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


hash_hmac_file

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

hash_hmac_fileGenerate 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_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.

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



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