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<title>
librandombytes: Install</title>
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<div class=headline>
librandombytes</div>
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<div class="navt away"><a href=index.html>Intro</a>
</div><div class="navt away"><a href=download.html>Download</a>
</div><div class="navt here">Install
</div><div class="navt away"><a href=api.html>API</a>
</div><div class="navt away"><a href=security.html>Security</a>
</div><div class="navt away"><a href=license.html>License</a>
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<p>Prerequisites: <code>python3</code>; <code>gcc</code> and/or <code>clang</code>; OpenSSL. Currently
tested only under Linux, but porting to other systems shouldn't be
difficult.</p>
<h3>For sysadmins</h3>
<p>To install in <code>/usr/local/{include,lib,bin}</code>:</p>
<pre><code>./configure && make -j8 install
</code></pre>
<p>If you're running an old Linux system and see that the <code>randombytes-info</code>
output says <code>randombytes source kernel-devurandom</code> (this will happen on
Linux kernels before 3.17), add the lines</p>
<pre><code>dd count=1 bs=64 if=/dev/random of=/dev/urandom status=none \
&& findmnt -t tmpfs -T /var/run >/dev/null \
&& touch /var/run/urandom-ready &
</code></pre>
<p>to your boot scripts to improve librandombytes startup time. On new
Linux systems, <code>randombytes-info</code> should instead say <code>kernel-getrandom</code>
and startup time should be fine in any case, unaffected by these lines.</p>
<p>If you're running a Linux virtual machine (old or new) and see startup
delays, you probably need the host to provide <code>virtio-rng</code>.</p>
<h3>For developers with an unprivileged account</h3>
<p>Typically you'll already have</p>
<pre><code>export LD_LIBRARY_PATH="$HOME/lib"
export LIBRARY_PATH="$HOME/lib"
export CPATH="$HOME/include"
export PATH="$HOME/bin:$PATH"
</code></pre>
<p>in <code>$HOME/.profile</code>. To install in <code>$HOME/{include,lib,bin}</code>:</p>
<pre><code>./configure --prefix=$HOME && make -j8 install
</code></pre>
<h3>For distributors creating a package</h3>
<p>Run</p>
<pre><code>./configure --prefix=/usr && make -j8
</code></pre>
<p>and then follow your usual packaging procedures for the
<code>build/0/package</code> files:</p>
<pre><code>build/0/package/man/man3/randombytes.3
build/0/package/man/man1/randombytes-info.1
build/0/package/include/randombytes.h
build/0/package/lib/librandombytes*
build/0/package/bin/randombytes-info
</code></pre>
<p>Note that <code>librandombytes-kernel</code> and <code>librandombytes-openssl</code> are
alternative implementations of the same librandombytes API. There are
default symlinks to <code>librandombytes-kernel</code>, but you should allow the
sysadmin to change these symlinks to <code>librandombytes-openssl</code> by simply
installing a <code>librandombytes-openssl</code> package. The OpenSSL dependency is
for <code>librandombytes-openssl</code>; the rest of librandombytes is independent
of OpenSSL.</p>
<h3>More options</h3>
<p>You can run</p>
<pre><code>./configure --host=amd64
</code></pre>
<p>to override <code>./configure</code>'s guess of the architecture that it should
compile for. However, cross-compilers aren't yet selected automatically.</p>
<p>Inside the <code>build</code> directory, <code>0</code> is symlinked to <code>amd64</code> for
<code>--host=amd64</code>. Running <code>make clean</code> removes <code>build/amd64</code>. Re-running
<code>./configure</code> automatically starts with <code>make clean</code>.</p>
<p>A subsequent <code>./configure --host=arm64</code> will create <code>build/arm64</code> and
symlink <code>0 -> arm64</code>, without touching an existing <code>build/amd64</code>.</p>
<p>Compilers tried are listed in <code>compilers/default</code>. Each compiler
includes <code>-fPIC</code> to create a shared library and <code>-fwrapv</code> to switch to a
slightly less dangerous version of C; also, <code>-fvisibility=hidden</code> is
added automatically to hide non-public symbols in the library. The first
compiler that seems to work is used to compile everything.</p><hr><font size=1><b>Version:</b>
This is version 2024.03.18 of the "Install" web page.
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