system.</span>
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<span style="color: #008000"> *</span>
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<span style="color: #008000"> * </span><span style="color: #0000FF">@param</span><span style="color: #008000"> </span><span style="color: #267F99">{string}</span><span style="color: #008000"> </span><span style="color: #001080">I</span><span style="color: #008000"> Username to compute verifier</span>
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<span style="color: #008000"> * </span><span style="color: #0000FF">@param</span><span style="color: #008000"> </span><span style="color: #267F99">{string}</span><span style="color: #008000"> </span><span style="color: #001080">P</span><span style="color: #008000"> Password</span>
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<span style="color: #008000"> * </span><span style="color: #0000FF">@return</span><span style="color: #008000"> </span><span style="color: #267F99">{Promise<{salt: Buffer, verifier: Buffer}>}</span>
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<span style="color: #008000"> */</span>
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<span style="color: #0000FF">async</span><span style="color: #000000"> </span><span style="color: #0000FF">function</span><span style="color: #000000"> </span><span style="color: #795E26">srp6a_create_user</span><span style="color: #000000">(</span><span style="color: #001080">I</span><span style="color: #000000">: </span><span style="color: #267F99">string</span><span style="color: #000000">, </span><span style="color: #001080">P</span><span style="color: #000000">: </span><span style="color: #267F99">string</span><span style="color: #000000">) {</span>
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<span style="color: #000000"> </span><span style="color: #0000FF">const</span><span style="color: #000000"> </span><span style="color: #0070C1">salt</span><span style="color: #000000"> = </span><span style="color: #AF00DB">await</span><span style="color: #000000"> </span><span style="color: #0070C1">SRP</span><span style="color: #000000">.</span><span style="color: #795E26">genKey</span><span style="color: #000000">(</span><span style="color: #098658">32</span><span style="color: #000000">);</span>
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<span style="color: #000000"> </span>
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<span style="color: #000000"> </span><span style="color: #AF00DB">return</span><span style="color: #000000"> {</span>
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<span style="color: #000000"> </span><span style="color: #008000">// The salt is required for authenticating the user later</span>
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<span style="color: #000000"> </span><span style="color: #001080">salt</span><span style="color: #000000">,</span>
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<span style="color: #000000"> </span><span style="color: #001080">verifier:</span><span style="color: #000000"> </span><span style="color: #0070C1">SRP</span><span style="color: #000000">.</span><span style="color: #795E26">computeVerifier</span><span style="color: #000000">(</span><span style="color: #0070C1">SRP</span><span style="color: #000000">.</span><span style="color: #001080">params</span><span style="color: #000000">[</span><span style="color: #098658">4096</span><span style="color: #000000">], </span><span style="color: #001080">salt</span><span style="color: #000000">, </span><span style="color: #001080">Buffer</span><span style="color: #000000">.</span><span style="color: #795E26">from</span><span style="color: #000000">(</span><span style="color: #0070C1">I</span><span style="color: #000000">), </span><span style="color: #001080">Buffer</span><span style="color: #000000">.</span><span style="color: #795E26">from</span><span style="color: #000000">(</span><span style="color: #0070C1">P</span><span style="color: #000000">)),</span>
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<span style="color: #000000"> };</span>
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<span style="color: #000000">}</span>
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<span style="color: #AF00DB">await</span><span style="color: #000000"> </span><span style="color: #795E26">srp6a_create_user</span><span style="color: #000000">(</span><span style="color: #A31515">'Zarmack Tanen'</span><span style="color: #000000">, </span><span style="color: #A31515">'*****'</span><span style="color: #000000">).</span><span style="color: #795E26">then</span><span style="color: #000000">(({</span><span style="color: #001080">salt</span><span style="color: #000000">, </span><span style="color: #001080">verifier</span><span style="color: #000000">}) </span><span style="color: #0000FF">=></span><span style="color: #000000"> {</span>
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<span style="color: #000000"> </span><span style="color: #001080">console</span><span style="color: #000000">.</span><span style="color: #795E26">log</span><span style="color: #000000">(</span><span style="color: #A31515">'SRP6a verifier and salt of Zarmack Tanen user is %s and %s'</span><span style="color: #000000">,</span>
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<span style="color: #000000"> </span><span style="color: #001080">verifier</span><span style="color: #000000">.</span><span style="color: #795E26">toString</span><span style="color: #000000">(</span><span style="color: #A31515">'hex'</span><span style="color: #000000">), </span><span style="color: #001080">salt</span><span style="color: #000000">.</span><span style="color: #795E26">toString</span><span style="color: #000000">(</span><span style="color: #A31515">'hex'</span><span style="color: #000000">));</span>
