hash_hmac_file

(PHP 5 >= 5.1.2, PHP 7, PHP 8, PECL hash >= 1.1)

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

Descrizione

hash_hmac_file(
    string $algo,
    string $filename,
    string $key,
    bool $binary = false
): string|false

Elenco dei parametri

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.

binary

When set to true, outputs raw binary data. false outputs lowercase hexits.

Valori restituiti

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 if the file filename cannot be read.

Errori/Eccezioni

Throws a ValueError exception if algo is unknown or is a non-cryptographic hash function.

Log delle modifiche

Versione Descrizione
8.0.0 Now throws a ValueError exception if algo is unknown or is a non-cryptographic hash function; previously, false was returned instead.
7.2.0 Usage of non-cryptographic hash functions (adler32, crc32, crc32b, fnv132, fnv1a32, fnv164, fnv1a64, joaat) was disabled.

Esempi

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('sha256', 'example.txt', 'secret');
?>

Il precedente esempio visualizzerĂ :

9c5c42422b03f0ee32949920649445e417b2c634050833c5165704b825c2a53b

Vedere anche:

  • 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

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