mcrypt如何加/解密?_PHP教程

PHP代码:--------------------------------------------------------------------------------
function make_seed() {
list($usec, $sec) = explode(' ', microtime());
return(float) $sec +((float) $usec * 100000);
}
srand(make_seed());
/* 开启加密算法/ */
$td = mcrypt_module_open('twofish', ', 'ecb', ');
/* 建立 IV，并检测 key 的长度 */
$iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
$ks = mcrypt_enc_get_key_size($td);
/* 生成 key */
$key = substr(md5('very secret key'), 0, $ks);
/* 初始化加密程序 */
mcrypt_generic_init($td, $key, $iv);
/* 加密, $encrypted 保存的是已经加密后的数据 */
print $encrypted = mcrypt_generic($td, 'This is very important data');
/* 检测加密句柄 */
mcrypt_generic_deinit($td);
/* 初始化加密模块，用以解密 */
mcrypt_generic_init($td, $key, $iv);
/* 解密 */
$decrypted = mdecrypt_generic($td, $encrypted);
/* 检测解密句柄，并关闭模块 */
mcrypt_generic_deinit($td);
mcrypt_module_close($td);
/* 显示原始字符串 */
echo trim($decrypted)." ";

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