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<span style="color: #000000">});</span>
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</code></pre>
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<a href="#server" id="server" style="color: inherit; text-decoration: none;">
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<h2>Server</h2>
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</a>
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<pre><code class="language-ts"><span style="color: #AF00DB">import</span><span style="color: #000000"> {</span><span style="color: #001080">SRP</span><span style="color: #000000">, </span><span style="color: #001080">SrpServer</span><span style="color: #000000">} </span><span style="color: #AF00DB">from</span><span style="color: #000000"> </span><span style="color: #A31515">'fast-srp-hap'</span><span style="color: #000000">;</span>
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<span style="color: #000000">(</span><span style="color: #0000FF">async</span><span style="color: #000000"> () </span><span style="color: #0000FF">=></span><span style="color: #000000"> {</span>
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<span style="color: #000000"> </span><span style="color: #008000">// Get the user details from somewhere</span>
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<span style="color: #000000"> </span><span style="color: #0000FF">const</span><span style="color: #000000"> </span><span style="color: #0070C1">user</span><span style="color: #000000"> = {</span>
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<span style="color: #000000"> </span><span style="color: #001080">username:</span><span style="color: #000000"> </span><span style="color: #A31515">'username'</span><span style="color: #000000">, </span><span style="color: #008000">// Or a Buffer</span>
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<span style="color: #000000"> </span><span style="color: #008000">// If we have the plaintext password</span>
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<span style="color: #000000"> </span><span style="color: #001080">salt:</span><span style="color: #000000"> </span><span style="color: #AF00DB">await</span><span style="color: #000000"> </span><span style="color: #0070C1">SRP</span><span style="color: #000000">.</span><span style="color: #795E26">genKey</span><span style="color: #000000">(</span><span style="color: #098658">32</span><span style="color: #000000">),</span>
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<span style="color: #000000"> </span><span style="color: #001080">password:</span><span style="color: #000000"> </span><span style="color: #A31515">'password'</span><span style="color: #000000">, </span><span style="color: #008000">// Or a Buffer</span>
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<span style="color: #000000"> </span>
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<span style="color: #000000"> </span><span style="color: #008000">// If we have a saved verifier</span>
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<span style="color: #000000"> </span><span style="color: #001080">salt:</span><span style="color: #000000"> </span><span style="color: #001080">Buffer</span><span style="color: #000000">.</span><span style="color: #795E26">from</span><span style="color: #000000">(</span><span style="color: #A31515">'...'</span><span style="color: #000000">),</span>
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<span style="color: #000000"> </span><span style="color: #001080">verifier:</span><span style="color: #000000"> </span><span style="color: #001080">Buffer</span><span style="color: #000000">.</span><span style="color: #795E26">from</span><span style="color: #000000">(</span><span style="color: #A31515">'...'</span><span style="color: #000000">),</span>
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<span style="color: #000000"> };</span>
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<span style="color: #000000"> </span><span style="color: #008000">// Generate a secret key</span>
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<span style="color: #000000"> </span><span style="color: #0000FF">const</span><span style="color: #000000"> </span><span style="color: #0070C1">secret</span><span style="color: #000000"> = </span><span style="color: #AF00DB">await</span><span style="color: #000000"> </span><span style="color: #0070C1">SRP</span><span style="color: #000000">.</span><span style="color: #795E26">genKey</span><span style="color: #000000">(</span><span style="color: #098658">32</span><span style="color: #000000">);</span>
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<span style="color: #000000"> </span><span style="color: #0000FF">const</span><span style="color: #000000"> </span><span style="color: #0070C1">server</span><span style="color: #000000"> = </span><span style="color: #0000FF">new</span><span style="color: #000000"> </span><span style="color: #795E26">SrpServer</span><span style="color: #000000">(</span><span style="color: #0070C1">SRP</span><span style="color: #000000">.</span><span style="color: #001080">params</span><span style="color: #000000">[</span><span style="color: #098658">3076</span><span style="color: #000000">], </span><span style="color: #001080">user</span><span style="color: #000000">, </span><span style="color: #001080">secret</span><span style="color: #000000">); </span><span style="color: #008000">// For Apple SRP use params.hap</span>
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<span style="color: #000000"> </span><span style="color: #008000">// ...</span>
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<span style="color: #000000">})();</span>
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</code></pre>
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