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class Des_Crypt
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{
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private $key;
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function __construct($key)
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{
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$this->key = $key;
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}
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function encrypt($string)
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{
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$size = mcrypt_get_block_size('des','ecb');
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$string = mb_convert_encoding($string, 'GBK', 'UTF-8');
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$string = $this->pkcs5_pad($string, $size);
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$key = $this->key;
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$td = mcrypt_module_open('des', '', 'ecb', '');
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$iv = @mcrypt_create_iv (mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
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@mcrypt_generic_init($td, $key, $iv);
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$data = mcrypt_generic($td, $string);
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mcrypt_generic_deinit($td);
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mcrypt_module_close($td);
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$data = base64_encode($data);
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return $data;
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}
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function decrypt($string)
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{
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$string = base64_decode($string);
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$key =$this->key;
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$td = mcrypt_module_open('des','','ecb','');
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//使用MCRYPT_DES算法,cbc模式
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$iv = @mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
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$ks = mcrypt_enc_get_key_size($td);
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@mcrypt_generic_init($td, $key, $iv);
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//初始处理
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$decrypted = mdecrypt_generic($td, $string);
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//解密
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mcrypt_generic_deinit($td);
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//结束
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mcrypt_module_close($td);
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$result = $this->pkcs5_unpad($decrypted);
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$result = mb_convert_encoding($result, 'UTF-8', 'GBK');
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return $result;
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}
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function pkcs5_pad ($text, $blocksize)
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{
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$pad = $blocksize - (strlen($text) % $blocksize);
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return $text . str_repeat(chr($pad), $pad);
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}
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function pkcs5_unpad($text)
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{
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$pad = ord($text{strlen($text)-1});
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if ($pad > strlen($text))
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{
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return false;
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}
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if (strspn($text, chr($pad), strlen($text) - $pad) != $pad)
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{
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return false;
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}
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return substr($text, 0, -1 * $pad);
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}
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}
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/*
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For example:
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$key = "!@#%test";
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$string1 = "13701014606";
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$string2 = "这是中文测试";
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$des = new Des_Crypt($key);
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$encryption = $des->encrypt($string2);
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$decryption = $des->decrypt($encryption);
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echo "原始值：".$decryption;
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echo "<br />";
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echo "加密值：".$encryption;
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*/
