Java使用AES算法

Java中使用AES（CBC，128位）算法加解密。一般加密后都是用一定编码格式进行传输，此处使用Base64算法进行编解码。实现及测试代码如下：

AESUtil.java

package gj.secure;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.security.Key;
import java.security.spec.AlgorithmParameterSpec;
import java.util.Base64;

public class AESUtil {
    private static final String CIPHER_ALGORITHM_CBC = "AES/CBC/PKCS5Padding";
    private static final String KEY_ALGORITHM = "AES";

    public static byte[] initKey() throws Exception {
        KeyGenerator kg = KeyGenerator.getInstance(KEY_ALGORITHM);
        kg.init(128);
        SecretKey secretKey = kg.generateKey();
        return secretKey.getEncoded();
    }

    public static byte[] encrypt(byte[] data, byte[] key, byte[] iv) throws Exception {
        Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM_CBC);
        Key k = new SecretKeySpec(key, KEY_ALGORITHM);
        AlgorithmParameterSpec paramSpec = new IvParameterSpec(iv);
        cipher.init(Cipher.ENCRYPT_MODE, k, paramSpec);
        return cipher.doFinal(data);
    }

    public static byte[] decrypt(byte[] bytes, byte[] key, byte[] iv) throws Exception {
        Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM_CBC);
        Key k = new SecretKeySpec(key, KEY_ALGORITHM);
        AlgorithmParameterSpec paramSpec = new IvParameterSpec(iv);
        cipher.init(Cipher.DECRYPT_MODE, k, paramSpec);
        return cipher.doFinal(bytes);
    }

    public static String encodeToBase64String(String data, byte[] key, byte[] iv) throws Exception {
        return Base64.getEncoder().encodeToString(encrypt(data.getBytes(), key, iv));
    }

    public static String decodeFromBase64String(String data, byte[] key, byte[] iv) throws Exception {
        byte[] bytes = Base64.getDecoder().decode(data);
        return new String(decrypt(bytes, key, iv));
    }
}

测试代码：

AESUtilTest.java

package gj.secure;

/**
 * created by gj on 2019-12-24 17:17
 **/
public class AESUtilTest {
    public static void main(String[] args) throws Exception {
        byte[] key = AESUtil.initKey();
        byte[] iv = {0x01, 0x23, 0x45, 0x67, 0x89 - 0xFF, 0xAB - 0xFF, 0xCD - 0xFF, 0xEF - 0xFF,
                0x01, 0x23, 0x45, 0x67, 0x89 - 0xFF, 0xAB - 0xFF, 0xCD - 0xFF, 0xEF - 0xFF};
        String content = "areful1997";
        String cipher = AESUtil.encodeToBase64String(content, key, iv);
        System.out.println(cipher);

        String plain = AESUtil.decodeFromBase64String(cipher, key, iv);
        System.out.println(plain);
    }
}