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<meta name="description" content="Ready-to-use and customizable users management for FastAPI">
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FastAPI Users
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Password hash
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<ol class="md-search-result__list" role="presentation"></ol>
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frankie567/fastapi-users
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<div class="md-container" data-md-component="container">
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<a href="https://github.com/fastapi-users/fastapi-users" title="Go to repository" class="md-source" data-md-component="source">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512"><!--! Font Awesome Free 6.2.1 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2022 Fonticons, Inc.--><path d="M439.55 236.05 244 40.45a28.87 28.87 0 0 0-40.81 0l-40.66 40.63 51.52 51.52c27.06-9.14 52.68 16.77 43.39 43.68l49.66 49.66c34.23-11.8 61.18 31 35.47 56.69-26.49 26.49-70.21-2.87-56-37.34L240.22 199v121.85c25.3 12.54 22.26 41.85 9.08 55a34.34 34.34 0 0 1-48.55 0c-17.57-17.6-11.07-46.91 11.25-56v-123c-20.8-8.51-24.6-30.74-18.64-45L142.57 101 8.45 235.14a28.86 28.86 0 0 0 0 40.81l195.61 195.6a28.86 28.86 0 0 0 40.8 0l194.69-194.69a28.86 28.86 0 0 0 0-40.81z"/></svg>
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frankie567/fastapi-users
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<li class="md-nav__item">
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About
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<a href="../../installation/" class="md-nav__link">
Installation
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Configuration
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Configuration
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Overview
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User model and databases
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User model and databases
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SQLAlchemy
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Beanie
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Authentication backends
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<nav class="md-nav" aria-label="Authentication backends" data-md-level="2">
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Authentication backends
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<li class="md-nav__item">
<a href="../authentication/" class="md-nav__link">
Introduction
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Transports
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Transports
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<li class="md-nav__item">
<a href="../authentication/transports/cookie/" class="md-nav__link">
Cookie
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<a href="../authentication/transports/bearer/" class="md-nav__link">
Bearer
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<input class="md-nav__toggle md-toggle " data-md-toggle="__nav_3_3_3" type="checkbox" id="__nav_3_3_3" >
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Strategies
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Strategies
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<li class="md-nav__item">
<a href="../authentication/strategies/database/" class="md-nav__link">
Database
</a>
</li>
<li class="md-nav__item">
<a href="../authentication/strategies/jwt/" class="md-nav__link">
JWT
</a>
</li>
<li class="md-nav__item">
<a href="../authentication/strategies/redis/" class="md-nav__link">
Redis
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</li>
</ul>
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<li class="md-nav__item">
<a href="../authentication/backend/" class="md-nav__link">
Create a backend
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</li>
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<a href="../user-manager/" class="md-nav__link">
UserManager
</a>
</li>
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<a href="../schemas/" class="md-nav__link">
Schemas
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</li>
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<input class="md-nav__toggle md-toggle " data-md-toggle="__nav_3_6" type="checkbox" id="__nav_3_6" >
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Routers
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<nav class="md-nav" aria-label="Routers" data-md-level="2">
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Routers
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<ul class="md-nav__list" data-md-scrollfix>
<li class="md-nav__item">
<a href="../routers/" class="md-nav__link">
Introduction
</a>
</li>
<li class="md-nav__item">
