Funciones de hash

Tabla de contenidos

hash — Generar un valor hash (resumen de mensaje)
hash_algos — Devuelve una lista con los algoritmos de cifrado soportados
hash_copy — Copia un recurso de contexto de cifrado
hash_equals — Comparación de strings segura contra ataques de temporización
hash_file — Generar un valor hash usando el contenido de un fichero dado
hash_final — Finaliza un contexto incremental y devuelve el resultado cifrado
hash_hkdf — Generate a HKDF key derivation of a supplied key input
hash_hmac — Genera un valor cifrado mediante una clave especificada usando el método HMAC
hash_hmac_algos — Return a list of registered hashing algorithms suitable for hash_hmac
hash_hmac_file — Genera un valor cifrado mediante una clave especificada usando el método HMAC y el contenido de un fichero dado
hash_init — Iniciar un contexto de hashing incremental
hash_pbkdf2 — Genera una derivación de clave PBKDF2 de una contraseña proporcionada
hash_update — Pega más datos en un contexto incremental de cifrado activo
hash_update_file — Inyecta datos en un contexto de cifrado activo desde un fichero
hash_update_stream — Pega datos en un contexto de cifrado activo desde un flujo de datos abierto

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User Contributed Notes 4 notes

down

artem at it-nt dot ru ¶

16 years ago

And some code for LM hash:

<?php
function LMhash($string)
{
    $string = strtoupper(substr($string,0,14));

    $p1 = LMhash_DESencrypt(substr($string, 0, 7));
    $p2 = LMhash_DESencrypt(substr($string, 7, 7));

    return strtoupper($p1.$p2);
}

function LMhash_DESencrypt($string)
{
    $key = array();
    $tmp = array();
    $len = strlen($string);

    for ($i=0; $i<7; ++$i)
        $tmp[] = $i < $len ? ord($string[$i]) : 0;

    $key[] = $tmp[0] & 254;
    $key[] = ($tmp[0] << 7) | ($tmp[1] >> 1);
    $key[] = ($tmp[1] << 6) | ($tmp[2] >> 2);
    $key[] = ($tmp[2] << 5) | ($tmp[3] >> 3);
    $key[] = ($tmp[3] << 4) | ($tmp[4] >> 4);
    $key[] = ($tmp[4] << 3) | ($tmp[5] >> 5);
    $key[] = ($tmp[5] << 2) | ($tmp[6] >> 6);
    $key[] = $tmp[6] << 1;
   
    $is = mcrypt_get_iv_size(MCRYPT_DES, MCRYPT_MODE_ECB);
    $iv = mcrypt_create_iv($is, MCRYPT_RAND);
    $key0 = "";
   
    foreach ($key as $k)
        $key0 .= chr($k);
    $crypt = mcrypt_encrypt(MCRYPT_DES, $key0, "KGS!@#$%", MCRYPT_MODE_ECB, $iv);

    return bin2hex($crypt);
}
?>

Some optimization?

down

CraquePipe ¶

16 years ago

For thoes of you who're looking to generate an NTLM hash (not an LM hash), I found out it's quite simple..

It uses the basic MD4 function, but the password needs to be in Unicode Little Endian encode first (this canbe achieved by the iconv function).

This can be done easily by using the following code:

<?php
function NTLMHash($Input) {
  // Convert the password from UTF8 to UTF16 (little endian)
  $Input=iconv('UTF-8','UTF-16LE',$Input);

  // Encrypt it with the MD4 hash
  $MD4Hash=bin2hex(mhash(MHASH_MD4,$Input));

  // You could use this instead, but mhash works on PHP 4 and 5 or above
  // The hash function only works on 5 or above
  //$MD4Hash=hash('md4',$Input);

  // Make it uppercase, not necessary, but it's common to do so with NTLM hashes
  $NTLMHash=strtoupper($MD4Hash);

  // Return the result
  return($NTLMHash);
}
?>

To produce an LM hash requires a fully-written script containing the algorithm used to make it.

Enjoy,
CraquePipe.

down

-4

kungla at gmail dot com ¶

14 years ago

For Samba ueserPassword you can use:



(I am not very sure aboute the salt part, but it works for me like that)



<?php

function CRYPThash($string, $salt = null)

{

    if (!$salt)

        $salt = rand(10,99);

    

    return "{CRYPT}".crypt($string, $salt);

}

?>



In posted NTLMHash function you can also use:



<?php

// Encrypt it with the MD4 hash

$MD4Hash=hash('md4',$Input);

?>



So you don't need to install mhash libraries

down

-5

ocarter at mirabeau dot nl ¶

14 years ago

Note for FreeBSD with PHP-5. 

This is disabled by default; use the security/php5-hash port:
cd /usr/ports/security/php5-hash ; make install clean
(do not use the security/pecl-hash port as in the past, see the /usr/ports/UPDATING post from 20081211)

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