(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 (e.g. "sha256").
For a list of supported algorithms see hash_hmac_algos().
Note:
Non-cryptographic hash functions are not allowed.
dataMessage to be hashed.
keyShared 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