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PHP : Function Reference : Mhash Functions

Mhash Functions


These functions are intended to work with » mhash. Mhash can be used to create checksums, message digests, message authentication codes, and more.

This is an interface to the mhash library. mhash supports a wide variety of hash algorithms such as MD5, SHA1, GOST, and many others. 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 TIGER you use the PHP constant MHASH_TIGER.


This extension has been moved to the » PECL repository and is no longer bundled with PHP as of PHP 5.3.0. This extension is obsoleted by Hash.


To use it, download the mhash distribution from » its web site and follow the included installation instructions.


You need to compile PHP with the --with-mhash[=DIR] parameter to enable this extension. DIR is the mhash install directory.

Runtime Configuration

This extension has no configuration directives defined in php.ini.

Resource Types

This extension has no resource types defined.

Predefined Constants

The constants below are defined by this extension, and will only be available when the extension has either been compiled into PHP or dynamically loaded at runtime.

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 If a hash is not listed here, but is listed by mhash as supported, you can safely assume that this documentation is outdated.

  • MHASH_SHA256


Example 1325. Compute the MD5 digest and hmac and print it out as hex

= "what do ya want for nothing?";
$hash = mhash(MHASH_MD5, $input);
"The hash is " . bin2hex($hash) . "<br />\n";
$hash = mhash(MHASH_MD5, $input, "Jefe");
"The hmac is " . bin2hex($hash) . "<br />\n";

This will produce:

The hash is d03cb659cbf9192dcd066272249f8412
The hmac is 750c783e6ab0b503eaa86e310a5db738

Table of Contents

mhash_count — Get the highest available hash id
mhash_get_block_size — Get the block size of the specified hash
mhash_get_hash_name — Get the name of the specified hash
mhash_keygen_s2k — Generates a key
mhash — Compute hash

Code Examples / Notes » ref.mhash


to robert at mediamonks dot com
This will work better, in your function you can just use the constant function to pull in the actual value of MHASH_SHA512 or whatever.
function getHashNotWorking($argStrHashMethod, $argStrString)
$strHashMethod = 'MHASH_' . $argStrHashMethod;
$strHashedString = bin2hex(mhash(constant($strHashMethod), $argStrString));
return $strHashedString;
echo getHashNotWorking('SHA512', 'some string');
works how you want it.


To enable mhash on RHEL/Fedora Core/other RPM-based Linuxes without rebuilding PHP, get the php-mhash and mhash RPMs at


Since it seems that the tiger hash bug has been labeled "bogus" here is a fix to give a correct result.  I'm not a binary expert so if you come up with a better fix please let us know. Just do your MHASH_TIGER as normal then send the unaltered binary into tigerfix and you get a proper HEX return.
function tigerfix ($binary_hash) {
    $my_split = str_split($binary_hash,8);
    $my_tiger ="";
    foreach($my_split as $key => $value) {
       $my_split[$key] = strrev($value);
       $my_tiger .= $my_split[$key];
   $my_tiger_hex = bin2hex($my_tiger);
   return $my_tiger_hex;

01-aug-2001 03:13

refers to the HAVAL hash with 3 rounds.
To use HAVAL with 4 or 5 rounds, you have to
recompile the mhash library and either add
new hash names, or just change in mhash.c
the definitions of MHASH_HAVAL256,...


function getHashNotWorking($argStrHashMethod, $argStrString)
$strHashMethod = 'MHASH_' . $argStrHashMethod;
$strHashedString = bin2hex(mhash($strHashMethod, $argStrString));
return $strHashedString;
echo getHashNotWorking('SHA512', 'some string');
This will return an error about the mhash function expecting a long type instead of a string.
for ($intI = 0; $intI <= mhash_count(); $intI++)
$arrHashTypes[mhash_get_hash_name($intI)] = $intI;
function getHashWorking($argStrType, $argStrString)
global $arrHashTypes;
$strHashedString = bin2hex(mhash($arrHashTypes[$argStrType], $argStrString));
return $strHashedString;
echo getHashWorking('SHA512', 'some string');
This will return the hash with the desired hash method

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