__  __    __   __  _____      _            _          _____ _          _ _ 
 |  \/  |   \ \ / / |  __ \    (_)          | |        / ____| |        | | |
 | \  / |_ __\ V /  | |__) | __ ___   ____ _| |_ ___  | (___ | |__   ___| | |
 | |\/| | '__|> <   |  ___/ '__| \ \ / / _` | __/ _ \  \___ \| '_ \ / _ \ | |
 | |  | | |_ / . \  | |   | |  | |\ V / (_| | ||  __/  ____) | | | |  __/ | |
 |_|  |_|_(_)_/ \_\ |_|   |_|  |_| \_/ \__,_|\__\___| |_____/|_| |_|\___V 2.1
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<h1 class="logo"><a href="../index.html">The Linux Kernel</a></h1>



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<section id="crypto-api">
<h1>Crypto API<a class="headerlink" href="#crypto-api" title="Link to this heading">ΒΆ</a></h1>
<dl class="field-list simple">
<dt class="field-odd">Author<span class="colon">:</span></dt>
<dd class="field-odd"><p>Stephan Mueller</p>
</dd>
<dt class="field-even">Author<span class="colon">:</span></dt>
<dd class="field-even"><p>Marek Vasut</p>
</dd>
</dl>
<p>This documentation outlines the Linux kernel crypto API with its
concepts, details about developing cipher implementations, employment of the API
for cryptographic use cases, as well as programming examples.</p>
<div class="toctree-wrapper compound">
<p class="caption" role="heading"><span class="caption-text">Table of contents</span></p>
<ul>
<li class="toctree-l1"><a class="reference internal" href="intro.html">Kernel Crypto API Interface Specification</a><ul>
<li class="toctree-l2"><a class="reference internal" href="intro.html#introduction">Introduction</a></li>
<li class="toctree-l2"><a class="reference internal" href="intro.html#terminology">Terminology</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="api-intro.html">Scatterlist Cryptographic API</a><ul>
<li class="toctree-l2"><a class="reference internal" href="api-intro.html#introduction">Introduction</a></li>
<li class="toctree-l2"><a class="reference internal" href="api-intro.html#details">Details</a></li>
<li class="toctree-l2"><a class="reference internal" href="api-intro.html#developer-notes">Developer Notes</a></li>
<li class="toctree-l2"><a class="reference internal" href="api-intro.html#adding-new-algorithms">Adding New Algorithms</a></li>
<li class="toctree-l2"><a class="reference internal" href="api-intro.html#bugs">Bugs</a></li>
<li class="toctree-l2"><a class="reference internal" href="api-intro.html#further-information">Further Information</a></li>
<li class="toctree-l2"><a class="reference internal" href="api-intro.html#authors">Authors</a></li>
<li class="toctree-l2"><a class="reference internal" href="api-intro.html#credits">Credits</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="architecture.html">Kernel Crypto API Architecture</a><ul>
<li class="toctree-l2"><a class="reference internal" href="architecture.html#cipher-algorithm-types">Cipher algorithm types</a></li>
<li class="toctree-l2"><a class="reference internal" href="architecture.html#ciphers-and-templates">Ciphers And Templates</a></li>
<li class="toctree-l2"><a class="reference internal" href="architecture.html#synchronous-and-asynchronous-operation">Synchronous And Asynchronous Operation</a></li>
<li class="toctree-l2"><a class="reference internal" href="architecture.html#crypto-api-cipher-references-and-priority">Crypto API Cipher References And Priority</a></li>
<li class="toctree-l2"><a class="reference internal" href="architecture.html#key-sizes">Key Sizes</a></li>
<li class="toctree-l2"><a class="reference internal" href="architecture.html#cipher-allocation-type-and-masks">Cipher Allocation Type And Masks</a></li>
<li class="toctree-l2"><a class="reference internal" href="architecture.html#internal-structure-of-kernel-crypto-api">Internal Structure of Kernel Crypto API</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="async-tx-api.html">Asynchronous Transfers/Transforms API</a><ul>
<li class="toctree-l2"><a class="reference internal" href="async-tx-api.html#introduction">1. Introduction</a></li>
<li class="toctree-l2"><a class="reference internal" href="async-tx-api.html#genealogy">2.Genealogy</a></li>
<li class="toctree-l2"><a class="reference internal" href="async-tx-api.html#usage">3. Usage</a></li>
<li class="toctree-l2"><a class="reference internal" href="async-tx-api.html#driver-development-notes">4. Driver Development Notes</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="asymmetric-keys.html">Asymmetric / Public-key Cryptography Key Type</a><ul>
<li class="toctree-l2"><a class="reference internal" href="asymmetric-keys.html#overview">Overview</a></li>
<li class="toctree-l2"><a class="reference internal" href="asymmetric-keys.html#key-identification">Key Identification</a></li>
<li class="toctree-l2"><a class="reference internal" href="asymmetric-keys.html#accessing-asymmetric-keys">Accessing Asymmetric Keys</a></li>
<li class="toctree-l2"><a class="reference internal" href="asymmetric-keys.html#asymmetric-key-subtypes">Asymmetric Key Subtypes</a></li>
<li class="toctree-l2"><a class="reference internal" href="asymmetric-keys.html#instantiation-data-parsers">Instantiation Data Parsers</a></li>
<li class="toctree-l2"><a class="reference internal" href="asymmetric-keys.html#keyring-link-restrictions">Keyring Link Restrictions</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="devel-algos.html">Developing Cipher Algorithms</a><ul>
<li class="toctree-l2"><a class="reference internal" href="devel-algos.html#registering-and-unregistering-transformation">Registering And Unregistering Transformation</a></li>
<li class="toctree-l2"><a class="reference internal" href="devel-algos.html#single-block-symmetric-ciphers-cipher">Single-Block Symmetric Ciphers [CIPHER]</a></li>
<li class="toctree-l2"><a class="reference internal" href="devel-algos.html#multi-block-ciphers">Multi-Block Ciphers</a></li>
