Php/docs/function.hash-hmac

• PHP Manual
• Hash Functions
• Generate a keyed hash value using the HMAC method

hash_hmac

(PHP 5 >= 5.1.2, PHP 7, PECL hash >= 1.1)

hash_hmac — Generate a keyed hash value using the HMAC method

Description

hash_hmac ( string $algo , string $data , string $key [, bool $binary = FALSE ] ) : string|false

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. FALSE outputs 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. Returns FALSE when algo is unknown or is a non-cryptographic hash function.

Changelog

Version	Description
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

<?phpecho 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