本文实例讲述了PHP实现的DES加密解密类定义与用法。分享给大家供大家参考,具体如下:
今天写App接口的时候需要传递加密数据给APP端,于是就写了下面的DES加密类,亲测正确代码如下
class CryptDes { function __construct(){ $this->key = 'codelovers'; //密钥 $this->iv = '15548632'; //偏移量 } /* * 加密 */ function encrypt($input){ $size = mcrypt_get_block_size(MCRYPT_DES,MCRYPT_MODE_CBC); //3DES加密将MCRYPT_DES改为MCRYPT_3DES $input = $this->pkcs5_pad($input, $size); //如果采用PaddingPKCS7,请更换成PaddingPKCS7方法。 $key = str_pad($this->key,8,'0'); //3DES加密将8改为24 $td = mcrypt_module_open(MCRYPT_DES, '', MCRYPT_MODE_CBC, ''); if( $this->iv == '' ) { $iv = @mcrypt_create_iv (mcrypt_enc_get_iv_size($td), MCRYPT_RAND); } else { $iv = $this->iv; } @mcrypt_generic_init($td, $key, $iv); $data = mcrypt_generic($td, $input); mcrypt_generic_deinit($td); mcrypt_module_close($td); $data = base64_encode($data);//如需转换二进制可改成 bin2hex 转换 return $data; } /* * 解密 */ function decrypt($encrypted){ $encrypted = base64_decode($encrypted); //如需转换二进制可改成 bin2hex 转换 $key = str_pad($this->key,8,'0'); //3DES加密将8改为24 $td = mcrypt_module_open(MCRYPT_DES,'',MCRYPT_MODE_CBC,'');//3DES加密将MCRYPT_DES改为MCRYPT_3DES if( $this->iv == '' ) { $iv = @mcrypt_create_iv (mcrypt_enc_get_iv_size($td), MCRYPT_RAND); } else { $iv = $this->iv; } $ks = mcrypt_enc_get_key_size($td); @mcrypt_generic_init($td, $key, $iv); $decrypted = mdecrypt_generic($td, $encrypted); mcrypt_generic_deinit($td); mcrypt_module_close($td); $y=$this->pkcs5_unpad($decrypted); return $y; } function pkcs5_pad ($text, $blocksize) { $pad = $blocksize - (strlen($text) % $blocksize); return $text . str_repeat(chr($pad), $pad); } function pkcs5_unpad($text){ $pad = ord($text{strlen($text)-1}); if ($pad > strlen($text)) { return false; } if (strspn($text, chr($pad), strlen($text) - $pad) != $pad){ return false; } return substr($text, 0, -1 * $pad); } function PaddingPKCS7($data) { $block_size = mcrypt_get_block_size(MCRYPT_DES, MCRYPT_MODE_CBC);//3DES加密将MCRYPT_DES改为MCRYPT_3DES $padding_char = $block_size - (strlen($data) % $block_size); $data .= str_repeat(chr($padding_char),$padding_char); return $data; } }
用法如下:
$str = 'www.zzvips.com'; $des = new CryptDes(); $mres = $des->encrypt($str); //加密 echo $mres."<br/>"; $jres = $des->decrypt($mres); //解密 echo $jres."<br/>";
运行结果:
TxqbmhK86YWdTtTAQoDOqA==
www.zzvips.com
希望本文所述对大家PHP程序设计有所帮助。