<li class="toctree-l2"><a class="reference internal" href="devel-algos.html#hashing-hash">Hashing [HASH]</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="userspace-if.html">User Space Interface</a><ul>
<li class="toctree-l2"><a class="reference internal" href="userspace-if.html#introduction">Introduction</a></li>
<li class="toctree-l2"><a class="reference internal" href="userspace-if.html#user-space-api-general-remarks">User Space API General Remarks</a></li>
<li class="toctree-l2"><a class="reference internal" href="userspace-if.html#in-place-cipher-operation">In-place Cipher operation</a></li>
<li class="toctree-l2"><a class="reference internal" href="userspace-if.html#message-digest-api">Message Digest API</a></li>
<li class="toctree-l2"><a class="reference internal" href="userspace-if.html#symmetric-cipher-api">Symmetric Cipher API</a></li>
<li class="toctree-l2"><a class="reference internal" href="userspace-if.html#aead-cipher-api">AEAD Cipher API</a></li>
<li class="toctree-l2"><a class="reference internal" href="userspace-if.html#random-number-generator-api">Random Number Generator API</a></li>
<li class="toctree-l2"><a class="reference internal" href="userspace-if.html#zero-copy-interface">Zero-Copy Interface</a></li>
<li class="toctree-l2"><a class="reference internal" href="userspace-if.html#setsockopt-interface">Setsockopt Interface</a></li>
<li class="toctree-l2"><a class="reference internal" href="userspace-if.html#user-space-api-example">User space API example</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="crypto_engine.html">Crypto Engine</a><ul>
<li class="toctree-l2"><a class="reference internal" href="crypto_engine.html#overview">Overview</a></li>
<li class="toctree-l2"><a class="reference internal" href="crypto_engine.html#requirement">Requirement</a></li>
<li class="toctree-l2"><a class="reference internal" href="crypto_engine.html#order-of-operations">Order of operations</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="api.html">Programming Interface</a><ul>
<li class="toctree-l2"><a class="reference internal" href="api-skcipher.html">Symmetric Key Cipher</a></li>
<li class="toctree-l2"><a class="reference internal" href="api-aead.html">Authenticated Encryption With Associated Data (AEAD)</a></li>
<li class="toctree-l2"><a class="reference internal" href="api-digest.html">Message Digest</a></li>
<li class="toctree-l2"><a class="reference internal" href="api-rng.html">Random Number Generator (RNG)</a></li>
<li class="toctree-l2"><a class="reference internal" href="api-akcipher.html">Asymmetric Cipher</a></li>
<li class="toctree-l2"><a class="reference internal" href="api-sig.html">Asymmetric Signature</a></li>
<li class="toctree-l2"><a class="reference internal" href="api-kpp.html">Key-agreement Protocol Primitives (KPP)</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="api-samples.html">Code Examples</a><ul>
<li class="toctree-l2"><a class="reference internal" href="api-samples.html#code-example-for-symmetric-key-cipher-operation">Code Example For Symmetric Key Cipher Operation</a></li>
<li class="toctree-l2"><a class="reference internal" href="api-samples.html#code-example-for-use-of-operational-state-memory-with-shash">Code Example For Use of Operational State Memory With SHASH</a></li>
<li class="toctree-l2"><a class="reference internal" href="api-samples.html#code-example-for-random-number-generator-usage">Code Example For Random Number Generator Usage</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="descore-readme.html">Fast &amp; Portable DES encryption &amp; decryption</a><ul>
<li class="toctree-l2"><a class="reference internal" href="descore-readme.html#motivation-and-history">motivation and history</a></li>
<li class="toctree-l2"><a class="reference internal" href="descore-readme.html#porting-notes">porting notes</a></li>
<li class="toctree-l2"><a class="reference internal" href="descore-readme.html#optional-performance-optimizations">OPTIONAL performance optimizations</a></li>
<li class="toctree-l2"><a class="reference internal" href="descore-readme.html#coding-notes">coding notes</a></li>
<li class="toctree-l2"><a class="reference internal" href="descore-readme.html#special-efficient-data-format">special efficient data format</a></li>
<li class="toctree-l2"><a class="reference internal" href="descore-readme.html#getting-it-to-compile-on-your-machine">Getting it to compile on your machine</a></li>
<li class="toctree-l2"><a class="reference internal" href="descore-readme.html#speeding-up-kerberos-and-or-its-des-library">Speeding up kerberos (and/or its des library)</a></li>
<li class="toctree-l2"><a class="reference internal" href="descore-readme.html#other-uses">Other uses</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="device_drivers/index.html">Hardware Device Driver Specific Documentation</a><ul>
<li class="toctree-l2"><a class="reference internal" href="device_drivers/octeontx2.html">octeontx2 devlink support</a></li>
</ul>
</li>
<li class="toctree-l1"><a class="reference internal" href="krb5.html">Kerberos V Cryptography API</a><ul>
<li class="toctree-l2"><a class="reference internal" href="krb5.html#overview">Overview</a></li>
<li class="toctree-l2"><a class="reference internal" href="krb5.html#encoding-type">Encoding Type</a></li>
<li class="toctree-l2"><a class="reference internal" href="krb5.html#key-derivation">Key Derivation</a></li>
<li class="toctree-l2"><a class="reference internal" href="krb5.html#crypto-functions">Crypto Functions</a></li>
<li class="toctree-l2"><a class="reference internal" href="krb5.html#the-krb5enc-aead-algorithm">The krb5enc AEAD algorithm</a></li>
</ul>
</li>
</ul>
</div>
</section>


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