Java笔记-对称加密AES的使用

男娘i 2022-09-05 04:20 144阅读 0赞

AES加密库的使用：

·根据AES密钥创建Secret密钥向量；

·生成初始化参数向量；

·获取AES Cipher；

·执行加密；

·Base64编码（建议）

程序运行截图如下：

![20210817085337241.png][]

调用如下：

public static void main(String[] args) throws UnsupportedEncodingException {
    
        String content = "123456";
        AES aes = new AES();
        byte[] encrypted = aes.encrypt(content);
        System.out.println(new String(encrypted));
        ......
        ......
    }

AES.java

package cn.it1995.tool;
    
    import javax.crypto.*;
    import java.security.InvalidKeyException;
    import java.security.NoSuchAlgorithmException;
    import java.security.SecureRandom;
    
    //AES没有公钥和私钥之分
    public class AES {
    
        private SecretKey mKey;
    
        public AES(){
    
            try {
    
                KeyGenerator keyGenerator = KeyGenerator.getInstance("AES");
                //创建随机密码，并设置种子
                SecureRandom secureRandom = new SecureRandom();
                secureRandom.setSeed(System.currentTimeMillis());
    
                //初始化密钥对象
                keyGenerator.init(128, secureRandom);
                mKey = keyGenerator.generateKey();
            }
            catch (NoSuchAlgorithmException e) {
    
                e.printStackTrace();
            }
        }
    
        public byte[] encrypt(String content){
    
            if(mKey == null){
    
                return new byte[]{-1};
            }
    
            try {
    
                Cipher cipher = Cipher.getInstance("AES");
                cipher.init(Cipher.ENCRYPT_MODE, mKey);
                return cipher.doFinal(content.getBytes());
            }
            catch (NoSuchAlgorithmException e) {
    
                e.printStackTrace();
            }
            catch (NoSuchPaddingException e) {
    
                e.printStackTrace();
            }
            catch (BadPaddingException e) {
    
                e.printStackTrace();
            }
            catch (IllegalBlockSizeException e) {
    
                e.printStackTrace();
            }
            catch (InvalidKeyException e) {
    
                e.printStackTrace();
            }
    
            return new byte[]{-1};
        }
    
        public byte[] decrypt(byte[] content){
    
            if(mKey == null){
    
                return new byte[]{-1};
            }
    
            try {
    
                Cipher cipher = Cipher.getInstance("AES");
                cipher.init(Cipher.DECRYPT_MODE, mKey);
                return cipher.doFinal(content);
            }
            catch (NoSuchAlgorithmException e) {
    
                e.printStackTrace();
            }
            catch (NoSuchPaddingException e) {
    
                e.printStackTrace();
            }
            catch (BadPaddingException e) {
    
                e.printStackTrace();
            }
            catch (IllegalBlockSizeException e) {
    
                e.printStackTrace();
            }
            catch (InvalidKeyException e) {
    
                e.printStackTrace();
            }
    
            return new byte[]{-1};
        }
    }

[20210817085337241.png]: /images/20220829/7fb9c4ff40c84092945d51d191050fb1.png