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- <?php
- function encrypt($str, $screct_key)
- {
-
- $screct_key = base64_decode($screct_key);
- $str = trim($str);
- $str = addPKCS7Padding($str);
-
- $iv = str_repeat("\0", 16);
- $encrypt_str = openssl_encrypt($str, 'aes-128-cbc', $screct_key, OPENSSL_NO_PADDING, $iv);
- return base64_encode($encrypt_str);
- }
- function decrypt($str, $screct_key)
- {
-
- $str = base64_decode($str);
- $screct_key = base64_decode($screct_key);
-
- $iv = str_repeat("\0", 16);
- $decrypt_str = openssl_decrypt($str, 'aes-128-cbc', $screct_key, OPENSSL_NO_PADDING, $iv);
- $decrypt_str = stripPKSC7Padding($decrypt_str);
- return $decrypt_str;
- }
- function addPKCS7Padding($source)
- {
- $source = trim($source);
- $block = 16;
- $pad = $block - (strlen($source) % $block);
- if ($pad <= $block) {
- $char = chr($pad);
- $source .= str_repeat($char, $pad);
- }
- return $source;
- }
- function stripPKSC7Padding($source)
- {
- $char = substr($source, -1);
- $num = ord($char);
- if ($num == 62) return $source;
- $source = substr($source, 0, -$num);
- return $source;
- }
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