What is the Mhash in PHP?

[The Recruiter]

Hello friends,
I have done the basic things that are required for PHP programming language. Now I am studying about the extensions that are used for a cryptography. In that I have not understood about the Mhash, so thought to take some help from you guys.!! Please tell me what is the Mhash in PHP? Thanks in Advance.!!

[Viensterrr]

These functions are intended to work with "mhash. Mhash can be used to create a checksum, hash and more. This set of functions is an interface to the mhash library. Mhash accepts many different algorithms, like 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 an algorithm from PHP with constant MHASH_HASHNAME. For example, to access TIGER algorithm, you can use the constant MHASH_TIGER. This extension is obsolete. Please use the extension Hash instead.

[MELTRONICS]

You will need to compile PHP with - with-mhash [= DIR] to enable this extension. DIR is the installation folder for the mhash library. Since PHP 5.3.0, mhash extension is emulated through extension Hash. Also, the option to specify the installation folder mhash has no effect, and this extension requires the installation of the extension for hash function. DIR is not the installation directory, it is the directory that contains the compiled source files. You should keep in mind that this extension does not define any configuration directive.

[Allan.d]

The following are the Predefined Constants which are defined by this extension, and are only available when the extension has been compiled into PHP or dynamically loaded at runtime. Here is a list of modes that are supported by mhash :

• MHASH_ADLER32
• MHASH_CRC32
• MHASH_CRC32B
• MHASH_GOST
• MHASH_HAVAL128
• MHASH_HAVAL160
• MHASH_HAVAL192
• MHASH_HAVAL256
• MHASH_MD4
• MHASH_MD5

[Reegan]

I am providing you the Mhash Functions, that can be very useful while doing the coding :

• mhash_count - Get the maximum hash identifier
• mhash_get_block_size - Returns the blocksize of the hash
• mhash_get_hash_name - Returns the name of the hash
• mhash_keygen_s2k - Generates a key
• mhash - Compute hash

[CodGuru]

The following is an example of the computing the MD5 digest and hmac, and also prints it out as Hex :

<?php
$input = "So what are you doing?";
$hash = mhash(MHASH_MD5, $input);
echo "The hash is " . bin2hex($hash) . "<br />\n";
$hash = mhash(MHASH_MD5, $input, "Jefe");
echo "The hmac is " . bin2hex($hash) . "<br />\n";
?>