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<?xml version="1.0" encoding="utf-8"?>
<refentry xml:id="function.sodium-crypto-core-ristretto255-from-hash" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>sodium_crypto_core_ristretto255_from_hash</refname>
<refpurpose>Maps a vector</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>string</type><methodname>sodium_crypto_core_ristretto255_from_hash</methodname>
<methodparam><type>string</type><parameter>s</parameter></methodparam>
</methodsynopsis>
<para>
Maps a 64-bytes vector <parameter>s</parameter> to a group element.
Available as of libsodium 1.0.18.
</para>
&warn.undocumented.func;
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<variablelist>
<varlistentry>
<term><parameter>s</parameter></term>
<listitem>
<para>
A 64-bytes vector.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Returns a 32-byte random &string;.
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>sodium_crypto_core_ristretto255_from_hash</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
$hashes = sodium_hex2bin(
'5d1be09e3d0c82fc538112490e35701979d99e06ca3e2b5b54bffe8b4dc772c1' .
'4d98b696a1bbfb5ca32c436cc61c16563790306c79eaca7705668b47dffe5bb6'
);
var_dump(sodium_bin2hex(sodium_crypto_core_ristretto255_from_hash($hashes)));
?>
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
string(64) "3066f82a1a747d45120d1740f14358531a8f04bbffe6a819f86dfe50f44a0a46"
]]>
</screen>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>sodium_hex2bin</function></member>
<member><function>sodium_bin2hex</function></member>
<member><function>sodium_crypto_core_ristretto255_from_hash</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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