<a href="../routers/auth/" class="md-nav__link">
Auth router
</a>
</li>
<li class="md-nav__item">
<a href="../routers/register/" class="md-nav__link">
Register routes
</a>
</li>
<li class="md-nav__item">
<a href="../routers/verify/" class="md-nav__link">
Verify router
</a>
</li>
<li class="md-nav__item">
<a href="../routers/reset/" class="md-nav__link">
Reset password router
</a>
</li>
<li class="md-nav__item">
<a href="../routers/users/" class="md-nav__link">
Users router
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</li>
</ul>
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<li class="md-nav__item">
<a href="../full-example/" class="md-nav__link">
Full example
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</li>
<li class="md-nav__item">
<a href="../oauth/" class="md-nav__link">
OAuth2
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</li>
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<input class="md-nav__toggle md-toggle" data-md-toggle="toc" type="checkbox" id="__toc">
<label class="md-nav__link md-nav__link--active" for="__toc">
Password hash
<span class="md-nav__icon md-icon"></span>
</label>
<a href="./" class="md-nav__link md-nav__link--active">
Password hash
</a>
<nav class="md-nav md-nav--secondary" aria-label="Table of contents">
<label class="md-nav__title" for="__toc">
<span class="md-nav__icon md-icon"></span>
Table of contents
</label>
<ul class="md-nav__list" data-md-component="toc" data-md-scrollfix>
<li class="md-nav__item">
<a href="#customize-cryptcontext" class="md-nav__link">
Customize CryptContext
</a>
</li>
<li class="md-nav__item">
<a href="#full-customization" class="md-nav__link">
Full customization
</a>
</li>
</ul>
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Usage
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<nav class="md-nav" aria-label="Usage" data-md-level="1">
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Usage
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<ul class="md-nav__list" data-md-scrollfix>
<li class="md-nav__item">
<a href="../../usage/flow/" class="md-nav__link">
Flow
</a>
</li>
<li class="md-nav__item">
<a href="../../usage/routes/" class="md-nav__link">
Routes
</a>
</li>
<li class="md-nav__item">
<a href="../../usage/current-user/" class="md-nav__link">
Get current user
</a>
</li>
</ul>
</nav>
</li>
<li class="md-nav__item md-nav__item--section md-nav__item--nested">
<input class="md-nav__toggle md-toggle " data-md-toggle="__nav_5" type="checkbox" id="__nav_5" >
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Cookbook
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<h1 id="password-hash">Password hash<a class="headerlink" href="#password-hash" title="Permanent link">&para;</a></h1>
<p>By default, FastAPI Users will use the <a href="https://en.wikipedia.org/wiki/Bcrypt">BCrypt algorithm</a> to <strong>hash and salt</strong> passwords before storing them in the database.</p>
<p>The implementation is provided by <a href="https://passlib.readthedocs.io/en/stable/index.html">Passlib</a>, a battle-tested Python library for password hashing.</p>
<h2 id="customize-cryptcontext">Customize <code>CryptContext</code><a class="headerlink" href="#customize-cryptcontext" title="Permanent link">&para;</a></h2>
<p>If you need to support other hashing algorithms, you can customize the <a href="https://passlib.readthedocs.io/en/stable/lib/passlib.context.html#the-cryptcontext-class"><code>CryptContext</code> object of Passlib</a>.</p>
<p>For this, you'll need to instantiate the <code>PasswordHelper</code> class and pass it your <code>CryptContext</code>. The example below shows you how you can create a <code>CryptContext</code> to add support for the Argon2 algorithm while deprecating BCrypt.</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a><span class="kn">from</span> <span class="nn">fastapi_users.password</span> <span class="kn">import</span> <span class="n">PasswordHelper</span>
<a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a><span class="kn">from</span> <span class="nn">passlib.context</span> <span class="kn">import</span> <span class="n">CryptContext</span>
<a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a>
<a id="__codelineno-0-4" name="__codelineno-0-4" href="#__codelineno-0-4"></a><span class="n">context</span> <span class="o">=</span> <span class="n">CryptContext</span><span class="p">(</span><span class="n">schemes</span><span class="o">=</span><span class="p">[</span><span class="s2">&quot;argon2&quot;</span><span class="p">,</span> <span class="s2">&quot;bcrypt&quot;</span><span class="p">],</span> <span class="n">deprecated</span><span class="o">=</span><span class="s2">&quot;auto&quot;</span><span class="p">)</span>
