Hello folks! welcome back to a new edition of our tutorial on PHP. In this tutorial guide, we are going to be studying about the PHP hash_hmac_file() Function.
The built-in PHP hash_hmac_file() function is used in generating keyed hash value for the given file content making use of HMAC method.
HMAC is an acronym which 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 hash the file contents given.
The built-in PHP hash_hmac_file() function is used in generating keyed hash value for the given file content making use of HMAC method.
HMAC is an acronym which 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 hash the file contents given.
Syntax
Following below is the syntax to use this function -
hash_hmac_file ( string $algo , string $filename , string $key [, bool $raw_output = FALSE ] ) : string
READ: PHP | Hash Functions
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 | filename The filepath to get the file contents. |
3 | key Secret key to generate HMAC variant 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 PHP function works from PHP version greater than 5.1.2.
Example1
The following example below demonstrates the usage of hash_hmac_file() function -
<?php file_put_contents('file2.txt', 'Welcome to Webdesigntutorialz'); echo hash_hmac_file('md5', 'file2.txt', 'anysecretkey'); ?>
Output
When the above code is executed, it will produce the following result -
e9768f4407dcb22fb99cb6c4449f1067
Example2
The example below shows the difference in the PHP hash_hmac_file() output when the file contents are changed -
<?php file_put_contents('abc.txt', 'Hello'); echo hash_hmac_file('sha256', 'abc.txt', 'mysecretkey'); echo "<br/><br/>"; file_put_contents('abc.txt', 'World'); echo hash_hmac_file('md5', 'abc.txt', 'anysecretkey'); ?>
Output
When the above code is executed, it will produce the following result -
362a60a6ef4e35f9559304a6b5372b070c97ba33cb4a747503c9c58b5c85e6db2652fb7ccf4cff91df4f08add44b93b2
Example3
The example below shows the difference in hash_file() and hash_hmac_file() output -
<?php file_put_contents('filetest.txt', 'Welcome to Webdesigntutorialz'); echo hash_file('sha256', 'filetest.txt'); echo "<br/><br/>"; file_put_contents('abc.txt', 'Welcome to Webdesigntutorialz'); echo hash_hmac_file('sha256', 'abc.txt', 'mysecretkey'); ?>
Output
When the above code is executed, it will produce the following result -
b952e8666ddb57f4b80a70041a9bc151166dd11d4aaf1393c243cf720841be77<br/><br/>b6f6f03642e61cc076d4e2def5db4048c4bb2be8308a76190e346831a6301508
READ: PHP | hash() Function
Alright guys! This is where we are rounding up for this tutorial post. In our next tutorial guide, we are going to be discussing about the PHP hash_pbkdf2() Function.
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