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<li><a href="#install">Install</a>
<ul>
<li><a href="#cratesio">crates.io</a></li>
<li><a href="#pre-compiled-binaries">Pre-compiled binaries</a></li>
<li><a href="#build-from-source">Build from source</a></li>
</ul>
</li>
<li><a href="#pass-mcaptcha-challenge">Pass mCaptcha challenge</a>
<ul>
<li><a href="#from-protected-page-url">From protected page URL</a></li>
<li><a href="#widget-url">Widget URL</a></li>
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<h1>CLI tool</h1>
<p class="lead"></p>
<p>A CLI tool exists to compute mCaptcha challenges. It can be installed
from multiple sources:</p>
<h2 id="install">Install<a href="#install" class="anchor" aria-hidden="true">#</a> </h2>
<h3 id="cratesio">crates.io<a href="#cratesio" class="anchor" aria-hidden="true">#</a> </h3>
<p>The CLI tool is available on, <a href="https://crates.io">crates.io</a>, the Rust
language&rsquo;s package registry. Rust language toolchain is required to
install from crates.io, please see <a href="https://rustup.rs">rustup.rs</a> for
Instructions to install it.</p>
<div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#282a36;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-bash" data-lang="bash"><span style="display:flex;"><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">1</span><span>cargo install mcaptcha-cli
</span></span></code></pre></div><h3 id="pre-compiled-binaries">Pre-compiled binaries<a href="#pre-compiled-binaries" class="anchor" aria-hidden="true">#</a> </h3>
<p>Nightly builds and stable releases are regularly published to
<a href="https://dl.mcaptcha.org/mcaptcha/cli">dl.mcaptcha.org</a> for a variety of
CPU architectures and operating systems.</p>
<ol>
<li>Download binary, checksum and GPG signature files</li>
</ol>
<div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#282a36;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-bash" data-lang="bash"><span style="display:flex;"><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">1</span><span>wget https://dl.mcaptcha.org/mcaptcha/cli/<span style="color:#ff79c6">{</span>VERSION<span style="color:#ff79c6">}</span>/<span style="color:#ff79c6">{</span>FILENAME<span style="color:#ff79c6">}</span>.tar.gz
</span></span><span style="display:flex;"><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">2</span><span>wget https://dl.mcaptcha.org/mcaptcha/cli/<span style="color:#ff79c6">{</span>VERSION<span style="color:#ff79c6">}</span>/<span style="color:#ff79c6">{</span>FILENAME<span style="color:#ff79c6">}</span>.tar.gz.asc
</span></span><span style="display:flex;"><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">3</span><span>wget https://dl.mcaptcha.org/mcaptcha/cli/<span style="color:#ff79c6">{</span>VERSION<span style="color:#ff79c6">}</span>/<span style="color:#ff79c6">{</span>FILENAME<span style="color:#ff79c6">}</span>.tar.gz.sha256
</span></span></code></pre></div><ol start="2">
<li>Verify checksum</li>
</ol>
<div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#282a36;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-bash" data-lang="bash"><span style="display:flex;"><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">1</span><span>sha256sum -c <span style="color:#ff79c6">{</span>FILENAME<span style="color:#ff79c6">}</span>.tar.gz.sha256
</span></span></code></pre></div><ol start="3">
<li>Download mCaptcha&rsquo;s GPG release keys and verify GPG signature</li>
</ol>
<div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#282a36;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-bash" data-lang="bash"><span style="display:flex;"><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">1</span><span>gpg --keyserver keyserver.ubuntu.com --recv 73DAC973A9ADBB9ADCB5CDC4595A08135BA9FF73
</span></span><span style="display:flex;"><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">2</span><span>gpg --verify <span style="color:#ff79c6">{</span>FILENAME<span style="color:#ff79c6">}</span>.tar.gz.asc
</span></span></code></pre></div><ol start="4">
<li>Install Binary</li>
</ol>
<div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#282a36;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-bash" data-lang="bash"><span style="display:flex;"><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">1</span><span>tar -xvzf <span style="color:#ff79c6">{</span>FILENAME<span style="color:#ff79c6">}</span>.tar.gz <span style="color:#ff79c6">&amp;&amp;</span> sudo cp <span style="color:#ff79c6">{</span>FILENAME<span style="color:#ff79c6">}</span>/mcaptcha-cli /usr/local/bin
</span></span></code></pre></div><h3 id="build-from-source">Build from source<a href="#build-from-source" class="anchor" aria-hidden="true">#</a> </h3>
<ol>
<li>Install Rust tool chain
Please see <a href="https://rustup.rs">here</a> for instructions.</li>
<li>Download source code</li>
</ol>
<div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#282a36;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-bash" data-lang="bash"><span style="display:flex;"><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">1</span><span>git clone https://git.batsense.net/mCaptcha/cli
</span></span></code></pre></div><ol start="3">
<li>Compile and install</li>
</ol>
<div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#282a36;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-bash" data-lang="bash"><span style="display:flex;"><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">1</span><span>cargo build --release <span style="color:#ff79c6">&amp;&amp;</span> sudp cp ./target/release/mcaptcha-cli
</span></span><span style="display:flex;"><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">2</span><span>/usr/local/bin
</span></span></code></pre></div><h2 id="pass-mcaptcha-challenge">Pass mCaptcha challenge<a href="#pass-mcaptcha-challenge" class="anchor" aria-hidden="true">#</a> </h2>
<p>The CLI tool requires details about the challenge to work on it. The
tool can be used in three different modes compute challenge:</p>
<ol>
<li>Protected Page: Compute mCaptcha challenge for the CAPTCHA at a
protected page</li>
<li>Widget URL: Compute PoW for captcha at widget URL</li>
<li>(Developer mode) Offline: Computes PoW over given CAPTCHA parameters</li>
</ol>
