package com.whyc.util;
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import com.whyc.exception.CryptException;
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import javax.crypto.Cipher;
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import javax.crypto.SecretKey;
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import javax.crypto.spec.SecretKeySpec;
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import java.security.GeneralSecurityException;
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/**
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* AES对称加密
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*/
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public class AESUtil {
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public static void main(String[] args) {
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String test = aesEncrypt("2");
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String test2 = aesDecrypt(test);
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test2 = aesDecrypt("270A58CF479DC49985B5D06EC8D8C82A");
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System.out.println(test);
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System.out.println(test2);
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}
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private static String defaultKey = "www.whyctech.com";
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private static byte[] key = defaultKey.getBytes();
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public static String aesEncrypt(String input) {
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byte[] encryptResult = aesEncrypt(input.getBytes());
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return parseByte2HexStr(encryptResult);
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}
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private static byte[] aesEncrypt(byte[] bytes) {
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return aes(bytes, key, Cipher.ENCRYPT_MODE);
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}
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private static byte[] aes(byte[] bytes, byte[] key, int encryptMode) {
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try {
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SecretKey secretKey = new SecretKeySpec(key, "AES");
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Cipher cipher = Cipher.getInstance("AES");
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cipher.init(encryptMode, secretKey);
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return cipher.doFinal(bytes);
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} catch (GeneralSecurityException e) {
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throw new CryptException("加密异常", e);
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}
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}
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/*======解码======*/
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public static String aesDecrypt(String input) {
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byte[] bytes = parseHexStr2Byte(input);
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try {
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SecretKey secretKey = new SecretKeySpec(key, "AES");
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Cipher cipher = Cipher.getInstance("AES");
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cipher.init(Cipher.DECRYPT_MODE, secretKey);
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return new String(cipher.doFinal(bytes));
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} catch (GeneralSecurityException e) {
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throw new CryptException("解密异常", e);
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}
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}
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/**
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* 将二进制转换成16进制
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*
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* @param buf
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* @return
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*/
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private static String parseByte2HexStr(byte buf[]) {
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StringBuffer sb = new StringBuffer();
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for (int i = 0; i < buf.length; i++) {
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String hex = Integer.toHexString(buf[i] & 0xFF);
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if (hex.length() == 1) {
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hex = '0' + hex;
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}
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sb.append(hex.toUpperCase());
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}
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return sb.toString();
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}
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/**
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* 将16进制转换为二进制
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*
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* @param hexStr
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* @return
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*/
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private static byte[] parseHexStr2Byte(String hexStr) {
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if (hexStr.length() < 1)
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return null;
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byte[] result = new byte[hexStr.length() / 2];
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for (int i = 0; i < hexStr.length() / 2; i++) {
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int high = Integer.parseInt(hexStr.substring(i * 2, i * 2 + 1), 16);
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int low = Integer.parseInt(hexStr.substring(i * 2 + 1, i * 2 + 2), 16);
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result[i] = (byte) (high * 16 + low);
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}
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return result;
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}
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}
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