PHP | hash_hmac() Function
January 10, 2021
Hello dear readers! welcome back to another edition of our tutorial on PHP. In this tutorial guide, we are going to be discussing about the PHP hash_hmac() Function.
The built-in hash_hmac() function is used for generating keyed hash value using HMAC method.
HMAC is an acronym which simply stands for keyed-hash message authentication code or hash-based message authentication code. It makes use of cryptographic hash function like md5, sha-256 and a secret key to return the message digest hash of the given data.
The built-in hash_hmac() function is used for generating keyed hash value using HMAC method.
HMAC is an acronym which simply stands for keyed-hash message authentication code or hash-based message authentication code. It makes use of cryptographic hash function like md5, sha-256 and a secret key to return the message digest hash of the given data.
Syntax
Following below is the syntax to use this function -
hash_hmac ( string $algo , string $data , string $key [, bool $raw_output = FALSE ] ) : string
Parameter Details
Sr.No | Parameter & Description |
---|---|
1 | algo Name of the hashing algorithm. There is a big list of algorithm available with hash, some important ones are md5, sha256, etc. To get the full list of algorithms supported check for hash_hmac_algos() |
2 | data The data you want to hash. |
3 | key Secret key to generate HMAC vaiant of the message digest. |
4 | raw_output By default, the value is false and hence it returns lowercase hexits values. If the value is true, it will return raw binary data. |
Return Value
This built-in PHP function returns a strings of calculated message digest that will be in the form of lowercase hexits if raw_output is false, otherwise it will return raw binary data.
PHP Version
This built-in function works from PHP version greater than 5.1.2.
Example1
The following below is an example which demonstrates the usage of PHP hash_hmac() function -
<?php echo hash_hmac('md5', 'Welcome to Webdesigntutorialz', 'any_secretkey'); ?>
Output
When the above code is executed, it will produce the following result -
82b39d2ebabc8828e56c660f6fe7c20a
Example2
Using the built-in hash_hmac() function with ripemd128 algorithm -
<?php echo hash_hmac('ripemd128', 'Welcome to Webdesigntutorialz', 'any_secretkey'); ?>
Output
When the above code is executed, it will produce the following result -
286baab9161f7eb45c9a4435ff7d0a35
Example3
Following example demonstrates how to generate hash_hmac with raw_output set as TRUE -
<?php echo hash_hmac('ripemd128', 'Welcome to Webdesigntutorialz', 'any_secretkey', true); ?>
Output
When the above code is executed, it will produce the following result -
ɵƋr��1�RO�F���
Alright guys! This is where we are rounding up for this tutorial post. In our next tutorial, we will discuss about the PHP hash_hmac_algos() Function.
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