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(PHP 5 >= 5.1.2, PHP 7, PHP 8, PECL hash >= 1.1)
hash_hmac — Generate a keyed hash value using the HMAC method
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.
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.
Throws a ValueError exception if
algo
is unknown or is a non-cryptographic hash
function.
Version | Description |
---|---|
8.0.0 |
Now throws a ValueError exception if
algo is unknown or is a
non-cryptographic hash function; previously, false was returned instead.
|
7.2.0 | Usage of non-cryptographic hash functions (adler32, crc32, crc32b, fnv132, fnv1a32, fnv164, fnv1a64, joaat) was disabled. |
Example #1 hash_hmac() example
<?php
echo hash_hmac('sha256', 'The quick brown fox jumped over the lazy dog.', 'secret');
?>
The above example will output:
9c5c42422b03f0ee32949920649445e417b2c634050833c5165704b825c2a53b