| public encode ( $text ) : 补齐明文字符串 | ||
| $text | 需要进行填充补位操作的明文 | |
| Результат | 补齐明文字符串 | |
function encode($text)
{
$block_size = PKCS7Encoder::$block_size;
$text_length = strlen($text);
//计算需要填充的位数
$amount_to_pad = PKCS7Encoder::$block_size - $text_length % PKCS7Encoder::$block_size;
if ($amount_to_pad == 0) {
$amount_to_pad = PKCS7Encoder::block_size;
}
//获得补位所用的字符
$pad_chr = chr($amount_to_pad);
$tmp = "";
for ($index = 0; $index < $amount_to_pad; $index++) {
$tmp .= $pad_chr;
}
return $text . $tmp;
}