用Java写一个AES-CMAC加解密代码

好的，以下是一个Java实现的AES-CMAC加解密代码示例：

import javax.crypto.*;
import javax.crypto.spec.*;

public class AESCMAC {

    private SecretKey key;

    public AESCMAC(byte[] keyBytes) throws Exception {
        // 创建AES密钥
        key = new SecretKeySpec(keyBytes, "AES");
    }

    public byte[] encrypt(byte[] data) throws Exception {
        // 创建加密器
        Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
        cipher.init(Cipher.ENCRYPT_MODE, key);
        // 加密数据
        byte[] encrypted = cipher.doFinal(data);
        // 计算MAC
        byte[] mac = calculateCMAC(encrypted);
        // 拼接加密数据和MAC
        byte[] result = new byte[encrypted.length + mac.length];
        System.arraycopy(encrypted, 0, result, 0, encrypted.length);
        System.arraycopy(mac, 0, result, encrypted.length, mac.length);
        return result;
    }

    public byte[] decrypt(byte[] data) throws Exception {
        // 分离加密数据和MAC
        byte[] encrypted = new byte[data.length - 16];
        byte[] mac = new byte[16];
        System.arraycopy(data, 0, encrypted, 0, encrypted.length);
        System.arraycopy(data, encrypted.length, mac, 0, mac.length);
        // 计算MAC
        byte[] expectedMac = calculateCMAC(encrypted);
        // 验证MAC
        if (! MessageDigest.isEqual(mac, expectedMac)) {
            throw new Exception("Invalid MAC");
        }
        // 创建解密器
        Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
        cipher.init(Cipher.DECRYPT_MODE, key);
        // 解密数据
        return cipher.doFinal(encrypted);
    }

    private byte[] calculateCMAC(byte[] data) throws Exception {
        // 创建MAC计算器
        Mac mac = Mac.getInstance("AESCMAC");
        mac.init(key);
        // 计算MAC
        byte[] result = mac.doFinal(data);
        return result;
    }

}

使用示例：

// 创建AES-CMAC实例
byte[] keyBytes = new byte[] { 0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF, 0xFE, 0xDC, 0xBA, 0x98, 0x76, 0x54, 0x32, 0x10 };
AESCMAC aesCmac = new AESCMAC(keyBytes);

// 加密数据
byte[] data = "Hello, world!".getBytes("UTF-8");
byte[] encrypted = aesCmac.encrypt(data);
System.out.println("Encrypted: " + new String(encrypted, "UTF-8"));

// 解密数据
byte[] decrypted = aesCmac.decrypt(encrypted);
System.out.println("Decrypted: " + new String(decrypted, "UTF-8"));

注意：以上代码示例仅供参考，实际使用时需要根据具体需求进行修改和优化。