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56 lines
1.3 KiB
PHP
Executable File
56 lines
1.3 KiB
PHP
Executable File
<?php
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namespace addons\kefu\library\WechatCrypto;
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use addons\kefu\library\WechatCrypto\ErrorCode;
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/**
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* PKCS7Encoder class
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*
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* 提供基于PKCS7算法的加解密接口.
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*/
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class PKCS7Encoder
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{
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public static $block_size = 32;
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/**
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* 对需要加密的明文进行填充补位
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* @param $text 需要进行填充补位操作的明文
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* @return 补齐明文字符串
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*/
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function encode($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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//计算需要填充的位数
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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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//获得补位所用的字符
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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 . $tmp;
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}
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/**
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* 对解密后的明文进行补位删除
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* @param decrypted 解密后的明文
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* @return 删除填充补位后的明文
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*/
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function decode($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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}
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?>
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