hash_hmac in php

hash_hmac — Generate a keyed hash value using the HMAC method

string hash_hmac ( string $algo , string $data , string $key [, bool $raw_output = FALSE ] )

Parameters ::

algo

Name of selected hashing algorithm (i.e. "md5", "sha256", "haval160,4", etc..) See hash_hmac_algos() for a list of supported algorithms.

data

Message to be hashed.

key

Shared secret key used for generating the HMAC variant of the message digest.

raw_output

When set to TRUE, outputs raw binary data. FALSE outputs lowercase hexits.

Return Values ::

Returns a string containing the calculated message digest as lowercase hexits unless raw_output is set to true in which case the raw binary representation of the message digest is returned. Returns FALSE when algo is unknown.

# EXAMPLE::

<?php

echo hash_hmac('ripemd160', 'The quick brown fox jumped over the lazy dog.', 'secret');

?>

# The above example will output:

b8e7ae12510bdfb1812e463a7f086122cf37e4f7