APR1

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APR-1 est une fonction de hashage utilisé par les serveurs Apache pour chiffrer les mots de passe .htaccess. Il se sert de MD5 comme base.

Le résultat est structuré comme suit : 

$apr1$__SALT__$_________HASH_________

Le sel fait 8 caractères et le hash 22.

Algorithme

Code PHP
function apr1_salt()
{
	$saltern = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/.';
	$salt = '';
	for ($i=0; $i<8; $i++)
	{
		$salt .= $saltern[rand(0, 64)];
	}
	return $salt;
}

function apr1($mdp, $salt)
{
	$max = strlen($mdp);
	$context = $mdp.'$apr1$'.$salt;
	$binary = pack('H32', md5($mdp.$salt.$mdp));
	for ($i=$max; $i>0; $i-=16)
	{
		$context .= substr($binary, 0, min(16, $i));
	}
	for ($i=$max; $i>0; $i>>=1)
	{
		$context .= ($i & 1) ? chr(0) : $mdp{0};
	}
	$binary = pack('H32', md5($context));
	for ($i=0; $i<1000; $i++)
	{
		$new = ($i & 1) ? $mdp : $binary;
		if ($i % 3)
		{
			$new .= $salt;
		}
		if ($i % 7)
		{
			$new .= $mdp;
		}
		$new .= ($i & 1) ? $binary : $mdp;
		$binary = pack('H32', md5($new));
	}
	$hash = '';
	for ($i = 0; $i < 5; $i++)
	{
		$k = $i+6;
		$j = $i+12;
		if($j == 16) $j = 5;
		$hash = $binary{$i}.$binary{$k}.$binary{$j}.$hash;
	}
	$hash = chr(0).chr(0).$binary{11}.$hash;
	$hash = strtr(
		strrev(substr(base64_encode($hash), 2)),
		'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/',
		'./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'
	);
	return '$apr1$'.$salt.'$'.$hash;
}
 
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Algorithmes
Cryptanalyse
Architecture

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