maven 引入一个依赖
<!-- https://mvnrepository.com/artifact/commons-codec/commons-codec -->
<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));
}
}