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Copy pathAESUtil.java
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executable file
·176 lines (146 loc) · 3.61 KB
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package array;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
public class AESUtil {
private static final String AES = "AES";
private static final String CHARSET_NAME = "utf-8";
/**
* 获取密钥
*
* @param password
* 加密密码
* @return
* @throws NoSuchAlgorithmException
*/
private static SecretKeySpec getKey(String password)
throws NoSuchAlgorithmException {
// 密钥加密器生成器
KeyGenerator kgen = KeyGenerator.getInstance(AES);
kgen.init(128, new SecureRandom(password.getBytes()));
// 创建加密器
SecretKey secretKey = kgen.generateKey();
byte[] enCodeFormat = secretKey.getEncoded();
SecretKeySpec key = new SecretKeySpec(enCodeFormat, AES);
return key;
}
/**
* 加密
*
* @param str
* 原文
* @param password
* 加密密码
* @return
*/
public static String encode(String str, String password) {
byte[] arr = encodeToArr(str, password);
return byteArrToString(arr);
}
/**
*
* 加密
*
* @author wuhongbo
* @param str
* 原文
* @param password
* 加密密码
* @return
*/
private static byte[] encodeToArr(String str, String password) {
try {
Cipher cipher = Cipher.getInstance(AES);// 创建密码器
byte[] byteContent = str.getBytes(CHARSET_NAME);
cipher.init(Cipher.ENCRYPT_MODE, getKey(password));// 初始化
byte[] result = cipher.doFinal(byteContent);
return result;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/**
* 解密
*
* @param hexStr
* 密文
* @param password
* 加密密码
* @return
*/
public static String decode(String hexStr, String password) {
byte[] arr = string2ByteArr(hexStr);
return decode(arr, password);
}
/**
* 解密
*
* @author wuhongbo
* @param arr
* 密文数组
* @param password
* 加密密码
* @return
*/
private static String decode(byte[] arr, String password) {
try {
// 创建密码器
Cipher cipher = Cipher.getInstance(AES);
cipher.init(Cipher.DECRYPT_MODE, getKey(password));// 初始化
byte[] result = cipher.doFinal(arr);
return new String(result, CHARSET_NAME);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/**
* byte数组转成16进制字符串
*
* @param arr
* @return
*/
private static String byteArrToString(byte[] arr) {
StringBuffer sb = new StringBuffer();
for (int i = 0; i < arr.length; i++) {
String s = Integer.toString(arr[i] + 128, 16);
if (s.length() == 1) {
s = "0" + s;
}
sb.append(s);
}
return sb.toString().toUpperCase();
}
/**
* 16进制字符串转成byte数组
*
* @param arr
* @return
*/
private static byte[] string2ByteArr(String s) {
s = s.toUpperCase();
String str = "0123456789ABCDEF";
byte[] arr = new byte[s.length() / 2];
for (int i = 0; i < arr.length; i++) {
char s1 = s.charAt(i * 2);
char s2 = s.charAt(i * 2 + 1);
int tmp1 = str.indexOf(s1) * 16;
int tmp2 = str.indexOf(s2);
arr[i] = (byte) (tmp1 + tmp2 - 128);
}
return arr;
}
public static void main(String[] args) {
String password = "yahier";
String content = "123456";
System.out.println("原文：" + content);
String hexStr = encode(content, password);
System.out.println("密文长度：" + hexStr.length());
System.out.println("密文：" + hexStr);
System.out.println("解密：" + decode(hexStr, password));
}
}