自定义的一个对称加密工具类AESUtil.java
public static final String ENCRYPTION_ALGORITHM = "AES";
public static final String CIPHER_PARAM = "AES/CBC/PKCS5Padding";
private static final String DEFAULT_KEY_AND_IV = "1234567890ABCDEF";//带偏移量的密钥和偏移量似乎是固定16位长度的
private static AESUtil instance = null; /** 偏移量 **/
private static IvParameterSpec iv;
/** 密钥 **/
private static SecretKeySpec key; /**
* @Title: getInstance
* @Description: 单例AES加密工具，使用默认的密钥以及偏移量
* @return AESUtil
* @author hanzhiyong
* @date 2019-4-26下午4:51:12
*/
public static AESUtil getInstance() {
if (instance == null) {
instance = new AESUtil(DEFAULT_KEY_AND_IV);
}
return instance;
}
/**
* @Title:AESUtil
* @Description:自定义偏移量构造AES加密工具，使用默认的KEY
* @param ivParameter 原始偏移量字符串
*/
public AESUtil(String ivParameter) {
iv = new IvParameterSpec(ivParameter.getBytes());
key = new SecretKeySpec(DEFAULT_KEY_AND_IV.getBytes(), ENCRYPTION_ALGORITHM);
} /**
* @Title:AESUtil
* @Description:自定义偏移量和密钥构造AES加密工具
* @param secretKey 原始密钥字符串
* @param ivParameter 原始偏移量字符串
*/
public AESUtil(String secretKey, String ivParameter) {
iv = new IvParameterSpec(ivParameter.getBytes());
key = new SecretKeySpec(secretKey.getBytes(), ENCRYPTION_ALGORITHM);
} /**
* 取得密钥
*
* @throws Exception
*/
public static String getKey() {
Base64 base64 = new Base64();
System.out.println("密钥String:" + new String(key.getEncoded()));
return base64.encodeToString(key.getEncoded());
} /**
* 取得偏移量
*/
public static String getIv() throws Exception {
Base64 base64 = new Base64();
System.out.println("偏移量String:" + new String(iv.getIV()));
return base64.encodeToString(iv.getIV());
}
/**
* @Title: encrypt
* @Description: AES加密
* @param enString 用来加密的明文
* @throws Exception
* @return String 加密后密文
* @author hanzhiyong
* @date 2019-4-26下午3:57:17
*/
public String encrypt(String enString) throws Exception {
Base64 base64 = new Base64();
Cipher cipher = Cipher.getInstance(CIPHER_PARAM);
cipher.init(Cipher.ENCRYPT_MODE, key, iv);
byte[] encrypted = cipher.doFinal(enString.getBytes("utf-8"));
return base64.encodeToString(encrypted); }
/**
* @Title: decrypt
* @Description: AES解密
* @param deString 用来解密的密文
* @throws Exception
* @return String 解密后的明文
* @author hanzhiyong
* @date 2019-4-26下午3:58:06
*/
public String decrypt(String deString) throws Exception {
try {
Base64 base64 = new Base64();
Cipher cipher = Cipher.getInstance(CIPHER_PARAM);
cipher.init(Cipher.DECRYPT_MODE, key, iv);
byte[] decrypted = base64.decode(deString);
byte[] original = cipher.doFinal(decrypted);
return new String(original, "utf-8");
} catch (Exception ex) {
return null;
}
} /**
* @Title: main
* @Description: 加密解密测试用例
* @param args
* @throws Exception
* @return void
* @author hanzhiyong
* @date 2019-4-23下午6:41:16
*/
@Deprecated
public static void main(String args[]) throws Exception {
String sourceString = "测试用来加密的数据";
System.out.println("sourceString加密前: " + sourceString); System.out.println("=========================单例的加密工具=========================");
System.out.println("base64加密后密钥:" + AESUtil.getInstance().getKey());
System.out.println("base64加密后偏移量:" + AESUtil.getInstance().getIv());
System.out.println("加密后sourceString: " + AESUtil.getInstance().encrypt(sourceString));
System.out.println("解密后sourceString: " + AESUtil.getInstance().decrypt(AESUtil.getInstance().encrypt(sourceString))); AESUtil aesUtil = new AESUtil("0123456789111111");
System.out.println("=========================自定义偏移量的工具=========================");
System.out.println("base64加密后密钥：" + aesUtil.getKey());
System.out.println("base64加密后偏移量：" + aesUtil.getIv());
System.out.println("加密后sourceString: " + aesUtil.encrypt(sourceString));
System.out.println("解密后sourceString: " + aesUtil.decrypt(aesUtil.encrypt(sourceString))); }