- /**
- * 常用对称加密算法类
- * 支持密钥: 64/128/256 bit(字节长度 8/16/32)
- * 支持算法: DES/AES(根据密钥长度自动匹配使用: DES:64bit AES:128/256bit)
- * 支持模式: CBC/ECB/OFB/CFB
- * 密文编码: base64 字符串 / 十六进制字符串 / 二进制字符串流
- * 填充方式: PKCS5Padding(DES)
- *
- * @author: linvo
- * @version: 1.0.0
- * @date: 2013/1/10
- */
- class Xcrypt {
- private $mcrypt;
- private $key;
- private $mode;
- private $iv;
- private $blocksize;
- /**
- * 构造函数
- *
- * @param string 密钥
- * @param string 模式
- * @param string 向量 ("off": 不使用 / "auto": 自动 / 其他: 指定值, 长度同密钥)
- */
- public
- function __construct($key, $mode = 'cbc', $iv = "off") {
- switch (strlen($key)) {
- case 8:
- $this - >mcrypt = MCRYPT_DES;
- break;
- case 16:
- $this - >mcrypt = MCRYPT_RIJNDAEL_128;
- break;
- case 32:
- $this - >mcrypt = MCRYPT_RIJNDAEL_256;
- break;
- default:
- die("Key size must be 8/16/32");
- }
- $this - >key = $key;
- switch (strtolower($mode)) {
- case 'ofb':
- $this - >mode = MCRYPT_MODE_OFB;
- if ($iv == 'off') die('OFB must give a IV'); //OFB 必须有向量
- break;
- case 'cfb':
- $this - >mode = MCRYPT_MODE_CFB;
- if ($iv == 'off') die('CFB must give a IV'); //CFB 必须有向量
- break;
- case 'ecb':
- $this - >mode = MCRYPT_MODE_ECB;
- $iv = 'off'; //ECB 不需要向量
- break;
- case 'cbc':
- default:
- $this - >mode = MCRYPT_MODE_CBC;
- }
- switch (strtolower($iv)) {
- case "off":
- $this - >iv = null;
- break;
- case "auto":
- $source = PHP_OS == 'WINNT' ? MCRYPT_RAND: MCRYPT_DEV_RANDOM;
- $this - >iv = mcrypt_create_iv(mcrypt_get_block_size($this - >mcrypt, $this - >mode), $source);
- break;
- default:
- $this - >iv = $iv;
- }
- }
- /**
- * 获取向量值
- * @param string 向量值编码 (base64/hex/bin)
- * @return string 向量值
- */
- public
- function getIV($code = 'base64') {
- switch ($code) {
- case 'base64':
- $ret = base64_encode($this - >iv);
- break;
- case 'hex':
- $ret = bin2hex($this - >iv);
- break;
- case 'bin':
- default:
- $ret = $this - >iv;
- }
- return $ret;
- }
- /**
- * 加密
- * @param string 明文
- * @param string 密文编码 (base64/hex/bin)
- * @return string 密文
- */
- public
- function encrypt($str, $code = 'base64') {
- if ($this - >mcrypt == MCRYPT_DES) $str = $this - >_pkcs5Pad($str);
- if (isset($this - >iv)) {
- $result = mcrypt_encrypt($this - >mcrypt, $this - >key, $str, $this - >mode, $this - >iv);
- } else {@$result = mcrypt_encrypt($this - >mcrypt, $this - >key, $str, $this - >mode);
- }
- switch ($code) {
- case 'base64':
- $ret = base64_encode($result);
- break;
- case 'hex':
- $ret = bin2hex($result);
- break;
- case 'bin':
- default:
- $ret = $result;
- }
- return $ret;
- }
- /**
- * 解密
- * @param string 密文
- * @param string 密文编码 (base64/hex/bin)
- * @return string 明文
- */
- public
- function decrypt($str, $code = "base64") {
- $ret = false;
- switch ($code) {
- case 'base64':
- $str = base64_decode($str);
- break;
- case 'hex':
- $str = $this - >_hex2bin($str);
- break;
- case 'bin':
- default:
- }
- if ($str !== false) {
- if (isset($this - >iv)) {
- $ret = mcrypt_decrypt($this - >mcrypt, $this - >key, $str, $this - >mode, $this - >iv);
- } else {@$ret = mcrypt_decrypt($this - >mcrypt, $this - >key, $str, $this - >mode);
- }
- if ($this - >mcrypt == MCRYPT_DES) $ret = $this - >_pkcs5Unpad($ret);
- $ret = trim($ret);
- }
- return $ret;
- }
- private
- function _pkcs5Pad($text) {
- $this - >blocksize = mcrypt_get_block_size($this - >mcrypt, $this - >mode);
- $pad = $this - >blocksize - (strlen($text) % $this - >blocksize);
- return $text.str_repeat(chr($pad), $pad);
- }
- private
- function _pkcs5Unpad($text) {
- $pad = ord($text {
- strlen($text) - 1
- });
- if ($pad > strlen($text)) return false;
- if (strspn($text, chr($pad), strlen($text) - $pad) != $pad) return false;
- $ret = substr($text, 0, -1 * $pad);
- return $ret;
- }
- private
- function _hex2bin($hex = false) {
- $ret = $hex !== false && preg_match('/^[0-9a-fA-F]+$/i', $hex) ? pack("H*", $hex) : false;
- return $ret;
- }
- }
来源: https://www.php1.cn/detail/php-97e63d9e67.html