PHP的des加密+ ECB模式+PKCS5 补齐

q66262

/**
*
* 加密函数
* 算法：des
* 加密模式：ecb
* 补齐方法：PKCS5
*
* @param unknown_type $input
*/
function encryptDesEcbPKCS5($input, $key)
{
$size = mcrypt_get_block_size('des', 'ecb');
$input = pkcs5_pad($input, $size);
$td = mcrypt_module_open('des', '', 'ecb', '');
//$iv = mcrypt_create_iv (mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
$iv = 0;
mcrypt_generic_init($td, $key, $iv);
$data = mdecrypt_generic ($td, $input);
mcrypt_generic_deinit($td);
mcrypt_module_close($td);
//$data = base64_encode($data);
return $data;
}
/**
* 解密函数
* 算法：des
* 加密模式：ecb
* 补齐方法：PKCS5
* @param unknown_type $input
*/
function decryptDesEcbPKCS5($input, $key)
{
$size = mcrypt_get_block_size('des', 'ecb');
$td = mcrypt_module_open('des', '', 'ecb', '');
$iv = 0;
mcrypt_generic_init($td, $key, $iv);
$data = mcrypt_generic($td, $input);
mcrypt_generic_deinit($td);
mcrypt_module_close($td);
$data = pkcs5_unpad($data, $size);
//$data = base64_encode($data);
return $data;
}
function pkcs5_pad ($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);
}
$str = 'test crypt';
$key = 'jack11';
$res = encryptDesEcbPKCS5($str, $key);
echo "$res\n";

$deRes = decryptDesEcbPKCS5($res, $key);
echo "\n$deRes\n";
　　PHP的ＤＥＳ加密的补齐比较特殊，而且不能指定
　　http://www.herongyang.com/Cryptography/DES-PHP-Block-Padding-in-mcrypt.html