mirror of
https://github.com/sigmasternchen/php-doc-en
synced 2025-03-30 15:58:55 +00:00
79 lines
2.2 KiB
XML
79 lines
2.2 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<refentry xml:id="function.sodium-memcmp" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
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<refnamediv>
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<refname>sodium_memcmp</refname>
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<refpurpose>Test for equality in constant-time</refpurpose>
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</refnamediv>
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<refsect1 role="description">
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&reftitle.description;
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<methodsynopsis>
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<type>int</type><methodname>sodium_memcmp</methodname>
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<methodparam><type>string</type><parameter>string1</parameter></methodparam>
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<methodparam><type>string</type><parameter>string2</parameter></methodparam>
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</methodsynopsis>
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<para>
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Compare two strings in constant-time.
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</para>
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<para>
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In practice, you almost always want to use <function>hash_equals</function> instead,
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since it provides the same logic but returns a <type>bool</type> instead of an
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<type>int</type>. However, if you're using the return value of a comparison in a
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calculation that's timing-sensitive, and worried about timing leaks with bool-to-int
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conversions, <function>sodium_memcmp</function> is an ideal replacement.
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</para>
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</refsect1>
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<refsect1 role="parameters">
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&reftitle.parameters;
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<variablelist>
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<varlistentry>
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<term><parameter>string1</parameter></term>
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<listitem>
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<para>
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String to compare
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>string2</parameter></term>
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<listitem>
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<para>
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Other string to compare
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1 role="returnvalues">
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&reftitle.returnvalues;
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<para>
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Returns <literal>0</literal> if both strings are equal; <literal>-1</literal> otherwise.
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</para>
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</refsect1>
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</refentry>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"~/.phpdoc/manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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