PHP USES DES to encrypt and decrypt in detail

DES is a standard data encryption algorithm. For detailed introduction of this algorithm, please refer to wiki and Baidu Encyclopedia:

wiki

There is an extension in php that can support DES's encryption algorithm: extension= ES11en_mcrypt.dll

Opening this extension in the configuration file is not yet available in the windows environment

The libmcrypt. dll folder under PHP needs to be copied to the system32 directory of the system. mcrypt can be viewed through phpinfo, indicating that this module can be tried normally.

Here is an example of using DES encryption and decryption in PHP:

//$input - stuff to decrypt
    //$key - the secret key to use
    function do_mencrypt($input, $key)
    {
        $input = str_replace(""n", "", $input);
        $input = str_replace(""t", "", $input);
        $input = str_replace(""r", "", $input);
        $key = substr(md5($key), 0, 24);
        $td = mcrypt_module_open('tripledes', '', 'ecb', '');
        $iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
        mcrypt_generic_init($td, $key, $iv);
        $encrypted_data = mcrypt_generic($td, $input);
        mcrypt_generic_deinit($td);
        mcrypt_module_close($td);
        return trim(chop(base64_encode($encrypted_data)));
    }

    //$input - stuff to decrypt
    //$key - the secret key to use

    function do_mdecrypt($input, $key)
    {
        $input = str_replace(""n", "", $input);
        $input = str_replace(""t", "", $input);
        $input = str_replace(""r", "", $input);
        $input = trim(chop(base64_decode($input)));
        $td = mcrypt_module_open('tripledes', '', 'ecb', '');
        $key = substr(md5($key), 0, 24);
        $iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
        mcrypt_generic_init($td, $key, $iv);
        $decrypted_data = mdecrypt_generic($td, $input);
        mcrypt_generic_deinit($td);
        mcrypt_module_close($td);
        return trim(chop($decrypted_data));
    }