JAVA实现AES加密,解密

java提供了加解密工具,可以将字节转成加密字节.
因此在加解密前需要对内容进行转换.
一般情况我们希望以字符串的形式展示加密串
可以将byte[] 转换为base64字符串 也可以转换为16进制字符串
这里提供两个工具类
加密串为base64字符串
可以直接在数据库中进行解密,无需查到后再遍历解密

public class AESUtil {    // 加密    public static String Encrypt(String sclass="lazy" data-src, 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;        }        byte[] raw = sKey.getBytes("utf-8");        SecretKeySpec skeySpec = new SecretKeySpec(raw, "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(sclass="lazy" data-src.getBytes("utf-8"));        return new BASE64Encoder().encode(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 sclass="lazy" data-src, 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;            }            byte[] raw = sKey.getBytes("utf-8");            SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");            cipher.init(Cipher.DECRYPT_MODE, skeySpec);            byte[] encrypted1 = new BASE64Decoder().decodeBuffer(sclass="lazy" data-src);//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;        }    }    public static void main(String[] args) throws Exception {                String cKey = "jkl;POIU1234++==";        // 需要加密的字串        String cclass="lazy" data-src = "www.gowhere.so";        System.out.println(cclass="lazy" data-src);        // 加密        String enString = MyAESUtil.Encrypt(cclass="lazy" data-src, cKey);        System.out.println("加密后的字串是：" + enString);        // 解密        String DeString = MyAESUtil.Decrypt(enString, cKey);        System.out.println("解密后的字串是：" + DeString);    }}

加密串为16进制字符串

import org.slf4j.Logger;import org.slf4j.LoggerFactory;import javax.crypto.Cipher;import javax.crypto.spec.SecretKeySpec;public class MyAESUtil {    private static final Logger logger = LoggerFactory.getLogger(MyAESUtil.class);        public static String Encrypt(String sclass="lazy" data-src, String sKey) throws Exception {        if (sKey == null) {            logger.error("Key为空null");            return null;        }        // 判断Key是否为16位        if (sKey.length() != 16) {            logger.error("Key长度不是16位");            return null;        }        byte[] raw = sKey.getBytes("utf-8");        SecretKeySpec skeySpec = new SecretKeySpec(raw, "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(sclass="lazy" data-src.getBytes("utf-8"));        return encodeHexString(encrypted);    }        public static String encodeHexString(byte[] byteArray) {        StringBuffer hexStringBuffer = new StringBuffer();        for (int i = 0; i < byteArray.length; i++) {            hexStringBuffer.append(byteToHex(byteArray[i]));        }        return hexStringBuffer.toString();    }        public static String byteToHex(byte num) {        char[] hexDigits = new char[2];        hexDigits[0] = Character.forDigit((num >> 4) & 0xF, 16);        hexDigits[1] = Character.forDigit((num & 0xF), 16);        return new String(hexDigits);    }        public static String Decrypt(String sclass="lazy" data-src, String sKey)  {        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;            }            byte[] raw = sKey.getBytes("utf-8");            SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");            cipher.init(Cipher.DECRYPT_MODE, skeySpec);            byte[] encrypted1 =  parseHexStr2Byte(sclass="lazy" data-src); //new BASE64Decoder().decodeBuffer(sclass="lazy" data-src);//先用base64解密            try {                byte[] original = cipher.doFinal(encrypted1);                String originalString = new String(original,"utf-8");                return originalString;            } catch (Exception e) {                logger.error(e.toString());                return null;            }        } catch (Exception ex) {            logger.error(ex.toString());            return null;        }    }        public static byte[] parseHexStr2Byte(String hexStr) {        if (hexStr.length() < 1)            return null;        byte[] result = new byte[hexStr.length()/2];        for (int i = 0;i< hexStr.length()/2; i++) {            int high = Integer.parseInt(hexStr.substring(i*2, i*2+1), 16);            int low = Integer.parseInt(hexStr.substring(i*2+1, i*2+2), 16);            result[i] = (byte) (high * 16 + low);        }        return result;    }    // 测试    public static void main(String[] args)  {        try {            String key = "8ISIwyJodASysWTM";            String encrypt = MyAESUtil.Encrypt("123456", key); // 加密            System.out.println(encrypt);            String decrypt = MyAESUtil.Decrypt(encrypt, key); // 解密            System.out.println(decrypt);        }catch (Exception e){            e.printStackTrace();        }    }}

参考文章:https://blog.csdn.net/fuhanghang/article/details/124010261

来源地址：https://blog.csdn.net/Passer_hua/article/details/128827608