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<h1 id="derivepassphrase">derivepassphrase<a class="headerlink" href="#derivepassphrase" title="Permanent link">&para;</a></h1>
<p><a href="https://pypi.org/project/derivepassphrase"><img alt="PyPI - Version" src="https://img.shields.io/pypi/v/derivepassphrase.svg" /></a>
<a href="https://pypi.org/project/derivepassphrase"><img alt="PyPI - Python Version" src="https://img.shields.io/pypi/pyversions/derivepassphrase.svg" /></a></p>
<p>An almost faithful Python reimplementation of <a href="https://www.npmjs.com/package/vault">James Coglan&rsquo;s <code>vault</code></a>, a deterministic password manager/generator.</p>
<p>Using a master passphrase or a master SSH key, derive a passphrase for a given named service, subject to length, character and character repetition constraints.
The derivation is cryptographically strong, meaning that even if a single passphrase is compromised, guessing the master passphrase or a different service&rsquo;s passphrase is computationally infeasible.
The derivation is also deterministic, given the same inputs, thus the resulting passphrase need not be stored explicitly.
The service name and constraints themselves also need not be kept secret; the latter are usually stored in a world-readable file.</p>
<hr />
<h2 id="installation">Installation<a class="headerlink" href="#installation" title="Permanent link">&para;</a></h2>
<h3 id="with-pip">With <code>pip</code><a class="headerlink" href="#with-pip" title="Permanent link">&para;</a></h3>
<p>(If not inside a <a href="https://docs.python.org/3/library/venv.html">virtual environment</a>, use <code>pip install --user</code> instead of plain <code>pip install</code>.)</p>
<div class="highlight"><pre><span></span><code><span class="gp">$ </span>pip<span class="w"> </span>install<span class="w"> </span>derivepassphrase
</code></pre></div>
<p>To use the <code>export</code> subcommand, install the <code>export</code> extra:</p>
<div class="highlight"><pre><span></span><code><span class="gp">$ </span>pip<span class="w"> </span>install<span class="w"> </span><span class="s2">&quot;derivepassphrase[export]&quot;</span>
</code></pre></div>
<h3 id="manually">Manually<a class="headerlink" href="#manually" title="Permanent link">&para;</a></h3>
<p><code>derivepassphrase</code> is a pure Python package, and may be easily installed manually by placing the respective files and the package&rsquo;s dependencies into Python&rsquo;s import path.
<code>derivepassphrase</code> requires Python 3.9 or higher as well as the <a href="https://pypi.org/project/typing-extensions/">typing-extensions package</a> for its core functionality and programmatic interface, and <a href="https://pypi.org/project/click/"><code>click</code></a> 8.1 or higher for its command-line interface.
Using the <code>export vault</code> subcommand additionally requires the <a href="https://pypi.org/project/cryptography/">cryptography package</a>, version 38.0 or newer.</p>
<h2 id="quick-usage">Quick Usage<a class="headerlink" href="#quick-usage" title="Permanent link">&para;</a></h2>
<p><code>derivepassphrase</code> is designed to principally support multiple passphrase derivation schemes, but currently only the &ldquo;<a href="https://www.npmjs.com/package/vault">vault</a>&rdquo; scheme is implemented.</p>
<p>Using the passphrase <code>This passphrase is for demonstration purposes only.</code> when prompted:</p>
<div class="highlight"><pre><span></span><code><span class="gp">$ </span>derivepassphrase<span class="w"> </span>vault<span class="w"> </span>-p<span class="w"> </span>--length<span class="w"> </span><span class="m">30</span><span class="w"> </span>--upper<span class="w"> </span><span class="m">3</span><span class="w"> </span>--lower<span class="w"> </span><span class="m">1</span><span class="w"> </span>--number<span class="w"> </span><span class="m">2</span><span class="w"> </span>--space<span class="w"> </span><span class="m">0</span><span class="w"> </span>--symbol<span class="w"> </span><span class="m">0</span><span class="w"> </span>my-email-account
<span class="go">Passphrase: </span>
<span class="go">JKeet7GeBpxysOgdCEJo6UzmP8A0Ih</span>
</code></pre></div>
<p>Some time later…</p>
