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>LIV. hash Functions</H1
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><A
NAME="hash.intro"
>简介</A
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><P
> Message Digest (hash) engine. Allows direct or incremental processing
of arbitrary length messages using a variety of hashing algorithms.
</P
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CLASS="section"
><H1
CLASS="section"
><A
NAME="hash.requirements"
>需求</A
></H1
><P
> The Hash extension requires no external libraries and is enabled by
default as of PHP 5.1.2. It may be explicitly disabled by using the
--disable-hash switch to configure. Earlier versions of PHP may
incorporate the Hash extension by installing the
<A
HREF="http://pecl.php.net/package/hash"
TARGET="_top"
>PECL module</A
>.
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><A
NAME="hash.resources"
>资源类型</A
></H1
><P
> This extension defines a Hashing Context resource returned by
<A
HREF="function.hash-init.html"
><B
CLASS="function"
>hash_init()</B
></A
>.
</P
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><A
NAME="hash.constants"
>预定义常量</A
></H1
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>以下常量由本扩展模块定义，因此只有在本扩展模块被编译到
PHP 中，或者在运行时被动态加载后才有效。</P
><P
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><DT
><TT
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><B
>HASH_HMAC</B
></TT
>
(<A
HREF="language.types.integer.html"
><B
CLASS="type"
>integer</B
></A
>)</DT
><DD
><P
> Optional flag for <A
HREF="function.hash-init.html"
><B
CLASS="function"
>hash_init()</B
></A
>.
Indicates that the HMAC digest-keying algorithm should be
applied to the current hashing context.
</P
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><DT
><B
>目录</B
></DT
><DT
><A
HREF="function.hash-algos.html"
>hash_algos</A
> -- Return a list of registered hashing algorithms</DT
><DT
><A
HREF="function.hash-file.html"
>hash_file</A
> -- Generate a hash value using the contents of a given file</DT
><DT
><A
HREF="function.hash-final.html"
>hash_final</A
> -- Finalize an incremental hash and return resulting digest</DT
><DT
><A
HREF="function.hash-hmac-file.html"
>hash_hmac_file</A
> -- Generate a keyed hash value using the HMAC method and the contents of a given file</DT
><DT
><A
HREF="function.hash-hmac.html"
>hash_hmac</A
> -- Generate a keyed hash value using the HMAC method</DT
><DT
><A
HREF="function.hash-init.html"
>hash_init</A
> -- Initialize an incremental hashing context</DT
><DT
><A
HREF="function.hash-update-file.html"
>hash_update_file</A
> -- Pump data into an active hashing context from a file</DT
><DT
><A
HREF="function.hash-update-stream.html"
>hash_update_stream</A
> -- Pump data into an active hashing context from an open stream</DT
><DT
><A
HREF="function.hash-update.html"
>hash_update</A
> -- Pump data into an active hashing context</DT
><DT
><A
HREF="function.hash.html"
>hash</A
> -- Generate a hash value (message digest)</DT
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