[java]java使用AES加密解密 ，AES-128/192/256-ECB加密模式

import org.apache.commons.codec.binary.Base64;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import java.security.SecureRandom;
import java.text.SimpleDateFormat;
import java.util.Date;

@RunWith(SpringRunner.class)
@SpringBootTest
public class RestapiApplicationTests {

// 加密
public static String Encrypt(String sSrc, String sKey) throws Exception {
if (sKey == null) {
System.out.print("Key为空null");
return null;
}
// 判断Key是否为16位
if (sKey.length() != 16) {
System.out.print("Key长度不是16位");
return null;
}
KeyGenerator kgen = KeyGenerator.getInstance("AES");
kgen.init(128, new SecureRandom(sKey.getBytes()));
SecretKey secretKey = kgen.generateKey();
byte[] enCodeFormat = secretKey.getEncoded();
SecretKeySpec skeySpec = new SecretKeySpec(enCodeFormat , "AES");

Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");//"算法/模式/补码方式"
cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
byte[] encrypted = cipher.doFinal(sSrc.getBytes("utf-8"));

return new Base64().encodeToString(encrypted);//此处使用BASE64做转码功能，同时能起到2次加密的作用。
}

// 解密
public static String Decrypt(String sSrc, String sKey) throws Exception {
try {
// 判断Key是否正确
if (sKey == null) {
System.out.print("Key为空null");
return null;
}
// 判断Key是否为16位
if (sKey.length() != 16) {
System.out.print("Key长度不是16位");
return null;
}
KeyGenerator kgen = KeyGenerator.getInstance("AES");
kgen.init(128, new SecureRandom(sKey.getBytes()));
SecretKey secretKey = kgen.generateKey();
byte[] enCodeFormat = secretKey.getEncoded();
SecretKeySpec skeySpec = new SecretKeySpec(enCodeFormat , "AES");

Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE, skeySpec);
byte[] encrypted1 = new Base64().decode(sSrc);//先用base64解密
try {
byte[] original = cipher.doFinal(encrypted1);
String originalString = new String(original,"utf-8");
return originalString;
} catch (Exception e) {
System.out.println(e.toString());
return null;
}
} catch (Exception ex) {
System.out.println(ex.toString());
return null;
}
}

@Test
public void test() throws Exception {
/*
* 此处使用AES-128-ECB加密模式，key需要为16位。
*/
String cKey = "1234567890123456";
// 需要加密的字串
String cSrc = "hello";
System.out.println(cSrc);
// 加密
String enString = RestapiApplicationTests.Encrypt(cSrc, cKey);
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyyMMdd HH:mm:ss");
System.out.println("时间：" + simpleDateFormat.format(new Date()) + "加密后的字串是：" + enString);
// 解密
String DeString = RestapiApplicationTests.Decrypt(enString, cKey);
System.out.println("时间：" + simpleDateFormat.format(new Date()) + "解密后的字串是：" + DeString);
}
}