移动APP接口安全性设计

移动APP接口是怎么保证安全性的，可以采用https，或者是非对称加密。

接口加密的目的是防止被别人用抓包工具，抓包后篡改数据。

关于加密算法常见的有对称加密（DES）和非对称加密（RSA）

对称加密（DES）：加密和解密用的是同一个密钥

import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;/*** DES加密介绍 DES是一种对称加密算法，所谓对称加密算法即：加密和解密使用相同密钥的算法。DES加密算法出自IBM的研究，*/
public class DES {public DES() {}// 测试public static void main(String args[]) throws Exception {// 待加密内容String str = "irish";// 密码，长度要是8的倍数 密钥随意定String password = "95881221";byte[] encrypt = encrypt(str.getBytes(), password);System.out.println("加密后:" + new String(encrypt));// 解密byte[] decrypt = decrypt(encrypt, password);System.out.println("解密后:" + new String(decrypt));}/*** 加密* * @param datasource byte[]* @param password   String* @return byte[]*/public static byte[] encrypt(byte[] datasource, String password) {try {SecureRandom random = new SecureRandom();DESKeySpec desKey = new DESKeySpec(password.getBytes());// 创建一个密匙工厂，然后用它把DESKeySpec转换成SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");SecretKey securekey = keyFactory.generateSecret(desKey);// Cipher对象实际完成加密操作Cipher cipher = Cipher.getInstance("DES");// 用密匙初始化Cipher对象,ENCRYPT_MODE用于将 Cipher 初始化为加密模式的常量
            cipher.init(Cipher.ENCRYPT_MODE, securekey, random);// 现在，获取数据并加密// 正式执行加密操作return cipher.doFinal(datasource); // 按单部分操作加密或解密数据，或者结束一个多部分操作} catch (Throwable e) {e.printStackTrace();}return null;}/*** 解密* * @param src      byte[]* @param password String* @return byte[]* @throws Exception*/public static byte[] decrypt(byte[] src, String password) throws Exception {// DES算法要求有一个可信任的随机数源SecureRandom random = new SecureRandom();// 创建一个DESKeySpec对象DESKeySpec desKey = new DESKeySpec(password.getBytes());// 创建一个密匙工厂SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");// 返回实现指定转换的// 将DESKeySpec对象转换成SecretKey对象SecretKey securekey = keyFactory.generateSecret(desKey);// Cipher对象实际完成解密操作Cipher cipher = Cipher.getInstance("DES");// 用密匙初始化Cipher对象
        cipher.init(Cipher.DECRYPT_MODE, securekey, random);// 真正开始解密操作return cipher.doFinal(src);}
}

 

非对称加密RSA（RSA是他们的发明人的姓氏开头字母拼在一起组成的）

采用第三方工具生成一对密钥对（公钥和私钥）

加密方式分为两种：

1如果用公钥加密，必须采用私钥解密

2如果用私钥加密，必须采用公钥解密

移动APP接口采用RSA加密的话，移动APP保存公钥，服务器端保存私钥

import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.SecureRandom;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;import javax.crypto.Cipher;import org.apache.commons.codec.binary.Base64;/*** RSA加解密工具类* **/
public class RSAUtil {public static String publicKey; // 公钥public static String privateKey; // 私钥/*** 生成公钥和私钥*/public static void generateKey() {// 1.初始化秘钥
        KeyPairGenerator keyPairGenerator;try {keyPairGenerator = KeyPairGenerator.getInstance("RSA");SecureRandom sr = new SecureRandom(); // 随机数生成器keyPairGenerator.initialize(512, sr); // 设置512位长的秘钥KeyPair keyPair = keyPairGenerator.generateKeyPair(); // 开始创建RSAPublicKey rsaPublicKey = (RSAPublicKey) keyPair.getPublic();RSAPrivateKey rsaPrivateKey = (RSAPrivateKey) keyPair.getPrivate();// 进行转码publicKey = Base64.encodeBase64String(rsaPublicKey.getEncoded());// 进行转码privateKey = Base64.encodeBase64String(rsaPrivateKey.getEncoded());} catch (NoSuchAlgorithmException e) {// TODO Auto-generated catch block
            e.printStackTrace();}}/*** 私钥匙加密或解密* * @param content* @param privateKeyStr* @return*/public static String encryptByprivateKey(String content, String privateKeyStr, int opmode) {// 私钥要用PKCS8进行处理PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(Base64.decodeBase64(privateKeyStr));KeyFactory keyFactory;PrivateKey privateKey;Cipher cipher;byte[] result;String text = null;try {keyFactory = KeyFactory.getInstance("RSA");// 还原Key对象privateKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec);cipher = Cipher.getInstance("RSA");cipher.init(opmode, privateKey);if (opmode == Cipher.ENCRYPT_MODE) { // 加密result = cipher.doFinal(content.getBytes());text = Base64.encodeBase64String(result);} else if (opmode == Cipher.DECRYPT_MODE) { // 解密result = cipher.doFinal(Base64.decodeBase64(content));text = new String(result, "UTF-8");}} catch (Exception e) {// TODO Auto-generated catch block
            e.printStackTrace();}return text;}/*** 公钥匙加密或解密* * @param content* @param privateKeyStr* @return*/public static String encryptByPublicKey(String content, String publicKeyStr, int opmode) {// 公钥要用X509进行处理X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(Base64.decodeBase64(publicKeyStr));KeyFactory keyFactory;PublicKey publicKey;Cipher cipher;byte[] result;String text = null;try {keyFactory = KeyFactory.getInstance("RSA");// 还原Key对象publicKey = keyFactory.generatePublic(x509EncodedKeySpec);cipher = Cipher.getInstance("RSA");cipher.init(opmode, publicKey);if (opmode == Cipher.ENCRYPT_MODE) { // 加密result = cipher.doFinal(content.getBytes());text = Base64.encodeBase64String(result);} else if (opmode == Cipher.DECRYPT_MODE) { // 解密result = cipher.doFinal(Base64.decodeBase64(content));text = new String(result, "UTF-8");}} catch (Exception e) {// TODO Auto-generated catch block
            e.printStackTrace();}return text;}public static void main(String[] args) {// 1. 生成(公钥和私钥)密钥对
        RSAUtil.generateKey();System.out.println("公钥:" + RSAUtil.publicKey);System.out.println("私钥:" + RSAUtil.privateKey);System.out.println("----------公钥加密私钥解密-------------");// 使用 公钥加密,私钥解密String textsr = "irish";String encryptByPublic = RSAUtil.encryptByPublicKey(textsr, RSAUtil.publicKey, Cipher.ENCRYPT_MODE);System.out.println("公钥加密:" + encryptByPublic);String text = RSAUtil.encryptByprivateKey(encryptByPublic, RSAUtil.privateKey, Cipher.DECRYPT_MODE);System.out.print("私钥解密:" + text);}}