mhash()

(PHP 4, PHP 5, PHP 7)

Computes hash

说明

mhash() applies a hash function specified by$hashto the$data.

参数

The hash ID. One of the MHASH_hashname constants.

The user input, as a string.

If specified, the function will return the resulting HMAC instead. HMAC is keyed hashing for message authentication, or simply a message digest that depends on the specified key. Not all algorithms supported in mhash can be used in HMAC mode.

返回值

Returns the resulting hash(also called digest)or HMAC as a string, or FALSE on error.

Want to Create a md5 HMAC, but don't have hmash installed?
Use this:
function hmac ($key, $data)
{
  // RFC 2104 HMAC implementation for php.
  // Creates an md5 HMAC.
  // Eliminates the need to install mhash to compute a HMAC
  // Hacked by Lance Rushing
  $b = 64; // byte length for md5
  if (strlen($key) > $b) {
    $key = pack("H*",md5($key));
  }
  $key = str_pad($key, $b, chr(0x00));
  $ipad = str_pad('', $b, chr(0x36));
  $opad = str_pad('', $b, chr(0x5c));
  $k_ipad = $key ^ $ipad ;
  $k_opad = $key ^ $opad;
  return md5($k_opad . pack("H*",md5($k_ipad . $data)));
}
-----
To test:
Run this on a server _with_ mhash installed:
$key = 'Jefe';
$data = "what do ya want for nothing?";
echo hmac($key, $data);
echo "<br>\n";
echo bin2hex (mhash(MHASH_MD5, $data, $key));
should produce:
750c783e6ab0b503eaa86e310a5db738
750c783e6ab0b503eaa86e310a5db738
Happy hashing.

Here is how to compute a NTLM hash:

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