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32 lines
815 B
32 lines
815 B
<?php
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namespace LaneWeChat\Core\Aes;
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class PKCS7Encoder
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{
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public static $block_size = 32;
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function encode($text)
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{
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$block_size = PKCS7Encoder::$block_size;
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$text_length = strlen($text);
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$amount_to_pad = PKCS7Encoder::$block_size - ($text_length % PKCS7Encoder::$block_size);
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if ($amount_to_pad == 0) {
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$amount_to_pad = PKCS7Encoder::block_size;
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}
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$pad_chr = chr($amount_to_pad);
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$tmp = "";
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for ($index = 0; $index < $amount_to_pad; $index++) {
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$tmp .= $pad_chr;
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}
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return $text . $tmp;
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}
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function decode($text)
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{
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$pad = ord(substr($text, -1));
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if ($pad < 1 || $pad > 32) {
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$pad = 0;
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}
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return substr($text, 0, (strlen($text) - $pad));
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}
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} |