<a id="__codelineno-0-5" name="__codelineno-0-5" href="#__codelineno-0-5"></a><span class="n">password_helper</span> <span class="o">=</span> <span class="n">PasswordHelper</span><span class="p">(</span><span class="n">context</span><span class="p">)</span>
</code></pre></div>
<p>Finally, pass the <code>password_helper</code> variable while instantiating your <code>UserManager</code>:</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a><span class="k">async</span> <span class="k">def</span> <span class="nf">get_user_manager</span><span class="p">(</span><span class="n">user_db</span><span class="o">=</span><span class="n">Depends</span><span class="p">(</span><span class="n">get_user_db</span><span class="p">)):</span>
<a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a> <span class="k">yield</span> <span class="n">UserManager</span><span class="p">(</span><span class="n">user_db</span><span class="p">,</span> <span class="n">password_helper</span><span class="p">)</span>
</code></pre></div>
<div class="admonition info">
<p class="admonition-title">Password hashes are automatically upgraded</p>
<p>FastAPI Users takes care of upgrading the password hash to a more recent algorithm when needed.</p>
<p>Typically, when a user logs in, we'll check if the password hash algorithm is deprecated.</p>
<p>If it is, we take the opportunity of having the password in plain-text at hand (since the user just logged in!) to hash it with a better algorithm and update it in database.</p>
</div>
<div class="admonition warning">
<p class="admonition-title">Dependencies for alternative algorithms are not included by default</p>
<p>FastAPI Users won't install required dependencies to make other algorithms like Argon2 work. It's up to you to install them.</p>
</div>
<h2 id="full-customization">Full customization<a class="headerlink" href="#full-customization" title="Permanent link">&para;</a></h2>
<p>If you don't wist to use Passlib at all <strong>which we don't recommend unless you're absolutely sure of what you're doing</strong> — you can implement your own <code>PasswordHelper</code> class as long as it implements the <code>PasswordHelperProtocol</code> and its methods.</p>
<div class="highlight"><pre><span></span><code><a id="__codelineno-2-1" name="__codelineno-2-1" href="#__codelineno-2-1"></a><span class="kn">from</span> <span class="nn">typing</span> <span class="kn">import</span> <span class="n">Tuple</span>
<a id="__codelineno-2-2" name="__codelineno-2-2" href="#__codelineno-2-2"></a>
<a id="__codelineno-2-3" name="__codelineno-2-3" href="#__codelineno-2-3"></a><span class="kn">from</span> <span class="nn">fastapi_users.password</span> <span class="kn">import</span> <span class="n">PasswordHelperProtocol</span>
<a id="__codelineno-2-4" name="__codelineno-2-4" href="#__codelineno-2-4"></a>
<a id="__codelineno-2-5" name="__codelineno-2-5" href="#__codelineno-2-5"></a><span class="k">class</span> <span class="nc">PasswordHelper</span><span class="p">(</span><span class="n">PasswordHelperProtocol</span><span class="p">):</span>
<a id="__codelineno-2-6" name="__codelineno-2-6" href="#__codelineno-2-6"></a> <span class="k">def</span> <span class="nf">verify_and_update</span><span class="p">(</span>
<a id="__codelineno-2-7" name="__codelineno-2-7" href="#__codelineno-2-7"></a> <span class="bp">self</span><span class="p">,</span> <span class="n">plain_password</span><span class="p">:</span> <span class="nb">str</span><span class="p">,</span> <span class="n">hashed_password</span><span class="p">:</span> <span class="nb">str</span>
<a id="__codelineno-2-8" name="__codelineno-2-8" href="#__codelineno-2-8"></a> <span class="p">)</span> <span class="o">-&gt;</span> <span class="n">Tuple</span><span class="p">[</span><span class="nb">bool</span><span class="p">,</span> <span class="nb">str</span><span class="p">]:</span>
<a id="__codelineno-2-9" name="__codelineno-2-9" href="#__codelineno-2-9"></a> <span class="o">...</span>
<a id="__codelineno-2-10" name="__codelineno-2-10" href="#__codelineno-2-10"></a>
<a id="__codelineno-2-11" name="__codelineno-2-11" href="#__codelineno-2-11"></a> <span class="k">def</span> <span class="nf">hash</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">password</span><span class="p">:</span> <span class="nb">str</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="nb">str</span><span class="p">:</span>
<a id="__codelineno-2-12" name="__codelineno-2-12" href="#__codelineno-2-12"></a> <span class="o">...</span>
<a id="__codelineno-2-13" name="__codelineno-2-13" href="#__codelineno-2-13"></a>
<a id="__codelineno-2-14" name="__codelineno-2-14" href="#__codelineno-2-14"></a> <span class="k">def</span> <span class="nf">generate</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="nb">str</span><span class="p">:</span>
<a id="__codelineno-2-15" name="__codelineno-2-15" href="#__codelineno-2-15"></a> <span class="o">...</span>
</code></pre></div>
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