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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
<!ENTITY % general-entities SYSTEM "../general.ent">
%general-entities;
]>
<sect1 id="ch-system-libxcrypt" role="wrap">
<?dbhtml filename="libxcrypt.html"?>
<sect1info condition="script">
<productname>libxcrypt</productname>
<productnumber>&libxcrypt-version;</productnumber>
<address>&libxcrypt-url;</address>
</sect1info>
<title>Libxcrypt-&libxcrypt-version;</title>
<indexterm zone="ch-system-libxcrypt">
<primary sortas="a-Libxcrypt">Libxcrypt</primary>
</indexterm>
<sect2 role="package">
<title/>
<para>The Libxcrypt package contains a modern library for one-way
hashing of passwords.</para>
<segmentedlist>
<segtitle>&buildtime;</segtitle>
<segtitle>&diskspace;</segtitle>
<seglistitem>
<seg>&libxcrypt-fin-sbu;</seg>
<seg>&libxcrypt-fin-du;</seg>
</seglistitem>
</segmentedlist>
</sect2>
<sect2 role="installation">
<title>Installation of Libxcrypt</title>
<para>Prepare Libxcrypt for compilation:</para>
<screen><userinput remap="configure">./configure --prefix=/usr \
--enable-hashes=strong,glibc \
--enable-obsolete-api=no \
--disable-static \
--disable-failure-tokens</userinput></screen>
<variablelist>
<title>The meaning of the new configure options:</title>
<varlistentry>
<term><parameter>--enable-hashes=strong,glibc</parameter></term>
<listitem>
<para>Build strong hash algorithms recommended for security use
cases, and the hash algorithms provided by traditional Glibc
<systemitem class='library'>libcrypt</systemitem> for
compatibility.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>--enable-obsolete-api=no</parameter></term>
<listitem>
<para>Disable obsolete API functions. They are not needed for
a modern Linux system built from source.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>--disable-failure-tokens</parameter></term>
<listitem>
<para>Disable failure token feature. It's needed for
compatibility with the traditional hash libraries of some
platforms, but a Linux system based on Glibc does not need
it.</para>
</listitem>
</varlistentry>
</variablelist>
<para>Compile the package:</para>
<screen><userinput remap="make">make</userinput></screen>
<para>To test the results, issue:</para>
<screen><userinput remap="test">make check</userinput></screen>
<para>Install the package:</para>
<screen><userinput remap="install">make install</userinput></screen>
<note>
<para>The instructions above disabled obsolete API functions since
no package installed by compiling from sources would link against
them at runtime. However, the only known binary-only applications
that link against these functions require ABI version 1. If you must
have such functions because of some binary-only application or to be
compliant with LSB, build the package again with the following
commands:</para>
<screen role="nodump"><userinput>make distclean
./configure --prefix=/usr \
--enable-hashes=strong,glibc \
--enable-obsolete-api=glibc \
--disable-static \
--disable-failure-tokens
make
cp -av .libs/libcrypt.so.1* /usr/lib</userinput></screen>
</note>
</sect2>
<sect2 id="contents-libxcrypt" role="content">
<title>Contents of Libxcrypt</title>
<segmentedlist>
<segtitle>Installed libraries</segtitle>
<seglistitem>
<seg>libcrypt.so</seg>
</seglistitem>
</segmentedlist>
<variablelist>
<bridgehead renderas="sect3">Short Descriptions</bridgehead>
<?dbfo list-presentation="list"?>
<?dbhtml list-presentation="table"?>
<varlistentry id="libcrypt">
<term><filename class="libraryfile">libcrypt</filename></term>
<listitem>
<para>Contains functions to hash passwords</para>
<indexterm zone="ch-system-libxcrypt libcrypt">
<primary sortas="c-libcrypt">libcrypt</primary>
</indexterm>
</listitem>
</varlistentry>
</variablelist>
</sect2>
</sect1>
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