/**
* Derive a key of the specified length based on the inputted secret
*
* @param string $secret The secret to base the key on
* @param int $length The length of the key to derive
* @param string $other Additional data to append to the key
*
* @return string The generated key
*/
public function derive($secret, $length, $other = '')
{
$size = Hash::getHashSize($this->hash);
$len = ceil($length / $size);
$res = '';
for ($i = 1; $i <= $len; $i++) {
$tmp = pack('N', $i);
$res .= hash($this->hash, $secret . $tmp . $other, true);
}
return substr($res, 0, $length);
}
/**
* Derive a key of the specified length based on the inputted secret
*
* @param string $secret The secret to base the key on
* @param int $length The length of the key to derive
* @param string $other Additional data to append to the key
*
* @return string The generated key
*/
public function derive($secret, $length, $other = '')
{
$size = Hash::getHashSize($this->hash);
$len = ceil($length / $size);
$res = '';
$stub = str_repeat(chr(0), max($this->options['pAmt'], 0));
for ($i = 0; $i < $len; $i++) {
$tmp = $stub . pack('N', $i);
$res .= hash($this->hash, $tmp . $secret . $other, true);
}
return substr($res, 0, $length);
}
/**
* Derive a key from the supplied arguments
*
* @param string $password The password to derive from
* @param string $salt The salt string to use
* @param int $iterations The number of iterations to use
* @param int $length The size of the string to generate
*
* @return string The derived key
*/
public function derive($password, $salt, $iterations, $length)
{
$size = Hash::getHashSize($this->hash);
if ($length > $size) {
$message = 'Length is too long for hash';
throw new \InvalidArgumentException($message);
}
$tmp = hash($this->hash, $password . $salt, true);
for ($i = 2; $i <= $iterations; $i++) {
$tmp = hash($this->hash, $tmp, true);
}
return substr($tmp, 0, $length);
}
/**
* Generate the MAC using the supplied data
*
* @param string $data The data to use to generate the MAC with
* @param string $key The key to generate the MAC
* @param int $size The size of the output to return
*
* @return string The generated MAC of the appropriate size
*/
public function generate($data, $key, $size = 0)
{
$hash = $this->options['hash'];
$outputSize = Hash::getHashSize($hash);
if ($size == 0) {
$size = $outputSize;
}
if ($size > $outputSize) {
throw new \OutOfRangeException(sprintf('The size is too big for the hash primitive [%d:%d]', $size, $outputSize));
}
$return = hash_hmac($hash, $data, $key, true);
return substr($return, 0, $size);
}
/**
* Derive a key from the supplied arguments
*
* @param string $password The password to derive from
* @param string $salt The salt string to use
* @param int $iterations The number of iterations to use
* @param int $length The size of the string to generate
*
* @return string The derived key
*/
public function derive($password, $salt, $iterations, $length)
{
$size = Hash::getHashSize($this->hash);
$len = ceil($length / $size);
$result = '';
for ($i = 1; $i <= $len; $i++) {
$tmp = hash_hmac($this->hash, $salt . pack('N', $i), $password, true);
$res = $tmp;
for ($j = 1; $j < $iterations; $j++) {
$tmp = hash_hmac($this->hash, $tmp, $password, true);
$res ^= $tmp;
}
$result .= $res;
}
return substr($result, 0, $length);
}
public function testIsSecureDefault()
{
$this->assertEquals(false, Hash::isSecure('foobarbaz'));
}