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package com.yiboshi.science.utils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.commons.codec.binary.Base64;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.util.logging.Level;
public class AesHelper {
protected static Logger logger = LoggerFactory.getLogger(AesHelper.class);
private static final String key = "kYgzNIfb&95GUY86";
// 加密
public static String encrypt(String data) {
try {
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding"); //"算法/模式/补码方式"
byte[] raw = key.getBytes("utf-8");
SecretKeySpec keySpec = new SecretKeySpec(raw, "AES");
cipher.init(Cipher.ENCRYPT_MODE, getSecretKey(key));
byte[] encrypted = cipher.doFinal(data.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。
} catch (Exception ex) {
System.out.println(ex.toString());
return null;
}
}
// 解密
public static String decrypt(String data) {
try {
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
byte[] raw = key.getBytes("utf-8");
SecretKeySpec keySpec = new SecretKeySpec(raw, "AES");
cipher.init(Cipher.DECRYPT_MODE, getSecretKey(key));
byte[] encrypted1 = new BASE64Decoder().decodeBuffer(data);//先用base64解密
byte[] original = cipher.doFinal(encrypted1);
String originalString = new String(original, "utf-8");
return originalString;
} catch (Exception ex) {
System.out.println(ex.toString());
return null;
}
}
/**
* 生成加密秘钥
*
* @return
*/
private static SecretKeySpec getSecretKey(final String key) {
//返回生成指定算法密钥生成器的 KeyGenerator 对象
KeyGenerator kg = null;
try {
kg = KeyGenerator.getInstance("AES");
//AES 要求密钥长度为 128
kg.init(128, new SecureRandom(key.getBytes()));
//生成一个密钥
SecretKey secretKey = kg.generateKey();
return new SecretKeySpec(secretKey.getEncoded(), "AES");// 转换为AES专用密钥
} catch (NoSuchAlgorithmException ex) {
System.out.println(ex.toString());
}
return null;
}
}