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PHP Manual


hash_hmac

(PHP 5 >= 5.1.2, PECL hash >= 1.1)

hash_hmacGenerate a keyed hash value using the HMAC method

Description

string hash_hmac ( string $algo , string $data , string $key [, bool $raw_output = false ] )

Parameters

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.

Return Values

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.

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_algos() - Return a list of registered hashing algorithms
  • 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




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