hash_hmac

(PHP 5 >= 5.1.2, PHP 7, PECL hash >= 1.1)

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_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.

Returns:

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.

Examples:

hash_hmac() example

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

The above example will output:

b8e7ae12510bdfb1812e463a7f086122cf37e4f7