用MVC模式进行后端管理员RSA加密登录具体代码实现

这里提供一个示例代码实现，使用Java语言和Spring框架：

1. Model层

管理员信息模型类Admin：

public class Admin {
    private Integer id;
    private String username;
    private String password;

    // 省略getter和setter方法...
}

2. View层

管理员登录的控制器AdminLoginController：

@Controller
@RequestMapping("/admin")
public class AdminLoginController {

    @Autowired
    private AdminService adminService;

    @GetMapping("/login")
    public String loginPage() {
        return "admin/login";
    }

    @PostMapping("/login")
    @ResponseBody
    public ResultVO login(@RequestParam("username") String username,
                          @RequestParam("password") String password,
                          HttpSession session) {
        Admin admin = adminService.findByUsername(username);
        if (admin == null) {
            return ResultVO.fail("用户名不存在！");
        }

        // 对密码进行RSA加密
        String encryptedPassword = RSAUtil.encrypt(password, admin.getPublicKey());
        if (!admin.getPassword().equals(encryptedPassword)) {
            return ResultVO.fail("密码错误！");
        }

        // 登录成功，将管理员信息存入Session
        session.setAttribute("admin", admin);
        return ResultVO.success();
    }
}

3. Controller层

管理员业务逻辑的服务类AdminService（核心代码是获取RSA公钥并保存到数据库中）：

@Service
public class AdminService {

    @Autowired
    private AdminMapper adminMapper;

    @Autowired
    private RSAUtil rsaUtil;

    public Admin findByUsername(String username) {
        Admin admin = adminMapper.findByUsername(username);
        if (admin != null && admin.getPublicKey() == null) {
            // 如果RSA公钥不存在，则生成新的公钥并保存到数据库中
            Map<String, Object> keyMap = rsaUtil.genKeyPair();
            String publicKey = rsaUtil.getPublicKey(keyMap);
            admin.setPublicKey(publicKey);
            adminMapper.updatePublicKeyById(admin.getId(), publicKey);
        }
        return admin;
    }
}

4. 工具类

RSA加密算法的工具类RSAUtil（使用了Bouncy Castle库）：

@Component
public class RSAUtil {

    // 生成RSA密钥对
    public Map<String, Object> genKeyPair() {
        try {
            Security.addProvider(new BouncyCastleProvider());

            KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance("RSA", "BC");
            keyPairGen.initialize(1024, new SecureRandom());

            KeyPair keyPair = keyPairGen.generateKeyPair();
            PrivateKey privateKey = keyPair.getPrivate();
            PublicKey publicKey = keyPair.getPublic();

            Map<String, Object> keyMap = new HashMap<>();
            keyMap.put("private", privateKey);
            keyMap.put("public", publicKey);
            return keyMap;
        } catch (Exception e) {
            throw new RuntimeException("RSA密钥生成失败！", e);
        }
    }

    // 获取RSA公钥字符串
    public String getPublicKey(Map<String, Object> keyMap) {
        try {
            PublicKey publicKey = (PublicKey) keyMap.get("public");
            return Base64.getEncoder().encodeToString(publicKey.getEncoded());
        } catch (Exception e) {
            throw new RuntimeException("RSA公钥获取失败！", e);
        }
    }

    // RSA加密
    public String encrypt(String plaintext, String publicKeyStr) {
        try {
            Security.addProvider(new BouncyCastleProvider());

            byte[] publicKeyBytes = Base64.getDecoder().decode(publicKeyStr);
            X509EncodedKeySpec keySpec = new X509EncodedKeySpec(publicKeyBytes);

            KeyFactory keyFactory = KeyFactory.getInstance("RSA", "BC");
            PublicKey publicKey = keyFactory.generatePublic(keySpec);

            Cipher cipher = Cipher.getInstance("RSA/None/PKCS1Padding", "BC");
            cipher.init(Cipher.ENCRYPT_MODE, publicKey);

            byte[] ciphertextBytes = cipher.doFinal(plaintext.getBytes());
            return Base64.getEncoder().encodeToString(ciphertextBytes);
        } catch (Exception e) {
            throw new RuntimeException("RSA加密失败！", e);
        }
    }
}

以上是使用MVC模式进行后端管理员RSA加密登录的具体代码实现，仅供参考。