hash_hmac
(PHP 5 >= 5.1.2, PHP 7, PHP 8, PECL hash >= 1.1)
hash_hmac — Generate a keyed hash value using the HMAC method
Description
string
$algo,string
$data,string
$key,bool
$binary = false): string
Parameters
-
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.falseoutputs lowercase hexits.
Return Values
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.
Changelog
| Version | Description |
|---|---|
| 8.0.0 |
hash_hmac() 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. |
Examples
Example #1 hash_hmac() example
<?php
echo hash_hmac('ripemd160', 'The quick brown fox jumped over the lazy dog.', 'secret');
?>
The above example will output:
b8e7ae12510bdfb1812e463a7f086122cf37e4f7
See Also
- hash() - Generate a hash value (message digest)
- hash_hmac_algos() - Return a list of registered hashing algorithms suitable for hash_hmac
- hash_init() - Initialize an incremental hashing context
- hash_hmac_file() - Generate a keyed hash value using the HMAC method and the contents of a given file
