[쿠키 암호화] Function #2 (MD5 + Hex)

[code php]function encrypt_md5_base64($plain_text, $password="password", $iv_len = 16) { $plain_text .= "\x13"; $n = strlen($plain_text); if ($n % 16) $plain_text .= str_repeat("\0", 16 - ($n % 16)); $i = 0; while ($iv_len-- >0) { $enc_text .= chr(mt_rand() & 0xff); } $iv = substr($password ^ $enc_text, 0, 512); while($i <$n) { $block = substr($plain_text, $i, 16) ^ pack('H*', md5($iv)); $enc_text .= $block; $iv = substr($block . $iv, 0, 512) ^ $password; $i += 16; } return base64_encode($enc_text); } function decrypt_md5_base64($enc_text, $password="password", $iv_len = 16) { $enc_text = base64_decode($enc_text); $n = strlen($enc_text); $i = $iv_len; $plain_text = ''; $iv = substr($password ^ substr($enc_text, 0, $iv_len), 0, 512); while($i <$n) { $block = substr($enc_text, $i, 16); $plain_text .= $block ^ pack('H*', md5($iv)); $iv = substr($block . $iv, 0, 512) ^ $password; $i += 16; } return preg_replace('/\x13\x00*$/', '', $plain_text); } /******************************************/ $name = '홍길동'; $enc_name = encrypt_md5_base64($name); $dec_name = decrypt_md5_base64($enc_name); echo "name = {$name}\n\n"; echo "encode_name = {$enc_name}\n\n"; echo "decode_name = {$dec_name}\n\n";[/code]