/** * RSA私鑰加密 * @param string $private_key 私鑰 * @param string $data 要加密的字符串 * @return string $encrypted 返回加密后的字符串 * @author mosishu */function privateEncrypt($private_key,$data){ $encrypted = ''; $pi_key = openssl_pkey_get_private($private_key);//這個函數可用來判斷私鑰是否是可用的，可用返回資源id Resource id //最大允許加密長度為117，得分段加密 $plainData = str_split($data, 100);//生成密鑰位數 1024 bit key foreach($plainData as $chunk){  $partialEncrypted = '';  $encryptionOk = openssl_private_encrypt($chunk,$partialEncrypted,$pi_key);//私鑰加密  if($encryptionOk === false){   return false;  }  $encrypted .= $partialEncrypted; }  $encrypted = base64_encode($encrypted);//加密后的內容通常含有特殊字符，需要編碼轉換下，在網絡間通過url傳輸時要注意base64編碼是否是url安全的 return $encrypted;}

/** * RSA公鑰解密(私鑰加密的內容通過公鑰可以解密出來) * @param string $public_key 公鑰 * @param string $data 私鑰加密后的字符串 * @return string $decrypted 返回解密后的字符串 * @author mosishu */function publicDecrypt($public_key,$data){ $decrypted = ''; $pu_key = openssl_pkey_get_public($public_key);//這個函數可用來判斷公鑰是否是可用的 $plainData = str_split(base64_decode($data), 128);//生成密鑰位數 1024 bit key foreach($plainData as $chunk){  $str = '';  $decryptionOk = openssl_public_decrypt($chunk,$str,$pu_key);//公鑰解密  if($decryptionOk === false){   return false;  }  $decrypted .= $str; } return $decrypted;}

//RSA公鑰加密function publicEncrypt($public_key,$data){ $encrypted = ''; $pu_key = openssl_pkey_get_public($public_key); $plainData = str_split($data, 100); foreach($plainData as $chunk){  $partialEncrypted = '';  $encryptionOk = openssl_public_encrypt($chunk,$partialEncrypted,$pu_key);//公鑰加密  if($encryptionOk === false){   return false;  }  $encrypted .= $partialEncrypted; } $encrypted = base64_encode($encrypted); return $encrypted;}

//RSA私鑰解密function privateDecrypt($private_key,$data){ $decrypted = ''; $pi_key = openssl_pkey_get_private($private_key); $plainData = str_split(base64_decode($data), 128);  foreach($plainData as $chunk){  $str = '';  $decryptionOk = openssl_private_decrypt($chunk,$str,$pi_key);//私鑰解密  if($decryptionOk === false){   return false;  }  $decrypted .= $str; } return $decrypted;}