wordpress密码生成与登录密码验证

一。研究wordpress时wordpess的密码密码生成与登录密码验证方式很重要

WordPress密码已成为整合的首要目标，如何征服整合，就得了解WordPress密码算法。

WordPress系统的用户密码是保存在wp_users数据表的user_pass字段，密码是通过Portable PHP password hashing framework类产生的，密码的形式是随机且不可逆，同一个明文的密码在不同时间，产生的密文也不一样，相对来说较为安全。

二。密码生成方式

> 随机产生一个salt 并将salt和password相加
> 进行了count次md5 然后和encode64的hash数值累加
> 最后得到一个以$P$开头的密码，这个密码每次产生的结果都不一样

以下为在wordpress中调用密码生成的代码

<?php $password = 'abc'; global $wp_hasher; if ( empty($wp_hasher) ) {  require_once( './wp-includes/class-phpass.php');  $wp_hasher = new PasswordHash(8, TRUE); } echo $wp_hasher->HashPassword($password);?>

三。wordpress密码生成与登录验证

wordpress中位置为\wp-includes\class-phpass.php

以下是wordpress中生成密码的代码直接运行可查看密码的生成以及验证过程

<?phpclass PasswordHash {var $itoa64;var $iteration_count_log2;var $portable_hashes;var $random_state;function PasswordHash($iteration_count_log2, $portable_hashes){$this->itoa64 = './0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';if ($iteration_count_log2 < 4 || $iteration_count_log2 > 31)$iteration_count_log2 = 8;$this->iteration_count_log2 = $iteration_count_log2;$this->portable_hashes = $portable_hashes;$this->random_state = microtime() . uniqid(rand(), TRUE); // removed getmypid() for compability reasons}function get_random_bytes($count){$output = '';if ( @is_readable('/dev/urandom') &&    ($fh = @fopen('/dev/urandom', 'rb'))) {$output = fread($fh, $count);fclose($fh);}if (strlen($output) < $count) {$output = '';for ($i = 0; $i < $count; $i += 16) {$this->random_state =    md5(microtime() . $this->random_state);$output .=    pack('H*', md5($this->random_state));}$output = substr($output, 0, $count);}return $output;}function encode64($input, $count){$output = '';$i = 0;do {$value = ord($input[$i++]);$output .= $this->itoa64[$value & 0x3f];if ($i < $count)$value |= ord($input[$i]) << 8;$output .= $this->itoa64[($value >> 6) & 0x3f];if ($i++ >= $count)break;if ($i < $count)$value |= ord($input[$i]) << 16;$output .= $this->itoa64[($value >> 12) & 0x3f];if ($i++ >= $count)break;$output .= $this->itoa64[($value >> 18) & 0x3f];} while ($i < $count);return $output;}function gensalt_private($input){$output = '$PXXXXX;$output .= $this->itoa64[min($this->iteration_count_log2 +((PHP_VERSION >= '5') ? 5 : 3), 30)];$output .= $this->encode64($input, 6);return $output;}function crypt_private($password, $setting){$output = '*0';if (substr($setting, 0, 2) == $output)$output = '*1';$id = substr($setting, 0, 3);# We use "$P{1}quot;, phpBB3 uses "$H{1}quot; for the same thingif ($id != '$PXXXXX && $id != '$HXXXXX)return $output;$count_log2 = strpos($this->itoa64, $setting[3]);if ($count_log2 < 7 || $count_log2 > 30)return $output;$count = 1 << $count_log2;$salt = substr($setting, 4, 8);if (strlen($salt) != 8)return $output;# We're kind of forced to use MD5 here since it's the only# cryptographic primitive available in all versions of PHP# currently in use.  To implement our own low-level crypto# in PHP would result in much worse performance and# consequently in lower iteration counts and hashes that are# quicker to crack (by non-PHP code).if (PHP_VERSION >= '5') {$hash = md5($salt . $password, TRUE);do {$hash = md5($hash . $password, TRUE);} while (--$count);} else {$hash = pack('H*', md5($salt . $password));do {$hash = pack('H*', md5($hash . $password));} while (--$count);}$output = substr($setting, 0, 12);$output .