Android客户端与服务器端通过DES加密认证
转载地址:http://blog.csdn.net/spring21st/article/details/6730283
由于Android应用没有像web开发中的session机制,所以采用PHPSESSID的方式,是没有办法获取客户端登录状态的。
这种情况下,如何在用户登录后,服务器端获取用户登录状态并保持,就必须采用一种“握手”的方式。
每个手机都有自己的IMEI号,那么能不能通过这个标识去做认证呢?
经过试验,答案是可以!
客户端在请求服务器端的时候,请求参数为 IMEI (param 1)及 IMEI&UA (param 2)经过加密的字符串;服务器端对客户端传递的两个参数进行解密,比对两个IMEI值是否相同。如果相同,返回token给客户端,以后每次客户端请求服务器端的时候,都携带该token。这样服务器就可以获取用户登录状态了。
这里,我采用的DES加密的方式,由于PHP和Java的DES加密是有差异的,所以单独进行处理:
import java.security.Key; import java.security.SecureRandom; import java.security.spec.AlgorithmParameterSpec; import javax.crypto.Cipher; import javax.crypto.SecretKeyFactory; import javax.crypto.spec.DESKeySpec; import javax.crypto.spec.IvParameterSpec; import com.sun.org.apache.xml.internal.security.utils.Base64; public class Des2 { public static final String ALGORITHM_DES = "DES/CBC/PKCS5Padding"; /** * DES算法,加密 * * @param data 待加密字符串 * @param key 加密私钥,长度不能够小于8位 * @return 加密后的字节数组,一般结合Base64编码使用 * @throws CryptException 异常 */ public static String encode(String key,String data) throws Exception { return encode(key, data.getBytes()); } /** * DES算法,加密 * * @param data 待加密字符串 * @param key 加密私钥,长度不能够小于8位 * @return 加密后的字节数组,一般结合Base64编码使用 * @throws CryptException 异常 */ public static String encode(String key,byte[] data) throws Exception { try { DESKeySpec dks = new DESKeySpec(key.getBytes()); SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES"); //key的长度不能够小于8位字节 Key secretKey = keyFactory.generateSecret(dks); Cipher cipher = Cipher.getInstance(ALGORITHM_DES); IvParameterSpec iv = new IvParameterSpec("12345678".getBytes()); AlgorithmParameterSpec paramSpec = iv; cipher.init(Cipher.ENCRYPT_MODE, secretKey,paramSpec); byte[] bytes = cipher.doFinal(data); return Base64.encode(bytes); } catch (Exception e) { throw new Exception(e); } } /** * DES算法,解密 * * @param data 待解密字符串 * @param key 解密私钥,长度不能够小于8位 * @return 解密后的字节数组 * @throws Exception 异常 */ public static byte[] decode(String key,byte[] data) throws Exception { try { SecureRandom sr = new SecureRandom(); DESKeySpec dks = new DESKeySpec(key.getBytes()); SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES"); //key的长度不能够小于8位字节 Key secretKey = keyFactory.generateSecret(dks); Cipher cipher = Cipher.getInstance(ALGORITHM_DES); IvParameterSpec iv = new IvParameterSpec("12345678".getBytes()); AlgorithmParameterSpec paramSpec = iv; cipher.init(Cipher.DECRYPT_MODE, secretKey,paramSpec); return cipher.doFinal(data); } catch (Exception e) { throw new Exception(e); } } /** * 获取编码后的值 * @param key * @param data * @return * @throws Exception */ public static String decodeValue(String key,String data) { byte[] datas; String value = null; try { if(System.getProperty("os.name") != null && (System.getProperty("os.name").equalsIgnoreCase("sunos") || System.getProperty("os.name").equalsIgnoreCase("linux"))) { datas = decode(key, Base64.decode(data)); } else { datas = decode(key, Base64.decode(data)); } value = new String(datas); } catch (Exception e) { value = ""; } return value; } /** * test * @param key : 12345678 */ public static void main(String[] args) throws Exception { System.out.println("明:cychai ;密:" + Des2.encode("12345678","cychai")); } }
PHP:
class DES { var $key; var $iv; //偏移量 function DES($key, $iv=0) { $this->key = $key; if($iv == 0) { $this->iv = $key; } else { $this->iv = $iv; } } //加密 function encrypt($str) { $size = mcrypt_get_block_size ( MCRYPT_DES, MCRYPT_MODE_CBC ); $str = $this->pkcs5Pad ( $str, $size ); $data=mcrypt_cbc(MCRYPT_DES, $this->key, $str, MCRYPT_ENCRYPT, $this->iv); //$data=strtoupper(bin2hex($data)); //返回大写十六进制字符串 return base64_encode($data); } //解密 function decrypt($str) { $str = base64_decode ($str); //$strBin = $this->hex2bin( strtolower($str)); $str = mcrypt_cbc(MCRYPT_DES, $this->key, $str, MCRYPT_DECRYPT, $this->iv ); $str = $this->pkcs5Unpad( $str ); return $str; } function hex2bin($hexData) { $binData = ""; for($i = 0; $i < strlen ( $hexData ); $i += 2) { $binData .= chr(hexdec(substr($hexData, $i, 2))); } return $binData; } function pkcs5Pad($text, $blocksize) { $pad = $blocksize - (strlen ( $text ) % $blocksize); return $text . str_repeat ( chr ( $pad ), $pad ); } function pkcs5Unpad($text) { $pad = ord ( $text {strlen ( $text ) - 1} ); if ($pad > strlen ( $text )) return false; if (strspn ( $text, chr ( $pad ), strlen ( $text ) - $pad ) != $pad) return false; return substr ( $text, 0, - 1 * $pad ); } } $str = 'abc'; $key= '12345678'; $crypt = new DES($key); $mstr = $crypt->encrypt($str); $str = $crypt->decrypt($mstr); echo $str.' <=> '.$mstr;