hash_file

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

hash_file — Génère une valeur de hachage en utilisant le contenu d'un fichier donné

Description

string hash_file ( string $algo , string $filename [, bool $raw_output = false ] )

Liste de paramètres

algo: Nom de l'algorithme de hachage sélectionné (c'est-à-dire "md5", "sha256", "haval160,4", etc.)
filename: URL indiquant l'emplacement du fichier qui sera haché; Supporte les enveloppes fopen().
raw_output: Lorsqu'il vaut TRUE, la sortie sera des données brutes binaires. Lorsqu'il vaut FALSE, la sortie sera des chiffres hexadécimaux en minuscule.

Valeurs de retour

Retourne une chaîne de caractères contenant l'empreinte numérique calculée en chiffre hexadécimal minuscule à moins que raw_output soit fixé à TRUE. Dans ce cas, la représentation brute binaire de l'empreinte numérique est retournée.

Exemples

Exemple #1 Exemple avec hash_file()


<?php
/* Crée un fichier pour calculer son empreinte numérique */
file_put_contents('exemple.txt', 'Le rapide goupil brun sauta par dessus le chien paresseux.');

echo hash_file('md5', 'exemple.txt');
?>

L'exemple ci-dessus va afficher :

2dfe052a8caca3db869ede6ae544cd5d

Voir aussi

hash() - Génère une valeur de hachage (empreinte numérique)
hash_hmac_file() - Génère une valeur de clé de hachage en utilisant la méthode HMAC et le contenu d'un fichier donné
hash_update_file() - Ajoute des données dans un contexte de hachage actif provenant d'un fichier
md5_file() - Calcule le md5 d'un fichier
sha1_file() - Calcule le sha1 d'un fichier

hash_final

hash_copy

[edit] Last updated: Fri, 25 May 2012

add a note User Contributed Notes hash_file

apm at domain itsmee.co.uk 10-Jul-2011 04:56


I have verified that the output of the "crc32" is the ITU I.363.5 algorithm (a.k.a. AAL5 CRC - popularised by BZIP2 but also used in ATM transmissions - the algorithm is the same as that in POSIX 1003.2-1992 in Cksum but that stuffs the size into the CRC at the end for extra measure).  However, the output is expressed in reverse order to many CRC programs.  Using the "standard" crctest.txt (numbers 1 to 9 in sequence - google it, it's not hard to find), php will output 181989fc - many other (Intel little endian) programs would output this as fc891918, hence the confusion (that I have had, at least).



The crc32b is the 32-bit Frame Check Sequence of ITU V.42 (used in Ethernet and popularised by PKZip).  The output from this CRC is popularised in Intel little endian format and would produce cbf43926 on the same file.

Anonymous 26-Apr-2011 09:55


Please take note that hash-file will throw error on files >=2GB.

chernyshevsky at hotmail dot com 22-Sep-2010 04:01


If you want to use hash_file() to get the CRC32 value of a file, use the following to unpack the hex string returned by the function to an integer (similar to crc32()):



$hash = hash_file('crc32b', $filepath);

$array = unpack('N', pack('H*', $hash));

$crc32 = $array[1];

gabri dot ns at gmail dot com 15-Sep-2010 08:58


i've browsing about crc32 recently

from http://en.wikipedia.org/wiki/Cyclic_redundancy_check

#Commonly_used_and_standardized_CRCs

it is said that ethernet and png using the same polynomial, 0x04C11DB7



so, it still unclear (for me) wich standard does 'crc32' uses

IMO, 'crc32b' is the most common used in software

PKzip us this, 7zip and SVF file use this too



to check wether an implementation is using 'crc32b',

try to hash string or file containing string:

"123456789" (without quote of course :D )

it should return CBF43926

Keisial at gmail dot com 11-Sep-2008 11:46


The 'octets reversed' you are seeing is the bug 45028 which has been fixed. http://bugs.php.net/bug.php?id=45028



The difference between crc32 and crc32b is explained on mhash man page. crc32 is the one used on ethernet, while crc32b is the one used on zip, png... They differ on the table used.

allaryin at gmail dot com 23-Jul-2008 03:16


For those who are wondering, there appears to be no fundamental difference between hash_file('md5')/hash_file('sha1') and md5_file()/sha1_file(). They produce identical output and have comparable performance.



There is, however, a difference between hash_file('crc32') and something silly like crc32(file_get_contents()).



crc32(file_get_contents())'s results are most similar to those of hash_file('crc32b'), just with the octets reversed:



<?php

$fname = "something.png";



$hash = hash_file( 'crc32', $fname );

echo "crc32  = $hash\n";



$hash = hash_file( 'crc32b', $fname );

echo "crc32b = $hash\n";



$hash = sprintf("%x",crc32(file_get_contents($fname)));

echo "manual = $hash\n";

?>



crc32  = f41d7f4e

crc32b = 7dafbba4

manual = a4bbaf7d

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