Java AES 加密解密工具类

墨蓝 2022-02-19 00:07 411阅读 0赞

**maven 引入一个依赖**

<dependency>
        <groupId>commons-codec</groupId>
        <artifactId>commons-codec</artifactId>
        <version>1.11</version>
    </dependency>

### 一、Java AES 加密解密工具类 ###

import java.util.Random;
    import java.util.UUID;
    
    import javax.crypto.Cipher;
    import javax.crypto.spec.IvParameterSpec;
    import javax.crypto.spec.SecretKeySpec;
    
    import org.apache.commons.codec.binary.Base64;
    
    /**
     * AES 128bit 加密解密工具类
     */
    public class AesEncryptUtil {
    	//使用AES-128-CBC加密模式，key需要为16位,key和iv可以相同！
    	
    	/**
    	 * 加密方法
    	 * @param data  要加密的数据
    	 * @param key 加密key
    	 * @param iv 加密iv
    	 * @return 加密的结果
    	 * @throws Exception
    	 */
    	public static String encrypt(String data, String key, String iv) throws Exception {
    		try {
    
    			Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");//"算法/模式/补码方式"
    			int blockSize = cipher.getBlockSize();
    
    			byte[] dataBytes = data.getBytes();
    			int plaintextLength = dataBytes.length;
    			if (plaintextLength % blockSize != 0) {
    				plaintextLength = plaintextLength + (blockSize - (plaintextLength % blockSize));
    			}
    
    			byte[] plaintext = new byte[plaintextLength];
    			System.arraycopy(dataBytes, 0, plaintext, 0, dataBytes.length);
    
    			SecretKeySpec keyspec = new SecretKeySpec(key.getBytes(), "AES");
    			IvParameterSpec ivspec = new IvParameterSpec(iv.getBytes());
    
    			cipher.init(Cipher.ENCRYPT_MODE, keyspec, ivspec);
    			byte[] encrypted = cipher.doFinal(plaintext);	// 加密
    
    			return new Base64().encodeToString(encrypted); 	//通过Base64转码返回
    
    		} catch (Exception e) {
    			e.printStackTrace();
    			return null;
    		}
    	}
    
    	/**
    	 * 解密方法
    	 * @param data 要解密的数据
    	 * @param key  解密key
    	 * @param iv 解密iv
    	 * @return 解密的结果
    	 * @throws Exception
    	 */
    	public static String desEncrypt(String data, String key, String iv) throws Exception {
    		try {
    			byte[] encrypted1 = new Base64().decode(data);
    
    			Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
    			SecretKeySpec keyspec = new SecretKeySpec(key.getBytes(), "AES");
    			IvParameterSpec ivspec = new IvParameterSpec(iv.getBytes());
    
    			cipher.init(Cipher.DECRYPT_MODE, keyspec, ivspec); //使用密钥初始化，设置为解密模式
    
    			byte[] original = cipher.doFinal(encrypted1);	//执行操作
    			String originalString = new String(original);
    			return originalString;
    		} catch (Exception e) {
    			e.printStackTrace();
    			return null;
    		}
    	}
    	
    	/**
    	  *   用于生成一组16位随机数 key
    	 * @return
    	 */
    	public static String getRandomStringKey() {
    		int hashCodeValue = UUID.randomUUID().hashCode();
    		if(hashCodeValue < 0) hashCodeValue = -hashCodeValue;
    		return String.format("%016d",hashCodeValue);//左边补0,16位，进制（d,x）
    	}
    	
    	/**
    	  *   用于生成16位的随机数 iv
    	 * @return
    	 */
        public static String getRandomStringIv(){
    		String base = "abcdefghijklmnopqrstuvwxyz0123456789";   
    		Random random=new Random();
    		StringBuffer key = new StringBuffer();
    		for(int i=0;i<16;i++){ 
    			int keyNumber = random.nextInt(base.length());   
    			key.append(base.charAt(keyNumber));
    		}  
    		return key.toString();
    	}
    	
    	
    	/**
    	* 测试
    	*/
    	public static void main(String args[]) throws Exception {
    		String data = "admin123";
    		String key = getRandomStringKey();
    		String iv = getRandomStringIv();
    
    		String enData = encrypt(data, key, iv);
    
    		System.out.println(key);
    		System.out.println(iv);
    		System.out.println(enData);
    		System.out.println(desEncrypt(enData, key, iv));
    	}
    }

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[20190415105045497.png]: /images/20220219/862a9a938e5145cdb5d4447d27e13ef8.png