Definition and Usage
The hash_hmac() function generates keyed hash values using the HMAC algorithm.
HMAC is an abbreviation for keyed-hash message authentication code or hash-based message authentication code. It makes use of cryptographic hash functions like md5, sha-256, and a secret key to return the message digest hash of the given data.
Syntax
hash_hmac ( string $algo , string $data , string $key [, bool $raw_output = FALSE ] ) : string
Parameters
| Parameter | Description |
|---|---|
| algo | Name of the hashing algorithm. Hash supports a wide range of algorithms, including md5, sha256, and others. To see the complete list of available algorithms, look for hash_hmac_algos() |
| data | The data you want to hash. |
| key | The secret key to generate HMAC variant of the message digest. |
| raw_output | The value is false by default, thus it returns lowercase hexits. It will return raw binary data if the value is true. |
Return Values
The hash_hmac() method returns a string with a computed message digest in lowercase hexits. If raw_output is set to false, raw binary data will be returned.
PHP Version
This function will work with PHP versions greater than 5.1.2.
Example 1
Using hash_hmac() −
<?php
echo hash_hmac('md5', 'PHP - Hash hmac() Function', 'any_secretkey');
?>
Output
This will produce the following result −
65f76c2b226b566b03a467bbcfba6a58
Example 2
Using hash_hmac() with ripemd128 algorithm −
<?php
echo hash_hmac('ripemd128', 'PHP - Hash hmac() Function', 'any_secretkey');
?>
Output
This will produce the following result −
3955f952d6326196099da6f70bda9e2d
Example 3
To create hash_hmac with raw output set to true −
<?php
echo hash_hmac('ripemd128', 'PHP - Hash hmac() Function', 'any_secretkey', true);
?>
Output
This will produce the following result −
9U'R'2a' '''
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