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- <?php
- /**
- * PKCS7Encoder class
- *
- * 提供基于PKCS7算法的加解密接口.
- */
- class PKCS7Encoder
- {
- public static $block_size = 16;
- /**
- * 对需要加密的明文进行填充补位
- * @param $text 需要进行填充补位操作的明文
- * @return 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 . $tmp;
- }
- /**
- * 对解密后的明文进行补位删除
- * @param decrypted 解密后的明文
- * @return 删除填充补位后的明文
- */
- function decode($text)
- {
- $pad = ord(substr($text, -1));
- if ($pad < 1 || $pad > 32) {
- $pad = 0;
- }
- return substr($text, 0, (strlen($text) - $pad));
- }
- }
- /**
- * Prpcrypt class
- *
- *
- */
- class Prpcrypt
- {
- public $key;
- function __construct( $k )
- {
- $this->key = $k;
- }
- /**
- * 对密文进行解密
- * @param string $aesCipher 需要解密的密文
- * @param string $aesIV 解密的初始向量
- * @return string 解密得到的明文
- */
- public function decrypt( $aesCipher, $aesIV )
- {
- try {
- //解密
- $decrypted = openssl_decrypt($aesCipher, 'aes-128-cbc', $this->key, OPENSSL_RAW_DATA, $aesIV);
- // dump(($aesCipher));
- // dump(($this->key));
- // dump(($aesIV));
- } catch (\Exception $e) {
- return false;
- }
- try {
- //去除补位字符
- $pkc_encoder = new PKCS7Encoder;
- $result = $pkc_encoder->decode($decrypted);
- } catch (\Exception $e) {
- //print $e;
- return false;
- }
- return array(0, $result);
- }
- }
- ?>
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