<div class="highlight"><pre><span></span><code><span class="gp">$ </span>derivepassphrase<span class="w"> </span>vault<span class="w"> </span>-p<span class="w"> </span>--length<span class="w"> </span><span class="m">30</span><span class="w"> </span>--upper<span class="w"> </span><span class="m">3</span><span class="w"> </span>--lower<span class="w"> </span><span class="m">1</span><span class="w"> </span>--number<span class="w"> </span><span class="m">2</span><span class="w"> </span>--space<span class="w"> </span><span class="m">0</span><span class="w"> </span>--symbol<span class="w"> </span><span class="m">0</span><span class="w"> </span>my-email-account
<span class="go">Passphrase: </span>
<span class="go">JKeet7GeBpxysOgdCEJo6UzmP8A0Ih</span>
</code></pre></div>
<h3 id="storing-settings">Storing settings<a class="headerlink" href="#storing-settings" title="Permanent link">&para;</a></h3>
<p><code>derivepassphrase</code> can store the length and character constraint settings in its configuration file so that you do not have to re-enter them each time.</p>
<div class="highlight"><pre><span></span><code><span class="gp">$ </span>derivepassphrase<span class="w"> </span>vault<span class="w"> </span>--config<span class="w"> </span>--length<span class="w"> </span><span class="m">30</span><span class="w"> </span>--upper<span class="w"> </span><span class="m">3</span><span class="w"> </span>--lower<span class="w"> </span><span class="m">1</span><span class="w"> </span>--number<span class="w"> </span><span class="m">2</span><span class="w"> </span>--space<span class="w"> </span><span class="m">0</span><span class="w"> </span>--symbol<span class="w"> </span><span class="m">0</span><span class="w"> </span>my-email-account
<span class="gp">$ </span>derivepassphrase<span class="w"> </span>vault<span class="w"> </span>-p<span class="w"> </span>my-email-account
<span class="go">Passphrase: </span>
<span class="go">JKeet7GeBpxysOgdCEJo6UzmP8A0Ih</span>
</code></pre></div>
<h3 id="ssh-agent-support">SSH agent support<a class="headerlink" href="#ssh-agent-support" title="Permanent link">&para;</a></h3>
<p>On UNIX-like systems with OpenSSH or PuTTY installed, you can use an Ed25519, Ed448 or RSA key from the agent instead of a master passphrase.
(<a href="https://github.com/the-13th-letter/derivepassphrase/issues/13" title="Issue 13: Support PuTTY/Pageant (and maybe OpenSSH/ssh-agent) on Windows">On Windows there are problems establishing communication channels with the agent.</a>)</p>
<div class="highlight"><pre><span></span><code><span class="gp">$ </span>derivepassphrase<span class="w"> </span>vault<span class="w"> </span>-k<span class="w"> </span>my-email-account
<span class="go">Suitable SSH keys:</span>
<span class="go">[1] ssh-rsa ...feXycsvJZ2uaYRjMdZeJGNAnHLUGLkBscw5aI8=  test key without passphrase</span>
<span class="go">[2] ssh-ed448 ...BQ72ZgtPMckdzabiz7JbM/b0JzcRzGLMsbwA=  test key without passphrase</span>
<span class="go">[3] ssh-ed25519 ...gJIXw//Mkhv5MEwidwcakUGCekJD/vCEml2  test key without passphrase</span>
<span class="go">Your selection? (1-3, leave empty to abort): 1</span>
<span class="go">oXDGCvMhLWPQyCzYtaobOq2Wh9olYj</span>
</code></pre></div>
<p><code>derivepassphrase</code> can store the SSH key selection in its configuration file so you do not have to re-select it each time.
This choice can be made either specifically for the service (in this case, <code>my-email-account</code>), or globally.</p>
<div class="highlight"><pre><span></span><code><span class="gp">$ </span>derivepassphrase<span class="w"> </span>vault<span class="w"> </span>--config<span class="w"> </span>-k<span class="w">  </span><span class="c1"># global setting</span>
<span class="go">Suitable SSH keys:</span>
<span class="go">[1] ssh-rsa ...feXycsvJZ2uaYRjMdZeJGNAnHLUGLkBscw5aI8=  test key without passphrase</span>
<span class="go">[2] ssh-ed448 ...BQ72ZgtPMckdzabiz7JbM/b0JzcRzGLMsbwA=  test key without passphrase</span>
<span class="go">[3] ssh-ed25519 ...gJIXw//Mkhv5MEwidwcakUGCekJD/vCEml2  test key without passphrase</span>
<span class="go">Your selection? (1-3, leave empty to abort): 1</span>
<span class="gp">$ </span>derivepassphrase<span class="w"> </span>vault<span class="w"> </span>my-email-account
<span class="go">oXDGCvMhLWPQyCzYtaobOq2Wh9olYj</span>
</code></pre></div>
<h2 id="license">License<a class="headerlink" href="#license" title="Permanent link">&para;</a></h2>
<p><code>derivepassphrase</code> is distributed under the terms of the <a href="https://spdx.org/licenses/MIT.html">MIT</a> license.</p>

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