在Java中使用AES加密，并且加密的Key长度在16位以上

朱雀 2021-09-16 09:20 410阅读 0赞

[https://blog.csdn.net/u010513756/article/details/79017014][https_blog.csdn.net_u010513756_article_details_79017014]

> 代码示例来源，感谢[http://www.cnblogs.com/jys509/p/4768120.html\#autoid-0-1-0][http_www.cnblogs.com_jys509_p_4768120.html_autoid-0-1-0]

import javax.crypto.Cipher;
    import javax.crypto.spec.IvParameterSpec;
    import javax.crypto.spec.SecretKeySpec;
    
    import sun.misc.BASE64Decoder;
    import sun.misc.BASE64Encoder;
    
    
    /**
     * AES 是一种可逆加密算法，对用户的敏感信息加密处理 对原始数据进行AES加密后，在进行Base64编码转化；
     */
    public class AESOperator {
    
        /*
         * 加密用的Key 可以用26个字母和数字组成 此处使用AES-128-CBC加密模式，key需要为16位。
         */
        private String sKey = "smkldospdosldaaa";//key，可自行修改
        private String ivParameter = "0392039203920300";//偏移量,可自行修改
        private static AESOperator instance = null;
    
        private AESOperator() {
    
        }
    
        public static AESOperator getInstance() {
            if (instance == null)
                instance = new AESOperator();
            return instance;
        }
    
    public static String Encrypt(String encData ,String secretKey,String vector) throws Exception {
    
            if(secretKey == null) {
                return null;
            }
            if(secretKey.length() != 16) {
                return null;
            }
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
            byte[] raw = secretKey.getBytes();
            SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
            IvParameterSpec iv = new IvParameterSpec(vector.getBytes());// 使用CBC模式，需要一个向量iv，可增加加密算法的强度
            cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
            byte[] encrypted = cipher.doFinal(encData.getBytes("utf-8"));
            return new BASE64Encoder().encode(encrypted);// 此处使用BASE64做转码。
        }
    
    
        // 加密
        public String encrypt(String sSrc) throws Exception {
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
            byte[] raw = sKey.getBytes();
            SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
            IvParameterSpec iv = new IvParameterSpec(ivParameter.getBytes());// 使用CBC模式，需要一个向量iv，可增加加密算法的强度
            cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
            byte[] encrypted = cipher.doFinal(sSrc.getBytes("utf-8"));
            return new BASE64Encoder().encode(encrypted);// 此处使用BASE64做转码。
        }
    
        // 解密
        public String decrypt(String sSrc) throws Exception {
            try {
                byte[] raw = sKey.getBytes("ASCII");
                SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
                Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
                IvParameterSpec iv = new IvParameterSpec(ivParameter.getBytes());
                cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
                byte[] encrypted1 = new BASE64Decoder().decodeBuffer(sSrc);// 先用base64解密
                byte[] original = cipher.doFinal(encrypted1);
                String originalString = new String(original, "utf-8");
                return originalString;
            } catch (Exception ex) {
                return null;
            }
        }
    
        public String decrypt(String sSrc,String key,String ivs) throws Exception {
            try {
                byte[] raw = key.getBytes("ASCII");
                SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
                Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
                IvParameterSpec iv = new IvParameterSpec(ivs.getBytes());
                cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
                byte[] encrypted1 = new BASE64Decoder().decodeBuffer(sSrc);// 先用base64解密
                byte[] original = cipher.doFinal(encrypted1);
                String originalString = new String(original, "utf-8");
                return originalString;
            } catch (Exception ex) {
                return null;
            }
        }
    
        public static String encodeBytes(byte[] bytes) {
            StringBuffer strBuf = new StringBuffer();
    
            for (int i = 0; i < bytes.length; i++) {
                strBuf.append((char) (((bytes[i] >> 4) & 0xF) + ((int) 'a')));
                strBuf.append((char) (((bytes[i]) & 0xF) + ((int) 'a')));
            }
    
            return strBuf.toString();
        }
    
        public static void main(String[] args) throws Exception {
            // 需要加密的字串
            String cSrc = "[{\"request_no\":\"1001\",\"service_code\":\"FS0001\",\"contract_id\":\"100002\",\"order_id\":\"0\",\"phone_id\":\"13913996922\",\"plat_offer_id\":\"100094\",\"channel_id\":\"1\",\"activity_id\":\"100045\"}]";
    
            // 加密
            long lStart = System.currentTimeMillis();
            String enString = AESOperator.getInstance().encrypt(cSrc);
            System.out.println("加密后的字串是：" + enString);
    
            long lUseTime = System.currentTimeMillis() - lStart;
            System.out.println("加密耗时：" + lUseTime + "毫秒");
            // 解密
            lStart = System.currentTimeMillis();
            String DeString = AESOperator.getInstance().decrypt(enString);
            System.out.println("解密后的字串是：" + DeString);
            lUseTime = System.currentTimeMillis() - lStart;
            System.out.println("解密耗时：" + lUseTime + "毫秒");
        }
    
    }

此处加密的key是`smkldospdosldaaa`，如果修改为32位或者更高位的的将会报java.security.InvalidKeyException: Illegal key size   
解决办法：   
下载对应的jar文件替换原有的，   
jdk1.8的[http://www.oracle.com/technetwork/java/javase/downloads/jce8-download-2133166.html][http_www.oracle.com_technetwork_java_javase_downloads_jce8-download-2133166.html]。   
其他版本的与之类似，下载好后解压，主要用到local\_policy.jar和US\_export\_policy.jar，将其复制到JAVA\_HOME下的\\jre\\lib\\security中替换，即可   
我是用在即构娃娃机上的，他需要将一串json用AES加密   
![SouthEast][]

[https_blog.csdn.net_u010513756_article_details_79017014]: https://blog.csdn.net/u010513756/article/details/79017014
[http_www.cnblogs.com_jys509_p_4768120.html_autoid-0-1-0]: http://www.cnblogs.com/jys509/p/4768120.html#autoid-0-1-0
[http_www.oracle.com_technetwork_java_javase_downloads_jce8-download-2133166.html]: http://www.oracle.com/technetwork/java/javase/downloads/jce8-download-2133166.html
[SouthEast]: /images/20210527/cff23772cd334ca2852a47f6e6c34068.png