我有一个名为pbkdf2.php的文件。
<?php
/*
* Password hashing with PBKDF2.
* Author: havoc AT defuse.ca
* www: https://defuse.ca/php-pbkdf2.htm
*/
// These constants may be changed without breaking existing hashes.
define("PBKDF2_HASH_ALGORITHM", "sha256");
define("PBKDF2_ITERATIONS", 1000);
define("PBKDF2_SALT_BYTES", 24);
define("PBKDF2_HASH_BYTES", 24);
define("HASH_SECTIONS", 4);
define("HASH_ALGORITHM_INDEX", 0);
define("HASH_ITERATION_INDEX", 1);
define("HASH_SALT_INDEX", 2);
define("HASH_PBKDF2_INDEX", 3);
function create_hash($password)
{
// format: algorithm:iterations:salt:hash
$salt = base64_encode(mcrypt_create_iv(PBKDF2_SALT_BYTES, MCRYPT_DEV_URANDOM));
return PBKDF2_HASH_ALGORITHM . ":" . PBKDF2_ITERATIONS . ":" . $salt . ":" .
base64_encode(pbkdf2(
PBKDF2_HASH_ALGORITHM,
$password,
$salt,
PBKDF2_ITERATIONS,
PBKDF2_HASH_BYTES,
true
));
}
function validate_password($password, $good_hash)
{
$params = explode(":", $good_hash);
if(count($params) < HASH_SECTIONS)
return false;
$pbkdf2 = base64_decode($params[HASH_PBKDF2_INDEX]);
return slow_equals(
$pbkdf2,
pbkdf2(
$params[HASH_ALGORITHM_INDEX],
$password,
$params[HASH_SALT_INDEX],
(int)$params[HASH_ITERATION_INDEX],
strlen($pbkdf2),
true
)
);
}
// Compares two strings $a and $b in length-constant time.
function slow_equals($a, $b)
{
$diff = strlen($a) ^ strlen($b);
for($i = 0; $i < strlen($a) && $i < strlen($b); $i++)
{
$diff |= ord($a[$i]) ^ ord($b[$i]);
}
return $diff === 0;
}
function pbkdf2($algorithm, $password, $salt, $count, $key_length, $raw_output = false)
{
$algorithm = strtolower($algorithm);
if(!in_array($algorithm, hash_algos(), true))
die('PBKDF2 ERROR: Invalid hash algorithm.');
if($count <= 0 || $key_length <= 0)
die('PBKDF2 ERROR: Invalid parameters.');
$hash_length = strlen(hash($algorithm, "", true));
$block_count = ceil($key_length / $hash_length);
$output = "";
for($i = 1; $i <= $block_count; $i++) {
// $i encoded as 4 bytes, big endian.
$last = $salt . pack("N", $i);
// first iteration
$last = $xorsum = hash_hmac($algorithm, $last, $password, true);
// perform the other $count - 1 iterations
for ($j = 1; $j < $count; $j++) {
$xorsum ^= ($last = hash_hmac($algorithm, $last, $password, true));
}
$output .= $xorsum;
}
if($raw_output)
return substr($output, 0, $key_length);
else
return bin2hex(substr($output, 0, $key_length));
}
?>
我是从here
下载的我用它如下:
$password = "mypass";
$salt = "K3HtAz[|U8]Of9@?Ppj";
$hash = pbkdf2("SHA256", $password, $salt, 1, 20);
我读过一些文章,但无法帮我写一篇文章
我需要在用户注册级别生成密码和salt并将它们存储到MySQL中,当用户想要登录时,将其与登录表单中的用户输入匹配。
答案 0 :(得分:0)
应使用此代码生成:
$password = 'my password';
$salt = strtr(base64_encode(openssl_random_pseudo_bytes(18)), '+', '.');
$pwhash = crypt($password, sprintf('$2y$%02d$%s', 13, $salt));
并通过此方法匹配:
$given_password = $_POST['password']; // the submitted password
$db_hash = $row['Password']; // field with the password hash
$given_hash = crypt($given_password, $db_hash);
if (isEqual($given_hash, $db_hash)) {
// user password verified
}
// constant time string compare
function isEqual($str1, $str2)
{
$n1 = strlen($str1);
if (strlen($str2) != $n1) {
return false;
}
for ($i = 0, $diff = 0; $i != $n1; ++$i) {
$diff |= ord($str1[$i]) ^ ord($str2[$i]);
}
return !$diff;
}
作为this教程