Fonctions Hash
Note that some of the hash algorithms provided are considered weak (e.g., md5, sha1 and haval128,3). If you have a choice in the matter, use ripemd160, whirlpool or tiger192,4.
hash
(PHP 5 >= 5.1.2, PECL hash:1.1-1.5)
hash — Génère une valeur de hachage (empreinte numérique)
Description
string hash
( string $algo
, string $data
[, bool $raw_output
] )
Liste de paramètres
- algo
-
Nom de l'algorithme de hachage sélectionné (c'est-à-dire "md5", "sha256", "haval160,4", etc.)
- data
-
Message à être haché.
- 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. La valeur par défaut est FALSE.
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()
<?php
echo hash('ripemd160', 'Le rapide goupil brun sauta par dessus le chien paresseux.');
?>
L'exemple ci-dessus va afficher :
cdb8426cb020896cea1d040e62a0f8cf9f5b4226
add a note
User Contributed Noteshash
The
27-May-2008 03:52
27-May-2008 03:52
inspiration3 at gmail dot com
04-May-2008 08:12
04-May-2008 08:12
Another comprehensive benchmark script that orders results from best to worst and includes the crc32(), md5() and sha1() standalone functions:
<?php
define('HASH_TIMES', 1000);
define('HASH_DATA', 'The quick brown fox jumped over!'); // 32 bytes
header('Content-Type: text/plain');
echo 'Testing ' . strlen(HASH_DATA) . ' bytes of data over ' . HASH_TIMES . " iterations:\n";
foreach (hash_algos() as $algo) {
$time = microtime(1);
for ($i = 0; $i < HASH_TIMES; $i++) hash($algo, HASH_DATA);
$results[$algo] = microtime(1) - $time;
}
$time = microtime(1); for ($i = 0; $i < HASH_TIMES; $i++) crc32(HASH_DATA); $results['crc32()'] = microtime(1) - $time;
$time = microtime(1); for ($i = 0; $i < HASH_TIMES; $i++) md5(HASH_DATA); $results['md5()'] = microtime(1) - $time;
$time = microtime(1); for ($i = 0; $i < HASH_TIMES; $i++) sha1(HASH_DATA); $results['sha1()'] = microtime(1) - $time;
asort($results, SORT_NUMERIC);
foreach ($results as $algo => $time) echo "\n$time\t$algo";
?>
Marcus
27-Apr-2008 05:15
27-Apr-2008 05:15
A upgrade of dani88elx's performance test, this time grading them by speed (fastest first) and comparing times between hex and raw data.
<?
function testAlgos() {
$algos = hash_algos();
$word="This will be crypted by all different algoritms";
$results = array();
foreach($algos as $algo)
{
$time=microtime(1);
$data = hash($algo, $word, false);
$results["".(microtime(1)-$time)][] = "$algo (hex)";
}
foreach($algos as $algo)
{
$time=microtime(1);
$data = hash($algo, $word, true);
$results["".(microtime(1)-$time)][] = "$algo (raw)";
}
ksort($results);
foreach($results as $time => &$algos) {
echo $time."\n";
sort($algos);
foreach($algos as $algo)
echo "\t".$algo."\n";
}
}
testAlgos();
?>
Errata
26-Dec-2007 09:54
26-Dec-2007 09:54
The above won't work in raw output, besides the crc32 function isn't the same.
if(!function_exists('hash')) {
function hash($algo, $data, $raw_output = 0)
{
if($algo == 'md5') return(md5($data, $raw_output));
if($algo == 'sha1') return(sha1($data, $raw_output));
}
}
mysteryboy
03-Aug-2007 07:33
03-Aug-2007 07:33
but hash a big file ,
example:23KB:
hash
1.2369749546051: md4
1.5122809410095: md5
7.1646420955658: adler32
3.1666488647461: crc32
0.018635988235474: crc32b
2.4434490203857: sha1
=========>>
1.5402789115906: md5
2.4519650936127: sha1
dani88elx at gmail dot com
26-Jun-2007 08:06
26-Jun-2007 08:06
Comparison between hash algorithms.
<?
$algos = hash_algos();
$word="hola";
foreach($algos as $algo)
{
echo $algo.": ";
$time=microtime(1);
echo hash($algo, $word);
echo "<br>".(microtime(1)-$time)."<br><hr>";
}
?>
just me
10-Apr-2007 03:02
10-Apr-2007 03:02
The speed difference (as noted in a below posting) between md5() and hash() goes down to zero with strings longer than just a few bytes. With a string length of 1kB the difference is 10% advantage for hash() and shrinks further down to 3% with 10kB strings.
mikael at webhost3 dot eu
10-Mar-2007 05:34
10-Mar-2007 05:34
<?php
$time=microtime(1);
for ($i=0;$i<100000;$i++)
hash('md5', 'string');
echo microtime(1)-$time,': hash/md5<br>';
$time=microtime(1);
for ($i=0;$i<100000;$i++)
md5('string');
echo microtime(1)-$time,': md5<br>';
$time=microtime(1);
for ($i=0;$i<100000;$i++)
hash('sha1', 'string');
echo microtime(1)-$time,': hash/sha1<br>';
$time=microtime(1);
for ($i=0;$i<100000;$i++)
sha1('string');
echo microtime(1)-$time,': sha1<br>';
?>------------------------<br><?php
$time=microtime(1);
for ($i=0;$i<100000;$i++)
hash('md5', $i);
echo microtime(1)-$time,': hash/md5<br>';
$time=microtime(1);
for ($i=0;$i<100000;$i++)
md5($i);
echo microtime(1)-$time,': md5<br>';
$time=microtime(1);
for ($i=0;$i<100000;$i++)
hash('sha1', $i);
echo microtime(1)-$time,': hash/sha1<br>';
$time=microtime(1);
for ($i=0;$i<100000;$i++)
sha1($i);
echo microtime(1)-$time,': sha1<br>';
?>
Gives:
0.33311605453491: hash/md5
1.0671429634094: md5
0.383131980896: hash/sha1
1.3252220153809: sha1
------------------------
0.37684988975525: hash/md5
1.1258299350739: md5
0.43960785865784: hash/sha1
1.3876020908356: sha1
Peter Kelly
29-Jan-2007 04:32
29-Jan-2007 04:32
If the hash functions are not available to you at the moment, and you want to future proof your code, then the code below will emulate two of the important hashing functions, they will also be automatically replaced with the faster versions if available.
if(!function_exists('hash_algos'))
{
function hash_algos()
{
$algo[0] = "md5";
$algo[1] = "sha1";
$algo[2] = "crc32";
return($algo);
}
}
if(!function_exists('hash'))
{
function hash($algo, $data, $raw_output = 0)
{
if($algo == 'md5') return(md5($data));
if($algo == 'sha1') return(sha1($data));
if($algo == 'crc32') return(crc32($data));
}
}