<h3 id="from-protected-page-url">From protected page URL<a href="#from-protected-page-url" class="anchor" aria-hidden="true">#</a> </h3>
<p>The most convenient mode: copy the URL of the webpage which has the
mCaptcha widget (example: showcase.mcaptcha.org) and run the CLI tool
with it to get an authorization code:
Compute challenge using the URL</p>
<div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#282a36;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-bash" data-lang="bash"><span style="display:flex;"><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">1</span><span>03:39 atm@lab cli ±|feat-parse-webpage ✗|→ mcaptcha-cli protected-page https://showcase.mcaptcha.org/
</span></span><span style="display:flex;"><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">2</span><span>Authorization token: eRAZJiMrW58uDYA1s64Tmwq1u30HutuF
</span></span></code></pre></div><h3 id="widget-url">Widget URL<a href="#widget-url" class="anchor" aria-hidden="true">#</a> </h3>
<p>If you have the widget URL (will be in format https://mcaptcha.example.org/widget?sitekey=randomstring), it can be used to solve challenge as well:</p>
<div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#282a36;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-bash" data-lang="bash"><span style="display:flex;"><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">1</span><span>Compute PoW by fetching parameters from CAPTCHA URL
</span></span><span style="display:flex;"><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">2</span><span>
</span></span><span style="display:flex;"><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">3</span><span>Usage: mcaptcha-cli online --url &lt;URL&gt;
</span></span><span style="display:flex;"><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">4</span><span>
</span></span><span style="display:flex;"><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">5</span><span>Options:
</span></span><span style="display:flex;"><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">6</span><span> -u, --url &lt;URL&gt; URL of the CAPTCHA. Example: https://example.org/widget?sitekey<span style="color:#ff79c6">=</span>foo
</span></span><span style="display:flex;"><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">7</span><span> -h, --help Print <span style="color:#8be9fd;font-style:italic">help</span>
</span></span></code></pre></div><p>Example usage:</p>
<div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#282a36;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-bash" data-lang="bash"><span style="display:flex;"><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">1</span><span>13:32 atm@lab cli ±|online ✗|→ mcaptcha-cli online -u https://demo.mcaptcha.org/widget?sitekey<span style="color:#ff79c6">=</span>pHy0AktWyOKuxZDzFfoaewncWecCHo23
</span></span><span style="display:flex;"><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">2</span><span>Authorization token: 3xleN26OctBuVu3X4t6CYyUjErhaxQvz
</span></span></code></pre></div><h3 id="developer-mode-offline">[Developer mode] Offline<a href="#developer-mode-offline" class="anchor" aria-hidden="true">#</a> </h3>
<p>Useful while debugging mCaptcha configurations, works on raw challenge
parameters.</p>
<p>Help menu:</p>
<div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#282a36;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-bash" data-lang="bash"><span style="display:flex;"><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">1</span><span>Compute PoW with offline parameters
</span></span><span style="display:flex;"><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">2</span><span>
</span></span><span style="display:flex;"><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">3</span><span>Usage: mcaptcha-cli offline --salt &lt;SALT&gt; --phrase &lt;PHRASE&gt; --difficulty-factor &lt;DIFFICULTY_FACTOR&gt;
</span></span><span style="display:flex;"><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">4</span><span>
</span></span><span style="display:flex;"><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">5</span><span>Options:
</span></span><span style="display:flex;"><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">6</span><span> -s, --salt &lt;SALT&gt; Salt with which PoW should be computed
</span></span><span style="display:flex;"><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">7</span><span> -p, --phrase &lt;PHRASE&gt; Phrase over which PoW should be computed
</span></span><span style="display:flex;"><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">8</span><span> -d, --difficulty-factor &lt;DIFFICULTY_FACTOR&gt; Difficulty Factor
</span></span><span style="display:flex;"><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">9</span><span> -h, --help Print <span style="color:#8be9fd;font-style:italic">help</span>
</span></span></code></pre></div><p>Example usage:</p>
<div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#282a36;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-bash" data-lang="bash"><span style="display:flex;"><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">1</span><span>13:28 atm@lab cli ±|online|→ mcaptcha-cli offline -s <span style="color:#ff79c6">$(</span>rand 32<span style="color:#ff79c6">)</span> -p <span style="color:#ff79c6">$(</span>rand 32<span style="color:#ff79c6">)</span> -d <span style="color:#bd93f9">50000</span>
</span></span><span style="display:flex;"><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">2</span><span>difficulty: <span style="color:#bd93f9">50000</span>
</span></span><span style="display:flex;"><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">3</span><span>nonce: <span style="color:#bd93f9">90507</span>
</span></span><span style="display:flex;"><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">4</span><span>original phrase: f351f333d44b2c6b5bf7f033b065bbb8fb5e9dd153bd402e43ed04425f5a3859
</span></span><span style="display:flex;"><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">5</span><span>result: <span style="color:#bd93f9">340276562956196291522979356090220150471</span>
</span></span></code></pre></div><p>Where rand is <a href="https://github.com/realaravinth/dotfiles/blob/6fc6c87cc912e17488a35c0d3327ecf393221270/scripts/rand#L20">this</a> script.</p>
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