<?php
function raw2hex($rawBinaryChars)
{
return = array_pop(unpack('H*', $rawBinaryChars));
}
?>
The complement of hey2raw.
You can use to convert from raw md5-format to human-readable format.
This can be usefull to check "Content-Md5" HTTP-Header.
<?php
$rawMd5 = base64_decode($_SERVER['HTTP_CONTENT_MD5']);
$post_data = file_get_contents("php://input");
if(raw2hex($rawMd5) == md5($post_data)) // Post-Data is okay
else // Post-Data is currupted
?>
md5
(PHP 4, PHP 5, PHP 7)
md5 — Errechnet den MD5-Hash eines Strings
Beschreibung
string md5
( string
$str
[, bool $raw_output = false
] )
Berechnet den MD5-Hash von str unter Verwendung
des » RSA Data Security, Inc. MD5
Message-Digest Algorithm und gibt das Ergebnis zurück.
Parameter-Liste
-
str -
Die Zeichenkette.
-
raw_output -
Wurde der optionale Parameter
raw_outputmitTRUEangegeben, wird der MD5-Wert im Raw Binary Format mit einer Länge von 16 Zeichen zurückgegeben.
Rückgabewerte
Gibt den Hash als 32 Zeichen lange Hexadezimalzahl zurück.
Beispiele
Beispiel #1 Ein md5()-Beispiel
<?php
$str = 'apple';
if (md5($str) === '1f3870be274f6c49b3e31a0c6728957f') {
echo "Haetten Sie lieber einen gruenen oder einen roten Apfel?";
}
?>
Anmerkungen
Hinweis: Sicheres Passwort Hashing
Es wird nicht empfohlen diese Funktion zu verwenden, um Passwörter zu sichern, da dieser Algorithmus sehr schnell ist. Siehe hier für weitere Informationen.
Siehe auch
- md5_file() - Berechnet den MD5-Code einer Datei
- sha1_file() - Berechnet den SHA1-Hash einer Datei
- crc32() - Berechnet den polynomischen CRC32-Wert eines Strings
- sha1() - Berechnet den SHA1-Hash eines Strings
- hash() - Berechnet den Hash einer Nachricht
- crypt() - Einweg-String-Hashing
- password_hash() - Erstellt einen Passwort-Hash
add a note
User Contributed Notes 12 notes
radon8472 at radon-software dot net ¶
1 year ago
Some ONE ¶
1 month ago
speed of hash('md5',) VS md5()
2017-07-14, on a i7-3540M CPU @ 3.00GHz, md5() is slightly quicker than hash('md5',)
This code takes 2.29 seconds
<?php
for($i=0;$i<10000000;++$i) md5("$i");
?>
while this one takes 2.77 seconds
<?php
for($i=0;$i<10000000;++$i) hash('md5',"$i");
?>
But in average, less than half a second for 10 000 000 repetitions is a very minimal advantage.
Shane Allen ¶
14 years ago
From the documentation on Digest::MD5:
md5($data,...)
This function will concatenate all arguments, calculate the MD5 digest of this "message", and return it in binary form.
md5_hex($data,...)
Same as md5(), but will return the digest in hexadecimal form.
PHP's function returns the digest in hexadecimal form, so my guess is that you're using md5() instead of md5_hex(). I have verified that md5_hex() generates the same string as PHP's md5() function.
(original comment snipped in various places)
>Hexidecimal hashes generated with Perl's Digest::MD5 module WILL
>NOT equal hashes generated with php's md5() function if the input
>text contains any non-alphanumeric characters.
>
>$phphash = md5('pa$$');
>echo "php original hash from text: $phphash";
>echo "md5 hash from perl: " . $myrow['password'];
>
>outputs:
>
>php original hash from text: 0aed5d740d7fab4201e885019a36eace
>hash from perl: c18c9c57cb3658a50de06491a70b75cd
sebastian dot haller at freesurf dot ch ¶
10 years ago
It has been found, that hash('md5', 'string'); is faster than md5($string):
http://www.php.net/manual/en/function.hash.php
terry _at_ scribendi_com ¶
12 years ago
Do not use the hex strings returned by md5() as a key for MCrypt 256-bit encryption. Hex characters only represent four bits each, so when you take 32 hex characters, you are only really using a 128-bit key, not a 256-bit one.
Using an alphanumeric key generator [A-Za-z0-9] will also only provide a 192-bit key in 32 characters.
Two different MD5s concatenated in raw binary form, or mcrypt_create_iv(32,MCRYPT_DEV_RANDOM) will give you a true 256-bit key string.
dionyziz at deviantart dot com ¶
10 years ago
Sometimes it's useful to get the actual, binary, md5 digest.
You can use this function for it:
<?php
function md5bin( $target ) {
$md5 = md5( $target );
$ret = '';
for ( $i = 0; $i < 32; $i += 2 ) {
$ret .= chr( hexdec( $md5{ $i + 1 } ) + hexdec( $md5{ $i } ) * 16 );
}
return $ret;
}
?>
admin at gadelkareem dot com ¶
9 years ago
MySQL MD() will not give you the same hash if character set is different.
ex :
<?php
#suppose table_name CHARSET=UTF8
#$md5 = md5('Städte'); # will give you a different hash than MySQL MD5()
#instead use
$md5 = md5(utf8_encode('Städte'));
$r = mysql_query("SELECT *, MD5(`word`) FROM `table_name` WHERE MD5(`word`) LIKE '{$md5}'");
if($r)
while( $row= mysql_fetch_assoc($r) )
print_r($row);
?>
John ¶
7 years ago
If you want to hash a large amount of data you can use the hash_init/hash_update/hash_final functions.
This allows you to hash chunks/parts/incremental or whatever you like to call it.
programings at abv dot bg ¶
4 years ago
This recursive function allow you to hash something in depth using md5().
<?php
function checksum($what, $depth = 1) {
$depth--;
if (!$depth)
return md5($what);
else
return md5(checksum($what, $depth));
}
?>
The function hashed the previous hash to md5() again and again for number of times and returns the last received hash.
Example usage:
<?php
for ($i = 1; $i <= 10; $i++) {
echo "$i. ".checksum("test", $i)."<br />";
}
?>
It can be used for security purposes.
John S. ¶
12 years ago
If you want to replicate CPAN Digest::MD5's function md5_base64 in PHP, use this code:
<?php
function md5_base64 ( $data )
{
return preg_replace('/=+$/','',base64_encode(pack('H*',md5($data))));
}
?>
marzetti dot marco at NOSPAM dot gmail dot com ¶
11 years ago
The complement of raw2hex
<?php
function hex2raw( $str ){
$chunks = str_split($str, 2);
for( $i = 0; $i < sizeof($chunks); $i++ ) {
$op .= chr( hexdec( $chunks[$i] ) );
}
return $op;
}
?>
