package com.dsh.guns.modular.system.util;
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import javax.crypto.Cipher;
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import javax.crypto.spec.IvParameterSpec;
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import javax.crypto.spec.SecretKeySpec;
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import java.security.Key;
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import java.security.spec.AlgorithmParameterSpec;
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import java.util.Base64;
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public class AESUtils {
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private static final String TRANSFORMATION = "AES/CBC/PKCS5Padding";
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private static final String ALGORITHM = "AES";
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private static final String CHARSET = "utf-8";
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/**
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* 建议为16位或32位
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*/
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private static final String KEY = "c53fd327353a09a1";
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/**
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* 必须16位
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* 初始化向量IV不可以为32位，否则异常java.security.InvalidAlgorithmParameterException: Wrong IV length: must be 16 bytes long
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*/
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private static final String IV = "3a0565e3b1d8ae3d";
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/**
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* 加密
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*
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* @param context
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* @return
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*/
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public static String encrypt(String context) {
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try {
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byte[] decode = context.getBytes(CHARSET);
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byte[] bytes = createKeyAndIv(decode, Cipher.ENCRYPT_MODE);
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return Base64.getEncoder().encodeToString(bytes);
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} catch (Exception e) {
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e.printStackTrace();
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}
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return null;
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}
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/**
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* 解密
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*
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* @param context
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* @return
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*/
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public static String decrypt(String context) {
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try {
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Base64.Decoder decoder = Base64.getDecoder();
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byte[] decode = decoder.decode(context);
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byte[] bytes = createKeyAndIv(decode, Cipher.DECRYPT_MODE);
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return new String(bytes, CHARSET);
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} catch (Exception e) {
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e.printStackTrace();
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}
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return null;
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}
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/**
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* 获取key & iv
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*
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* @param context
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* @param opmode
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* @return
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* @throws Exception
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*/
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public static byte[] createKeyAndIv(byte[] context, int opmode) throws Exception {
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byte[] key = KEY.getBytes(CHARSET);
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byte[] iv = IV.getBytes(CHARSET);
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return cipherFilter(context, opmode, key, iv);
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}
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/**
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* 执行操作
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*
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* @param context
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* @param opmode
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* @param key
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* @param iv
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* @return
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* @throws Exception
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*/
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public static byte[] cipherFilter(byte[] context, int opmode, byte[] key, byte[] iv) throws Exception {
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Key secretKeySpec = new SecretKeySpec(key, ALGORITHM);
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AlgorithmParameterSpec ivParameterSpec = new IvParameterSpec(iv);
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Cipher cipher = Cipher.getInstance(TRANSFORMATION);
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cipher.init(opmode, secretKeySpec, ivParameterSpec);
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return cipher.doFinal(context);
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}
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}
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