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><H1
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>XIX. Hash functions</H1
><DIV
CLASS="PARTINTRO"
><A
NAME="AEN10115"
></A
><P
>&#13;    These functions are intended to work with <A
HREF="http://sasweb.de/mhash/"
TARGET="_top"
>mhash</A
>.</P
><P
>&#13;    This is an interface to the mhash library. mhash supports a wide variety of
    hash algorithms such as MD5, SHA1, GOST, and many others.</P
><P
>&#13;    To use it, download the mhash distribution from <A
HREF="http://sasweb.de/mhash/"
TARGET="_top"
>its web site</A
> and follow the included
    installation instructions. You need to compile PHP with the <TT
CLASS="option"
>--with-mhash</TT
> parameter to enable this
    extension.</P
><P
>&#13;    mhash can be used to create checksums, message digests, and more.</P
><P
>&#13;    <TABLE
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>Example 1. Compute the SHA1 key and print it out as hex</B
></P
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><PRE
CLASS="programlisting"
>  1&nbsp;
  2&nbsp;&#60;?php
  3&nbsp;$input = "Let us meet at 9 o' clock at the secret place.";
  4&nbsp;$hash = mhash(MHASH_SHA1, $input);
  5&nbsp;
  6&nbsp;print "The hash is ".bin2hex($hash)."\n";
  7&nbsp;
  8&nbsp;?&#62;
  9&nbsp;     </PRE
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>

    This will produce:

    <TABLE
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><TD
><PRE
CLASS="programlisting"
>  1&nbsp;
  2&nbsp;The hash is d3b85d710d8f6e4e5efd4d5e67d041f9cecedafe
  3&nbsp;    </PRE
></TD
></TR
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>
	  
    For a complete list of supported hashes, refer to the documentation of
    mhash. The general rule is that you can access the hash algorithm from PHP
    with MHASH_HASHNAME. For example, to access HAVAL you use the PHP constant
    MHASH_HAVAL.</P
><P
>&#13;    Here is a list of hashes which are currently supported by mhash. If a
    hash is not listed here, but is listed by mhash as supported, you can
    safely assume that this documentation is outdated.

    <P
></P
><UL
><LI
><P
>&#13;      MHASH_MD5</P
></LI
><LI
><P
>&#13;      MHASH_SHA1</P
></LI
><LI
><P
>&#13;      MHASH_HAVAL</P
></LI
><LI
><P
>&#13;      MHASH_RIPEMD160</P
></LI
><LI
><P
>&#13;      MHASH_RIPEMD128</P
></LI
><LI
><P
>&#13;      MHASH_SNEFRU</P
></LI
><LI
><P
>&#13;      MHASH_TIGER</P
></LI
><LI
><P
>&#13;      MHASH_GOST</P
></LI
><LI
><P
>&#13;      MHASH_CRC32</P
></LI
><LI
><P
>&#13;      MHASH_CRC32B</P
></LI
></UL
></P
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><DT
><B
>Table of Contents</B
></DT
><DT
><A
HREF="function.mhash-get-hash-name.html"
>mhash_get_hash_name</A
> &#8212; Get the name of the specified hash</DT
><DT
><A
HREF="function.mhash-get-block-size.html"
>mhash_get_block_size</A
> &#8212; Get the block size of the specified hash</DT
><DT
><A
HREF="function.mhash-count.html"
>mhash_count</A
> &#8212; Get the highest available hash id</DT
><DT
><A
HREF="function.mhash.html"
>mhash</A
> &#8212; Compute hash</DT
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