php中加密解密DES的使用

在平时的开发工作中，我们经常会对关键字符进行加密，可能为了安全 也可能为了规范，所以要正确使用DES加密解密

1. 代码1:

class DES
{

    var $key; // **

    var $iv; // 偏移量



    function __construct( $key, $iv=0 ) {

        $this->key = $key;

        if( $iv == 0 ) {

            $this->iv = $key;

        } else {

            $this->iv = $iv; 
            // 创建初始向量, 并且检测**长度, Windows 平台请使用 MCRYPT_RAND
            // mcrypt_create_iv ( mcrypt_get_block_size (MCRYPT_DES, MCRYPT_MODE_CBC), MCRYPT_DEV_RANDOM );

        }

    }



    function encrypt($str) {

        //加密，返回大写十六进制字符串
        $size = mcrypt_get_block_size ( MCRYPT_DES, MCRYPT_MODE_CBC );

        $str = $this->pkcs5Pad ( $str, $size );
		// bin2hex 把 ASCII 字符的字符串转换为十六进制值
        return strtoupper( bin2hex( mcrypt_cbc(MCRYPT_DES, $this->key, $str, MCRYPT_ENCRYPT, $this->iv ) ) );

    }



    function decrypt($str) {

        //解密

        $strBin = $this->hex2bin( strtolower( $str ) );

        $str = mcrypt_cbc( MCRYPT_DES, $this->key, $strBin, MCRYPT_DECRYPT, $this->iv );

        $str = $this->pkcs5Unpad( $str );

        return $str;

    }



    function hex2bin($hexData) {

        $binData = "";

        for($i = 0; $i < strlen ( $hexData ); $i += 2) {

            $binData .= chr ( hexdec ( substr ( $hexData, $i, 2 ) ) );

        }

        return $binData;

    }



    function pkcs5Pad($text, $blocksize) {

        $pad = $blocksize - (strlen ( $text ) % $blocksize);

        return $text . str_repeat ( chr ( $pad ), $pad );

    }



    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;

        return substr ( $text, 0, - 1 * $pad );

    }

}

Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP; DES5 has a deprecated constructor in D:\phpstudy_pro\WWW\des\DES5.php on line 2

Fatal error: Uncaught Error: Call to undefined function mcrypt_get_block_size() in D:\phpstudy_pro\WWW\des\DES5.php:19 Stack trace: #0 D:\phpstudy_pro\WWW\des\1.php(10): DES5->encrypt('podsmia') #1 {main} thrown in D:\phpstudy_pro\WWW\des\DES5.php on line 19

mcrypt_cbc 以 CBC 模式加解密数据, 在PHP 5.5.0+被弃用, PHP 7.0.0被移除
mcrypt_encrypt / mcrypt_decrypt 使用给定参数加密 / 解密, 在PHP 7.1.0+被弃用, 在PHP 7.2.0+被移除

2. 代码2:

class DES7
{

    //要改的加密, 使用 openssl

    public function desEncrypt($str,$key) {

        $iv = $key;

        $data = openssl_encrypt($str,"DES-CBC",$key,OPENSSL_RAW_DATA,$iv);

        $data = strtolower(bin2hex($data));

        return $data;

    }

  

    //要改的解密

    public function desDecrypt($str,$key) {

        $iv = $key;

        return openssl_decrypt (hex2bin($str), 'DES-CBC', $key, OPENSSL_RAW_DATA,$iv);

    }

}