php对称加密算法(DES/AES)类功能实例

前端之家收集整理的这篇文章主要介绍了php对称加密算法(DES/AES)类功能实例前端之家小编觉得挺不错的,现在分享给大家,也给大家做个参考。
PHP对称加密算法(DES/AES)类代码感兴趣的小伙伴,下面一起跟随编程之家 jb51.cc的小编两巴掌来看看吧!

/**
 * PHP对称加密算法(DES/AES)类代码
 *
 * @param 
 * @arrange 512-笔记网: www.www.jb51.cc
 **/
/** 
 * 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) 
 */  
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,$this->mode);    
		}  
		switch ($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,$this->iv);    
			} else {  
				@$ret = mcrypt_decrypt($this->mcrypt,$this->mode);    
			}  
			if ($this->mcrypt == MCRYPT_DES) $ret = $this->_pkcs5Unpad($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,-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;  
	}  
} 
/***   来自编程之家 jb51.cc(jb51.cc)   ***/
给个小demo吧

/**
 * PHP对称加密算法(DES/AES)类代码
 *
 * @param 
 * @arrange 512-笔记网: www.www.jb51.cc
 **/
<?PHP  
header('Content-Type:text/html;Charset=utf-8;');  
include "xcrypt.PHP";  
echo '<pre>';  
//////////////////////////////////////  
$a = isset($_GET['a']) ? $_GET['a'] : '测试123';  
//密钥  
$key = '12345678123456781234567812345678'; //256 bit  
$key = '1234567812345678'; //128 bit  
$key = '12345678'; //64 bit  
//设置模式和IV  
$m = new Xcrypt($key,'cbc','auto');  
//获取向量值  
echo '向量:';  
var_dump($m->getIV());  
//加密  
$b = $m->encrypt($a,'base64');  
//解密  
$c = $m->decrypt($b,'base64');  
echo '加密后:';  
var_dump($b);  
echo '解密后:';  
var_dump($c);  
/////////////////////////////////////////  
echo '</pre>';  
/***   来自编程之家 jb51.cc(jb51.cc)   ***/
原文链接:https://www.f2er.com/php/528510.html

猜你在找的PHP相关文章