[PHP] 암호화 복호화

<?php
function Encrypt($str, $secret_key='secret key', $secret_iv='secret iv')
{
    $key = hash('sha256', $secret_key);
    $iv = substr(hash('sha256', $secret_iv), 0, 32)    ;
    return str_replace("=", "", base64_encode(
    	openssl_encrypt($str, "AES-256-CBC", $key, 0, $iv))
    );
}

function Decrypt($str, $secret_key='secret key', $secret_iv='secret iv')
{
    $key = hash('sha256', $secret_key);
    $iv = substr(hash('sha256', $secret_iv), 0, 32);
    return openssl_decrypt(
    	base64_decode($str), "AES-256-CBC", $key, 0, $iv
    );
}

$str = "안녕하세요. 하보니입니다.";
$secret_key = "123456789";
$secret_iv = "#@$%^&*()_+=-";
$encrypted = Encrypt($str, $secret_key, $secret_iv);
echo "암호화 문자열 => " .$encrypted. "<br />\n";
$decrypted = Decrypt($encrypted, $secret_key, $secret_iv);
echo "복호화 문자열 => " .$decrypted. "\n";
/*

    결과:
    암호화 문자열 => VUYxMHFQVWU5TG9KeWMrZlJhZjV3VkFJbTFHV
                     DZERlhNeEpldW1GRVB0WjQyODdkRnFDTFhIa0UrWEEvb1VGbg
    복호화 문자열 => 안녕하세요. 하보니입니다.
*/
?>