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git-svn-id: https://svn.php.net/repository/phpdoc/es/trunk@331051 c90b9560-bf6c-de11-be94-00142212c4b1
121 lines
3.7 KiB
XML
121 lines
3.7 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<!-- EN-Revision: 3e6a2269a85362c2a06c3623b9e19dd28c6dafe9 Maintainer: seros Status: ready -->
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<!-- Reviewed: no -->
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<!-- Generated by xml_proto.php v2.3. Found in /scripts directory of phpdoc. -->
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<refentry xml:id="function.hash-init" xmlns="http://docbook.org/ns/docbook">
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<refnamediv>
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<refname>hash_init</refname>
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<refpurpose>Inicializa un contexto incremental para cifrar</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>resource</type><methodname>hash_init</methodname>
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<methodparam><type>string</type><parameter>algo</parameter></methodparam>
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<methodparam choice="opt"><type>int</type><parameter>options</parameter><initializer>0</initializer></methodparam>
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<methodparam choice="opt"><type>string</type><parameter>key</parameter><initializer>&null;</initializer></methodparam>
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</methodsynopsis>
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</refsect1>
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<refsect1 role="parameters">
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&reftitle.parameters;
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<para>
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<variablelist>
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<varlistentry>
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<term><parameter>algo</parameter></term>
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<listitem>
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<para>
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Nombre del algoritmo de cifrado seleccionado (es decir "md5", "sha256", "haval160,4", etc..). Para una lista de los algoritmos admitidos vése <function>hash_algos</function>.
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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>options</parameter></term>
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<listitem>
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<para>
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Configuración opcional para la generación del cifrado, normalmente soporta solo una opción:
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<constant>HASH_HMAC</constant>, en el caso de utilizar esta opción también <emphasis>deberemos</emphasis> especificar el parámetro <parameter>key</parameter>.
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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>key</parameter></term>
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<listitem>
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<para>
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Cuando se especifique <constant>HASH_HMAC</constant> en <parameter>options</parameter>, se debe suministrar una clave secreta compartida en este parámetro para ser utilizada en el método de cifrado HMAC.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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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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Devuelve un recurso de contexto para cifrado, el cual será incrementado con <function>hash_update</function>, <function>hash_update_stream</function>, <function>hash_update_file</function>, y <function>hash_final</function>.
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</para>
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</refsect1>
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<refsect1 role="examples">
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&reftitle.examples;
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<para>
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<example>
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<title>Ejemplo de contexto incremental para cifrado</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$ctx = hash_init('md5');
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hash_update($ctx, 'The quick brown fox ');
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hash_update($ctx, 'jumped over the lazy dog.');
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echo hash_final($ctx);
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?>
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]]>
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</programlisting>
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&example.outputs;
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<screen>
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<![CDATA[
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5c6ffbdd40d9556b73a21e63c3e0e904
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]]>
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</screen>
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</example>
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</para>
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</refsect1>
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<refsect1 role="seealso">
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&reftitle.seealso;
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<para>
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<simplelist>
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<member><function>hash</function></member>
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<member><function>hash_algos</function></member>
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<member><function>hash_file</function></member>
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<member><function>hash_hmac</function></member>
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<member><function>hash_hmac_file</function></member>
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</simplelist>
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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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