移动APP接口安全性设计

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);
    }
}

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);
    }

}