hash_hmac

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

hash_hmac — Generate a keyed hash value using the HMAC method

Description

hash_hmac ( string $algo , string $data , string $key [, bool $binary = false ] ) : string|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.
binary: 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 binary is set to true in which case the raw binary representation of the message digest is returned. Returns false when algo is unknown or is a non-cryptographic hash function.

Changelog

Version	Description
7.2.0	Usage of non-cryptographic hash functions (adler32, crc32, crc32b, fnv132, fnv1a32, fnv164, fnv1a64, joaat) was disabled.

Examples

Example #1 hash_hmac() example

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

The above example will output:

b8e7ae12510bdfb1812e463a7f086122cf37e4f7