= $this->encode64($hash, 16);return $output;}function gensalt_extended($input){$count_log2 = min($this->iteration_count_log2 + 8, 24);# This should be odd to not reveal weak DES keys, and the# maximum valid value is (2**24 - 1) which is odd anyway.$count = (1 << $count_log2) - 1;$output = '_';$output .= $this->itoa64[$count & 0x3f];$output .= $this->itoa64[($count >> 6) & 0x3f];$output .= $this->itoa64[($count >> 12) & 0x3f];$output .= $this->itoa64[($count >> 18) & 0x3f];$output .= $this->encode64($input, 3);return $output;}function gensalt_blowfish($input){# This one needs to use a different order of characters and a# different encoding scheme from the one in encode64() above.# We care because the last character in our encoded string will# only represent 2 bits.  While two known implementations of# bcrypt will happily accept and correct a salt string which# has the 4 unused bits set to non-zero, we do not want to take# chances and we also do not want to waste an additional byte# of entropy.$itoa64 = './ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';$output = '$2aXXXXX;$output .= chr(ord('0') + $this->iteration_count_log2 / 10);$output .= chr(ord('0') + $this->iteration_count_log2 % 10);$output .= 'XXXXX;$i = 0;do {$c1 = ord($input[$i++]);$output .= $itoa64[$c1 >> 2];$c1 = ($c1 & 0x03) << 4;if ($i >= 16) {$output .= $itoa64[$c1];break;}$c2 = ord($input[$i++]);$c1 |= $c2 >> 4;$output .= $itoa64[$c1];$c1 = ($c2 & 0x0f) << 2;$c2 = ord($input[$i++]);$c1 |= $c2 >> 6;$output .= $itoa64[$c1];$output .= $itoa64[$c2 & 0x3f];} while (1);return $output;}function HashPassword($password){$random = '';if (CRYPT_BLOWFISH == 1 && !$this->portable_hashes) {$random = $this->get_random_bytes(16);$hash =    crypt($password, $this->gensalt_blowfish($random));if (strlen($hash) == 60)return $hash;}if (CRYPT_EXT_DES == 1 && !$this->portable_hashes) {if (strlen($random) < 3)$random = $this->get_random_bytes(3);$hash =    crypt($password, $this->gensalt_extended($random));if (strlen($hash) == 20)return $hash;}if (strlen($random) < 6)$random = $this->get_random_bytes(6);$hash =    $this->crypt_private($password,    $this->gensalt_private($random));if (strlen($hash) == 34)return $hash;# Returning '*' on error is safe here, but would _not_ be safe# in a crypt(3)-like function used _both_ for generating new# hashes and for validating passwords against existing hashes.return '*';}function CheckPassword($password, $stored_hash){$hash = $this->crypt_private($password, $stored_hash);if ($hash[0] == '*')$hash = crypt($password, $stored_hash);return $hash == $stored_hash;}}//原始密码$passwordValue = "123456";//生成密码$wp_hasher = new PasswordHash(8, TRUE);$sigPassword = $wp_hasher->HashPassword($passwordValue);echo "生成的密码为:".$sigPassword;echo "\n";//验证密码$data = $wp_hasher->CheckPassword($passwordValue,$sigPassword);if($data){    echo '密码正确';}else{echo '密码错误';}?>

此为一个wordpres密码生成与登录验证实例，其中HashPassword为生成密码，CheckPassword为验证密码

itoa64 = './0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'; 为以上提到的生成salt的基础字符串。 

备注：由于csdn代码显示插件对特殊字符的限制。 请将以上代码中 XXXXX替换为 $'  注意有单引号，代码中一共有5处

原博客链接：http://blog.csdn.net/chengfei112233/article/details/6939144/