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PHP hash_hmac_file

PHP original manual for hash_hmac_file [ show | php.net ]

hash_hmac_file

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

hash_hmac_file — Generate a keyed hash value using the HMAC method and the contents of a given file

Description

string hash_hmac_file ( string $algo , string $filename , string $key [, bool $raw_output = 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.

filename

URL describing location of file to be hashed; Supports fopen wrappers.

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. Returns FALSE when algo is unknown or is a non-cryptographic hash function, or if the file filename cannot be read.

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_file() example

<?php
/* Create a file to calculate hash of */
file_put_contents('example.txt', 'The quick brown fox jumped over the lazy dog.');

echo hash_hmac_file('md5', 'example.txt', 'secret');
?>

The above example will output:

7eb2b5c37443418fc77c136dd20e859c

See Also

  • hash_hmac_algos() - Return a list of registered hashing algorithms suitable for hash_hmac
  • hash_hmac() - Generate a keyed hash value using the HMAC method
  • hash_file() - Generate a hash value using the contents of a given file