(PHP 5 >= 5.1.2, PECL hash >= 1.1)
hash_hmac — Generate a keyed hash value using the HMAC method
$algo
, string $data
, string $key
[, bool $raw_output = false
] )
algo
Name of selected hashing algorithm (i.e. "md5", "sha256", "haval160,4", etc..) See hash_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.
raw_output
When set to TRUE, outputs raw binary data.
FALSE outputs lowercase hexits.
Returns a string containing the calculated message digest as lowercase hexits
unless raw_output is set to true in which case the raw
binary representation of the message digest is returned.
Example #1 hash_hmac() example
<?php
echo hash_hmac('ripemd160', 'The quick brown fox jumped over the lazy dog.', 'secret');
?>
以上例程会输出：
b8e7ae12510bdfb1812e463a7f086122cf37e4f7