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<?PHP
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/**
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* AES加密、解密类
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* @author hushangming
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* www.jbxue.com
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* 用法：
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* <pre>
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* // 实例化类
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* // 参数$_bit：格式，支持256、192、128，默认为128字节的
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* // 参数$_type：加密/解密方式，支持cfb、cbc、nofb、ofb、stream、ecb，默认为ecb
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* // 参数$_key：密钥，默认为abcdefghijuklmno
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* $tcaes = new TCAES();
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* $string = 'laohu';
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* // 加密
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* $encodeString = $tcaes->encode($string);
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* // 解密
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* $decodeString = $tcaes->decode($encodeString);
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* </pre>
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*/
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class TCAES{
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private $_bit = MCRYPT_RIJNDAEL_256;
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private $_type = MCRYPT_MODE_CBC;
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//private $_key = 'abcdefghijuklmno0123456789012345';
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private $_key = 'abcdefghijuklmno'; // 密钥
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private $_use_base64 = true;
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private $_iv_size = null;
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private $_iv = null;
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/**
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* @param string $_key 密钥
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* @param int $_bit 默认使用128字节
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* @param string $_type 加密解密方式
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* @param boolean $_use_base64 默认使用base64二次加密
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*/
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public function __construct($_key = '', $_bit = 128, $_type = 'ecb', $_use_base64 = true){
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// 加密字节
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if(192 === $_bit){
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$this->_bit = MCRYPT_RIJNDAEL_192;
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}elseif(128 === $_bit){
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$this->_bit = MCRYPT_RIJNDAEL_128;
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}else{
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$this->_bit = MCRYPT_RIJNDAEL_256;
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}
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// 加密方法
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if('cfb' === $_type){
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$this->_type = MCRYPT_MODE_CFB;
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}elseif('cbc' === $_type){
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$this->_type = MCRYPT_MODE_CBC;
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}elseif('nofb' === $_type){
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$this->_type = MCRYPT_MODE_NOFB;
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}elseif('ofb' === $_type){
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$this->_type = MCRYPT_MODE_OFB;
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}elseif('stream' === $_type){
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$this->_type = MCRYPT_MODE_STREAM;
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}else{
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$this->_type = MCRYPT_MODE_ECB;
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}
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// 密钥
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if(!empty($_key)){
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$this->_key = $_key;
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}
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// 是否使用base64
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$this->_use_base64 = $_use_base64;
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$this->_iv_size = mcrypt_get_iv_size($this->_bit, $this->_type);
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$this->_iv = mcrypt_create_iv($this->_iv_size, MCRYPT_RAND);
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}
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/**
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* 加密
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* @param string $string 待加密字符串
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* @return string
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*/
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public function encode($string){
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if(MCRYPT_MODE_ECB === $this->_type){
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$encodeString = mcrypt_encrypt($this->_bit, $this->_key, $string, $this->_type);
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}else{
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$encodeString = mcrypt_encrypt($this->_bit, $this->_key, $string, $this->_type, $this->_iv);
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}
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if($this->_use_base64)
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$encodeString = base64_encode($encodeString);
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return $encodeString;
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}
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/**
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* 解密
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* @param string $string 待解密字符串
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* @return string
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*/
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public function decode($string){
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if($this->_use_base64)
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$string = base64_decode($string);
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$string = $this->toHexString($string);
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if(MCRYPT_MODE_ECB === $this->_type){
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$decodeString = mcrypt_decrypt($this->_bit, $this->_key, $string, $this->_type);
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}else{
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$decodeString = mcrypt_decrypt($this->_bit, $this->_key, $string, $this->_type, $this->_iv);
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}
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return $decodeString;
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}
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/**
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* 将$string转换成十六进制
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* @param string $string
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* @return stream
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*/
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private function toHexString ($string){
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$buf = "";
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for ($i = 0; $i < strlen($string); $i++){
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$val = dechex(ord($string{$i}));
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if(strlen($val)< 2)
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$val = "0".$val;
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$buf .= $val;
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}
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return $buf;
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}
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/**
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* 将十六进制流$string转换成字符串
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* @param stream $string
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* @return string
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*/
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private function fromHexString($string){
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$buf = "";
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for($i = 0; $i < strlen($string); $i += 2){
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$val = chr(hexdec(substr($string, $i, 2)));
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$buf .= $val;
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}
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return $buf;
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}
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}?>
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