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package common.utils;
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import common.enumeration.errorMessageEnum.ErrorMessage;
import org.apache.commons.net.util.Base64;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* AES工具类
*
* 因为某些国家的进口管制限制，Java发布的运行环境包中的加解密有一定的限制。比如默认不允许256位密钥的AES加解密，解决方法就是修改策略文件。
* 替换的文件：%JDK_HOME%\jre\lib\security\local_policy.jar
* 参考： http://czj4451.iteye.com/blog/1986483
*/
public class AESUtil {
private static Logger log = LoggerFactory.getLogger(AESUtil.class);
// 密钥
public static String key = "AD42F6697B035B7580E4FEF93BE20BAD"; //长度必须为16、24、32位，即128bit、192bit、256bit
private static String charset = "utf-8";
// 偏移量
private static int offset = 16;
private static String transformation = "AES/CBC/PKCS5Padding";
private static String algorithm = "AES";
/**
* 加密
*
* @param content
* @return
*/
public static String encrypt(String content) {
return encrypt(content, key);
}
/**
* 解密
*
* @param content
* @return
*/
public static String decrypt(String content) {
return decrypt(content, key);
}
/**
* 加密
*
* @param content 需要加密的内容
* @param key 加密密码
* @return
*/
public static String encrypt(String content, String key) {
try {
SecretKeySpec skey = new SecretKeySpec(key.getBytes(), algorithm);
IvParameterSpec iv = new IvParameterSpec(key.getBytes(), 0, offset);
Cipher cipher = Cipher.getInstance(transformation);
byte[] byteContent = content.getBytes(charset);
cipher.init(Cipher.ENCRYPT_MODE, skey, iv);// 初始化
byte[] result = cipher.doFinal(byteContent);
return new Base64().encodeToString(result); // 加密
} catch (Exception e) {
log.error(ErrorMessage.ENCRYPTION_FAILED.getErrorInfo());
e.printStackTrace();
}
return null;
}
/**
* AES（256）解密
*
* @param content 待解密内容
* @param key 解密密钥
* @return 解密之后
* @throws Exception
*/
public static String decrypt(String content, String key) {
try {
SecretKeySpec skey = new SecretKeySpec(key.getBytes(), algorithm);
IvParameterSpec iv = new IvParameterSpec(key.getBytes(), 0, offset);
Cipher cipher = Cipher.getInstance(transformation);
cipher.init(Cipher.DECRYPT_MODE, skey, iv);// 初始化
byte[] result = cipher.doFinal(new Base64().decode(content));
return new String(result); // 解密
} catch (Exception e) {
log.error(ErrorMessage.DECRYPTION_FAILED.getErrorInfo());
e.printStackTrace();
}
return null;
}
}