PHP Conference Nagoya 2025

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

Descrição

hash_hmac_file(
    string $algo,
    string $filename,
    #[\SensitiveParameter] string $key,
    bool $binary = false
): string|false

Parâmetros

algo

Name of selected hashing algorithm (e.g. "sha256"). For a list of supported algorithms see hash_hmac_algos().

Nota:

Non-cryptographic hash functions are not allowed.

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.

Valor Retornado

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.

Erros/Exceções

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

Registro de Alterações

Versão Descrição
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.

Exemplos

Exemplo #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');
?>

O exemplo acima produzirá:

9c5c42422b03f0ee32949920649445e417b2c634050833c5165704b825c2a53b

Veja Também

  • hash_hmac() - Generate a keyed hash value using the HMAC method
  • hash_hmac_algos() - Return a list of registered hashing algorithms suitable for hash_hmac
  • hash_init() - Initialize an incremental hashing context
  • hash_equals() - Timing attack safe string comparison

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