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<?php |
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namespace Oakhope\OAuth2\Client\Support\MiniProgram; |
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use Oakhope\OAuth2\Client\Support\Common\AESEncoder; |
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/** |
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* Class PKCS7Encoder |
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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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* @package Oakhope\OAuth2\Client\SDK\MiniProgram |
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*/ |
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class PKCS7Encoder |
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{ |
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const BLOCK_SIZE = 16; |
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/** |
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* 对密文进行解密 |
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* @param string $encrypted 需要解密的密文 |
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* @param string $key |
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* @param string $iv 解密的初始向量 |
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* @return array 解密得到的明文 |
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*/ |
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public function decrypt($encrypted, $key, $iv) |
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{ |
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$decrypted = AESEncoder::decrypt( |
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base64_decode($encrypted, true), |
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base64_decode($key, true), |
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base64_decode($iv, true), |
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OPENSSL_NO_PADDING |
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); |
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$result = $this->decode($decrypted); |
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return array(0, json_decode($result)); |
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} |
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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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* |
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* @param string $text 需要进行填充补位操作的明文 |
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* @return string 补齐明文字符串 |
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*/ |
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private function encode($text) |
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{ |
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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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* |
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* @param string $text 解密后的明文 |
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* @return bool|string 删除填充补位后的明文 |
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*/ |
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private function decode($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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oakhope /
oauth2-wechat
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